Solenoid operated valve with hydraulic dampening
AssigneeEaton Corporation
InventorsSteven L. Ambrose, Carl G. Gluf JR., John A. Ness, Danny M. Smith
Life of this patent
Estimating the term…
Abstract
A solenoid operated pressure balanced spool type pressure control valve for controlling flow between a pressure source inlet and a signal pressure outlet and between the signal pressure outlet and an exhaust or sump return port. the spool has metering orifices formed in pressure equalization flow passages through the spool. The metering orifices preferably comprise three orifices having a diameter in the range of about 0.50-0.76 mm for providing viscous dampening of the flow through the spool and dampers oscillations of the spool and armature due to hydraulic and/or electrical transients.
Claims11
A method of dampening a solenoid operated valve comprising:
- (a) forming a valving bore in a valve body and porting the bore therealong for a pressure supply inlet, a control signal outlet and an exhaust outlet;
- (b) disposing a spool in the bore and forming a flow passage axially through the spool, and effecting pressurization equalization on the opposite ends of the spool and disposing a metering orifice in the flow passage;
- (c) disposing a solenoid with a moveable armature on said body and energizing the solenoid and moving the spool by contact with the armature and controlling flow from the inlet to signal outlet to the exhaust outlet;
- and,
- (d) limiting flow of fluid through said flow passage with said orifice and damping the movement of the spool and armature.
The method defined in claim 5, wherein the step of valving flow between the signal outlet and the exhaust outlet includes forming a valve seat and moving a member attached to the armature with respect to the valve seat.
A solenoid operated valve assembly comprising:
- (a) a valve body having a valving bore ported therealong in axially spaced arrangement to an inlet port, a signal outlet port and an exhaust port;
- (b) a spool disposed in said bore and slidably moveable therein;
- (c) a valve seat disposed between said signal outlet port and said exhaust port and operative for exclusively communicating therethrough flow to the exhaust port;
- (d) a solenoid attached to the body and having therein an armature moveable in response to electrical energization thereof and including a member moveable with respect to the valve seat for controlling flow therethrough;
- (e) a portion of said spool contacted by said member for movement thereby and operative for controlling flow from the inlet port to the valving bore;
- and,
- (f) a pressure equalization passage formed axially through said spool and including a metering orifice therein operable for limiting flow therethrough and dampening movement of the spool.
Dependencies are inferred from the claim text.