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JB/T 7368-2015Valve positioners for industry-process control systems (English PDF)

工业过程控制系统用阀门定位器

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

October 10, 2015

Implementation date

March 1, 2016

Scope

JB/T 7368-2015 is the English-translated version of 工业过程控制系统用阀门定位器.

JB/T 7368-2015 is the Chinese standard "Valve positioners for industry-process control systems".

Its scope clause reads: This standard specifies the terms and definitions, product classification and basic parameters, technical requirements, test methods, inspection rules, marking and packaging and storage of valve positioners for industry-process control systems (hereafter referred to as "positioners").

This standard is applicable to various conventional pneumatic positioners used matching with pneumatic actuator, being capable of accepting standard analog input signal or digital signal and having pneumatic output, the electric-pneumatic positioners and the electric-pneumatic positioners with microprocessors.

Its clauses include terms and definitions; product classification and basic parameters.

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Document preview — JB/T 7368-2015

National Standard of the People's Republic of China

ICS: 23.060.40; 25.040.40
Replacing: JB/T 7368-1994

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Product Classification and Basic Parameters
4.1 Product Classification
4.2 Basic Parameters
4.3 Working Conditions
4.4 Installation
5 Technical Requirements
5.1 Basic Error
5.2 Return Difference
5.3 Dead Zone
5.4 Air Consumption
5.5 Drift
5.6 Overrange
5.7 Action Life
5.8 Functional Characteristics (Only Applicable to Positioner with Microprocessor)
5.9 Influence of Air Supply Pressure Variation
5.10 Influence of Environmental Temperature Variation
5.11 Influence of Mechanical Vibration
5.12 Electrostatic Discharge Immunity
5.13 Radiated Radio-frequency Electromagnetic Field Immunity
5.14 Electrical Fast Transient/Burst Immunity
5.15 Power Frequency Magnetic Field Immunity
5.16 Insulation Resistance
5.17 Insulation Strength
5.18 Explosion-proof Performance
5.19 Enclosure Protection Degree
5.20 Transportation Environment Resistance
5.21 Appearance
6 Test Methods
6.1 Test Conditions
6.2 Basic Error Test
6.3 Return Difference Test
6.4 Dead Zone Test
6.5 Air Consumption Test
6.6 Drift Test
6.7 Overrange Test
6.8 Action Life Test
6.9 Inspection for Functional Characteristics (Only Applicable to Positioner with Microprocessor)
6.10 Air Supply Pressure Variation Influence Test
6.11 Environmental Temperature Variation Influence Test
6.12 Mechanical Vibration Influence Test
6.13 Electrostatic Discharge Immunity Test
6.14 Radiated Radio-frequency Electromagnetic Field Immunity Test
6.15 Electrical Fast Transient/Burst Immunity Test
6.16 Power Frequency Magnetic Field Immunity Test
6.17 Insulation Resistance Test
6.18 Insulation Strength Test
6.19 Explosion-proof Performance Test
6.20 Enclosure Protection Degree
6.21 Transportation Environment Resistance Test
6.22 Appearance Inspection
7 Inspection Rules
7.1 End-of-manufacturing Inspection
7.2 Type Inspection
8 Marking, Packaging and Storage
8.1 Marking.
8.2 Packaging
8.3 Storage

1 Scope

This standard specifies the terms and definitions, product classification and basic parameters, technical requirements, test methods, inspection rules, marking and packaging and storage of valve positioners for industry-process control systems (hereafter referred to as "positioners").

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB 3836 (all parts) Explosive Atmospheres

GB 4208-2008 Degrees of Protection Provided by Enclosure (IP Code)

GB/T 13384-2008 General Specifications for Packing of Mechanical and Electrical Product

GB/T 17213.6 Industrial-process Control Valves - Part 6-1: Mounting Details for Attachment of Positioners to Control Valves - Positioner Mounting on Linear Actuators

GB/T 17213.13 Industrial-process Control Valves - Part 6-2: Mounting Details for Attachment of Positioners to Valves - Positioner Mounting on Rotary Actuators

GB/T 17626.2 Electromagnetic Compatibility - Testing and Measurement Techniques - Electrostatic Discharge Immunity Test

