Parallel Slide Gate Valve Vs Wedge Gate Valve

Weir valves controls usa inc.

Parallel slide gate valve vs wedge gate valve.

System pressure is used to provide isolation. Unique parallel slide forged cage unit design comprises all operating parts of the slide discs. Parallel slide gate valve provides a smooth flow path between seats. Bolted bonnet gate valve screwed bonnet gate valve pressure seal bonnet and.

You can see the same in images. Unlike the wedge in a wedge gate valve which only comes into contact nearly closed each disc in the parallel seat valve slides against its seat while the valve is being opened or closed. The parallel slide gate valves are mainly used in the field chemical petroleum natural gas designed to provide isolation and transmission of flow in a piping system or a component when closed sometimes can be installed in the pump outlet for regulating or control of flow. The disk is free to adjust itself to the seating surface.

By comparison a double disc wedge gate valve relies upon torque force to wedge the disc into the valve body to provide shut off. Parallel slide gate valves double disk. Gate valve body bonnet designs. Providing tight shutoff under the most severe conditions this exclusive disk and wedge design resists effects of extreme temperatures gross thermal transients high and low differential pressures and dual phase fluids.

Two discs and just one wedge design gate valve. This design of gate valve is commonly used for clean fluids and steam applications. Wedge gate valve our parallel slide gate valve design offers many advantages over double disc wedge gate valves in providing tight reliable shut off in water and steam service. In case one half of the disk is out of alignment.

Gate valves use a gate or a wedge whilst butterfly valves use a rotating disc to allow or prevent fluid flow. 29 old right road ipswich ma 01938 usa t 1 978 744 5690 f 1 978 741 3626 www global weir comparison parallel slide gate valve vs. Split wedge disk consists of two solid pieces and holds together with the help of a special mechanism. Velan pressure seal parallel slide gate valves are ideal for clean service and steam.

The closing is only made over one of the seats. Split wedge or parallel disks gate valve. Consequently these components must be made of metals which do not gall or tear when in sliding contact with each other. Moreover gate valves and butterfly valves have different body and disc designs as stated below.