VALVE

摘要

A valve includes a housing having a fluid inlet and a fluid outlet and defining a fluid flow path between the fluid inlet and the fluid outlet. A device is included for restricting the flow between the inlet and the outlet has includes comprise fixed flow restriction device for applying a pre-determined counter-flow pressure and a device for applying an additional counter-flow pressure according to the pressure in an environment external to the valve.

主权项

1. A valve comprising a housing having a fluid inlet and a fluid outlet, the housing defining a fluid flow path between said fluid inlet and said fluid outlet, the valve further comprising means for restricting the flow between said fluid inlet and said fluid outlet, said means comprising fixed flow restriction means for applying a predetermined counter-flow pressure and means for applying an additional counter-flow pressure according to the pressure in an environment external to said valve.