Patent ID: 6347668
Filing Date: 2002-02-19
Classification: E21B

Abstract:
A relievable check valve assembly for oil wells and water wells comprising:a standing valve unit comprising a circular disc having a centered throughbore and a plurality of peripheral apertures, a bushing located within said centered throughbore, and a bell-shaped standing valve member having a threaded aperture; a guide pin having a head and a threaded shaft; and a trigger element having an upturned end with a decreasing width and a throughbore located at an opposite round end adapted for passing said guide pin sequentially through said trigger element, said centered throughbore of the circular disc and the bushing to attach to the bell-shaped standing valve member; whereby a conventional travelling valve unit travels down to contact and depress said guide pin to elevate the bell-shaped standing valve member for opening up a valve seat to allow any standing liquid to pass down in a down hole.