This article presents in tabular form data on the labeling of pipeline fittings products produced in the countries of the post-Soviet space. The symbol is a table of figures and/or drawing number.

The table of figures consists of numbers and letters: the first two numbers indicate the type and type of fittings (Table 1), the letter behind the numbers indicates the body material (Table 2), one or two numbers after the letters indicate the registration number; if there are three digits, the first indicates the type of drive (Table 3), and the next two indicate the registration number; the last two letters indicate the material of the sealing surfaces (Table 4) and the method of internal coating of parts (assemblies) of the base element (Table 5).

In some cases, after the letters indicating the material of the sealing surfaces, a number is added that indicates the version of the product or its manufacture from a different material.

For products in export or tropical versions, the letters E and T are at the end of the tzana symbol, respectively.

Example of a symbol: 30ch964brT - valve with a body made of gray cast iron, with an electric drive, with a brass ring in the valve, in a tropical design.

Table 1. Type of fittings - symbol.

Crane (test and drain)	10
Valve (for pipeline)	11
Level indicator device	12
Shut-off valve	13, 14, 15, 22
Check Valve	16
safety valve	17
Reverse shutter	19
Pressure regulator	18, 21
Distribution valve	23
Control valve	25, 26
Gate valve	30, 31
Disc valve	32
Hose valve	33
Elevator	40
steam trap	45

Table 2. Housing material - symbol

Unalloyed steel	With
Alloy steel	PM
High alloy steel	nz
Cast iron with flake graphite	h
Malleable cast iron	CC
High-strength cast iron	HF
Brass, bronze	B
Aluminum	A
Monel - metal	pl
	P
Viniplast	vn
Porcelain	To
Titanium alloy	tn
Glass	sk

Table 3. Drive - symbol

Remote control
Mechanical with worm gear	3
Mechanical with spur gear transmission	4
Mechanical with bevel gear	5
Pneumatic	6
Hydraulic	7
Pneumohydraulic	6(7)
Electromagnetic	8
Electric	9

Table 4. Seal material - symbol.

Brass, bronze	br
Monel - metal	pl
High alloy steel	nz
Babbitt	bt
Stellite	st
Leather	To
Ebonite	uh
Rubber	R
Plastics (except vinyl plastic)	P
Viniplast	VP

Table 5. Method of applying internal coating

Drawing number

For general industrial fittings produced by specialized valve manufacturing enterprises, the drawing is assigned a number in accordance with OST 26-07-2046-82. In this case, the letter symbol of the developer or manufacturer is indicated before the numbers (one or two letters), the first two digits determine the name of the reinforcement (type, type and main design features of the reinforcement), the next three digits determine the serial number of the product within a given design variety, the last three digits determine the nominal bore of this product (for products with DN from 1000 mm, the designation of the nominal bore consists of four digits). Valves produced by enterprises belonging to various departments (for example, shipbuilding, power engineering, etc.) have a designation system adopted by these departments.

Summary memo for beginning specialists and interested partners in related fields:

Devices installed on pipelines, called pipeline fittings, are designed for a variety of purposes - control, regulation, protection, monitoring and many other functions. For a more understandable designation, pipeline and shut-off valves were classified as units by sections to clarify operational properties, functions and purposes. The standard for definitions and terms for pipeline fittings - GOST 24856-2014 was adopted on May 30, 2014. It was agreed upon and approved by Russia, Belarus, Armenia, Kyrgyzstan, Uzbekistan and Ukraine. The interstate standard has been in force in the Russian Federation since April 1, 2015 and includes definitions and terms; the classification of pipeline shut-off valves is divided into a fairly large number of main types:

• Shut-off valves are devices used for periodic or one-time turning on or shutting off part of a pipeline or object (valves, valves, gate valves, taps, etc.
• Control valves are devices used to partially block flow sections and change the amount of flowing liquid in order to regulate flow rates, pressure, level, temperature, medium composition, etc.;
• Safety valves are devices used to limit operating parameters and prevent emergency conditions: releasing excess medium in case of excessive pressure increase (safety and bypass valves), preventing the movement of the medium in the opposite direction (check valves);
• Control valves - devices designed to determine the presence or level of liquid (test valves, level indicators);
• Various fittings are devices used, for example, to drain one of the phases of the medium: condensate (condensate drains), air (plungers), oil (oil separators), etc.

