MY120133A - Lift valve with pressure balanced pilot operated valve member - Google Patents

Abstract

A VALVE DEVICE COMPRISING A FIRST FLUID PORT (101), A SECOND FLUID PORT (102), A VALVE SEAT (119) DEFINING AN APERTURE THROUGH WHICH FLUID MAY FLOW FROM SAID FIRST PORT TO SAID SECOND PORT, A VALVE MEMBER (107), MOVEABLE RELATIVE TO SAID VALVE SEAT BETWEEN A SEATED POSITION AND A LIFTED POSITION. A CONTROL CHAMBER (103) IS FORMED AT LEAST IN PART BY SAID VALVE MEMBER, HAVING, A FIRST PASSAGEWAY (102) COMMUNICATING BETWEEN SAID CONTROL CHAMBER AND SAID FIRST PORT, AND, A SECOND PASSAGEWAY (106) COMMUNICATING BETWEEN SAID CONTROL CHAMBER AND SAID SECOND PORT. A CONTROL VALVE (117, 112) IS ASSOCIATED WITH AT LEAST ONE OF SAID PASSAGEWAYS TO PERMIT FLUID FLOW THERETHROUGH, AND TO THEREBY URGE SAID VALVE MEMBER INTO EITHER SAID SEATED OR LIFTED POSITION. A RESTRICTOR OR FLOW CONTROL ELEMENT (104) IS PROVIDED WITHIN THE FIRST PASSAGEWAY (102) TO RESTRICT THE FLOW OF FLUID THROUGH THE PASSAGEWAYS, AND, TO PREVENT INGRESS OF PARTICLES WHICH MIGHT OTHERWISE CLOG THE PASSAGEWAYS AND/OR FLOW PATHS DOWNSTREAM THEREOF. THE RESTRICTOR OR FLOW CONTROL ELEMENT (104) AUTOMATICALLY MOVES WITHIN THE PASSAGEWAY (102) WHENEVER THE VALVE DEVICE IS ACTIVATED AND/OR UNDER THE INFLUENCE OF FLUID MOVEMENT IN THE DEVICE, SUCH THAT, AS THE ELEMENT MOVES, THE PASSAGEWAY (102) IS CLEANED AND/OR CLEARED OF PARTICULATE MATTER SUCH AS DIRT AND/OR OTHER DEPOSITS.