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Piston Type Valves

Piston Type Valves Points : Piston Type Valves, Definition Most valves in hydraulically operated machines are of the plunger or piston type. A given port is closed, that is, the oil is shut off from entering that port, by the” hand “of the plunger, and the connection (opening) between adjacent ports is made by the spaces or spools between the lands. The ports or either annular grooves (recesses) bored or cored in the surrounding valve chamber, or radial holes drilled in from grooves turned in a surrounding bushing. b. In order that the valve may work freely, it is necessary to have the oil pressure even (balanced), and this the case with plunger-type valves.

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