Technical conditions for valve pneumatic devices


The technical conditions of valve pneumatic devices are introduced and analyzed in the following aspects:scope,normative references,Terms and Definitions,skills requirement,labeling, packaging, storage,testing regulationsand test methods.

1 Scope

This standard specifies the definition, technical requirements, test methods, inspection rules, signs, packaging and storage of industrial valve pneumatic devices (hereinafter referred to as “pneumatic devices”).

This standard applies to linear pneumatic devices for linear motion, rotary pneumatic devices for rotary motion (360° rotation), and pneumatic devices with electromagnetic control for industrial valves.

The operating conditions of the pneumatic device are as follows:

Working pressure: 0.4MPa~0.7MPa;

Working environment: temperature -20℃~80℃;

The gas source should be clean and dry air, and must not contain corrosive gases, solvents or other liquids;

2 Normative references


The clauses in the following documents become the clauses of this standard through the reference of this standard. For dated references, all subsequent amendments (excluding errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement based on this standard to study whether newer versions of these documents can be used Version. For undated references, the newer version applies to this standard.

GB/T 699 High Quality Carbon Structural Steel

GB/T 700 carbon structural steel (GB/T 700-1988, neq DIN 630: 1987)

GB/T 1173 Cast Aluminum Alloys (GB/T 1173-1995, neq ASTM B26: 1992)

GB/T 1176 Cast Copper Alloy Specifications (GB/T 1176-1987, neq ISO 1338: 1977)

GB/T 1220 stainless steel rod (GB/T 1220-1992, neq JIS G4303: 1988)

GB/T 7306.1 55° sealing pipe thread – Part 1: Cylindrical internal thread and tapered external thread (GB/T 7306.1-2000, eqv ISO 7-1: 1994)

GB/T 7306.2 55°Sealing Pipe Threads Part 2, Tapered Internal Thread and Tapered External Thread (GB/T 7306.2-2000, eqv ISO 7-1:1994)

GB/T 7307 55° non-sealed pipe thread (GB/T 7307-2001, eqv ISO 228-1: 1994)

GB/T 9439 gray iron castings

GB/T 12222 Connection of multi-turn valve actuators (GB/T 12222-2003, ISO 5210:1991, MOD)

GB/T 12223 Connection of part-turn valve actuators (GB/T 12223-2003, ISO 5211:2001, MOD)

GB/T 13306 Signage

QB/T 3625 PTFE sheet

QB/T 3626 PTFE Rods

3 Terms and Definitions

The following terms and definitions apply to this standard.

3.1 linear pneumatic actuator linear pneumatic actuator

In a closed gas circuit, a pneumatic device that relies on the action of compressed air to make the output shaft of the pneumatic device move linearly.

3.2 rotary pneumatic actuator rotary pneumatic actuator

In a closed gas circuit, a pneumatic device that relies on compressed air to make the output shaft of the pneumatic device rotate less than 360°.

3.3 stroke of pneumatic actuator

Under the action of compressed air, the output shaft of the pneumatic device has a linear displacement along the direction of its axis or an angular displacement around the center of its axis.

4 Technical Requirements

4.1 Pneumatic device structure

4.1.1 The pneumatic device shall be composed of cylinder, opening indicator, travel limit, pneumatic components, manual mechanism, signal feedback and other components.

4.1.2 The connection size of the pneumatic device and the valve shall comply with the provisions of GB/T 12222 and GB/T 12223.

4.1.3 For pneumatic devices with a buffer mechanism, the stroke length of the buffer mechanism can refer to the provisions in Table 1.

4.1.4 Pneumatic devices with adjustable buffer mechanism should have a mechanism outside the cylinder body to adjust its buffer effect.

4.1.5 For pneumatic devices with manual mechanism, when the air source is interrupted, the manual mechanism should be used to open and close the valve. When facing the handwheel, the handwheel or handle should be rotated counterclockwise to open the valve, and clockwise to open the valve. valve off.

4.1.6 When the end of the piston rod has internal and external threads, there should be a wrench opening suitable for a standard wrench.

4.1.7 The sealing ring of the piston should be easy to replace and repair.

4.1.8 The thread size of the air inlet and outlet of the cylinder shall comply with the provisions of GB/T 7306.1, GB/T 7306.2 and GB/T 7307.

4.2 Performance

4.2.1 The rated output force or moment of the pneumatic device shall comply with the provisions of GB/T 12222 and GB/T 12223.

4.2.2 Under no-load conditions, input the air pressure specified in Table 2 into the cylinder, and its action should be smooth without jamming and crawling.

4.2.3 Under the air pressure of 0.6MPa, the output torque or thrust in the two directions of opening and closing of the pneumatic device should not be less than the value indicated on the signboard of the pneumatic device, and the action should be flexible, and no permanent deformation of each part is allowed and other abnormalities.

4.2.4 When the sealing test is carried out with a relatively high working pressure, the amount of air leaked from each side of the back pressure is not allowed to exceed (3+0.15D) cm3/min (standard state); leaks from the end cover and output shaft The amount of air out is not allowed to exceed (3+0.15d) cm3/min.

Note: D is the inner diameter of the cylinder, d is the diameter of the output shaft, and the unit is mm; for the vane cylinder, D is one-third of the circumference of the vane.

4.2.5 The strength test is carried out with 1.5 times the maximum working pressure. After maintaining the test pressure for 3 minutes, no leakage or structural deformation is allowed at the cylinder end cover and static sealing parts.

