Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1985-01-18
1986-08-12
Scott, Samuel
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 65, 25112908, 25112917, 25112919, 335229, 335234, 310 14, 310 30, 13762561, 13762564, F16K 3142
Patent
active
046051970
ABSTRACT:
A proportional pressure control device having a motor with a housing and a reciprocably movable armature oriented in the housing for movement between first and second limit positions. A valve body is secured to the motor housing. A platelike poppet valve member is secured to the armature on at least one end thereof. The valve body has a fluid pressure port thereon and it extends into the interior of the valve body to a chamber. A flow restrictor device is provided in the pressure port to restrict fluid flow from an external pressure source into the pressure port and the chamber. A nozzle outlet structure is provided in the chamber and has an annular flat valve seat thereon directly opposing the poppet valve member. The spacing between the valve seat and the poppet valve member effects a controlling of the magnitude of the fluid pressure developed in the chamber. Structure is provided for effecting a movement of the armature in a manner that is substantially proportionally related to the current signal between a position of the armature at the aforesaid first limit position and a position of the one side of the poppet valve member whereat it engages the valve seat. In addition, magnetic latching structure is provided for releasably magnetically holding the armature in at least the second limit position for the armature. Compensating structure is provided between the poppet valve and the armature to permit continued travel of the armature after the poppet valve seats.
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Brochure entitled "Proportional Pressure Control", FEMA Corp., 9/77.
Casey Gerald F.
Schultz Richard A.
Fema Corporation
Flanigan Allen J.
Scott Samuel
LandOfFree
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