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Parallel Gate Valves

A gate valve is a type of slide valve that uses a flat or curved disc perpendicular to the process flow. The disc [photo - right] slides into the flow stream to provide shut-off. The fluid pressure acting on the disc is sufficient to produce a satisfactory seal between metal-to-metal seatings.

The surfaces of the disc in contact with the guides and the leading edge are coated with a cobalt-based material applied through a plasma transfer arc process. This coating reduces erosion caused by suspended particles transported by the fluid.

One advantage of parallel gate valves is their low resistance to flow, which minimizes pressure drop across the valve.

Parallel gate valves can be used in liquid or gas services to isolate the expander outlet line or the reactor-to-fractionator tower. They can handle either fluid or gas carrying solids in suspension.

The body of the valve is made of SA 516 Gr 70 carbon steel lined with refractory material and is capable of operating at temperatures up to 950 °C. Valve internals, disc guides and stem are made of SA 240 Tp 304 H stainless steel.

Gate valves can use an electric, hydraulic or pneumatic actuator and they are supplied complete of a purging system to prevent any solid materials build-up.

Copyright © REMOSA spa 1998-2008 Last updated on January 28th, 2008