GOST 28343-89
(ISO 7121-86)
Group G18
INTERSTATE STANDARD
FLANGED STEEL BALL VALVES
Technical requirements
Flanged steel ball valves. Technical requirements
ISS 23.060.20
OKP 37 0000
Date of introduction 1992-01-01
INFORMATION DATA
1. INTRODUCED by the Intersectoral State Association "Energomash"
2. By Decree of the USSR State Committee for Standards dated November 22, 1989 N 3423, the USSR state standard GOST 28343-89 was put into effect, as which the international standard ISO 7121-86 was applied, from 01/01/92
3. Inspection period - 1995, inspection frequency - 5 years
4. INTRODUCED FOR THE FIRST TIME
5. REISSUE
1 AREA OF USE
1 AREA OF USE
This standard applies to steel flanged ball valves for nominal pressure from 1 to 10 MPa (10 to 100 kgf/cm) and nominal bore from 10 to 500 mm, intended for new design.
2. LINKS
Reference documents are given in Appendix 1.
3. DEFINITIONS
This standard uses the definitions given in ISO 6708 and ISO 7268, as well as the following definitions:
3.1. Construction length - the distance between two planes perpendicular to the axis of the body and located at the ends of the body.
3.2. Antistatic design - a design that ensures continuous electrical conductivity between the body, ball and valve stem.
3.3. Rod with pull-out protection - a design that prevents the rod from being pulled out of the body in the event of changing the stuffing box without relieving the pressure in the system.
3.4. Effective diameter is the specified minimum diameter of the valve's flow area when the valve is in the fully open position.
4. MODELS
The cranes have “full” or “reduced” passages (see Figure 1) and face-to-face dimensions that comply with the requirements of ISO 5752.
Damn.1. Models
Models
Note. In some types of valves produced in large series for nominal pressure 10 and small series for nominal pressure 16 and 20, the ball (plug) (in a fully or partially closed position) may protrude beyond the edges of the flange surfaces.
5. CONDITIONAL PASSAGE
Conditional passage () is selected from the range: 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500.
6. RANGE OF CONDITIONAL PRESSURES
Conditional pressure is selected from the range: 10, 16, 20, 25, 40, 50, 100.
7. PRESSURE AND TEMPERATURE RELATIONSHIP
The permissible pressure-temperature ratios for housings given in the corresponding tables of ISO 7005-1 are not limited depending on the material of the seals. The limits of these ratios are set by the manufacturer of the fittings and are indicated during marking (see clause 12.3).
8. CONSTRUCTION
Typical designs of ball valves with optimal locations of taps are shown in Figure 2.
Damn.2. Typical designs of ball valves with optimal outlet location
Typical designs of ball valves with optimal outlet location
Ball type
1 - possible location of the outlet; 2 - the ends of the axle can be pinned,
coupling or both
Type of shell
The structural elements of the crane are shown in Figure 3.
Damn.3. Terminology
Terminology
1 - connecting flange; 2 - diameter of the body through hole; 3 - body neck;
4 - neck flange; 5 - effective diameter; 6 - body; 7 - construction length
8.1.
Frame
8.1.1. General provisions. The body can be solid or split. In a split housing, the design strength of the connection point must correspond to the strength of the housing connecting flange.
By agreement with the customer, special measures may be provided to protect the housing cavity from excess pressure.
8.1.2. Thickness of the housing walls (see drawing 4)
Damn.4. Wall thickness
Wall thickness
8.1.2.1. The minimum wall thickness during manufacture () is indicated in Table 1, with the exception of cases according to clauses 8.1.2.2 and 8.1.2.3.
Table 1
Housing wall thickness
Conditional pass | Minimum thickness, mm, at nominal pressure, kgf/cm |
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It is allowed to increase the thickness of metal walls if it is necessary to take into account, for example, assembly stresses, efforts to close the valve, non-ring-shaped cutouts and stress concentrates.
8.1.2.2. The minimum wall thickness (clause 8.1.2.1) falls on the neck of the housing at a place distant from the outer surface of the housing, and is measured from the internal surfaces, where is the internal diameter, as defined in clause 8.1.3.4.
