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A normally-open, solenoid-controlled valve includes a stationary valve-seat spindle and a cylindrical valve sleeve encircling and slideable along part of the valve-seat spindle. The valve-seat spindle has an annular control edge and the valve sleeve includes a pressure-responsive surface which is re

A normally-open, solenoid-controlled valve includes a stationary valve-seat spindle and a cylindrical valve sleeve encircling and slideable along part of the valve-seat spindle. The valve-seat spindle has an annular control edge and the valve sleeve includes a pressure-responsive surface which is reciprocably moved into and out of valve-closing contact with the control edge. The valve-seat spindle includes a flow passage therein extending to and discharging into a plenum region formed radially inward of the control edge between the spindle and the sleeve. The pressure-responsive surface of the valve sleeve is a substantially continuous frustrum of a cone whose apex extends in the direction of the valve opening and which extends radially outward from a sleeve inner diameter A to an outer diameter C (point C) of discontinuity in that surface. Point C is radially outward of the spindle and sleeve centerline at least as far as the point of intersection, B′, with that frustoconical pressure-responsive surface of a line normal to the surface and extending through the control edge D when the sleeve is fully-open. The minimum radial positioning of discontinuity point C is a function of the angle of the pressure-responsive surface and the stroke of the sleeve. The high pressure plenum is structured to enhance the valve-opening rate.

대표청구항 ▼

In a valve for controlling the flow of liquid between a high pressure supply and a relatively lower pressure drain, the valve comprising: a stationary valve-seat spindle having a first axial portion of one diameter and a second axial portion of greater diameter, an annular control edge of greater di

In a valve for controlling the flow of liquid between a high pressure supply and a relatively lower pressure drain, the valve comprising: a stationary valve-seat spindle having a first axial portion of one diameter and a second axial portion of greater diameter, an annular control edge of greater diameter than said first portion being formed on said second portion, said control edge having a radius D from the centerline of said spindle; a cylindrical valve sleeve closely encircling said first portion of said seat spindle in axial sliding relation therewith, said valve sleeve having a pressure-responsive surface and being slideably displaceable between a closed position having part of said pressure-responsive surface thereof in sealing contact with said seat control edge and a fully open position in which said pressure-responsive surface is spaced from said seat control edge axially in the direction of said seat spindle first portion; the valve-seat spindle including a flow passage having one end operatively connected to the supply of high pressure liquid and the other end discharging to a plenum region formed between said spindle and said sleeve and radially inward of said control edge; electromagnetic means operatively associated with said valve sleeve for moving said sleeve from said open to said closed position in response to electrical energization; and at least a part of said valve sleeve pressure-responsive surface being substantially a frustrum of a cone having its apex extending in the direction of valve opening, said frustoconical pressure-responsive surface being continuous from its point of contact B with said control edge D when closed to a point C radially outward of point B, point C being radially outward of the centerline of said spindle at least as far as the point of intersection B′with said frustoconical pressure-responsive surface of a line normal to said surface and extending through control edge D when said sleeve is in said fully open position.