Opening pressure adjustment: spring working pressure level within the range of nameplate Weifang valve by turning the adjustment screw to change the valve spring compression can be adjusted to the opening pressure. Before the rotation adjustment screw Shandong A27H inching valve springs, valve inlet pressure should be reduced to 90% of the opening pressure Shandong valve to prevent the valve is rotated when the rotation adjustment screw, which damage the sealing surface. Conventional additional back pressure relief valve for fixing the case, when adjusting the opening pressure after test (in this case the back pressure is atmospheric pressure), the setting value should be subtracted from the required opening pressure additional back-pressure value. 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 | Everbright Valve Model | Shandong A27H inching valve springs are provided by Shandong China Everbright Limited 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!