1. faults and eliminate leaks. Under normal operating pressure equipment, valves, more than allowed levels of leakage between the valve and valve seat sealing surface. The reasons are: dirt between the valve seat sealing surface. You can use a wrench to open the valve lift several times, valve brand, rushed to the dirt; sealing surface damage. Should be based on the degree of damage, the use of grinding or turning grinding method to repair; stem bending, tilting or deflection lever and fulcrum, the valve body and the valve flap dislocation. Should be re-fitted or replaced; spring elasticity or loss of elasticity. Should be taken to replace the spring, readjust the opening pressure and other measures. Power industry standard "Electricity Supervision Regulation for boiler and pressure vessel industry" (DL612-1996) 9.1.13 for instrument calibration valve clearly states: "purely mechanical spring safety valve can be used hydraulic device calibration adjustments, generally 75% ~ 80% of rated pressure. After the safety valve, cast steel valve hydraulics adjusted, the lowest since at least safety valve seat from the base value of the actual review. "safety valve means opening height greater than or equal 1/4 the diameter of the valve flow channel. This safety valve operating characteristics belonging to two-acting valve. The main parameters of the safety valve displacement, this displacement depends on the caliber of the valve seat and valve opening height, by the opening of different height, then 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. Valves wholesale, China Everbright Valves Ltd provided by Shandong Everbright valve. Valves wholesale, China Everbright Valves Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) this year introduced a new upgrade, the above picture is for reference only, please call Tel picture on this page or to obtain the latest information, contact People: Manager Ma.