Electricity industry standard "Electric Power Industry Boiler and Pressure Vessel Supervision Regulation" (DL612-1996) 9.1.13 check valve instrument expressly provides: "purely mechanical spring safety valve can be used to adjust the hydraulic system verifies the entire Kai spring safety valve, usually at 75% to 80% of rated pressure. After the adjusted valve hydraulics, safety valve should be at least the minimum value from the actual seat Seat review. "safety valve Shandong valve means opening height greater than or equal 1/4 channel diameter of the safety valve. This part of the operating characteristics of the two-acting valve safety valve. The main parameters of the safety valve displacement A28H spring safety valve, the displacement depends on the caliber of the valve seat and valve opening height, from the opening of different height, is divided into Weiqi the entire Kai two. Weiqi is the valve opening height for the seat throat diameter of 1/40 ~ l / 20. Entire Kai is the valve opening height for the seat throat diameter of 1/4. Safety valve | valve manufacturers | Everbright valve (Certified Merchant) Ltd 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!