Poppet Type Valves
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comatrol hydraulic cartridge valves

Poppet-type solenoid valves are two-way, normally open or normally-closed valves.

 

Normally-closed
Normally-closed poppet valves block flow from 2 to 1 when de-energized. When the solenoid coil is energized, magnetic force lifts the small pilot dart from it’s seat, creating a pressure differential across the main poppet that provides the force to lift the main poppet off it’s seat. Models with free-reverse-flow also act as a low-pressure, free-flow check valve from 1 to 2 when energized; standard models provide an orifice-connection to 2 when pressure is applied at 1.

 

solenoid-normally-closed-dimensions

 

Normally-open

Normally-open poppet valves provide free flow from 2 to 1 when de-energized. When the solenoid coil is energized, magnetic force seats the small pilot dart, creating a pressure differential that provides the force to seat the main poppet and block flow.

Models with free-reverse flow also act as a low-pressure, free-flow check valve from 1 to 2 when de-energized; standard models provide an orifice-connection to 2 when pressure is applied at 1.

 solenoid-normally-open-dimensions

 

Applications

Common applications for normally-open and normally-closed poppet valves include:

  • Load holding and lowering with single-acting cylinders.
  • Unloading of a fixed-displacement pump.
  • Use in combination to duplicate four-way, three-position valve functions. These circuits create low-cost, compact alternatives to subplate- or stack-type directional control valves. As an added advantage these poppet valve circuits do not need load holding checks as the poppets provide the same low-leakage function.

 

solenoid-schematic  solenoid-pump-unloading


solenoid-4way-3pos-dvc

 

Bi-directional Poppet-Type Solenoid Valves

Bi-directional poppet-type solenoid valves are two-way, normally open or normally-closed valves. The poppets are pressure-balanced so that the spring holds the poppet in it’s de-energized position. When the solenoid coil is energized, magnetic force overcomes the spring and causes the poppet to shift.

 

Normally-closed
Normally-closed bi-directional poppet valves block flow in both directions when de-energized and allow freeflow when energized. These valves are typically used as directional controls for single-acting cylinders or uni-directional motors where low-leakage load holding is required, or where multiple functions must be separated.

 solenoid-ind-cylinder

 

 

solenoid-normally-closed-bi-poppet

 

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