In addition, shut-off valves can be classified into the following types:

• According to the method of application - the areas of application in a particular production environment of shut-off valves can vary dramatically, therefore the valves are divided into: industrial, special, marine, sanitary fittings
• By structural types of fittings - in this classification, types of fittings are divided depending on their design features (gate valves, gate valves, taps, valves)
• By connection method - in this case, the method of connecting the fittings to the pipeline is considered (connection using couplings, flanges, fittings or welding)
• According to the method of sealing the fittings - relative to the external environment (stuffing box, membrane, hose, bellows fittings)
• According to the method of controlling the valves. From the point of view of control method, valves are divided into remote controlled valves, automatically controlled valves and manually controlled valves

The main parameters by which one or another shut-off valve is selected are:

1. Nominal passage diameter Dy - internal diameter of the pipeline to which the fittings are connected
2. Operating pressure P - the pressure at which the valve is operated
3. Conditional medium pressure Ru - nominal medium pressure, usually corresponding to the working pressure at a medium temperature t = 0-120 0C for cast iron fittings and t = 0-200 0C for carbon steel fittings
4. Test pressure is the pressure at which a hydraulic strength test of the fittings is performed.

In our company, it is customary to designate all manufactured products with general industrial markings in accordance with international standards. This is done for more convenient product identification and a brief description of the product. The designations can be deciphered as follows:

All shut-off valves according to classification have a standard type of designation XXaaYYbb

Where XX and YY have a digital designation

aa and bb letter designation

“XX” the first digits indicate the type of fittings:

• 10 - tap (trial run)
• 11- tap (for pipeline)
• 12 - level indicator locking device
• 13,14,15 - shut-off valves (valves) of various types and designs.
• 22.24 - shut-off valve
• 16 - check valve
• 17 - safety valve
• 19 - check valve, sealed valve
• 20 - bypass valve
• 18.21 - pressure regulator
• 23 - distribution valve
• 27 - mixing valve
• 30.31 - valve
• 32 - rotary shutter
• 33 - hose valve
• 40 - elevator
• 45 - condensate drain

The type of pipeline shut-off valve briefly indicates the purpose, main design and functional features of the devices.

Then follow the letters “aa”, they indicate the material of the body parts.

• C - Carbon steel
• LS - alloy steel
• NJ - stainless steel
• H - gray cast iron
• KCh - malleable cast iron
• HF - high-strength cast iron
• B - brass, bronze
• A - aluminum
• MN - monel metal
• P - plastic
• VN - vinyl plastic
• K - porcelain
• TN - titanium alloy
• SK - glass

This is followed by the numbers “YY” indicating the nomenclature general industrial series

• BC - without rings
• BR - brass, bronze
• MN - Monnel metal
• NJ - stainless steel
• NT - nitrided steel
• BT - babbitt
• ST - stellite
• SR - sormite
• K - skin
• E - ebonite
• R - rubber
• P - plastic
• VP - vinyl plastic

Example of decoding according to the classification of shut-off valves:

Let's look at one of the most popular examples. U 15s68nzh

15 - shut-off valve

C - carbon steel

68 - nomenclature designation

NZh - sealing material is made of stainless steel

The international standard for the classification of shut-off valves has clarified the general rules for the development, adoption, acceptance and application in the valve industry of countries that have approved this GOST.

According to GOST R 52720-2007 PIPELINE FITTINGS, table of figures (t/f) is a symbol, which is a combination of letters and numbers that determine the type and type of valve, the design of the valve, the material design of the body, the type and material of the seal in the valve, and the type of actuator."

It is very easy to understand the designations of tables and figures - just remember the tables of numbers of names of fittings and letters of materials. Letters are abbreviated names of materials.

Example

The table-figure consists of: - The first two digits - a table indicating the type of product (gate, valve, etc.). The complete list is given in Table 1.

