Taking The Mystery Out Of Hydraulic Valves -Poppet-Type Directional Valves Poppet-Type Directional Valves At the most fundamental level, there are two kinds of hydraulic directional valves, those that control hydraulic fluid flow by moving a spool within a bore to selectively connect different ports, and those that control the flow with a poppet or poppets. Part 2 of this series discusses poppet-type valves. In case you missed it, remember to check out Part 1 of the series, where we discussed spool-type hydraulic directional valves. In a hydraulic poppet-type valve, incoming fluid is routed through an internal opening which is closed by the poppet mechanism, typically a spring and/or hydraulically-loaded ball or conical plug. Hydraulic fluid flow through the valve is controlled by the opening or closing of the poppet, which may be accomplished with a lever or other mechanical device, hydraulic or pneumatic pressure, a solenoid, or a combination of methods. In a normally closed configuration, the poppet is held against the seat by spring force and/or pressure. Moving the poppet through mechanical force, application of pressure, or venting of pressure opens the flow path from inlet to outlet. In a normally open configuration, the normal state and sequence are reversed and the actuation force closes the poppet.
Posted on: Thu, 18 Jul 2013 07:01:45 +0000
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