Flow control valve

摘要

In one embodiment, a constant-flow valve assembly is provided that comprises a first fluid passageway carrying fluid at a first fluid pressure, a piston chamber, and a second fluid passageway connected to the chamber and carrying fluid at a second fluid pressure. A third fluid passageway is configured to carry fluid at a third fluid pressure. An adjustable valve member is provided between the chamber and the third passageway to provide constant fluid flow to the third passageway. An adjustable restrictor assembly is positioned between the first and second fluid passageways. An inlet portion of the restrictor assembly receives fluid at the first fluid pressure and directs the fluid to a restrictor. An outlet portion receives fluid from the restrictor and directs the fluid to the second fluid passageway at the second fluid pressure. The restrictor is movable to adjust the position of entry and exit portions relative to the inlet and outlet portions to adjust a fluid flow rate through fluid pathway to the second fluid passageway, thereby adjusting the flow rate through the valve assembly.

主权项

1. A flow valve assembly, comprising:
a fluid inlet portion with a fluid inlet; a fluid outlet portion with a fluid outlet; a fluid passageway between the fluid inlet and fluid outlet; and an adjustable restrictor having the fluid passageway extending therethrough, the restrictor having an entry portion defining a portion of the fluid passageway that receives fluid from the fluid inlet portion, the restrictor having an exit portion that directs fluid along the fluid passageway toward the fluid outlet portion, the restrictor being movable to adjust the position of the entry and exit portions relative to the fluid inlet and fluid outlet, the fluid passageway includes the entry portion defined by a plurality of blind notches interconnected by at least one blind channel and in fluid communication with a through passage between the entry and exit portions, the restrictor being movable to allow the fluid inlet portion to interfere with at least a portion of the entry portion to adjustably restrict the fluid flow into the blind notches, blind channel, or through hole and to control the fluid flow rate through the adjustable restrictor.