Control element and check valve assembly

摘要

An arrangement includes a housing defining a first and second ports. A first passageway provides communication between the ports; a second passageway provides communication with the first port. An element is disposed in the housing and positioned by a balance of forces, the element is positionable to throttled positions for controlling flow through the first passageway in a first direction and to an open position to permit unrestricted flow in a second direction. A check valve is disposed in the second passageway for preventing flow therein from the first port when pressure in the first port is greater than pressure in the second port, and permitting flow through the second passageway to the first port when pressure in the first port is less than the pressure in the second port thereby affecting the balance of forces acting on the element so the element is urged toward the fully open position.

主权项

1. A valve arrangement, comprising:
a housing defining
a first port for connection to an external fluid circuit;a second port for connection to the external fluid circuit; anda first fluid passageway providing fluid communication between the first port and the second port; a second fluid passageway providing fluid communication with the first port; a control element disposed in the housing and positioned by a balance of forces acting thereon, the control element being positionable to one or more throttled positions for controlling fluid flow through the first fluid passageway from the first port to the second port, the control element being positionable to a fully open position to permit relatively unrestricted fluid flow through the first fluid passageway from the second port to the first port; and a check valve disposed in the second fluid passageway for preventing fluid flow through the second fluid passageway from the first port when fluid pressure in the first port is greater than fluid pressure in the second port, and permitting fluid flow through the second fluid passageway to the first port when fluid pressure in the first port is less than the fluid pressure in the second port thereby affecting the balance of forces acting on the control element such that the control element is urged toward the fully open position.