Abstract: A high pressure multi-stage valve having a pair of opposing plates, one of which has a central flow port, the plates having annular interdigitated teeth and grooves and providing for sinuous path for flow of fluid from the port to the peripheries of said plates to provide for multi-stage expansion in a single pass between the interdigitated teeth. The magnitude of interdigitation can be adjusted. The teeth are of annular form and are of truncated triangular shape in cross section and the grooves are of complementary shape. In one form of the invention, at least a substantial number of the teeth are of the same cross sectional dimensions, and the angles of the side of each tooth to the vertical are the same to provide for equal depth flow legs between the opposing sides of adjacent teeth. In another form of the invention the angularity of the sides of the teeth change in a regular pattern from the axis outward.

Abstract: A multiple stage valve wherein the valve body provides plural axially spaced seats defining at least in part a flow passageway. A valve member is disposed in said passageway and has plural spaced valve elements cooperatively related to said plural seats. One or more webs on said valve member establish a guided relationship of said valve member to said seats at assembly, during operation, and in relation to fluid flow.

Abstract: A multi stage valve(1) having a valve member actuating mechanism located on the wide side of the valve member;(2) having a valve member and seat equipped with plural steps of increasing diameter in an upstream direction;(3) wherein the steps are configured so that a straight line can extend between opposed steps in all open positions of the valve;(4) wherein the steps are configured so that the flow passage varies in width, being narrowest at the zones of opposed steps;(5) wherein the movement of the valve member is of a magnitude equal to the width of plural steps;(6) having a movable assembly which includes the valve member and its actuating mechanism adapted for ready reception by valve bodies of various configurations;(7) having an arrangement for balancing the pressure across the valve member when it is closed;(8) having an arrangement for exteriorly showing the exact position of the valve member at all times;(9) having other features as recited herein.

Abstract: A valve constructed such that the part of the valve member actuating mechanism, which is located within the valve, is sealingly isolated from the flow passageway by an arrangement including a chamber whose volume changes upon movement of the valve member. A movable interface is provided between the chamber and the flow passageway, and is moved upon increases or decreases in the volume of the chamber, in the appropriate direction, to compensate for such volume changes. The valve may have a device for injecting a lubricant into the chamber and for contact with the interface.

Abstract: A high pressure multistage valve in which a multiflanged plug is shiftable vertically within a passage provided by a stack of encircling rings, which can be readily exchanged or replaced. A turnable stem effects linear movement of the plug via a motion converting mechanism located in the interior of the valve. A lubricating system for the mechanism has a movable interface with the fluid being controlled.