Outside the distance, the neck section of the annular section with an internal diameter must have a thickness of at least , this value can be determined by interpolating the value corresponding to the value equal to the conditional pressure.
If, then the minimum thickness of the neck wall will be greater than the base one, and this thickness should be throughout the entire section of the neck with a diameter
8.1.2.3. In some areas, wall thicknesses below the minimum value are permitted, subject to the following restrictions:
a) a section with a thickness less than the minimum value may be located inside a circle whose diameter does not exceed ,
where is the internal diameter according to Table 2;
- minimum thickness of the housing wall according to Table 1;
b) the measured value must be no less than ;
c) the distance between the circles must be no less than .
8.1.3. Case dimensions
8.1.3.1. The face-to-face length must comply with the requirements of ISO 5752.
8.1.3.2. The housing connecting flanges must comply with the requirements of ISO 7005-1.
Note. If the housing design does not allow drilling through holes in the flange, then threaded holes are provided.
8.1.3.3. The connecting flanges are cast or stamped together with the body or with the branch pipes of the split body, and can also be connected by welding, and for valve bodies with a nominal bore >50 mm, the flanges are butt welded. Then the heat treatment necessary to ensure that the material can be used over the entire operating temperature range is carried out.
8.1.3.4. For housings without lining, the diameters of the through holes must correspond to Table 2.
table 2
Inlet inner diameter
Nominal diameter, mm | Inner diameter of inlet, mm, |
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8.1.3.5. The minimum bore hole in full bore valves and in valves with a narrowed bore must be round in shape, and its diameter must correspond to the values specified in Table 3.
Table 3
Effective diameter
Nominal diameter, mm | Effective diameter, mm, at nominal pressure, kgf/cm |
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10, 16, 20, 25, 40, 50 | |||
narrowed passage | full pass |
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8.1.3.6. The design of the valve body with a nominal bore of 50 mm must provide for the possibility of making, if necessary, a drainage hole (see Figure 2a). The threads in the holes must comply with the requirements of ISO 7-1 and Table 4.
Table 4
Drain outlets
Nominal diameter, mm | |
50, 65, 100 | |
250 to 500 |
8.2. Ball
The holes of the ball must have a round shape and the diameters indicated in Table 3. Another form is agreed with the customer.
8.3. Rod with anti-pull-out protection
The design of the valve must prevent the stem from being “torn out” from the body in the presence of pressure in the system in case of replacing the stuffing box seal, since the seal fasteners themselves do not provide fastening of the stem.
8.4. Saddle rings
The design of the seat rings or seat assembly must allow for their replacement, with the exception of one-piece welded bodies.
8.5. Fasteners
All bolted connections shall have coarse metric (see ISO 261) or inch (see ISO 263) threads.
8.6. Requirements for antistatic performance
If necessary, valves must be provided with a device to ensure continuous electrical conductivity between the stem and body in 50 mm valves or between ball and body in larger valves. This device must meet the following requirements:
a) located in a place protected from foreign particles and corrosion under the influence of external conditions;
b) when testing devices for electrical conductivity, carried out on assembled dry products after hydrostatic tests, an energy source not exceeding 12 V DC must be used, and the discharge must occur at a resistance of not more than 10 ohms. Tests are carried out at least 5 times;
c) the design must provide for the removal of antistatic properties only by artificial means.
9. MANAGEMENT
9.1. The design of the crane provides the ability to control the crane using a handle or key.
9.2. Manually operated valves should be closed by turning the handle or wrench clockwise or counterclockwise.
Note. Closing the tap should be done clockwise, unless there are special instructions to the contrary. In this case, the customer must accurately indicate the design in accordance with Appendix 2.
9.3. The handle must be marked to indicate the "open" and "closed" positions.
9.4. The installation of the handle or key should ensure that it can be easily removed and replaced.
Note. When manufacturing valves with a wrench, the latter should be installed parallel to the passage channel in the plug, unless there is a special instruction from the customer.
