Pilot operated regulating pneumatic valve structure design ( 1)

the guide type adjusting pneumatic valve with its small size, compact structure, good sealing effect, high cutting capacity ( Can reach the nominal pressure, applicability is wide and long service life, etc, in automatic control system is more and more widely used. The pneumatic valve can be used as a vent to cut off the pneumatic valve, especially high temperature, high pressure and large diameter cut required. Pilot type pneumatic valve adjustment with top-down flow structure and the separate pressure balance the forerunner of pneumatic disc, along with the pneumatic valve is closed, the pressure through the clearance between the sleeve and the main pneumatic disc back pressure pneumatic valve is closed, favorable pneumatic valve seat seal, when the forerunner of pneumatic disc and main pneumatic disc must meet specific pressure, medium pressure is higher, the pneumatic valve seal more closely. When to open the pneumatic valve, allow for the ascent of the actuator pneumatic valve stem, first open the pilot pneumatic disc, because the forerunner pneumatic valve pneumatic disc to the clearance between the sleeve and the main pneumatic disc with larger flow capacity, balance of establishing main pneumatic disc, with smaller force to open the main pneumatic disc. Guiding type to adjust the design of the pneumatic valve pneumatic valve in addition to consider the closing of the pneumatic valve performance, consider the stable performance and regulating performance of pneumatic valves, etc. The forerunner of pneumatic pneumatic valve seat valve channel to satisfy the flow capacity is greater than the guide ring and the main flow capacity of the pneumatic valve and sleeve clearance and the opening of its open control under % of pneumatic valve opening, otherwise will produce a pneumatic valve can not open or small flow unable to adjust the scope of the problem. The design principle of the spring to meet spring stiffness to resist medium pressure fluctuations, otherwise in the guide of pneumatic between disc and main pneumatic disc will produce the problem such as vibration. The role of the guide ring is mainly to increase the stability of the pneumatic valve components, limits the main pneumatic disc and sleeve caused by temperature causes the design gap bigger clearance flow capacity and the forerunner of pneumatic pneumatic valve seat valve channel flow capacity mismatch problem. Check of the role is to control the forerunner of pneumatic disc and main pneumatic disc rotation due to eddy current trends, and spring is the forerunner of pneumatic control valve disc and the main trend of pneumatic valve disc up and down direction vibration.