Importance

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Abstract

A mudsaver valve for insertion into the upper end of a well casing includes an elongated cylindrical valve body member having a central bore for receiving an elongated generally tubular valve closure member for movement in the body bore between valve closed and open positions. Passages in the closure member open to the outer surface thereof and spaced apart seal members mounted on the closure member prevent fluid flow out of the valve when the closure member is disposed in a closed position in the body. The body supports plural circumferentially spaced spring biased drag blocks or radially deflectable leaf or bow spring members which are engageable with the casing to support the body stationary in the casing so that the closure member may be reciprocated with respect to the body between valve open and closed positions.

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First Claim