Safety valve springs with handles, safety valves, valve Everbright (View) provided by Valve Co., Ltd. Shandong China Everbright. Valve Co., Ltd. Shandong China Everbright (www.sdgdfm.com) is specialized in the "valve" of the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Manager Ma. The operating philosophy: sincere, to the letter, innovation, refinement management strategy: people-oriented, fine quality management principles: do, we should do our best brand objectives: to build national industry brand, world brand, a hundred years brand Valve Co., Ltd. Shandong, China Everbright professional production safety valve spring safety valve manufacturer, welcome new and old customers to order our products! Safety valve means opening height is greater than the channel diameter equal to 1/4 of the safety valve. This part of the operating characteristics of the two-acting valve safety valve. The main parameters of the safety valve is a safety valve displacement, 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.