9.5. The taps should be equipped with an indication of the direction of the ball passage opening. If the only direction indicator is the wrench (handle), then the assembly design must be as precise as possible.
9.6. Travel stops must be provided for both the fully open and closed positions of the valve.
10. MATERIALS
10.1. Frame
For the manufacture of the body, pipes, and cover, the materials specified in ISO 7005-1 are used. The drain plug must be made of the same material as the housing. Do not use cast iron plugs.
10.2. Ball, stem and seat ring race
The materials are chosen by the manufacturer, unless there are special instructions from the customer (see Appendix 2).
10.3. Saddle rings
The material of the rings is chosen by the manufacturer, unless there are special instructions from the customer (see Appendix 2).
10.4. To seal the rod, packing (stuffing box), seal body joints, and gaskets, materials are used that must be suitable for use at the maximum temperature indicated on the nameplate.
10.5. Tablet
The nameplate should be made of corrosion-resistant material. It must be attached with corrosion-resistant elements or welded.
11. TESTS
11.1. Each valve is pressure tested in accordance with ISO 5208 requirements.
11.2. When testing for leaks, the leak rate in a valve with gaskets made of elastomeric or polymer materials must correspond to class 3 according to ISO 5208.
12. MARKING
12.1. Each tap should be marked in accordance with the requirements of ISO 5209, except as noted below.
12.2. The marking should be applied directly to the housing or to a plate securely attached to the housing. The plate on which the marking is applied must be individual and different from the nameplate (see clause 12.3).
The housing markings must contain the following instructions:
a) nominal bore (with the corresponding numerical value) indicating the effective diameter for valves with a narrowed bore, for example 80/57;
b) conditional pressure (with the corresponding numerical value);
c) designation of the housing material (see ISO 7005-1);
d) heat designation (if required by the customer or relevant regulatory and technical documents);
e) name of the manufacturer or trademark;
f) an arrow indicating the direction of medium flow (for valves with only one-way medium flow);
g) connecting flanges that have grooves for the gasket and are marked with an o-ring (for example R25 - see ISO 70051-1). The marking must be applied to the end of both flanges.
12.3. The housing or nameplate markings must contain the following information:
a) pressure or temperature limitation set by the manufacturer depending on the material or design of the shut-off elements (pressure drop in the ball at a temperature of 20 ° C, if it is less than the pressure drop in the body).
The maximum permissible temperature and the corresponding pressure should also be indicated;
b) the number of this standard;
c) indication of antistatic design, if any (see clause 8.6).
Note. At the choice of the manufacturer or at the request of the customer, other additional information may be indicated if they do not contradict those established by this standard.
12.4. For valves with nominal bore<50 мм маркировку наносят на фирменную табличку, где указаны следующие сведения:
a) conditional passage (and the corresponding numerical value);
b) conditional pressure (and the corresponding numerical value);
c) material designation;
d) name of the manufacturer or trademark.
13. PREPARATION FOR SHIPPING
13.1. After testing, each tap must be dried and prepared for shipment.
13.2. Faucet covers must be made in accordance with the following requirements.
13.2.1. External surfaces not subject to lubrication must have an appropriate protective coating, with the exception of parts made of austenitic steels.
13.2.2. Treated working and threaded surfaces must have an easily removable coating that protects against rust, except for parts made of austenitic steels.
