Patent ID: 7810518
Filing Date: 2010-10-12
Classification: F16K,Y10T

Abstract:
1. A solenoid-operated valve comprising: an inlet valve member which is disposed to close in response to fluid pressure at an inlet port; a venting valve member which is disposed relative to said inlet valve member so that closure of either valve member lifts the other; at least one electrical coil; a tubular assembly disposed within said coil, said tubular assembly forming a chamber with an operating space for said venting valve member and containing an armature for striking a rear part of said venting valve member when said coil is energised; wherein said chamber includes a flux tube which provides a path for magnetic flux in parallel with said armature, said flux tube terminating before a region where the armature strikes said rear part of the venting valve member, and a non-magnetic ring surrounding said region so that the density of said magnetic flux is increased in said region to increase the force with which the armature can strike said rear part of the venting valve member.