Table 1

The first two digits in the product type designation	Type of fittings
10	Trial crane
11	Pipeline tap
12	Locking device for level indicator
13,14,15	Stop valve
16	Check Valve
17,28	safety valve
18,21	Pressure regulator
19	Reverse shutter
20	Bypass valve
22,24	Waste valve
23	Distribution valve
25,26	Control valve
27	Mixing valve
30,31	Gate valve
32	Butterfly valve
33	Hose valve
40	Elevator
45	steam trap
46	Filter
50	Solenoid valve block

The complete list is given in Table 2.

Table 3

If the drive is manual, then they usually indicate not three, but two numbers indicating the figure (model number). - after the numbers there are letters indicating the material of the sealing surfaces or internal coating (Table 4)

Table 4

To increase the service life, tightness and other characteristics of the product, surfacing from various materials is made on the inner surface of the body at the points of contact with the locking body. Their corresponding designations are given below:

If it is necessary to achieve certain parameters inside the entire product, an internal coating is applied. Then, instead of designating the material of the sealing surfaces, use the designation of the method of applying the internal coating:

Table 5

Examples of decoding using tables and figures:

1. 15kch888r:

• 15 - shut-off valve;
• kch - body made of malleable cast iron;
• 8 - control using an electromagnetic drive (if only 2 digits - manual control);
• 88 - model number;
• r - with rubber sealing rings.

2. 30nzh41nzh:

• 30 - valve;
• nzh - stainless steel body;
• 41 - model number (only 2 digits - manual drive);
• NZ - sealing rings are welded on stainless steel

At the end of the table of figures, a number may be inserted indicating various design options for the product, whether it is made of a different material, etc.

Examples

• 15nzh40p1- environments in relation to which the materials used are corrosion-resistant, the temperature of the working environment is up to 200 degrees.
• 15nzh40p2- working medium - freon containing oils, working medium temperature from minus 100 degrees Celsius to plus 150 degrees Celsius.

Previous page

For pipelines for different purposes, different types of shut-off valves are used. In order to correctly select a device for a particular pipeline system, you need to know the purpose of the fittings and its technical characteristics. Let's look at the main types of locking devices in more detail.

Scope of application of shut-off valves

Shut-off valves are intended:

1. for pipelines supplying gas or water to residential, domestic and industrial premises and discharging sewage. This is the widest scope of application of locking devices;
2. for pipelines carrying aggressive substances. Devices for the chemical and oil and gas industries will demand higher tightness and corrosion resistance;
3. household networks, heat supply and sewerage. The fittings installed on private networks are small in size and easy to manage.

Only fittings that are intended specifically for this type can be installed on the pipeline.

Types of shut-off valves

The following types of shut-off pipeline valves are distinguished:

• taps;
• gates (valves);
• valves;
• flaps.

Crane classification

Shut-off valves are primarily designed for low-pressure domestic pipelines.

The shut-off valve design is as follows:

• frame;
• locking element;
• handle;
• set of sealing gaskets.

Devices can be classified according to several criteria:

• type of locking element;
• installation method.

An element that blocks the flow of a passing medium can be:

• ball. In accordance with this, the valve is called a ball valve (figure above);
• cone in the form of a plug (plug valve).

The taps can be attached to the pipeline:

• coupling method. The fixing nuts are screwed onto the thread prepared on the pipe;

• flange method. The fixing elements are flanges connected to each other with bolts;
• welding method.

Each tap has its own symbol. The markings on the device body must include:

• nominal diameter (DN);
• conditional pressure for which the device is designed (PN);
• material used to make the tap;
• manufacturer;
• additional reference materials (date of manufacture, batch number, etc.).

If you know the markings, you can always choose a locking device yourself.

Using Gates

The shut-off valve () consists of a body with two ends for attaching the device and a seat that is closed by a shutter.

The main distinguishing feature of a valve from a faucet is its high tightness class, which allows the device to be used on gas pipelines.

A valve, like a faucet, can be connected to a pipeline using couplings, flanges or welding.

