Fluid flow control valve

Claim 1

A FLUID FLOW CONTROL VALVE FOR PROVIDING A CONTINUOUS LOW VOLUME FLOW FO FLUID AT RELATIVELY LOW PRESSURE COMPRISING A FLUID CONDUIT FORMING A PASSAGE FOR THE FLUID, A RESILIENT SLEEVE ENCOMPASSING THE PASSAGE WITHIN THE CONDUIT AND HAVING AN ELONGATED CYLINDRICAL BORE, A LONGITUDINALLY MOVABLE CYLINDRICAL STEM HAVING AN ELONGATED END PORTION RECEIVED IN SAID SLEEVE AND RESILIENTLY GENGAGED THEREBY, SAID SLEEVE AND STEM PORTIONS BEING COMPLEMENTALLY PROPORTIONED TO SEAL OFF FLUID FLOW THROUGH THE PASSAGE SOLELY BY RESILIENT GRIPPING ENGAGEMENT OF SAID STEM PORTION BY SAID SLEEVE BORE THROUGHOUT ENGAGED CYLINDRICAL AREAS OF SUBSTANTIAL LENGTH, SAID SLEEVE AND STEM HAVING PORITONS OF THEIR ENGAGED SURFACES FORMED TO DEFINE A LONGITUDINALLY EXTENDING FEED CHANNEL OF LIMITED LENGTH AND LONGITUDIANLLY VARYING CROSS SECTION, AND MEANS FOR MOVING THE STEM LONGITUDINALLY OF THE SLEEVE TO CLOSE THE CHANNEL AND THEREBY SEAL OFF FLUID FLOW THROUGH SAID PASSAGE OR TO OPEN A PORTION OF THE CHANNEL AND THEREBY ESTABLISH COMMUNICATION BETWEEN THE UPSTREAM AND DOWNSTREAM SIDES OF SAID SLEEVE..