he choice of valves have always to be taken considering the limitations and availabilities given. Most important

Resilient-seated gate valves have been used for more than a quarter century. While there are perhaps many aspects to compare, I believe a few advantages of modern resilient-seated valves.

The differences between Manual and Hydraulically Actuated Gate Valves.1.a manual gate valve and hydraulically actuated gatevalve 2.needle valves and gate valves.