Fluid Actuated Valve Assembly

摘要

1,190,356. Fluid-pressure servosystems. BENDIX CORP. Feb.19, 1969 [March 7, 1968], No.8941/69. Heading G3P. A valve comprising a hollow body 12 and an axially shiftable element 14, is characterized by a pair of vortex fluid amplifiers 24, 32, means 40, 42 for supplying fluid to the amplifiers at predetermined relative pressures providing equal and opposite axial forces on the ends 22 of the element so that this latter is maintained in a first position and at a predetermined different relative pressure the element 14 is moved to a second position, and means for equalizing the forces on the ends 22 in the second position. A supply of fluid 76 is fed to inlet parts 66, 68 and further to either of the outlet ports 72, 74 unless the spool 14 is in its central first position. The fluid also flows via gaps 89 to the vortex amplifier 24, 32 to pressurize the vortex chambers. Control pressures Pc 1 , Pc 2 are fed tangentially to the vortex amplifiers 24, 32 respectively. Any predetermined relative increase in one control pressure forces the spool 14 to move axially towards the other vortex chamber to a second position, thus opening one of the outlet passages 72, 74 to control the piston 82. A feedback system includes apertures 50, 60 of varying resistance to fluid-flow to an exhaust 90 so that the feedback pressures Pf 1 , Pf 2 can produce a response in the vortex amplifiers 24, 32 to equalize the axial forces in the second position of the spool 14.