Pneumatic head is another word for pneumatic device, gas pressure is driven or regulating valve opening and closing device. In this paper, the various technical requirements of pneumatic head, is expounded. 1, pneumatic device should by cylinder structure, the opening instructions, limit, pneumatic components, manual institutions, signal feedback and other parts. 2, pneumatic device connected to the valve size should comply with the provisions of GB/T12222 and GB/T12223. 3, with manual mechanism of pneumatic device in air supply is interrupted, should use the manual institution for the Industrial Valves opening and closing operation, facing the handwheel, should the handwheel or handle counterclockwise for valve open, clockwise for the Industrial Valves to close. 4, the piston rod end for internal and external thread, should be over the spanner wrench. 5, the piston sealing ring should be easy to replace and maintenance. 6, with buffering mechanism of pneumatic device, its buffering mechanism of stroke length can be reference to the provisions of the table 1. 7, with adjustable buffering mechanism of pneumatic device, shall have the external cylinder body adjust the institutions of the cushion. 8, in and out of the air cylinder thread size should comply with GB/T7306. 1 GB / T7306。 2 and the provisions of GB/T7307. 1, pneumatic device performance rated output force or moment should comply with the provisions of GB/T12222 and GB/T12223 2, under the condition of light, to enter in the cylinder pressure, as stipulated in the 'table 2' the movements should be smooth, no jam and crawl phenomenon. 3, at 0. 6 mpa, under the air pressure of pneumatic device in two directions at opening and closing of output torque and thrust, its value should be no less than the value of pneumatic device sign marked, and action should be flexible, does not allow each part in permanent deformation and other anomalies. 4, sealing experiment using maximum working pressure, leak out of the amount of air from one side of their back pressure does not allow more than ( 3 + 0. 15 d) 立方厘米/分钟( Standard state) ； Out of the end cover, the output shaft leakage air volume does not allow more than ( 3 + 0. 15 d) 立方厘米/分钟。 5, strength test in 1. 5 times the maximum working pressure test, and maintain test pressure after 3 min, the cylinder end cover and static sealing parts are not allowed to have leakage and structural deformation. 6, action, service life of pneumatic device simulation of Industrial Valves, in keeping the two directions of output torque or thrust capacity under the condition of opening and closing operation of the opening and closing times shall be not less than 50000 times ( Rev & ndash; Once closed loop for) 。 7, with buffer mechanism of pneumatic device, when the piston movement to visit terminal location, impact phenomenon is not allowed. Surface and appearance quality 1, casting the end cover, the end of the cylinder on the flange, casing shall not be cut, cut, porosity, burrs, etc. 2, pneumatic device outside surface coating layer or chemical treatment should level off, smooth, uniform color, no pollution, indentation, and other mechanical damage. Pneumatic head test method test method for no-load test 1, pneumatic device in horizontal, pressuring cylinder sides alternately as stipulated in the 'table 2' air pressure, exhaust side leads to the atmosphere, make the pneumatic device for switch operation. Test results should be consistent with ( 2) performance The provisions of the. 2, cylinder with buffering mechanism, in the no-load test, cushion valve should be fully open. Strength test using 70% kerosene and 30% spindle oil blend oil or compressed air as medium, press 1. Five times the maximum cylinder pressure, Allows the use of the maximum pressure value) Alternately, the pressure in the cylinder, and maintain pressure after 3 min, observe the appearance and the collapse of the check cylinder, the result should meet ( 5) performance The provisions of the. With air test, the safety protection measures must be taken. Load test will pneumatic device installed on the test bench, pressuring cylinder 0, respectively. 6 mpa pressure of compressed air, and gradually applied to the output shaft torque or thrust, amount of the output torque of pneumatic device or thrust, its value is not less than specified value of pneumatic device sign. At the same time rival mechanism, the time limit, the opening instructions, information feedback, such as components one by one check, the result should be consistent with ( 3) performance Rules. Sealing test of pneumatic device in no-load cases, from the two inlet alternating maximum working pressure 1. 1 times of compressed air, check the piston air leakage, output shaft. The holding 3 min, leakage should be consistent with ( 4) performance The provisions of the. Another inspection seal test method: check gauge indicates pressure, lasts for 5 min, qualified for gage pressure does not drop. You can choose any one of two methods. Action life test will pneumatic device installed on the test bench, under the load of rated output torque, valve opening and closing action process to simulate the drive cycle operation, until the pneumatic device output torque or thrust is less than the rated torque or thrust, while the number of times lifespan. Action number should be consistent with life, 6) performance Rules. Pneumatic head type testing inspection rules rules ( Have one on the right side of the situation should be type testing) 1, trial-manufacture of new products or old products factory pattern evaluation 2, when the normal production of the product design, process, production equipment, management, and other aspects have changed greatly, that may affect product performance when 3, normal production, regularly or accumulate a certain output, should be a periodic test 4, and 5 when not resume production in the production of products for a long time, factory inspection results and 6, the last time differ from that of type testing, the state administration of quality supervision institutions put forward during the type testing required to sign, In pneumatic device apparent parts should be equipped with product signs, signs shall comply with the provisions of GB/T13306 shall be marked on the right) 1, manufacturer name, product name and model number 3, 2 output rated torque or thrust
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