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Class Information
Number: 137/329.02
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
Description: Devices having oppositely disposed duplicate surfaces forming a unitary structure.

Sub-classes under this class:

Class Number Class Name Patents
137/329.03 Homogeneous material 7

Patents under this class:

Patent Number Title Of Patent Date Issued
8701553 Valve system Apr. 22, 2014
8517046 Redundant metal-to-metal seals for use with internal valves Aug. 27, 2013
8333213 Valve system Dec. 18, 2012
4776365 Non-turbulent shut-off valve Oct. 11, 1988
4736766 Flow shut-off valve Apr. 12, 1988
4645179 Gate valve seal system Feb. 24, 1987
4432387 Rotating disc gate valve Feb. 21, 1984
4376448 Let-down valve Mar. 15, 1983
4304254 Dust trap valve with removeable double-life door and valve seat member Dec. 8, 1981
4257442 Choke for controlling the flow of drilling mud Mar. 24, 1981
4190073 Choke for controlling the flow of drilling mud Feb. 26, 1980

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