Bifaced gate valve having tapered seat sealing surfaces

• US 3,152,786 A
• Filed: 03/01/1961
• Issued: 10/13/1964
• Est. Priority Date: 03/01/1961
• Status: Expired due to Term

• Current Assignee: James M. Harwell Jr, John D Watts, Paul B. Soderberg
• Original Assignee: James M. Harwell Jr, John D Watts, Paul B. Soderberg
• Inventors: Soderberg, Paul B., Watts, John D., Harwell, James M. Jr.
• Application Number:
  US04/092,623
• Time in Patent Office: 1,322 Days
• US Class Current: 251/167
• CPC Class Codes: F16K 3/186 by means of cams of wedge from
• CPC Class Codes: Y10T 137/6161 With provision of alternate wear parts

Claims

1. VALVE COMPRISING:

HOUSING MEANS DEFINING A VALVE CHAMBER, SAID HOUSING MEANS HAVING AN INLET PASSAGE AND A DISCHARGE PASSAGE COMMUNICATING WITH SAID CHAMBER;

A FIRST FRUSTO-CONICAL SEALING SURFACE DISPOSED ABOUT ONE OF SAID PASSAGES, SAID SURFACE BEING CARRIED BY REMOVABLE VALVE SEAT MEANS;

A SEALING MEMBER CARRIED WITHIN SAID VALVE CHAMBER ADJACENT SAID FIRST SEALING SURFACE, SAID SEALING MEMBER HAVING A SECOND FRUSTO-CONICAL SEALING SURFACE THEREON, THE INCLUDED ANGLE OF TAPER OF SAID SECOND SEALING SURFACE MEASURED FROM A LINE PARALLEL TO THE AXIS OF SAID FIRST AND SECOND SEALING SURFACES BEING LESS THAN THE INCLUDED ANGLE OF TAPER OF SAID FIRST SEALING SURFACE, ONE OF SAID SEALING SURFACES BEING DEFLECTABLE BY THE OTHER UPON MOVEMENT OF SAID SEALING MEMBER FROM A FIRST POSITION SPACED FROM SAID FIRST SEALING SURFACE TO A SECOND POSITION IN WHICH SAID DEFLECTABLE SEALING SURFACE IS IN STRESSED SEALING ENGAGEMENT WITH THE OTHER SEALING SURFACE, THE INTERNAL ENERGY CREATED IN SAID DEFLECTABLE SURFACE BY MEANS OF ITS DEFLECTION BEING UTILIZED TO MAINTAIN AN EFFECTIVE SEAL AND TO PREVENT FLUID FLOW THROUGH SAID ONE PASSAGE;

A FLEXIBLE LIP ON SAID REMOVABLE VALVE MEANS HAVING A THIRD FRUSTO-CONICAL SEALING SURFACE THEREON, SAID HOUSING MEANS HAVING A FOURTH FRUSTO-CONICAL SEALING SURFACE AROUND SAID ONE PASSAGEWAY AND COAXIAL WITH SAID THIRD SEALING SURFACE, THE INCLUDED ANGLE OF TAPER OF SAID THIRD SEALING SURFACE MEASURED FROM A LINE PARALLEL TO THE AXES OF SAID THIRD AND FOURTH SEALING SURFACES BEING NORMALLY LESS THAN THE INCLUDED ANGLE OF TAPER OF SAID FOURTH SEALING SURFACE, SAID LIP BEING DEFLECTED WHEN SAID VALVE SEAT MEANS IS SECURED TO SAID HOUSING MEANS BY ENGAGEMENT WITH SAID FOURTH SEALING SURFACE, THE INTERNAL ENERGY CREATED IN SAID DEFLECTABLE LIP BY MEANS OF ITS DEFLECTION BEING UTILIZED TO MAINTAIN AN EFFECTIVE SEAL BETWEEN SAID VALVE SEAT MEANS AND SAID HOUSING MEANS;

VALVE OPERATING MEANS JOINED TO SAID SEALING MEMBER FOR EFFECTING SAID MOVEMENT OF THE LATTER;

AND MEANS FOR PREVENTING OVER-DEFLECTION OF THE DEFLECTABLE SURFACE WHICH FORMS THE SEAL BETWEEN SAID SEALING MEMBER AND SAID VALVE SEAT MEANS, SAID PREVENTING MEANS INCLUDING SHOULDERS ON SAID HOUSING MEANS AND ON SAID SEALING MEMBER WHICH POSITIVELY ABUT ONE ANOTHER WHEN SAID SEALING MEMBER IS IN SAID SECOND POSITION.