13.3. When transporting, the ball must be in the fully open position, unless this is prohibited by the design.
13.4. Pass-through openings and flange surfaces must be closed with wooden, plastic or metal plugs.
13.5. Cranes can be transported without packaging, securely fastened to the base (pallet) or packed in boxes.
APPENDIX 1 (mandatory). REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
ANNEX 1
Mandatory
Section, subsection, paragraph, | Designation of the corresponding standard | Designation of a domestic regulatory and technical document, |
7.1; 10.1; 12.2; 8.1.3.2 |
APPENDIX 2 (for reference). DATA PROVIDED WHEN ORDERING
APPENDIX 2
Information
Note. The clauses of this standard are given in parentheses. |
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Faucet purpose and maximum temperature |
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Conditional diameter (section 5) |
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Conditional pressure (section 6) |
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Model (section 4): |
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Full Passage | Narrowed passage | |||||||||||||||
Face-to-face length (ISO 5752) |
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The need for protection against overpressure (clause 8.1.1) |
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Housing connecting flanges (clause 8.1.3.2): |
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Flanged (with projecting surface) |
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Flanged (for O-ring seal) |
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Special processing of flanges (specify) |
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Drainage outlet, if required (clause 8.1.3.6) |
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Hole in the ball (clause 8.2): the need for a through cylindrical hole |
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Presence of antistatic element |
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Management (clause 9.1) |
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Requirement for a drive flange |
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Management (clause 9.2) |
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Need for counterclockwise closing |
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Control (9.4) |
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Special position of the wrench (handle) |
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Materials (clause 10.1) |
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Shell protecting against overpressure (please specify) |
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The need for a melting certificate |
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Leakage rate (different from that specified in clause 11.2) |
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Materials (10.2) |
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Specific material for the ball (specify exactly) |
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Materials (clause 10.2) |
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Specific material for the rod (specify exactly) |
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Materials (clause 10.3) |
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Specific material for body seat rings (specify) |
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Electronic document text
prepared by Kodeks JSC and verified against:
official publication
Hydraulic and pneumatic systems.
Valves: Sat. standards. -
M.: Standartinform, 2005
Ball valves: technical characteristics
If you decide to replace heating radiators, install plumbing or simply water or gas meters, then you will simply need to buy a ball valve or valve.
But first you need to decide on the technical characteristics of the product, methods of purpose, material of manufacture, main types and differences of ball valves for plumbing, heating, and sizes.
Why is this type of valve called ball valve?
If you take the faucet in your hands and turn the handle of the faucet, you will see a steel valve inside it, made in the form of a ball with a hole. When the tap is opened, the valve rotates, allowing free passage for the flow of water or gas. In the closed state, the “ball” is turned perpendicular to the flow, which completely blocks its movement.
Ball valve
Types of ball valves or valves, their differences, sizes and technical characteristics
Ball valves differ in the diameter of the internal passage, the type of thread (internal or external), operating pressure, material from which they are made, product manufacturer and application environment.
The diameter or size of the ball valve used when installing a water and gas pipeline varies. Most often, ball valves with an internal passage diameter of 1/2 inch or 3/4 inch are used, which corresponds to 15 mm, 20 mm or 25 mm. Less commonly used are pipes and taps with a diameter of 1 inch, 1 1/4 inches, 1 1/2 or 2 inches.
For example, in an apartment or private house, it will be quite enough to install a half-inch 1/2 ball valve for cold and hot water supply, because The diameter of the pipe always corresponds to the diameter of the tap. For a heating system, if it has a circulation pump, a pipe with a diameter of 3/4 inch and, accordingly, ball valves of the same diameter are sufficient.
If the heating system has natural coolant circulation, then it is reasonable to use pipes and taps of larger diameter. This indicator should be at least 40-50 mm.
The diameter of the ball valve is usually indicated on the valve itself. The symbol indicating these technical characteristics is DN. For example, the designation DN15 shows us that this ball valve has a nominal internal bore diameter of 15 mm or 1/2 inch.
Ball valves are distinguished by thread type. It can be internal or external. In plumbers' slang, the internal thread is called a nut, and the external thread is called a fitting. For example, a ball valve that has internal threads at both ends is called a “nut-nut” ball valve. If on one side it is internal and on the other external, then there is a “nut-fitting”, etc.
The next indicator is the operating pressure, i.e., the pressure inside the system, up to the limit of which the ball valve can be used. It is measured in atmospheres, and on the product itself is indicated under the symbol PN.
For example, the designation PN40 indicates that the valve can be used in systems with a maximum operating pressure of up to 40 atmospheres. In practice, ball valves with a rating of at least PN16 can be used even in central heating systems, for example, to connect heating radiators, gas or.