Valves are produced that are actuated by:

• flywheel (manual control);
• electric drive (electronic control), including using a remote control.

The marking of shut-off valves also contains:

• symbol of the device model;
• passage;
• designation of the type of connection to the pipeline;
• pressure;
• execution material;
• Climatic performance;
• document on the basis of which the valve is manufactured.

Purpose and types of valves

The most commonly used element of any pipeline is the valve. The device consists of a body and a cover, between which the shutter is located.

The purpose of shut-off valves - valves - is any pipelines whose diameter varies from 15 mm to 2000 mm.

The advantages of the device, compared to other types of shut-off valves, are:

• ease of maintenance and design;
• small sizes;
• low resistance.

Gate valves can be made from the following materials:

• become;
• cast iron;
• non-ferrous metals and alloys made from them.

The valves are controlled:

• manually (rotating the handle);
• electric drive;
• hydraulic drive.

Valves with electric or hydraulic drive are mainly installed on industrial pipelines.

The designation of shut-off valves (valve) determines:

• type and name of the device;
• nominal working diameter;
• maximum pressure in the system;
• type of drive;
• position of the device in working condition;
• accommodation category;
• Climatic performance;
• type of connection of the device to the pipeline.

Purpose of dampers

The closing element in the damper is a disk that rotates around an axis.

Valves are mainly used on pipelines that have a large diameter and are under low pressure, since the tightness class of the device is quite low.

The damper can be controlled:

• a flywheel that drives the axis of rotation (manual control);
• hydraulic drive;
• electric drive.

In most cases, the body of the locking device is made of cast iron, and the rotary disk is made of steel.

Dampers are installed:

• welding method;
• flange fasteners.

The valves can be used in chemical pipelines and sewer systems. They are practically not used for water supply or heating.

The brand of shut-off valves - valves, as well as the batch number, diameter, pressure and area of ​​definition are indicated on the device body similarly to the previously given diagrams.

Symbols of shut-off valves

Each type and subtype of shut-off valves used in pipeline construction has its own symbol, which makes it easier for builders to select a device.

For example, a gate valve is denoted by two triangles connected by vertices.

How other fittings are designated is indicated in the figure below.

Thus, each type of shut-off valve is intended for specific pipelines. To select the most suitable device, you can use the markings that are applied to the product body or indicated in the pipeline diagram.

Preface

The goals and principles of standardization in the Russian Federation are established by Federal Law No. 184-FZ of December 27, 2002 “On Technical Regulation”, and the rules for applying national standards of the Russian Federation are GOST R 1.0-2004 “Standardization in the Russian Federation. Basic provisions"

Standard information

1 PREPARED by the Closed Joint Stock Company "Research and Production Company "Central Design Bureau of Valve Engineering" (CJSC "NPF "TsKBA") and the Scientific and Industrial Association of Valve Manufacturers (NPAA)2 INTRODUCED by the Technical Committee for Standardization TC 259 "Pipeline Valves and Bellows"3 APPROVED AND ENTERED INTO EFFECT by Decree of the Federal Agency for Technical Regulation and Metrology dated October 18, 2007 No. 264-st4 Marking marks 1 to 19 given in Table 1 of Section 4 of this standard are identical to marking marks 1 to 19 of clause 2.5 of the international standard ISO 5209 “Industrial fittings for general purpose. Marking"5 INTRODUCED FOR THE FIRST TIME Information on changes to this standard is published in the annually published information index "National Standards", and the text of changes and amendments is published in the monthly published information index "National Standards". In case of revision (replacement) or cancellation of this standard, the corresponding notice will be published in the monthly published information index “National Standards”. Relevant information, notifications and texts are also posted in the public information system - on the official website of the Federal Agency for Technical Regulation and Metrology on the Internet

GOST R 52760-2007

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

Pipeline fittings

REQUIREMENTS FOR MARKING AND DISTINGUISHING COLOR

Pipeline valves. Requirements for the marking and distinctive painting

Date of introduction - 2008-03-01

1 area of ​​use

This standard applies to pipeline fittings (hereinafter referred to as fittings) and establishes requirements for the content, location, structural elements and methods of marking, as well as for the distinctive color of the fittings depending on the material of the housing parts operating under pressure.