GB/T 17626.3 Electromagnetic Compatibility - Testing and Measurement Techniques-Radiated Radio-frequency Electromagnetic Field Immunity Test

GB/T 17626.4 Electromagnetic Compatibility - Testing and Measurement Techniques - Electrical Fast Transient/Burst Immunity Test

GB/T 17626.8 Electromagnetic Compatibility - Testing and Measurement Techniques - Power Frequency Magnetic Field Immunity Test

GB/T 18271.1-2000 Process Measurement and Control Devices - General Methods and Procedures for Evaluating Performance - Part 1: General Considerations

GB/T 22137.1-2008 Valve Positioners for Use in Industrial-process Control System - Part 1: Methods of Evaluating the Performance of Valve Positioners with Pneumatic Outputs

GB/T 22137.2-2008 Valve Positioners for Use in Industrial-process Control System - Part 2: Methods of Evaluating the Performance of Intelligent Value Positioners with Pneumatic Outputs

GB/T 25480-2010 Basic Environmental Conditions and Testing Methods for Transportation and Storage of Instruments

GB/T 26815-2011 Terminologies for Industrial Process Measurement and Control Instruments - Terms of Final Controlling Elements

3 Terms and Definitions

For the purposes of this document, the following terms and definitions apply.

3.1 valve positioner

a kind of positioner which is mechanically associated with valve or actuator and automatically adjusts the pressure output to the actuator to ensure the specified accurate relation between valve position and input signal

[Definition in 2.7.3 of GB/T 26815-2011]

3.2 single acting positioner

positioner having only one output signal

[Definition in 2.7.4 of GB/T 26815-2011]

3.3 double-acting positioner

positioner having opposite output signals in two action directions

[Definition in 2.7.5 of GB/T 26815-2011]

4 Product Classification and Basic Parameters

4.1 Product Classification

4.1.1 Classification according to structure

According to composition structure, the positioners are classified into:

a) Conventional positioner;

b) Positioner with microprocessor.

4.1.2 Classification according to the actuators equipped

According to the actuators equipped, the positioners are classified into:

a) Positioner equipped with pneumatic diaphragm actuator;

b) Positioner equipped with pneumatic piston actuator;

c) Positioner equipped with other pneumatic actuators.

4.1.3 Classification according to the mode of output action

According to the mode of output action, the positioners are classified into:

a) Single acting positioner;

b) Double-acting positioner.

4.1.4 Classification according to working mode

According to working mode, single acting positioners are classified into:

a) Positive acting positioner;

b) Reverse acting positioner.

Note: Positive acting positioner - both input signal and output pressure are increased;

Reverse acting positioner - the input signal is increased while the output pressure is reduced.

4.1.5 Classification according to output travel

According to output travel, the positioners are classified into:

a) Linear positioner;

b) Rotary positioner.

4.1.6 Classification according to service environment

According to service environment, the positioners are classified into:

a) Ordinary type positioner;

b) Explosion-proof type positioner.

4.1.7 Classification according to input signal

According to input signal, the positioners are classified into:

a) Pneumatic valve positioner;

b) Electric-pneumatic valve positioner.

4.1.8 Classification according to input signal range

According to input signal range, the positioners are classified into:

a) Positioner with standard input signal range;

b) Positioner with split input signal range.

4.1.9 Classification according to output characteristics

According to output characteristics, the positioners are classified into:

a) Positioner with linear output characteristics;

b) Positioner with equal percentage output characteristics;

c) Positioner with quick-opening output characteristics;

d) Others.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB 4208-2008

Similar standards

GB/T 22137.2-2018|GB/T 28777-2012|GB/T 22135-2019|JB/T 13274-2017|JB/T 12739-2016|GB 30439.6-2014

Editions of JB/T 7368

Edition	Title	Revision	Status
JB/T 7368-2015	Valve positioners for industry-process control systems	current edition	Current
JB/T 7368-1994	Valve positioners for industry-process control systems	previous edition	Superseded

This page sells the current edition, JB/T 7368-2015. Earlier editions are listed for reference only.

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