4.2.6 The number of action life, the pneumatic device simulates the valve action, under the condition of maintaining the output torque or thrust capacity in two directions, the opening and closing times of the opening and closing operation should not be less than 50,000 times (opening-closing cycle is one time).

4.2.7 For the pneumatic device with buffer mechanism, when the piston moves to the end position of the stroke, no impact phenomenon is allowed.

4.3 Surface and appearance quality

4.3.1 There must be no scratches, cuts, air holes, burrs, etc. on the end cover, end flange, and box of the cast cylinder.

4.3.2 The paint layer or chemical treatment layer on the outer surface of the pneumatic device should be flat, smooth, uniform in color, free of oil stains, indentations and other mechanical damage.

4.4 Materials

See Appendix A for common materials of main parts.

5 Test method

5.1 No-load test

5.1.1 The pneumatic device is placed horizontally, and the air pressure specified in Table 2 is alternately applied to both sides of the cylinder, and the exhaust side is opened to the atmosphere, so that the pneumatic device can be switched on and off. The test results should comply with the provisions of 4.2.2.

5.1.2 For the cylinder with buffer mechanism, the buffer valve should be fully opened during the no-load test.

5.2 Strength test

Use the mixed oil of 70% kerosene and 30% spindle oil or compressed air as the medium, apply pressure to the cylinder alternately according to 1.5 times the working pressure of the larger cylinder (the higher pressure value allowed), and keep the pressure for 3 minutes. Observe the appearance of the cylinder and disassemble it for inspection. The result should meet the requirements of 4.2.5. When testing with air, safety precautions must be taken.

5.3 Load test

Install the pneumatic device on the test bench, apply 0.6MPa compressed air to the cylinder respectively, and gradually apply torque or thrust to the output shaft, measure the output torque or thrust of the pneumatic device at this time, and its value is not less than the specification on the label of the pneumatic device value. At the same time, check the manual mechanism, opening indication, travel limit, information feedback and other components one by one, and the results should meet the requirements of 4.2.3.

5.4 Sealing test

When the pneumatic device is under no-load condition, alternately apply compressed air of 1.1 times the maximum working pressure from the two inlets, and check the leakage of the piston and the output shaft. Hold the pressure for 3 minutes, and the leakage should meet the requirements of 4.2.4. Another inspection method for the sealing test: check the pressure indicated by the pressure gauge for 5 minutes, and the gauge pressure does not drop as qualified. Choose one of two methods.

5.5 Operation life cycle test

Install the pneumatic device on the test bench, and under the load of the rated output torque, simulate the opening and closing action process of the driving valve for cyclic operation until the output torque or thrust of the pneumatic device is less than the specified rated torque or thrust. The number of actions at this time is the service life frequency. The number of action lifespans shall comply with the provisions of 4.2.6.

6 inspection rules

6.1 Factory inspection

Each pneumatic device shall undergo a factory inspection before leaving the factory, and the factory inspection items and technical requirements shall be in accordance with the provisions in Table 3.

6.2 Type test

6.2.1 Type test should be carried out in one of the following situations

a) Trial type identification of new products or old products transferred to factory;

b) When there are major changes in the design, process, production equipment, management, etc. of the normally produced product, which may affect the performance of the product;

c) During normal production, a test should be carried out periodically or after a certain amount of production has been accumulated;

d) When resuming production of products that have not been produced for a long time;

c) When there is a large difference between the factory inspection result and the previous type test;

f) When the national quality supervision agency requests to conduct type tests.

6.2.2 The type test shall be randomly selected from the inventory of pneumatic device products that have passed the inspection by the quality inspection department of the manufacturer or the products that have been provided to the user but have not been used. The minimum number of units for sampling is 10 units, and the number of sampling units is 3 units. When it comes to user sampling, the number of units for sampling is not limited.

6.2.3 The type test items shall be in accordance with the provisions in Table 3, and one of the two units shall be selected for the action life test.

6.2.4 The technical requirements of the type test shall be in accordance with the provisions in Table 3, and all inspection items shall meet the provisions in Table 3.

7 Labeling, packaging, storage

7.1 Logo

The product label should be installed on the obvious part of the pneumatic device, and the label should meet the requirements of GB/T 13306, and should indicate the following content:

a) The name of the manufacturer;

b) product name and model;

c) output rated torque or thrust;

d) Cylinder working pressure;

e) Product serial number;

f) date of manufacture.

7.2 Packaging

7.2.1 Pneumatic devices shall be shipped in boxes and shall be fixed in the box.

7.2.2 The packing box should be firm and able to prevent rain. There should be a clear mark on the surface of the packing box that is not easy to erase, and the content is:

a) The name and address of the manufacturer;

b) product name and model;

c) The name and address of the receiving unit;

d) contract number;

e) Gross weight and volume (length x width x height).

7.2.3 When leaving the factory, the pneumatic device shall be accompanied by the product qualification certificate, the product instruction manual and the packing list stamped by the inspector. The packing list shall include the following contents:

a) The name and address of the manufacturer;

b) Product name, model, standard number;

c) Product serial number;

d) net weight of the product;

e) Attached documents, names and quantities of spare parts;

f) Packing quantity;

g) Packing date.

7.3 Storage

The product should be stored in a ventilated, dry and clean room.
The above is a comprehensive summary of all the technical conditions of the valve pneumatic device, and I hope it will be helpful to everyone.

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