Flow control valve with enhanced flow control piston

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 3/34 (2006.01) G05D 7/01 (2006.01)

Patent

CA 2174091

A flow control valve (10) is provided including a valve body (20) and a piston (16). The valve body (20) has extending therethrough a longitudinal bore (18) defining a first flow passage (32). The piston (16) is slidably disposed within the bore (18) to vary the flow area of a fluid flow through the control valve (10). The piston (16) contains a second flow passage (28) defined by a side wall (68) and an end wall (70). The side wall (68) has at least one longitudinal flow channel (24) with a first orifice (26) extending therethrough. The piston (16) preferably slides within the longitudinal bore (18) to vary the flow area of the first flow passage (32) such that the fluid flow through the control valve (10) is substantially constant over a selected range of pressure differentials across the control valve (10).

L'invention décrit une soupape de régulation de l'écoulement (10) avec un corps de soupape (20) et un piston (16). Le corps de soupape (20) est traversé par un alésage longitudinal (18) qui définit un premier passage pour l'écoulement (32). Le piston (16) est disposé de façon coulissante dans l'alésage (18) afin de faire varier l'aire d'écoulement d'un fluide qui traverse la soupape de régulation (10). Le piston (16) contient un second passage d'écoulement (28)défini par une paroi latérale (68) et une paroi d'extrémité (70). La paroi latérale (68) comporte au moins un canal d'écoulement longitudinal (24) traversé par un premier orifice (26). Le piston (16) coulisse de préférence à l'intérieur de l'alésage longitudinal (18) afin de faire varier l'aire d'écoulement du premier passage d'écoulement (32) de telle sorte que l'écoulement de fluide à travers la soupape de régulation (10) soit sensiblement constant dans une plage choisie de différentiels de pression agissant sur la soupape de régulation (10).

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