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Check valves with disc-type closure elements 2012-01-04
The field of art to which the present invention pertains includes check valves with disc-type closure elements pivotally
Ball check valve 2011-12-31
An improved ball check valve for use in positive displacement subsurface pumps used in the petroleum industry for pumpin
Check valve basic of parts 2011-12-30
A check valve having a body with an inlet, an outlet, a valve seat surrounding communication between said inlet and said
Check valve 2011-12-29
In the check valve having a valve seat member and the valve member, the valve seat member is provided with first and sec
A corrosion resistant check valve 2011-12-28
A corrosion resistant check valve having plastic components in the fluid path is provided. The check valve broadly compr
Vibration of check valve causing noise 2011-12-27
The check valve according to the invention has an advantage over the prior art that the ball, at the ends of the check v
An improved check valve 2011-12-26
Prior check valve arrangements are not deemed to be sufficiently sensitive to small differential pressures, i.e., cracki
More particularly to an improved check valve 2011-12-23
The invention is particularly applicable to a valve that is extremely sensitive to low cracking pressures and will be de