2 Normative references

This standard uses regulatory references to the following interstate standards: GOST R 52720-2007 Pipeline fittings. Terms and definitions GOST 2.310-68 Unified system of design documentation. Applying designations of coatings, thermal and other types of treatment on drawings GOST 2.314-68 Unified system of design documentation. Instructions on the drawings for marking and branding of products GOST 7.67-2003 (ISO 3166-1:1997) System of standards for information, library and publishing. Country name codes GOST 12.2.063-81 System of occupational safety standards. Industrial pipeline fittings. General safety requirements GOST 26.008-85 Fonts for inscriptions applied by engraving. Executive dimensions GOST 356-80 Fittings and pipeline parts. Conditional, test and working pressures. Series GOST 2171-90 Parts, products, semi-finished products and blanks made of non-ferrous metals and alloys. Brand designation GOST 2930-62 Measuring instruments. Fonts and signs GOST 26349-84 Pipeline connections and fittings. Nominal (conditional) pressures. Series GOST 28338-89 (ISO 6708-80) Pipeline connections and fittings. The passages are conditional (nominal dimensions). Rows Note- When using this standard, it is advisable to check the validity of the reference standards. If the reference standard is replaced (changed), then when using this standard you should be guided by the replacing (changed) standard. If the reference standard is canceled without replacement, then the provision in which a reference is made to it is applied in the part that does not affect this reference.

3 Terms and definitions

This standard uses terms according to GOST 2.314, GOST 356, GOST 26349, GOST 28338, GOST R 52720-2007, as well as the following terms with corresponding definitions: 3.1 distinctive color: Coating of the outer surface of the body parts of the fittings, the color of which corresponds to the regulatory document or design documentation.

4 Labeling requirements

4.1 Contents of valve markings 4.1.1 The list of marking signs and valve parameters characterized by these signs is given in Table 1. Table 1 - Marking signs

Marking sign number

Parameter characterized by sign

Characteristics of the sign and example

Nominal diameter DN

The sign represents the numerical part of the designation of the nominal diameter (nominal diameter) according to GOST 28338.

Examples

1 For fittings DN 100:

100

2 For fittings DN 300:

300

For different nominal diameters of connecting pipes, the nominal diameter is marked for the inlet pipe or the values ​​​​are indicated through a fraction.

Examples

1 100/80

2 100/150

Nominal pressure PN

The sign is a designation of nominal pressure according to GOST 26349.

Example - For fittings with a nominal pressure of 12.5 MPa (125 kgf/cm2):

PN 125

At different nominal pressures of the inlet and outlet pipes, the nominal pressure is marked for the inlet pipe or indicated through a fraction, while the value for the inlet pipe is indicated in the numerator, and for the outlet pipe in the denominator

Example - PN 100/ PN 40

Housing material

The sign represents the designation of the material grade according to the documentation or a symbol (code), the explanation of which is given in the operational documentation

Trademark and/or manufacturer's name

-

Direction of supply of working fluid to the valve

The sign is an arrow that can be executed:

- parallel to the axis (axes) of the valve nozzles;

- at an angle to the axis of the pipes to indicate the flow of the working medium under the spool (up arrow) or onto the spool (down arrow)

Designation of gasket for sealing valve flanges

The parameters of the sign are given in the design documentation for a specific product.

Maximum permissible temperature or range of permissible temperatures of the working environment t

Examples

1 For a maximum temperature of 150 °C:

t 150

2 For temperature range from - 250 °C to + 100 °C:

t from - 250 to + 100;

or

Designation of threads of connecting pipes

The mark is a designation of a thread according to its standard.

Examples

1 M 36×2

2 R 1 1 / 2 "

Operating pressure R p or design pressure R

The sign is an alphanumeric combination.

