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Class Information
Number: 137/329.03
Name: Fluid handling > With repair, tapping, assembly, or disassembly means > With provision of alternate wear parts > Valve heads and/or seats > Opposite duplicate surfaces of unitary structure > Homogeneous material
Description: Devices relating to an homogeneous material forming the surfaces and their intermediate support.

Sub-classes under this class:

Class Number Class Name Patents
137/329.04 Valve heads 15

Patents under this class:

Patent Number Title Of Patent Date Issued
6401747 Gate valve Jun. 11, 2002
4909272 Gate valve Mar. 20, 1990
4393928 Apparatus for use in rejuvenating oil wells Jul. 19, 1983
4355784 Method and apparatus for controlling back pressure Oct. 26, 1982
4257442 Choke for controlling the flow of drilling mud Mar. 24, 1981
4243067 Ball type check valve Jan. 6, 1981
4190073 Choke for controlling the flow of drilling mud Feb. 26, 1980

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