Patent ID: 6796329
Filing Date: 2004-09-28
Classification: G05D,Y10T

Abstract:
A compact fluid pressure control valve solenoid including a gate valve comprising: outer and inner sleeves, said outer sleeve having ports connected thereto for the admission of pressurized fluid and the delivery of pressurized fluid from said pressure control valve to the work or back to a sump, said inner sleeve having formed therein at least a pair of fluid grooves, said outer sleeve acting in conjunction with said grooves in said inner sleeve to form passages for hydraulic fluid flow to said gate valve, and from said valve chamber,said inner sleeve having a main valving chamber, said gate valve being formed at one end of said main valving chamber, a main valving element in said main valving chamber, a main spring biasing said main valving element closed with the removal of the fluid from said main valving chamber through a vent port in said main valving chamber, a solenoid winding having an armature coupled to said gate valve element, a gate spring member biasing said gate valve element closed when said winding is deenergized, said main valve element having a piston head therein and arranged so that when said solenoid is energized, said gate valve opens to apply pressurized fluid to said piston head and open said main valving element and pass pressurized fluid to said work, said gate spring acting when said solenoid is deenergized to close said gate valve with the removal of fluid through the vent channel connected to said main valve chamber, thereby releasing the pressure on said main spring and thereby close said valve by moving said main valve element to a closed position.