Examples

1 For valves with operating pressure of 15 MPa

(150 kgf/cm 2): p R 150

2 For valves for working pressure

5 · 10 -3 mmHg: Hg 5 · 10 -3

3 For valves operating in the operating pressure range from 5 · 10 -3 mm Hg. Art. up to 15 MPa (150 kgf/cm 2):

om Hg 5 · 10 -3 to r R 150

4 For fittings with a design pressure of 9 MPa (90 kgf/cm2):

p90

Designation of fittings (actuator)

According to the main design document

Standard designation

If the product is standardized

Heat number

The sign is included in the marking if the body parts are cast

Index (code) of fittings with characteristics of internal parts of fittings

The mark is included in the marking if there is an industry or company indexing (coding) system

Service category

The sign is included in the marking if there is an industry or proprietary maintenance and repair system

Lining designation

Mark of conformity

In accordance with current legislation. It is allowed to use Russian, international or foreign marks of conformity

Controller's mark

Year of manufacture, serial number of product

Hydraulic characteristics

The parameters of the sign are given in the design documentation for a specific product.

Examples

1 For a conditional throughput of 63 m 3 /h and linear throughput characteristics of control valves:

OK v at 63

2 Too - for equal percentage characteristic:

PKv at 63

Designation of the country of origin

When supplied for export, the “Made in Russia” marking is carried out in Russian and/or a foreign language in accordance with the design documentation and/or contract

Designation of the medium or phase state of the medium

Used when the fittings are designed and/or tested for specific environments

Examples

1 For liquid media: F u l u L

2 For gaseous media: G or G

3 For water: B or W

4 For water vapor: P or WSP

5 For oil or oil: NF or O

6 For chlorine: C l

7 For hydrogen sulfide: H 2 S

8 For ammonia: N.H. 3

Position of the locking or control element when there is no power in the drive unit

Examples

1 For normally open valves: NO

2 For normally closed valves: NC

4.1.2 Mandatory signs 4.1.2.1 Markings 1 (nominal diameter), 2 (nominal pressure), 3 (housing material), 4 (trademark and/or manufacturer’s name) are mandatory. Marking sign 2 can be replaced or supplemented by marking signs 7 (maximum temperature) and 9 (working pressure). 4.1.2.2 Marking 5 is mandatory for valves with a regulated direction of supply of the working fluid. 4.1.2.3 Other markings are mandatory if this is specified in the standards for certain types of fittings, design documentation (CD) or in supply contracts. 4.1.3 The list of marking signs must be given in the design documentation for specific products, and it is allowed: - individual marking signs (for example, body material, lining designation, etc.) are given in abbreviated form or with special signs adopted by the manufacturer; - body material made of non-ferrous parts and alloys should be marked with a short brand designation given in GOST 2171; - exclude from the marking of products intended for export signs that are not standardized in importing countries; - introduce into the markings signs not provided for in Table 1 (for example: R etc ( p h) - test pressure; R n - setting pressure of safety valves or pressure regulator; AC- fittings for nuclear power plants; Deff - effective diameter for narrowed fittings (taps, valves); catalog and/or schematic number of the product, etc.), provided that the possibility of confusing these signs with the signs given in Table 1.4.1.4 is excluded. All marking signs must be repeated and explained in the operational documentation for the valves. 4.1.5 Marking of flywheels “Open - Closed” must comply with the requirements of GOST 12.2.063. 4.1.6 The upper end of the valve spindle (butterfly valve) must have structural elements (for example, splines or protrusions), the location of which corresponds to the location of the channels in the valve plug (the position of the butterfly valve disk). 4.2 Place of marking of fittings 4.2.1 Markings are applied on both the front and back sides of the case. The front side is considered to be the right side of the valve body when looking in the direction of the medium flow. If the direction of the working medium is not regulated, the front and back sides of the valve body are designated in the design documentation. 4.2.2 Markings are applied: - signs 1, 2, 3, 5, 7, 9 - on the front side of the case; - sign 6 - on the flange; - sign 8 - on the connecting pipes; - the remaining signs are on the back of the case. 4.2.3 Mandatory markings should be applied to the housing and/or to a plate securely attached to the housing. Requirements for the manufacture and fastening of plates should be given in the design documentation for the product. 4.2.4 It is allowed: - to apply all markings on one side of the body; - marks 4, 8, 10 - 21 should be applied to the flange. 4.2.5 For DN fittings< 50 необязательные знаки маркировки допускается наносить на бирке. Требования к изготовлению бирки и ее креплению на арматуре должны быть приведены в КД на изделие.4.2.6 Рекомендуемое расположение знаков маркировки приведены на рисунке 1.

