GB/T 4213-2024 PDF English
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| GB/T 4213-2024 | English | 515 |
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Pneumatic control valves
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| GB/T 4213-2008 | English | 85 |
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Pneumatic Industrial Process Control Valves
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| GB/T 4213-1992 | English | 559 |
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Pneumatic industrial process control valves
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GB/T 4213-2024: Pneumatic control valves---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4213-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.060.01
CCS N 16
Replacing GB/T 4213-2008
Pneumatic Control Valves
Issued on: DECEMBER 31, 2024
Implemented on: JULY 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
1 Scope... 7
2 Normative References... 7
3 Terms and Definitions... 7
4 Product Classification and General Requirements... 8
5 Technical Requirements... 11
5.1 Compressive Strength... 11
6 Test methods... 20
7 Inspection Rules... 29
7.1 Exit-factory test... 29
7.2 Type Test... 29
Appendix A (informative) Correlation of Nominal Diameters... 33
Appendix B (informative) Examples of Valve Seat Leakage Calculation... 34
1 Scope
This document specifies the product classification and general requirements, technical
requirements, test methods, inspection rules, marking, packaging and storage of pneumatic
control valves for industrial process control systems.
This document applies to various types of pneumatic control valves consisting of pneumatic
actuators and valves (hereinafter referred to as “control valves”). This document also applies to
stand-alone pneumatic actuators and valve assemblies.
Control valves with specific working conditions in countries with radioactive working
environments or other hazardous working environments may refer to this document for
implementation.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 12224 General Requirements for Industrial Steel Valves
GB/T 13384 General Specifications for Packing of Mechanical and Electrical Product
GB/T 17213 (all parts) Industrial-process Control Valves
GB/T 17213.2-2017 Industrial-process Control Valves - Part 2-1.Flow Capacity - Sizing
Equations for Fluid Flow under Installed Conditions
GB/T 26640 Specification for Minimal Thickness of the Shell of Valves
GB/T 26815 Terminologies for Industrial-process Measurement and Control Instruments -
Terms of Final Controlling Elements
3 Terms and Definitions
The terms and definitions defined in GB/T 17213 (all parts) and GB/T 26815 are applicable to
this document.
4 Product Classification and General Requirements
4.1 Classification by Control Valve Functions
In accordance with the functions of control valves, they can be classified into.
a) Adjustable type;
b) Switching type.
4.2 Classification by Control Valve Motion Mode
In accordance with the control valve motion mode, they can be classified into.
a) Linear motion;
b) Rotary motion.
4.3 Classification by Control Valve Action Mode
In accordance with the control valve action mode, they can be classified into.
a) Air-to-close type;
b) Air-to-open type.
4.4 Classification by Control Valve Actuator Type
In accordance with the type of control valve actuator, they can be classified into.
a) Pneumatic diaphragm type;
b) Pneumatic piston type.
NOTE 1.in accordance with their structure, pneumatic actuators are classified into.
a) Pneumatic diaphragm actuator;
b) Pneumatic piston actuator.
NOTE 2.in accordance with their output mode, pneumatic actuators are classified into.
a) Linear motion pneumatic actuator;
b) Rotary motion pneumatic actuator.
4.5 Nominal diameter (DN or NPS)
An alphanumeric designation consisting of the letters DN or NPS, followed by a dimensionless
number.
The value following the nominal diameter DN of the control valve shall be selected from the
following preferred values.
6, 8, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, etc.
The value following the nominal diameter NPS of the control valve shall be selected from the
following preferred values.
4.6 Nominal Pressure (PN series) or Pressure Class (Class series)
An alphanumeric designation consisting of the letters PN or Class, followed by a dimensionless
number.
The value following the nominal pressure (PN) of the control valve shall be selected from the
following preferred values.
2.5, 6, 10, 16, 25, 40, 63, 100, 160, 250, 320, 400, etc.
The value following the pressure class (Class) of the control valve shall be selected from the
following preferred values.
150, 300, 400, 600, 900, 1,500, 2,500, etc.
NOTE 1.the letters PN or Class have no meaning except in conjunction with the relevant piping
element standards.
NOTE 2.unless otherwise specified in the relevant standards, dimensionless numbers do not
represent measured values and are not used in calculations.
NOTE 3.the maximum allowable working pressure depends on the PN value or Class value,
materials, element design and working temperature, etc.