Ball valves Valtec and Bugatti
Ball valve material
It can be silumin, brass or nickel-plated brass. Under no circumstances buy faucets made of silumin. This is a fairly brittle alloy. A faucet made of this material may fall apart before it is used during installation.
You can distinguish a silumin faucet from a brass one by holding both products in your hands and comparing their weight. A faucet made of brass will be noticeably heavier.
Application area of ball valves
Typically, this type of tap is used to shut off the flow of water or gas. How to distinguish a ball valve for gas and water by external features? Everything is simple here - a tap with a yellow lever or “butterfly” is intended for a gas pipeline, taps of any other colors are for cold or hot water supply, or heating.
Ball valve manufacturers
Nowadays there are quite a few different manufacturers on the market. We recommend buying high-quality ball valves from well-known, proven brands, such as Bugatti or Valtec.
If the price for the products of these brands seems high to you, then you can purchase valves from domestic Russian manufacturers, for example, coupling ball valves 11b27p1 (GOST) of the Bologovo valve plant have proven themselves well since Soviet times, have good technical characteristics, and in addition their price production is low.
But beware of fakes, buy goods in branded stores.
What are DN, Du and PN? Plumbers and engineers must know these parameters!
DN – Standard denoting nominal internal diameter.
PN – Standard indicating nominal pressure.
What is Du?
Du– formed from two words: Diameter and Conditional. DN = DN. Du is the same as DN. It's just that DN is a more international standard. Du is the Russian-language representation of DN. Now it is absolutely necessary to abandon this name for Du.
What is DN?
DN- Standardized representation of diameter. GOST 28338-89 and GOST R 52720
Nominal diameter DN(nominal diameter; nominal bore; nominal size; nominal diameter; nominal bore): A parameter used for pipeline systems as a characteristic of the connected parts of the fittings.
Note - The nominal diameter is approximately equal to the internal diameter of the connected pipeline, expressed in millimeters and corresponding to the nearest value from a series of numbers adopted in the prescribed manner.
What is DN usually measured in?
According to the terms of the standard, it seems that it is not strictly tied to the unit of measurement (written in the documents). But it just means the diameter. And diameter is measured by length. And because the unit of length may be different. For example, inch, foot, meter and the like. For Russian documents we simply measure in mm by default. Although the documents say that it is still measured in mm. GOST 28338-89. But it does not have a unit of measurement:
How can it not, if it does? Can you write in the comments how to understand this phrase?
It seems that it has arrived... DN (diameter number expressed in millimeters). That is, it does not have a unit of measurement, but rather contains constant values (digital discrete values like: 15,20,25,32...). But it cannot be designated, for example, as DN 24. Because the number 24 is not in GOST 28338-89. There are strict values in order like: 15,20,25,32... And only these need to be selected for designation.
DN is measured by the nominal diameter in mm (millimeter = 0.001 m). And if you see DN15 in Russian documents, this will mean an internal diameter of approximately 15 mm.
Conditional pass- indicates that this is the internal diameter of the pipe, expressed in millimeters - conventionally. The term “Conditionally” indicates that the diameter value is not exact. Conventionally, we assume that it is approximately equal to certain values of the standard.
The nominal bore (nominal size) is understood as a parameter used for pipeline systems as a characteristic of the connected parts, such as pipeline connections, fittings and fittings. The nominal diameter (nominal size) is approximately equal to the internal diameter of the connected pipeline, expressed in millimeters.
According to the standard from: GOST 28338-89 It is customary to choose the numbers that have been agreed upon. And you shouldn’t come up with your own numbers with commas. For example, DN 14.9 would be a designation error.
Nominal diameter approximately equal to the internal diameter of the connected pipeline, expressed in millimeters and corresponding to the nearest value from a series of numbers adopted in the prescribed manner.
These are the numbers:
For example, if the real internal diameter is 13 mm, then we write it as: DN 12. If the internal diameter is 14 mm. then we accept the value DN 15. That is, we select the closest number from the list of the standard: GOST 28338-89.