Front side

Flange

back side

Option 1

Option 2

PN 25

F13 (6)

G 3-A

R R20 /t 300

ABVG.423316.080

St. 20

08Х18Н10Т

2006-63

Made in Russia

Note- To the right of the sign image, the sign numbers according to Table 1 are indicated in parentheses.

4.3 Methods for marking reinforcement 4.3.1 When marking by casting: - font sizes and arrows - in accordance with Appendix A; - the font should not be slanted; - unspecified font sizes - in accordance with GOST 2930. 4.3.2 When marking by engraving, the font is performed in accordance with GOST 26.008. The dimensions of marking signs not listed in the specified standard, as well as the relative position of all signs, are indicated in the design documentation for the product. 4.3.3 When marking is carried out using methods other than casting and engraving, the font must comply with GOST 2930, and the arrow and relative position of the marking signs must comply with the design documentation for the product. 4.4 Structural elements of reinforcement markings 4.4.1 Requirements for marking are given on the drawing of the part (assembly unit) on which it is intended to be placed. 4.4.2 Marking instructions are given in accordance with GOST 2.314. At the same time, references to standards and other regulatory documents are allowed only if the referenced documents fully define the labeling requirements. Otherwise, all necessary data is provided in the CD. 4.5 Examples of marking of fittings with mandatory signs are given in Appendix B. 4.6 Marking of drive devices for pipeline fittings 4.6.1 The content, location, methods of execution and design elements of marking of drive devices for pipeline fittings are indicated in the design documentation for the drive device. In this case, the markings include signs 4, 10, 11, 17, 18 according to Table 1, as well as other signs at the discretion of the developer of the drive device. 4.6.2 It is recommended to include in the marking content of drive devices: - for pneumatic and hydraulic drives - maximum control pressure, maximum force (pulling, pushing) at maximum and minimum control pressure, stroke, climatic version according to GOST 15150, etc.; - for electric drives - maximum torque on the output shaft, maximum force on the rod (plunger), voltage, power consumption, number of revolutions (stroke) per minute, stroke of the rod (plunger), operating mode (PV), explosion protection category, climatic version according to GOST 15150, etc.

5 Requirements for distinctive coloring

5.1 The external surfaces of cast iron and steel reinforcement must be painted in a distinctive color in accordance with Table 2. Table 2 - Distinctive coloring of reinforcement

Material of valve body parts

Material group

Distinctive paint color

Gray, malleable, high-strength cast iron

Carbon steel

Alloy steel

High alloy steel and corrosion-resistant, heat-resistant superalloys

Note- If the body parts are welded joints from materials of different groups, then the color of the coating is indicated in the design documentation for the product.

5.2 The type of coating that forms the distinctive color is indicated in accordance with GOST 2.310 in the design documentation for the product. 5.3 It is allowed: - not to apply a distinctive color to reinforcement made of group IV material according to Table 2, as well as to reinforcement that has protective and/or protective-decorative coatings on the outer surface; - use phosphating as a distinctive color for group I reinforcement according to Table 2; - in agreement with the customer, change the color of the distinctive painting, as well as not perform distinctive painting at all or limit it to a primer; - do not apply distinctive colors to components (drives, gearboxes, etc.) installed on the valves.

Font sizes for marking fittings

Table A.1 - Font sizes

Dimensions in millimeters

Font number

Nominal diameter

Font size

Sign and arrow profile dimensions

Height of letters and numbers

Width of letters and numbers

Spacing between words

Spacing between letters and numbers

Line spacing

Profile width

Profile height (depth)

Arrow length

DN 50 or less