Parallel Slide Gate Valve Vs Wedge Gate Valve

Two discs and just one wedge design gate valve.

Parallel slide gate valve vs wedge gate valve.

Velan pressure seal parallel slide gate valves are ideal for clean service and steam. 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 disk is free to adjust itself to the seating surface. 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.

Moreover gate valves and butterfly valves have different body and disc designs as stated below. This design of gate valve is commonly used for clean fluids and steam applications. 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. Parallel slide gate valves double disk.

The closing is only made over one of the seats. In case one half of the disk is out of alignment. Bolted bonnet gate valve screwed bonnet gate valve pressure seal bonnet and. Unique parallel slide forged cage unit design comprises all operating parts of the slide discs.

Weir valves controls usa inc. Split wedge disk consists of two solid pieces and holds together with the help of a special mechanism. 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. 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.

The split disk can be in a wedge shape or a parallel disk type. Gate valve body bonnet designs. Parallel slide gate valve provides a smooth flow path between seats. System pressure is used to provide isolation.

Consequently these components must be made of metals which do not gall or tear when in sliding contact with each other. Velan s proven pressure seal design. You can see the same in images. Gate valves use a gate or a wedge whilst butterfly valves use a rotating disc to allow or prevent fluid flow.