There are instances where higher pressure steam may enter the line. In this case, someone manually opens this valve to reduce the pressure.

According to the complaints of a client of the finishing of double relief and gate valves, we had to disassemble the valves completely

For gate valves with working pressures of up to about 800 psi for water supply.

Boiler non-return valve (also referedto as a Stop Check valve) is a check valve that can be closed. This valve has a disc and stem but the stem is not fastened to the disc.

Different valve size and rating , I need to order Gear Box for I have experienced alot that Gear Box get damage .

A domestic equivalent to the Larox rubber pinch valve? Larox's core business is filter presses.

While the hydrostatic proof test of control valves is well defined (e.g. ANSI/ISA-75.19) I have not been able to find a corresponding standard for burst testing.

My general belief is to try and use something other than a knife gate. These valves were originally designed for the Pulp&Paper Industry and would leak both through the seat and the bonnet.