Pilot operated regulator, with its small size, compact structure, good sealing effect, high cutting capacity ( To reach the nominal pressure) And applicability is wide and long service life, etc, in automatic control system is more and more widely used. The valve can be used for empty cut-off valve, especially high temperature, high pressure and large diameter cut required. Pilot operated regulator has a top-down flow structure and the separate pressure balance pilot valve, with the closing of the valve, pressure through the clearance between the sleeve and the main valve disc back pressure valve is closed, good seat seal, when the pilot valve and main valve disc must meet specific pressure, the higher the medium pressure, valve seal tightly. When to open the valve, allow for the ascent of the actuator stem, first open the pilot valve, due to the pilot valve disc to the clearance between the sleeve and the main valve disc with larger flow capacity, the balance of the main valve disc build, with a smaller force to open the main valve disc. Pilot operated regulator valve design in addition to consider the closing of the valve performance, consider the stable performance and regulating performance of the valve, etc. Pilot valve seat channel to satisfy the flow capacity is greater than the guide ring and the main valve disc and sleeve clearance flow capacity and the opening of its open control under 10% of the valve opening, otherwise will produce a valve to open it 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, or between the pilot valve and main valve disc will produce the problem such as vibration. The role of the guide ring is mainly to increase the stability of the disc component, restrict the main valve disc and sleeve caused by temperature causes the design gap bigger clearance flow capacity and the pilot Industrial Valves seat channel flow capacity mismatch problem. Check of the role is to control the pilot valve and the main trend of the rotation of the disc caused by eddy current, and spring control is the forerunner of disc and the trend of the main valve disc up and down direction vibration. In this paper, the keyword search: more valve product information
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