Flow control valves

Claim 1

A FLOW CONTROL VALVE COMPRISING A HOUSING HAVING AN ELONGATED FLUID PASSAGE THEREIN, AN INLET OPENING AND AN OUTLET OPENING IN SAID PASSAGE, A VALVE BODY AXIALLY MOVABLY ARRANGED IN SAID PASSAGE, CYLINDRICAL THROAT MEANS DISPLACED FROM SAID OUTLET OPENING IN SAID PASSAGE, SAID VALVE BODY HAVING A CIRCUMFERENTIAL CLEARANCE IN SAID PASSAGE TO ALLOW FLUID FLOW BETWEEN SAID OPENINGS ALONG THE EXTERIOR OF SAID VALVE BODY, CIRCUMFERENTIAL LAND MEANS ON SAID VALVE BODY DISPLACEABLE INTO SAID THROAT MEANS, SAID LAND MEANS HAVING A TIGHT ENOUGH FIT IN SAID THROAT MEANS TO CAUSE RESISTANCE TO FLUID FLOW ALONG THE EXTERIOR OF SAID LAND MEANS IN DEPENDANCE ON THE DEPTH OF PENETRATION OF SAID LAND MEANS INTO SAID THROAT MEANS, RESILIENT MEANS IN SAID HOUSING BEARING AGAINST SAID VALVE BODY TO RESIST PENETRATION OF SAID LAND MEANS INTO SAID THROAT MEANS, AND MEANS ON SAID VALVE BODY FOR PRODUCING UNDER ADMITTANCE OF FLUID FLOW FROM SAID INLET OPENING TO SAID OUTLET OPENING A PRESSURE DROP EFFECTIVE AGAINST SAID VALVE BODY AND TENDING TO DISPLACE SAID LAND MEANS INTO SAID THROAT MEANS AGAINST THE RESISTANCE OF SAID RESILIENT MEANS.