This valve provides positive shut off. The shut off assembly comprises of a metal piston, two resilient valve rings and a metal lantern bush. The sealing surface consists of the outer vertical surface of the piston and the corresponding inner surfaces of the sealing rings. This provides a large sealing surface compared to globe valves of conventional design.
Piston valve is of two types, balanced and unbalanced. Balanced valve is used in high pressure services and unbalanced one for low pressure services.
The body is normally of cast construction. It can have screwed ends, flanged ends or butt welding ends. These valves follow the regulatory codes to DIN. There are no API or ANSI standards covering the piston valves. The end to end dimensions are to DIN 3202 which is more than a gate or globe valve of the same size to API/ASME/ BS standards. Of late, the Piston Valves are also made to ASME B16.10 dimensions. The end connections are also available to ASME/ BS standards.
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