4.7 Input Signal
The input signal type and range are determined by the manufacturer or as required by the order
contract.
4.8 Gas Source
4.8.1 Maximum gas source pressure
The maximum values of the gas source pressure are as follows.
a) Pneumatic diaphragm control valve. 600 kPa;
b) Pneumatic piston control valve. 1,000 kPa.
NOTE. special gas source pressure is allowed to be used upon agreement between the user (buyer)
and the manufacturer.
4.8.2 Humidity of gas source
The dew point of the gas source at operating pressure shall be at least 10 °C lower than the
working environment temperature of the control valve.
4.8.3 Quality of gas source
The quality requirements of the gas source are as follows.
a) The gas source shall be free of obvious oils (liquid oil, suspended oil, oil vapor) and
other liquids, the oil concentration shall not exceed 5 mg/m3, and the liquid water
concentration shall not exceed 10 g/m3;
b) The gas source should not contain corrosive gases, vapor and solvents;
c) Explosive gas shall not be used as the gas source;
d) The solid particle concentration in the gas source of the control valve with a positioner
shall not exceed 5 mg/m3, and the particle diameter shall not exceed 5 m.
4.9 Normal Working Conditions
Unless otherwise specified, the control valve shall be able to normally operate in the following
atmospheric conditions.
a) Temperature. 25 C ~ +55 C, 40 C ~ +70 C or 30 C ~ +80 C; special working
temperature ranges may be used, but the temperature value shall be an integral
multiple of 5 C.
b) Relative humidity. 5% ~ 100%.
4.10 Signal Pipe Thread
5 Technical Requirements
5.1 Compressive Strength
The control valve shall be subjected to the compressive strength test using room temperature
water as the medium at a test pressure of 1.5 times the nominal pressure or 1.5 times the
maximum allowable working pressure at 38 °C. During the test, there shall be no visible leakage
from the valve body.
If agreed upon by the user (buyer) and the manufacturer, the test may be carried out on the
pressure-bearing parts, but the assembled control valve shall also be subjected to a gas test at a
pressure not exceeding 0.6 MPa, and the valve body shall not have any visible leakage.
5.2 Sealing of Packing Boxes and Other Joints
Procedure A. the test medium is room temperature water. The packing boxes and other joints
of the control valve shall ensure that there is no leakage at a test pressure of 1.1 times the
maximum allowable working pressure at 38 C. The test pressure value of special-purpose
control valves shall be agreed upon by the manufacturer and the user (buyer).
Procedure B. if agreed upon by the user (buyer) and the manufacturer, Procedure B may be
adopted. The test medium is gas. The packing boxes and other joints of the control valve shall
ensure that there is no leakage under the test pressure of 0.35 MPa. When the maximum
allowable working pressure of the valve is lower than 0.35 MPa, the test pressure is the
maximum allowable working pressure.
5.3 Leakage
5.3.1 The leakage of the control valve under the specified test conditions shall comply with the
provisions of Table 1.
5.3.2 The leakage level I of the control valve is required to be determined by the user (buyer)
and the manufacturer. However, the leakage level of the control valve with a single-seat valve
structure shall not be lower than Level IV, and the leakage level of the control valve with a
double-seat valve structure shall not be lower than Level II. Level VI is applicable to control
valves with elastic sealing valve seats.
5.3.3 When the leakage is greater than 5 103 the rated capacity of the valve, it shall be
ensured by the structural design, and the product can be exempted from testing.
5.3.4 Leakage shall be specified by the following codes.
5.3.5 When calculating and determining the allowable value of leakage, the rated capacity of
the control valve shall be calculated in accordance with the method specified in GB/T 17213.2-
2017 (see Table 3).
5.5 Intrinsic Error
The intrinsic error of the control valve shall not exceed the intrinsic error limit specified in
Table 4.The intrinsic error is expressed as a percentage of the rated stroke. The switching type
control valves are exempted from testing.
5.6 Hysteresis Plus Dead Band
The hysteresis plus dead band of the control valve shall not exceed the hysteresis plus deadband
limit specified in Table 4.The hysteresis plus dead band is expressed as a percentage of the
rated stroke. Control valves without positioners and the switching type control valves are
exempted from testing.
5.7 Start and End Point Deviation
When the input signal in the pneumatic actuator is at the upper and lower limit values, the end
point deviation of the air-to-close control valves and the start point deviation of the air-to-open
control valves shall not exceed the provisions of Table 4.The start and end point deviation is
expressed as a percentage of the rated stroke. The switching type control valves are exempted
from testing.
