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Class Information
Number: 137/315.21
Name: Fluid handling > With repair, tapping, assembly, or disassembly means > Assembling or disassembling rotary valve > Rotary ball valve > Particular valve seat or interface seal > Replaceable > With top entry valve

Patents under this class:

Patent Number Title Of Patent Date Issued
8656942 Length-adjustable pressure-retaining piping components Feb. 25, 2014
8365755 Ball valve isolator Feb. 5, 2013
6938876 Ball valve with retractable seals and method of replacement thereof Sep. 6, 2005
5954088 Ball valve adapted to couple with an output drive shaft of a valve control device Sep. 21, 1999
5551479 Combination ball and check valve Sep. 3, 1996
5531244 Hemispherical ball valve Jul. 2, 1996
5313976 Top entry ball valve and method of assembly May. 24, 1994
5251657 Top-entry check valve with cartridge secured by projections Oct. 12, 1993
5117858 Top entry ball valves with cam adjustable seats Jun. 2, 1992
4953587 Ball valves for pipelines Sep. 4, 1990
4867414 Ball valve Sep. 19, 1989
4641681 Clamp for use with top entry ball valve Feb. 10, 1987
4635675 Flat sided ball valve Jan. 13, 1987
4632140 Top entry ball valve Dec. 30, 1986
4601308 Ball valve with seat loading mechanism Jul. 22, 1986
4566482 Top entry trunnion ball valve Jan. 28, 1986
4390039 Valve assembly and disassembly device Jun. 28, 1983
4388945 Valve assembly and disassembly device Jun. 21, 1983
4342330 Ball type valve having improved redundant sealing system Aug. 3, 1982
4262691 Cam means for ball valve seat rings Apr. 21, 1981
4217923 Ball valve with readily removable ball and seats for high temperature environment Aug. 19, 1980

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