Gate valve has a small fluid resistance, apply pressure and wide temperature range, is one of the most commonly used block valves, used to truncate or on line in the medium. Size shrinkage can make parts size shrink, the opening and closing force corresponding decreases, and at the same time can also enlarge the range of parts and components. But after size shrinkage, fluid resistance loss increased. Adopted widely in the domestic low pressure valve is cast iron material, cast iron gate valve body frost crack often happen, the damper loss serious problems, such as stem rust easily, cast iron gate valves of the poor quality of packing gasket, internal and external leakage. Shanghai valve factory production PN10 of low carbon steel gate valve instead of the traditional iron gate, effectively solve the cast iron gate valve shell easy to frost crack, ram, easy to fall off, stem rust easily, sealed performance is not reliable. 1, light weight, body adopts advanced black ball made from cast iron, compared with traditional gate valves, the weight about 20% ~ 20% reduction in weight, easy installation and maintenance. 2, the overall package: ram using high quality rubber in the whole, outsourcing, the European first-class rubber vulcanization technology make the gate to ensure accurate after vulcanization of geometry size, and rubber and ductile cast gate then, fall off not easily and elastic memory preferred. 3, flat type brake block: traditional gate often wash the tube in the water after the external objects such as stone, wood, cement, iron filings, sundry sedimentation on the bottom of the valve such as the slots, easy to cause cannot close tightly and form slack phenomenon, at the bottom of the seal of the elastic base seat gate valves with water pipe with flat design, not easy to cause debris deposition, make the flow unimpeded. 4, jingzhu valve: the valve body adopts precision casting, precise geometry size inside the body to ensure the valve without the need for any finish sealing. |