Plastic lined plug valve

• US 3,916,943 A
• Filed: 08/27/1973
• Issued: 11/04/1975
• Est. Priority Date: 08/27/1973
• Status: Expired due to Term

• Current Assignee: NDT & Corrosion Control Services Incorporated
• Original Assignee: Burleigh R. Murphree, Clarence H. Hester, Gail W. Graves, Joseph T. Stewart Jr, Willard L. Petrosky
• Inventors: Petrosky, Willard L., Stewart, Joseph T. Jr., Graves, Gail W., Hester, Clarence H., Murphree, Burleigh R.
• Primary Examiner(s): Schwadron, Martin P.
• Assistant Examiner(s): Miller, Robert J.
• Application Number:
  US05/392,031
• Time in Patent Office: 799 Days
• Field of Search: 137/375 264/127,269 251/359,360,214,363,314,315,309,316,317
• US Class Current: 137/375
• CPC Class Codes: F16K 27/062 with conical plugs
• CPC Class Codes: F16K 5/025 Particular coverings or materials
• CPC Class Codes: F16K 5/163 adjustable in height
• CPC Class Codes: F16K 5/166 Means pressing on the large diameter
• CPC Class Codes: Y10T 137/7036 Jacketed

Abstract

A plug valve with a body having an inlet and an outlet with a tapered rotatable plug between the inlet and the outlet. The plug and valve body lined with a thermoplastic coating. Separate replaceable sealing valve seats are provided about the inlet and the outlet which can be replaced in the event that the seat becomes worn without the necessity of scrapping the valve body or plug. The seals including seating surfaces shaped to coact with the conical plug and spaced from the valve body and toward the valve plug whereby the plug will contact only the seals to provide a lower operating torque, better sealing, and direct wear to the seals. Adjustable means are provided for holding the valve plug in a sealing relationship with the seals.

Claims

1. A plastic lined plug valve comprising, a body having an inlet and an outlet, a plug valve element positioned in the body between the inlet and the outlet, said valve element including a conical section, the entire interior of the body including the inlet and the outlet and the exterior of the plug valve element being coated with a thermoplastic coating, a replaceable seal in the body adjacent and encircling each of the inlet and the outlet inside of the valve body coating, each of said seals including a tubular body having a seating surface at one end of the tubular body shaped to coact with the surface of the conical section of the valve element, said seating surfaces spaced from the coating on the valve body and toward the element for preventing engagement between the coating on the body and the coating on the element, and means urging the valve element into a sealing relationship with said seals.

2. A plastic lined plug valve comprising, a body having a longitudinal axis and including an inlet and an outlet coaxially aligned with the body axis, a rotatable plug valve element positioned in the body between the inlet and the outlet and including a conical section, the axis of the valve element being generally perpendicular to the body axis, the entire interior of the body and the exterior of the plug valve element including a thermo-plastic coating, a replaceable fluorocarbon plastic seal in the body adjacent and encircling each of the inlet and the outlet and positioned between the coating on the body and the coating on the valve element, each of said seals including a tubular body coaxially aligned in the body and having a seating surface on one end of the tubular body shaped to coact with the surface of the conical section of the valve element, said seating surfaces spaced from the coating on the interior valve body and toward the valve element whereby the element will contact the seals instead of the valve body, said coating in the valve body including a circular notch about and against each of the inlet and the outlet and the second ends Of each of the tubular seals positioned in one of said notches, and adjustable means including an adjusting ring acting against the valve element for longitudinally holding the valve element into a sealing relationship with the seals.