The gate valve size design of non metal sealing flange drum type plunger valve and metal sealing flange connecting drum shaped plunger valve handwheel operation mechanism has two forms, namely the hand wheel rotation instead of just moves up and down the stem only move up and down without rotation. When the valve fully open stem elongation to the highest point, but still in the protective sleeve.
The advantages of such a hand wheel operating mechanism are as follows:
1, the hand wheel does not move up and down the space occupied by the small, suitable for the installation of a compact space in the pipeline system.
2, hand wheel rotation torque, not directly on the stem, the stem is not easy to produce bending deformation, and the rotation torque is small.
3, the stem in the protection of the upper and lower movement, and outside isolation, suitable for outdoor installation, to avoid the atmosphere of the wind blown sand wear and corrosion of acid and alkali materials.
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