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A test valve is positioned to block off a primary fluid pressure source acting on a pilot valve means and to provide communication with an alternate test fluid pressure source for testing the pilot valve means. The test valve has a central bore in which a depressible plunger is positioned for longit

A test valve is positioned to block off a primary fluid pressure source acting on a pilot valve means and to provide communication with an alternate test fluid pressure source for testing the pilot valve means. The test valve has a central bore in which a depressible plunger is positioned for longitudinal movement between a seated extended position blocking the primary fluid pressure source and simultaneously commmunicating test fluid to pilot valve means, and an unseated retracted position in which the alternate fluid pressure source is sealed and blocked by an annular sealing member. The plunger has the annular sealing member adjacent its inner end in sealing contact with the adjacent surface forming the bore and positioned inwardly of a discharge passage in the plunger for the alternate fluid source. A hollow detachable stinger member which seats the plunger provides the test fluid and has a manual control thereon which selectively supplies the test fluid to the test valve.

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A test valve structure for closing a first fluid pressure source acting on a valve means and communicating an alternate fluid pressure source to act on the valve means for testing the valve means comprising: a. a test valve for positioning between the first fluid pressure source and the valve means

A test valve structure for closing a first fluid pressure source acting on a valve means and communicating an alternate fluid pressure source to act on the valve means for testing the valve means comprising: a. a test valve for positioning between the first fluid pressure source and the valve means to be tested, said test valve including a body having fluid inlet and outlet passageways both passageways communicating with a valve chamber having a valve seat therein; b. an elongated housing secured to said body and having a central bore therein in fluid communication with the valve chamber, said central bore having enlarged diameter inner and outer bore portions connected by a small diameter intermediate bore portion; c. a plunger within the central bore having an end portion fitting closely within the small diameter intermediate bore portion and a valve member on its inner end within the enlarged diameter inner bore portion, said plunger being movable between a projected seated portion of the valve member oN the valve seat within the valve chamber to block fluid flow between the inlet and outlet passageways and a retracted unseated position of the valve member permitting fluid flow between the inlet and outlet passageways; d. a spring mounted within the upper bore portion and urging the plunger continuously into an unseated portion in which the flow of fluid is maintained between the inlet and outlet passageways through the valve chamber, said plunger having a fluid inlet passage adjacent its outer end and a discharge passage adjacent its inner end at the adjacent intermediate bore portion, and e. an annular sealing member about the plunger between the discharge passage and the valve member and sealing between the plunger and the intermediate bore portion in the retracted position of the plunger, said annular sealing member and said discharge passage being positioned within the inner enlarged diameter bore portion when the valve member is seated in projected position of the plunger.