If in projects it is necessary to indicate both the diameter and thickness of the pipe wall, then it should be indicated as follows: d20x2.2 where the outer diameter is 20 mm. And the internal diameter is equal to the difference in wall thickness. In this case, the internal diameter is 15.6 mm. GOST 21.206–2012
Alas, we have to submit to other people's standards
Any materials imported from abroad were most often developed using a different length dimension: Inch
Therefore, most often the dimensions are oriented to inches. Usually a quotation mark is written in place of the word inch.
1 inch = 25.4 mm. Which is the same 1” = 25.4 mm.
Dimensions table. Usually a quotation mark is written in place of the word inch.
1/2 “ = 25.4 / 2 = 12.7. But in reality, this size of 1/2 “is equal to a passage of 15 mm. More precisely it might be 14.9mm. for steel pipe. In general, dimensions may vary by a few mm. Therefore, in such cases, for accurate calculations, you need to find out the internal diameter of a specific model separately.
For example, size 3/4” = 25.4 x 3/4 = 19 mm. But we write in the documents “conditionally” DN20 - approximately the internal diameter is 20 mm.
Here are the actual sizes that most often correspond to the Russian translation.
The table shows the internal diameter in mm.
Nominal pressure PN: More details in GOST 26349 and GOST R 52720.
Has a unit of measurement: kgf/cm2. The designation kgf means kg x s (kilogram times s). c=1. c characterizes, as it were, a force coefficient. That is, by multiplying a kilogram (mass) by force, we convert mass into force. This is a correction for meticulous physicists. If you designate kg/cm2, in principle you will not be mistaken if you assume that we perceive mass as force. Also, such a unit as kg/cm2 is erroneous in that pressure is formed from two units (force and area). Mass is another parameter. Because the mass only on the surface of the earth creates the force that presses on the earth (gravitational force). Value c=1 on the surface of the earth. And if you fly to another planet, then the force of gravity will be different, and the mass will create a different force. And on another planet the coefficient c=1 will be equal to a different value. For example, c=0.5 will create pressure twice as low.
What is PN for?
The PN value is needed to indicate to the device a pressure limit that cannot be exceeded for normal operation of the device for which this value is set. That is, when designing, the designer must know in advance what maximum pressure the device is designed for.
For example, if the device is given the value PN15, this means that the device is designed for operation with a pressure not exceeding 15 kgf/cm2. Which is approximately equal to 15 Bar.
1 kgf/cm2 = 0.98 Bar. Roughly speaking, the PN value is approximately equal to Bar or atmosphere.
For example, if a device is given a value of PN10, then it is designed for a pressure not exceeding 10 Bar.
Determination of PN according to the standard
The highest excess operating pressure at a working medium temperature of 293 K (20 °C), which ensures a given service life (resource) of valve body parts having certain dimensions, justified by strength calculations for the selected materials and their strength characteristics at a temperature of 293 K (20 °C).
Russian standards: GOST 26349-84, GOST 356-80, GOST R 54432-2011
European standards: DIN EN 1092-1-2008
American standards: ANSI/ASME B16.5-2009, ANSI/ASME B16.47-2006
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A series of video tutorials on a private home
Part 1. Where to drill a well?
Part 2. Construction of a water well
Part 3. Laying a pipeline from the well to the house
Part 4. Automatic water supply
Water supply
Water supply for a private home. Principle of operation. Connection diagram
Self-priming surface pumps. Principle of operation. Connection diagram
Self-priming pump calculation
Calculation of diameters from central water supply
Water supply pumping station
How to choose a pump for a well?
Setting up the pressure switch
Pressure switch electrical diagram
Operating principle of a hydraulic accumulator
Sewage slope per 1 meter SNIP
Heating schemes
Hydraulic calculation of a two-pipe heating system
Hydraulic calculation of a two-pipe associated heating system Tichelman loop
Hydraulic calculation of a single-pipe heating system
Hydraulic calculation of radial distribution of a heating system
Scheme with a heat pump and solid fuel boiler - operating logic
Three-way valve from valtec + thermal head with remote sensor
Why the heating radiator in an apartment building does not heat well
How to connect a boiler to a boiler? Connection options and diagrams
DHW recirculation. Operating principle and calculation
You are not calculating the hydraulic arrow and collectors correctly
Manual hydraulic heating calculation
Calculation of warm water floors and mixing units
Three-way valve with servo drive for domestic hot water
Calculations of hot water supply, BKN. We find the volume, power of the snake, warm-up time, etc.