5.8 Dead Band
The dead band of the control valve shall not exceed the dead band limit specified in Table 4.
The dead band is expressed as a percentage of the input signal range. The switching type control
valves are exempted from testing.
5.9 Rated Stroke Deviation
The rated stroke deviation of the air-to-close control valves shall comply with the provisions of
Table 4.The rated stroke deviation of the control valves is expressed as a percentage of the
rated stroke.
6 Test methods
6.1 Test Conditions and Instructions
6.1.1 Reference working conditions
Except for surface quality inspection and other provisions in the clauses, the test shall be carried
out under the following reference conditions.
6.1.2 Recommended atmospheric conditions
Tests which are not necessary or impossible to be carried out under reference working
conditions should be carried out under the following atmospheric conditions.
6.1.3 Recommended test sequence
The recommended test sequence is specified in Table 7.
6.3 Sealing of Packing Boxes and Other Joints
Procedure A. the test medium is room temperature water (which may contain water-soluble oil
or rust inhibitor), which is injected into the valve body of the control valve in the specified inlet
direction, and the other end is closed. The test pressure is 1.1 times the maximum allowable
working pressure at 38 °C. At the same time, make the valve stem (shaft) reciprocate 1 ~ 3
times per minute for a duration of not less than 3 minutes. Observe the control valve packing
NOTE. for nominal diameters or nominal pressures (pressure classes) not listed, the test time shall be the higher-class value.
6.4 Leakage
6.4.1 The test medium shall be clean gas or room temperature water.
6.4.2 Test medium pressure.
6.4.3 Test gas source signal pressure. the pneumatic actuator shall be adjusted to the specified
working state. In Test Procedure 1, the input gas source pressure of the air-to-open control valve
actuator shall be zero; the input gas source pressure of the air-to-close control valve actuator
shall not exceed 1.2 times the upper limit of the spring pressure range; the input gas source
pressure of the switching type control valve actuator shall be the rated gas source pressure. In
Test Procedure 2, the gas source pressure of the actuator shall be the same as in Test Procedure
1.
When testing a valve that has not yet been equipped with a pneumatic actuator, a thrust device
shall be added to the test, and the force applied shall not exceed the maximum valve seat sealing
force specified by the manufacturer.
6.4.4 Test medium flow direction. the test medium shall be injected into the valve in accordance
with the specified direction. The control valve outlet shall be directly connected to the
atmosphere or connected to a low-pressure head loss measurement device whose outlet is
connected to the atmosphere. Only after it is confirmed that the valve and all downstream
connecting pipelines are completely filled with the medium and the leakage is stable can the
leakage be measured.
6.4.5 Measurement error. the measurement error of leakage and pressure shall be less than 10%
of the reading value. Appendix B gives examples of leakage calculation.
6.5 Sealing of Air Chamber
Introduce a gas source with the rated pressure specified in the design into the sealed air chamber,
cut off the gas source, and observe the pressure drop in the diaphragm air chamber or each air
chamber in the cylinder within 5 minutes. For actuator air chambers with no possibility of
internal leakage, soapy water can be applied to the seals of the air chamber to check for leakage.
For small-sized actuators, they can also be directly immersed in water to check for leakage.
6.6 Intrinsic error
When conducting the test of intrinsic error, it shall be ensured that the packing is compacted
and satisfies the requirements of 5.2.
Smoothly input the specified input signal into the actuator air chamber (or positioner) in the
increasing or decreasing direction and measure the stroke value corresponding to each point. In
accordance with Formula (1), calculate the error at each point between the actual “signalstroke”
relations and the theoretical relations. The maximum value is the intrinsic error.
6.7 Hysteresis Plus Dead Band
When conducting the test of hysteresis plus dead band, it shall be ensured that the packing is
compacted and satisfies the requirements of 5.2.
The test procedures are the same as that in 6.6.The ratio of the absolute value of the maximum
difference between the positive and negative strokes measured on the same input signal to the
rated stroke is the hysteresis plus dead band.
6.8 Start and End Point Deviation
When conducting the test of start and end point deviation, it shall be ensured that the packing
is compacted and satisfies the requirements of 5.2.
The test procedures are the same as that in 6.6.In accordance with Formula (1), calculate the
start and end point deviation.
