GB/T 4213-2024 English PDF (GB/T4213-2024)

GB/T 4213-2024: Pneumatic control valves
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GB/T 4213-2024
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
气动控制阀
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
4.1 Classification by Control Valve Functions... 8
4.2 Classification by Control Valve Motion Mode... 8
4.3 Classification by Control Valve Action Mode... 8
4.4 Classification by Control Valve Actuator Type... 8
4.5 Nominal diameter (DN or NPS)... 8
4.6 Nominal Pressure (PN series) or Pressure Class (Class series)... 9
4.7 Input Signal... 9
4.8 Gas Source... 10
4.9 Normal Working Conditions... 10
4.10 Signal Pipe Thread... 10
4.11 Types and Dimensions of Connection End... 11
5 Technical Requirements... 11
5.1 Compressive Strength... 11
5.2 Sealing of Packing Boxes and Other Joints... 11
5.3 Leakage... 11
5.4 Sealing of Air Chamber... 15
5.5 Intrinsic Error... 15
5.6 Hysteresis Plus Dead Band... 15
5.7 Start and End Point Deviation... 15
5.8 Dead Band... 15
5.9 Rated Stroke Deviation... 16
5.10 Rated Flow Coefficient... 16
5.11 Inherent Flow Characteristics... 16
5.12 Resistance to Operational Vibration... 18
5.13 Action life... 18
5.14 Wall Thickness of Valve Body... 19
5.15 Chemical Composition of Valve Body and Valve Cover... 19
5.16 Surface quality... 19
Pneumatic Control Valves
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.
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.
଼,
ସ,
଼,
ଶ,
ସ, 1, 1
ସ,1
ଶ, 2, 2
ଶ, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, etc.
NOTE 1.the dimensionless number for nominal diameter is directly associated with a characteristic
dimension, for example, the bore or outer diameter of an end connector.
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 correlation between DN and NPS is shown in Appendix A.
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
The thread types and sizes of the connection between the pneumatic actuator and the signal
transmission pipeline are NPTଵ଼, NPT
ସ, NPT
଼ and NPT
ଶ, etc. Other types and sizes may also
be used in accordance with the user (buyer) requirements.
4.11 Types and Dimensions of Connection End
The types and sizes of connection end shall meet the following requirements.
a) The types of connection end of the control valve are flange, welding, thread and
double-clip type, etc.;
b) The types and sizes of the control valve connection end shall comply with the
corresponding provisions in the national standards and industry standards;
c) Other standard or specific connection end types and sizes required by the user (buyer).
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
conditions. After the test, the intrinsic error, hysteresis plus dead band, air chamber
sealing, and sealing of packing boxes and other joints of the adjusting control valves
shall comply with the requirements of this document. After the test, the air chamber
sealing, and sealing of packing boxes and other joints of the switching type control
valves shall comply with the requirements of this document;
b) The number of times each type of control valve actions can be selected from the
following number systems.
2,500, 4,000, 10,000, 20,000, 40,000, 100,000, 160,000;
c) For various types of adjustable control valves with nominal pressure  PN63, nominal
diameter  DN300, equipped with pneumatic diaphragm actuators,
polytetrafluoroethylene molded packing, and non-elastic seals, the action life times
shall not be lower than 100,000;
d) The action life of special-purpose control valves may be agreed upon by the
manufacturer and the user (buyer).
5.14 Wall Thickness of Valve Body
For iron valves, the wall thickness of valve body shall comply with the provisions of GB/T
26640; for steel valves, the wall thickness of valve body shall comply with the provisions of
GB/T 12224.
If agreed upon by the user (buyer) and the manufacturer, the wall thickness of valve body may
be designed in accordance with the requirements of other standards.
5.15 Chemical Composition of Valve Body and Valve Cover
It shall comply with the requirements of corresponding material standards.
5.16 Surface quality
The pneumatic actuator and valve surface of the control valve shall be painted or coated with
other coatings. If the valve body is made of stainless steel or copper, the surface does not need
to be painted.
The surface coating of the pneumatic actuator and valve shall be smooth and intact, and there
shall be no defects, such as. peeling, bruises and scars; the fasteners shall not be loose or
damaged. The stroke scale and pointer of the pneumatic actuator shall be firmly installed and
have clear indications.
5.17 Others
The various kinds of control valves used for special occasions, such as. fire prevention,
explosion prevention, corrosion prevention, high temperature and high pressure, etc. shall
comply with the technical requirements specified in relevant standards.
box and other joints for leakage. After the test, it shall be drained, cleaned and dried. After
passing the test, the packing box shall not be adjusted in subsequent tests.
Procedure B. the test medium is clean gas. In accordance with the specified inlet direction,
introduce it into the valve body of the control valve, with the outlet end closed. The test pressure
is 0.35 MPa. 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 box and other joints
for leakage. If the maximum allowable working pressure of the control valve is less than 0.35
MPa, the test pressure shall be the maximum allowable working pressure.
6.4 Leakage
6.4.1 The test medium shall be clean gas or room temperature water.
6.4.2 Test medium pressure.
a) In Test Procedure 1, it shall be 0.35 MPa. When the maximum working pressure
difference of the control valve is less than 0.35 MPa, the maximum working pressure
difference specified in the design shall be adopted, and the deviation shall be within
5%;
b) In Test Procedure 2, it shall be the maximum working pressure difference of the
control valve, and the deviation shall be within 5%.
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 ...