Water supply and heating designer
Bernoulli's equation
Calculation of water supply for apartment buildings
Automation
How servos and three-way valves work
Three-way valve to redirect the flow of coolant
Heating
Calculation of thermal power of heating radiators
Radiator section
Overgrowth and deposits in pipes impair the performance of the water supply and heating system
New pumps work differently...
Calculation of infiltration due to pressure drop
Calculation of temperature in an unheated room
Heat regulators
Room thermostat - operating principle
Mixing unit
What is a mixing unit?
Types of mixing units for heating
Characteristics and parameters of systems
Local hydraulic resistance. What is KMS?
Bandwidth Kvs. What it is?
Boiling water under pressure - what will happen?
What is hysteresis in temperatures and pressures?
What is infiltration?
What are DN, Du and PN? Plumbers and engineers must know these parameters!
Hydraulic meanings, concepts and calculation of heating system circuits
Ball valve (KSh)- general industrial pipeline shut-off valves in the design of which a ball valve made of high-quality steel is used. Modern technologies for the production of sealing materials have given a sharp impetus to the improvement of valve designs, which also made it possible to use ball valves on high-pressure pipelines up to 16 MPa (160 kg/cm). Ball valves with large bore diameters successfully compete with gate valves and butterfly valves, and have found application in the food, agricultural, gas and oil industries. It so happens that this type of shut-off valve is considered one of the most popular pipeline fittings for installers, as it has many advantages.
- Small construction dimensions - the ball valve is compact, which simplifies installation.
- The relatively light weight of the valves reduces the load on the pipeline.
- The speed of controlling the valve shutter is almost one movement.
- Choice of design options for almost any operating conditions, from steel to stainless steel.
- Reliable, virtually maintenance-free.
The increased hydraulic resistance of the valve shutter is a little confusing. Steel valves win in this regard, but you must agree - convenient control, compactness, ease of operation, aesthetic appearance, all these factors make ball valves more and more popular among consumers.
Designations of ball valves.
The diameter of ball valves is DN or Dn, this is the standard nominal bore designation generally accepted for shut-off valves. For example, the diameter can reach 1200 millimeters, abbreviated as KSh Du1200. Different countries apply different DN standards. Standard diameters of the most popular ball valves in Russia in millimeters: 6, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 400 ... and up to 1200 . Most used on pipelines KSh DN from 15 to 50 mm.
The nominal pressure of the flow media for a faucet is standardly designated Ru or Pn, for example Ru160 kg/cm or Pn16 MPa.
The type of valve may differ in connection to the pipeline and control of the valve; manufacturers usually designate short designations KSh with an additional letter, for example KShF - flanged ball valve. Well, the full designation looks something like this: KShF Du100 Ru16.
Ball valve catalog
Catalog of ball valves - steel, cold-resistant, stainless steel valves Ru up to 160 kg/cm, by connection, which can be ordered from our company.
The presented types of cranes are available in our company's warehouse at manufacturer prices with certificates and product data sheets.
Steel ball valves
To ensure uninterrupted control of flows on pipelines for different regions of our country, steel taps are manufactured in various climatic versions for installation outdoors, under sheds and indoors. The main versions are U, HL, UHL, the bulk are made by manufacturers from carbon steel St20 to U1, this applies to body parts. Cold-resistant taps are also manufactured - from steel 09G2S, which does not change its properties down to -60 degrees Celsius. Stainless steel taps are made of high-quality stainless steel 12X1810T, and less often, upon special order, they are made of acid-resistant steel.
Our company is a manufacturer and representative of the RosServis steel steering wheel manufacturer. All crane bodies are manufactured in a repairable and non-dismountable version.
