In contrast, gate valves are bidirectional, and will entirely shut off the flow of fluid, vapour or fuel in both of those directions when in the shut situation. The 2 primary varieties of gate valves are wedge-formed and parallel. Wedge-shaped gate valves (which include sound taper wedge, flexible wedge and https://dallasdxqtn.blogproducer.com/34641135/5-essential-elements-for-thermostatic-mixing-valve