Leveraged safety working principle of the pneumatic valve and how to adjust

pneumatic valve lever type safety is the use of heavy hammer and leveraged to balance the forces acting on the pneumatic disc to work. According to the principle of leverage, it can use the heavy hammer through leverage with the increase of quality of the smaller force become larger, and by moving the position of the heavy hammer ( Or transform the quality of the heavy hammer to adjust security pneumatic valve opening pressure. Pneumatic valve lever type safety to prevent heavy hammer to mobile devices and limit lever deviant guide frame.
security lever pneumatic valve has simple structure, adjustment, easy and accurate, and the load by pneumatic have larger increase with the rising of the disc, is suitable for high temperature occasion, used more widely, especially in the boiler temperature and high pressure vessel. But heavy hammer lever type safety pneumatic valve structure is bulky, easy loading mechanism vibration, and often the leakage due to vibration; The back pressure is low, is not easy to shut down and keep tight after opening.
how pneumatic valve adjustment lever type safe? If you want to raise the opening pressure is heavy hammer to offshoring, in contrast to lower opening pressure to move the heavy hammer. Some safety lever pneumatic valve is double hammer ( Double lever security pneumatic valve) , that is, can have the effect of two security pneumatic valve, general multi-purpose in steam boiler and steam system, if it is double hammer safety set most pneumatic valve opening pressure for a high one low, after the first set of high pressure to set a low pressure, if two pressure, can adjust on the weight of a prior to hang a pipe wrench, or by hand press again the next.