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, 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 flap valve manufacturer in Weifang, which has a good sealing performance. At the same time the safety valve, it moves very little affected backpressure. The disadvantage is that it is reliable safety valve with the main valve and pilot valve related action as a direct-acting valve as quickly, reliably, and more complex structure. Whether it can regulate the pressure relief valve by classification, 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 valve move, often used in 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. Conventional back pressure valve for securing additional occasions, when adjusting the opening pressure after the test (in this case the back pressure is atmospheric pressure) A27H spring inching valve vendors, its setting value should be subtracted from the required opening pressure value additional back pressure values. Valve Co., Ltd. Shandong Everbright valve manufacturer specializing in the production, welcome new and old customers to order our products! Corporate culture is the soul, is an inexhaustible motive force to promote enterprise development, its core is the essence and values. Safety valve | valve manufacturers Everbright | A27H spring inching valve provided by the manufacturer, Ltd. Shandong Everbright valve. "Valve" preferred Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com), the company is located: Cravens District, Weifang City, Shandong Province Bao Tong Street North Makers Industrial Park, over the years, the group valves to provide customers with the best quality service, contact People: Manager Ma. Welcome to the new and old customers call, letter, visit the guide, business negotiations. Everbright valve expect to be your long-term partner!