Internal thread spool

Internal thread spool without maintenance, is run, run, drip, leak killer. The principle is driven rotary piston by a hand wheel through the stem in the hole down the middle frame to complete the opening and closing function reciprocates. Internal thread spool valve in operation between the plunger and the sealing ring with an interference fit, adjusting stud by adjusting the valve cover flange, the seal ring compression lateral force in the valve body and the plunger cylindrical bore surface produced seal. Due to elasticity, abrasion resistance, non-toxic high new sealing material with any changes due to thermal expansion caused by automatic compensation, thus ensuring the valve seal, put an end to the internal and external leakage. At the same time internal thread spool valve open torque, large sealing area, wide media adapt high temperature, sealing reliable, long life, easy maintenance. Widely used in petroleum, chemical, power, pharmaceutical, food and other industries. See: http: //www.zgchuanhu.com/zsf.html plunger valve plunger valve http://www.chuanhuvalve.com/zhusaifa/zhusaifa.asp