초록 ▼

There is disclosed a family of check and/or pressure relief fluid valves utilizing a spring biased annular diaphragm element for valving. In a single-function form there is disclosed a simple check valve. In a dual-function form there is disclosed a check valve also having a pressure relief function

There is disclosed a family of check and/or pressure relief fluid valves utilizing a spring biased annular diaphragm element for valving. In a single-function form there is disclosed a simple check valve. In a dual-function form there is disclosed a check valve also having a pressure relief function permitting reverse flow above a predetermined pressure differential, this form being disclosed in an automotive fuel tank filler tube cap (i.e. a “gas cap”). There is also disclosed an improved filler tube cap construction and seal therefor. In a multifunction form there is disclosed a fluid valve capable of relieving a source of fluid under pressure to a primary outlet at a first very low pressure and additionally to a secondary outlet at a higher pressure. This valve also acts as a check valve by preventing the pressure of the fluid source from dropping below that at the secondary outlet. There is also disclosed an arrangement for using this multifunction valve in an evaporative emission control system for a motor vehicle having an internal combustion engine. All of the valves disclosed are particularly suited for gaseous fluids.

대표청구항 ▼

A valve comprising: housing means having an inlet, a first outlet, a second outlet and a hollow interior cavity: resilient diaphragm means extending across said cavity; means placing said inlet in fluid communication with one side of said diaphragm means; means defining a central passageway through

A valve comprising: housing means having an inlet, a first outlet, a second outlet and a hollow interior cavity: resilient diaphragm means extending across said cavity; means placing said inlet in fluid communication with one side of said diaphragm means; means defining a central passageway through said diaphragm; means defining a first circular valve surface on the other side of said diaphragm means generally concentric with said passageway therethrough; a movable valve element having a second circular valve surface adapted to sealingly engage said first valve surface; a third circular valve surface disposed on said valve element within said second valve surface and facing said other side of said diaphragm means; means defining a passageway from said firsit outlet through said valve element, said third valve surface surrounding said last-named passageway; a fixed valve member disposed between said diaphragm means and said valve element and having a fourth circular valve surface adapted to sealingly engage said third valve surface; means placing said second outlet in fluid communication with said first and second valve surfaces; and spring means biasing said valve element towards said diaphragm means and said valve member whereby said first valve surface normally engages said second valve surface and said third valve surface normally engages said fourth valve surface; and stop means for limiting movement of said diaphragm means in a direction towards said valve element.