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US 6,802,330 B2Granted
Auto-relieving pressure modulating valve
AssigneeMico Co., Ltd.
InventorStephen Dale Royle
Life of this patent
Estimating the term…
Abstract
An auto-relieving pressure modulating valve includes a spool, a solenoid that shifts the spool in an energized direction, and a spring arrangement. The spring arrangement functions to shift the spool from a relieving position to a neutral position, in the energized direction, without energizing the solenoid.
Claims5
A method of controlling fluid flow in a valve arrangement, the valve arrangement including a valve body having a pressure port, a work port, and a tank port, a solenoid device coupled to the valve body, and a spool operably coupled to the solenoid device, the method comprising:
- (a) pressurizing the work port by energizing the solenoid device and moving the spool a first distance from a neutral position to a pressurized position;
- (b) relieving the work port by de-energizing the solenoid device and moving the spool a second distance to a relieving position, the second distance being greater than the first distance, the valve arrangement being configured to provide a first gap for fluid communication between the work port and the tank port when the spool is in the relieving position, the first gap of the valve arrangement having a first cross-sectional area;
- and
- (c) moving the spool, without energizing the solenoid device, from the relieving position to the neutral position, the valve arrangement being configured to provide a second gap for fluid communication between the work port and the tank port when the spool is in the neutral position, the second gap of the valve arrangement having a second cross-sectional area, the first cross-sectional area of the first gap being greater than the second cross-sectional area of the second gap.
1 more element
Dependencies are inferred from the claim text.