Pilot control valve utilizing multiple offset slide valves

Details Pilot control valve utilizing multiple offset slide valves Pilot control valve utilizing multiple offset slide valves

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 53/10 (2006.01) F01L 25/06 (2006.01) F04B 9/125 (2006.01) F04B 39/00 (2006.01)

Patent

CA 2437849

A pilot control valve for controlling a reciprocating pump having a valve member shiftable within a valve body between a first or "downstroke" position and a second or "upstroke" position. When the valve member is in its first position, the valve member positions a pair of slide valves to allow communication of control fluid to the lower surface of a piston to move the piston from a first position to a second position. As the piston reaches its second position, a poppet disposed in a rod attached to the piston allows control fluid acting on the valve member to depressurize. As such control fluid is depressurized, pressurized control fluid acts on the valve member to move the valve member from its first position to its second position, In its second position, the valve member positions the pair of slide valves to block communication of the control fluid to the lower surface of the piston and to allow communication of the control fluid to the upper surface of the piston causing the piston to return to its first position. As the piston returns to its first position, the poppet disposed in the piston rod allows the pressurized control fluid acting on the upper surface of the piston to act on the valve member to move the valve member back to its first position. In its first position, the valve member repositions the pair of slide valves to block communication of the control fluid to the upper surface of the piston and allows communication of the control fluid to the lower surface of the piston and the process is repeated.

Un robinet pilote pour commander une pompe alternative avec clapet réglable sur deux positions dans un robinet à membrane : « course descendante » et « course ascendante ». Quand le clapet est à la première position, il place une paire de robinets à tiroir de manière à permettre au fluide d'atteindre la surface inférieure d'un piston afin de le faire passer de la première à la deuxième. Quand le piston atteint la deuxième position, une soupape champignon placée dans une tige qui est rattachée au piston permet au fluide agissant sur le piston de se dépressuriser. Quand ce fluide est dépressurisé, le fluide sous pression agit sur le clapet de façon à le faire passer de la première à la deuxième position. Quand il est à la deuxième position, le clapet place une paire de robinets à tiroir de manière à empêcher le fluide d'atteindre la surface inférieure du piston; il est plutôt acheminé à la surface supérieure du piston, ce qui le force à revenir à la première position. Quand le piston atteint la première position, la soupape champignon placée dans la tige du piston permet au fluide sous pression agissant sur la surface supérieure du piston de déplacer à nouveau le clapet à sa première position. Quand il est à la première position, le clapet place la paire de robinets à tiroir de manière à empêcher le fluide d'atteindre la surface supérieure du piston; il est plutôt acheminé à la surface inférieure du piston et le processus recommence.

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