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An apparatus and method for generating a high-speed pulsed fluid jet wherein the apparatus has a valve cylinder that forms a valve cavity. A piston is slidably mounted within the valve cavity. A plunger with an internal chamber is fixed with respect to the piston. The internal chamber communicates w

An apparatus and method for generating a high-speed pulsed fluid jet wherein the apparatus has a valve cylinder that forms a valve cavity. A piston is slidably mounted within the valve cavity. A plunger with an internal chamber is fixed with respect to the piston. The internal chamber communicates with the valve cavity. An end plug is sealably mounted with respect the plunger. The end plug has a bore through which a valve stem is sealably and slidably mounted. The valve stem is mounted to slide within the internal chamber, the bore of the end plug and a valve chamber of a cylinder. The valve chamber communicates with a pressurized fluid source. A valve poppet is attached to the valve stem. A spring or compressed gas is used to exert a bias force which normally urges the valve poppet into a releasable seated position within a valve port of an end plug which is sealably mounted with respect to a fluid cylinder that forms the valve chamber.

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[ I claim:] [1.] An apparatus for converting continuous fluid flow to intermittent fluid flow, the apparatus comprising:a valve cylinder having a cylindrical cavity, a piston slidably and sealably mounted within said cavity, an energy storage device urging said piston in a first direction, a plunger

[ I claim:] [1.] An apparatus for converting continuous fluid flow to intermittent fluid flow, the apparatus comprising:a valve cylinder having a cylindrical cavity, a piston slidably and sealably mounted within said cavity, an energy storage device urging said piston in a first direction, a plunger having a cylindrical internal chamber, said plunger having a first end portion fixed with respect to said piston and a second end portion opposite said first end portion, an end plug sealably mounted with respect to said second end portion, said end plug having a plug bore;a fluid cylinder having a valve chamber in communication with a pressurized fluid source;a valve stem slidably mounted within said internal chamber, said plug bore and said valve chamber, said valve stem having a shoulder positioned within said internal chamber;a valve poppet attached to said valve stem opposite said shoulder;an outlet plug sealably mounted with respect to said fluid cylinder, said outlet plug having a discharge passage with one end exposed to said valve chamber and an opposite end exposed to an exterior of said outlet plug; anda spring mounted between said plunger end plug and said valve poppet.