REGLERVENTIL INNEFATTANDE KOLVSLID MED AXIELLT SPAR

摘要

An axial slot with enlarged end openings is formed in a valve spool of a control valve having inlet, service and exhaust ports spaced axially along the valve spool bore. The axial slot always communicates with the service port and extends axially a sufficient distance to permit communication between all three ports as the valve spool is moved from its closed position to its open position. In the closed position one end of the slot is blocked and the other opens into the exhaust port. In the open position said one end of the slot is open to the inlet port and the other end of the slot is blocked from communication with the exhaust port. The valve provides rapid pressure rises in the service port during initial and final movements of the spool from its closed position to its open position.