초록 ▼

This invention relates to a flow check prevention mechanism especially useful in a female coupler for preventing closure of a male coupler coupled thereto should a vacuum occur in the female coupler when fluid flow out of the female coupler is momentarily blocked. The female coupler includes a housi

This invention relates to a flow check prevention mechanism especially useful in a female coupler for preventing closure of a male coupler coupled thereto should a vacuum occur in the female coupler when fluid flow out of the female coupler is momentarily blocked. The female coupler includes a housing having a bore formed therein with a receptacle movably positioned within the bore. The receptacle contains a main cavity which is connected by a passageway to an engagement bore. The engagement bore receives the male coupler. Located within the receptacle is a main poppet valve which controls the fluid flow through the passageway and a secondary poppet valve which relieves fluid pressure from the main cavity through an outlet port. The female coupler also includes a movable piston which assists in moving the main valve against excessive pressure which may be contained within the male coupler and a collar member which limits the travel of the main valve. The female coupler further includes a flow check prevention valve positioned within the main cavity which assures that the pressure impinging on the piston will be equal to or greater than the pressure present in the remainder of the main cavity. The flow check prevention valve functions to insure that the passageway between the male and female couplers remain open when fluid flow out of the female coupler is blocked by a directional control valve and when a vacuum occurs within the main cavity due to displacement of fluid within the hydraulic function. The female coupler also includes a lever mechanism to assist in the coupling and uncoupling process.

대표청구항 ▼

A female coupler with a flow check prevention mechanism for preventing closure of a male coupler coupled thereto should a vacuum occur in said female coupler when fluid flow out of said female coupler is momentarily blocked, said female coupler comprising: (a) a housing; (b) a receptacle movably pos

A female coupler with a flow check prevention mechanism for preventing closure of a male coupler coupled thereto should a vacuum occur in said female coupler when fluid flow out of said female coupler is momentarily blocked, said female coupler comprising: (a) a housing; (b) a receptacle movably positioned within said housing, said receptacle having a main cavity formed therein which is joined by a passageway to an engagement bore located at one end of said receptacle and into which said male coupler is engageable, a valve seat formed about the periphery of one end of said passageway, and first and second ports which communicate with said main cavity; (c) main valve means for controlling fluid flow through said passageway, said main valve means including a valve member having an internal passage formed therein which provides fluid communication between said first and second ports and a valve stem extending outward from said valve member which projects through said passageway and into said engagement bore when said main valve means is in a closed position; (d) secondary valve means for controlling fluid flow through said second port, said secondary valve means being movable between an open and a closed position; (e) lever-actuatable cam means for linearly moving said receptacle within said housing and for moving said secondary valve means from said closed to said open position; (f) piston means for assisting in moving said main valve means against excessive pressure contained in said male coupler, said piston means being positioned within said main cavity between said first and second ports and having a first surface against which fluid can impinge and a second surface which contacts a portion of said main valve means; (g) flow check prevention means for regulating fluid flow between said first port and an area adjacent to said first surface of said piston means by permitting fluid flow from the first port to said area at a lower pressure than it permits flow from said area to said first port, said flow check prevention means preventing closure of an opening between said female coupler and said male coupler when a vacuum is present in said main cavity.