Parallel Slide Gate Valve Vs Wedge Gate Valve

Split wedge disk consists of two solid pieces and holds together with the help of a special mechanism.

Parallel slide gate valve vs wedge gate valve. The disk is free to adjust itself to the seating surface. You can see the same in images. 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. Gate valves use a gate or a wedge whilst butterfly valves use a rotating disc to allow or prevent fluid flow.

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. System pressure is used to provide isolation. By comparison a double disc wedge gate valve relies upon torque force to wedge the disc into the valve body to provide shut off. The split disk can be in a wedge shape or a parallel disk type.

Gate valve body bonnet designs. Parallel slide gate valves double disk. 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. Moreover gate valves and butterfly valves have different body and disc designs as stated below.

Weir valves controls usa inc. Consequently these components must be made of metals which do not gall or tear when in sliding contact with each other. Velan pressure seal parallel slide gate valves are ideal for clean service and steam. Two discs and just one wedge design gate valve.

In case one half of the disk is out of alignment. Our parallel slide gate valve uses position seating allowing the line force in the system to assist in the sealing of the valve seat by holding the downstream disc firmly against the downstream seat. 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. Velan s proven pressure seal design.

Unique parallel slide forged cage unit design comprises all operating parts of the slide discs. 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 closing is only made over one of the seats. Parallel slide gate valve provides a smooth flow path between seats.