The RosService enterprise manufactures steel, two- or three-piece, dismountable, repairable ball valves for pipelines with media pressure up to 16 MPa, DN from 15 to 200 mm. Read more: RosService cranes
The RosService company produces all-welded steel ball valves DN from 15 to 300 mm, PN up to 4.0 MPa, the valve body is manufactured by welding - permanent valves. More details: RosService cranes - markings, general description, materials of main parts.
Steel taps compare favorably in price with analogues made of brass, bronze and other expensive alloys, which has made them popular today for complex installation on designed new pipelines. In addition, by choosing steel taps, you save on your budget. Of course, there is an unfavorable moment - corrosion, but if a steel tap is mounted on a new pipeline and the material is selected according to the materials of the pipeline, then in fact the tap will serve you until the time of dismantling and replacing the pipeline line. The presented steel ball valves comply with Russian GOST standards for connecting parts.
| Table DN to pipe diameter (all-welded steel cranes RosService) | ||
| Du, (mm) | Nozzle diameter / pipe wall thickness (mm) | GOST |
| 15 | 21,3 / 2,8 | 3262 |
| 20 | 26,8 / 2,8 | 3262 |
| 25 | 33,5 / 3,2 | 3262 |
| 32 | 38 / 4 | 10705 |
| 40 | 48 / 3,5 | 10705 |
| 50 | 57 / 3,5 | 10705 |
| 65 | 76 /4 | 10705 |
| 80 | 89 / 4 | 10705 |
| 100 | 108 / 5 | 10705 |
| 125 | 133 / 5 | 10705/8731 |
| 150 | 159 / 6 | 10705/8731 |
| 200 | 219 / 6 | 10705/8731 |
| 250 | 273 / 8 | 10705/8731 |
| 300 | 325 / 8 | 10705/8731 |
If the acceptable cost of valves is important to you, then the price of steel ball valves is the best option.
Technical characteristics of ball valves
The characteristics of the valves depend on the materials used to manufacture the ball valve parts, compliance with production technologies and the use of modern equipment in production. As a result, the characteristics of materials used are higher, there are more possibilities for operation in the environment and a variety of compositions of flow media. Briefly about the main characteristics of KS for operation in the environment in different climatic conditions, designations: U - moderate climate, HL - moderate and cold, UHL - moderate, cold and acid-resistant. Also, service life depends on the quality and characteristics of the sealing materials of the ball valve and the valve stem.
,Technical differences of ball valves:
- According to the steel materials from which the body and moving parts of the crane are made - brass, steel, stainless steel, cold-resistant. The main element of the faucet is the ball valve in most types of stainless steel faucets.
- According to maintainability - dismountable or non-dismountable (all-welded).
- By aisle - partial bore (reduced) and full bore.
- For use in the environment - climatic version U, HL, UHL, T.
- In terms of interaction with working media - water and steam, gas mixtures, acid resistance.
Ball valve control:
- Manual control - handle or flywheel control element of the tap DN from 15mm.
- Gear control - a manual gearbox is used to control the valve for ball valves with a diameter of 50 mm or more.
- KSh with electric drive - for large pipeline diameters, the electromechanical drive of a ball valve DN from 50 to 300 mm allows you to automate the control of flow in the pipeline.
- KSh with a pneumatic drive - a valve control drive using compressed air.
For your convenience, we suggest using the questionnaire on the characteristics of ball valves on the website - a form for selecting and ordering a ball valve
Ball valve design
Ball valves, regardless of the type of body and connection to the pipeline, have one thing in common in their design and name - this is a valve in the form of a ball in a seat with sealing rings.
- The design consists of four main parts.
- The fixed part of the ball valve is the body (collapsible or all-welded)
- The moving part, the valve valve, is a ball with a passage hole and a control rod.
- The sealing elements of the ball valve and stem are rings and gaskets made of fluoroplastic or other sealing material.
- Control mechanism - handle or flywheel, gearbox, pneumatic drive or electric drive
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