6.9 Dead Band
When conducting the test of dead band, it shall be ensured that the packing is compacted and
satisfies the requirements of 5.2.
a) Starting from 0% or 100% of the control valve input signal, change the input signal
(by 25%, 50% and 75% of the input signal range), until the valve stem (shaft) stroke
stabilizes.
b) In the same direction, slowly change the input signal, until a perceptible change in
stroke is observed, and record the input signal value (A) at this time.
c) Continue to slowly change the input signal in the opposite direction, until a
perceptible change in stroke is observed, and record the input signal value (B) at this
time.
d) In accordance with the input signal values recorded in b) and c), and Formula (2),
calculate the dead band. The test shall be respectively performed at three points (25%,
50% and 75% of the input signal range).
6.10 Rated Stroke Deviation
When conducting the rated stroke deviation test, it shall be ensured that the packing is
compacted and satisfies the requirements of 5.2.
Smoothly input the input signal of the rated range into the actuator air chamber (or positioner)
in the increasing direction, respectively record the actual stroke of the control valve in the fully
closed position and the fully open position, and in accordance with Formula (3), calculate the
rated stroke deviation.
7.1 Exit-factory test
Each product shall pass the inspection by the manufacturer’s quality inspection department and
obtain an issued product certificate before it is allowed to exit the factory. When the complete
control valve product, actuator or valve body separately exits the factory, the exit-factory test
items are shown in Table 11.
7.2 Type Test
Type test shall be carried out under one of the following circumstances.
a) When conducting trial production and appraisal of new products or old products
transferred to other factories for production;
b) For products in normal production, when there are major changes in structure,
materials or processes that may affect product performance;
c) When the production has been suspended for more than one year and resumed;
d) When the national quality supervision institution or other administrative department
proposes a request for type test;
e) When the user (buyer) requests (for a fee) a type test.
The type test items are shown in Table 11.During the validity period of the complete product
type test, the actuator or valve body can be exempted from the type test when it separately exits
the factory.
8 Marking, Packaging and Storage
8.1 Marking
8.1.1 Valve body marking
NOTE. M stands for mandatory and S stands for supplementary.
The valve body marking should include but not be limited to the following contents. For valve
bodies smaller than DN50 (NPS2) and other valve bodies without sufficient space, the marking
is allowed to be installed on the valve body or valve cover in the form of metal marking plates.
a) Manufacturer’s name or trademark (M);
b) Nominal pressure (M);
c) Nominal diameter (M);
d) Medium flow direction (except where no flow direction requirement is specified) (M);
e) Valve body material (M);
f) Valve body material batch number (casting furnace number or forging batch number)
(M);
g) Product production serial number (S);
h) Thread or flange marking (S).
8.1.2 Nameplate marking
A nameplate shall be fixed at an appropriate position on the pneumatic actuator and shall at
least indicate.
a) Manufacturer’s name or trademark (M);
b) Product model (M);
c) Nominal diameter (M);
d) Nominal pressure (M);
e) Working temperature (only mandatory in certain special cases when it is not possible
to mark the nominal pressure and flange) (S/M);
f) Input signal range (S);
g) Rated stroke (S);
h) Rated flow coefficient (S);
i) Flow characteristics (not required for the switching type) (S);
j) Valve body material (M);
k) Design number (may also be marked on a separate nameplate) (S);
l) Product manufacturing number (M);
m) Year and month of product manufacturing (S).
For small-sized control valves, when due to the limitation of nameplate size, all markings
cannot be accommodated, some markings may be omitted, but items a), b), h), l), and m) shall
be marked on the nameplate. Other mandatory markings. c), d) and j) shall be marked on the
valve body.
8.2 Packaging
Before packaging, all uncoated and rust-prone external machined surfaces of the control valve
shall be coated with anti-rust oil or other anti-rust measures shall be taken. The valve inlet and
outlet ports and the threaded holes of the signal transmission pipe shall be sealed and properly
packaged in accordance with GB/T 13384 to ensure that they are not damaged during
transportation.
The technical documents packed with the control valve are.
a) Product exit-factory certification documents;
b) Product instruction manual;
c) Packing list;
d) Other documents required by the user (buyer).
8.3 Storage
The control valves shall be stored in a room with an air temperature of 5 C ~ 40 C and a
relative humidity of not greater than 90%. The air shall not contain harmful impurities that may
corrode the control valves.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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