Such non-direct acting valve safety valve can be divided into pilot safety valve, safety valve driving force auxiliary device. Pilot valve is to rely on the media discharged from the pilot valve to drive or control. The pilot valve itself is a direct-acting valve springs Shandong A27H inching valve, sometimes with other forms of valves. Pilot valve suitable for high pressure, large diameter occasions. The main valve pilot valve can also be designed to rely on the work of the media to seal the form, or can be applied much larger than the direct-acting valve mechanical load on the valve, which has a good sealing performance. At the same time, it moves very little affected by backpressure. The disadvantage is that it is reliable safety valve with the main valve and pilot valve related Weifang valve, direct action is not as fast-acting valve, reliable, and more complex structure. Whether the pressure relief valve can be adjusted according to the valve, Shandong, can be divided into fixed and adjustable relief valve and adjustable valve 1. Fixed non-adjustable pressure relief valve is factory set, can not be changed when using the safety valve safety valve, commonly In the central air conditioning, boiler boiler, solar energy systems. 2. adjustable pressure relief valve off can vary in a range of needs of users can be set, commonly used in applications often need to change the system to protect the pressure, but the prices are generally relatively high. Safety valve, the valve model Everbright, Ltd. Shandong A27H safety valve provided by Shandong Everbright valve. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) strong, credible, Shandong Weifang ball industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Everbright valve into the brilliant and you work for a better future!