A relief valve assembly is disclosed to include a casing, an one-way valve mounted in the fluid input end of the casing for guiding in a fluid, and a relief control valve installed in the casing between the fluid input end and fluid output end and controllable to reduce the inside pressure of the ca
A relief valve assembly is disclosed to include a casing, an one-way valve mounted in the fluid input end of the casing for guiding in a fluid, and a relief control valve installed in the casing between the fluid input end and fluid output end and controllable to reduce the inside pressure of the casing, the relief control valve including a guide tube fastened to the casing in fluid communication between the fluid input end and fluid output end of the casing, a valve stem axially movably inserted through the guide tube, an O-ring in a groove around the valve stem between the head of the valve stem and a flange at one end of the stem body of the valve stem, and a spring member connected between the guide tube and one end of the valve stem to hold the valve stem in the close position to close the passage of the guide tube, and a control member fastened to one end of the valve stem outside the guide tube for pressing by hand to move the valve stem to the open position to open the passage of the guide tube.
대표청구항▼
What is claimed is: 1. A relief valve assembly comprising: a casing, said casing having a fist end, and a second end; an one-way valve mounted in the first end of said casing for allowing a fluid to pass through the first end of said casing toward the second end of casing and prohibiting reverse f
What is claimed is: 1. A relief valve assembly comprising: a casing, said casing having a fist end, and a second end; an one-way valve mounted in the first end of said casing for allowing a fluid to pass through the first end of said casing toward the second end of casing and prohibiting reverse flow of said fluid out of said casing through the first end of said casing; and a relief control valve installed in said casing between the first end and second end of said casing and controllable to discharge said fluid out of said casing through said relief control valve; wherein: said relief control valve comprises: a guide tube fastened to said casing, said guide tube comprising a passage extending through two distal ends thereof in fluid communication between the first end and second end of said casing, said guide tube having a stop flange at one end of the passage of said guide tube; a valve stem axially movable inserted through said guide tube, said valve stem comprising a head for stopping against said stop flange of said guide tube to seal the passage of said guide tube, a stem body extending from said head, a flange extending around the periphery of one end of said stem body, and a groove extending around the periphery between said head and the flange of said stem body; an O-ring mounted in said groove of said valve stem and stopped between said head and the flange of said stem body; and a spring member sleeved onto said stem body and stopped between a part inside said guide tube and one end of said stem body of said valve stem remote from said head of said valve stem to support said valve stem in a close position where said head of said valve stem is stopped against said stop flange of said guide tube and said O-ring is stopped at one end of the passage of said guide tube to block the passage of said guide tube and for enabling said valve stem to be moved axially relative to said guide tube from said close position to an open position to move said head and said O-ring away from said guide tube and to open the passage of said guide tube. 2. The relief valve assembly as claimed in claim 1, wherein said guide tube has a chamfered edge at one end of the passage thereof for stopping against said O-ring. 3. The relief valve assembly as claimed in claim 1, wherein the first end of said casing is a fluid input end connectable to a fluid supply device; the second end of said casing is mounted with a pressure gage that measures and indicates the inside pressure of said casing. 4. The relief valve assembly as claimed in claim 1, wherein said casing further comprises a radial through hole formed in the periphery thereof in fluid communication between the first end and second end of said casing for holding said relief control valve. 5. The relief valve assembly as claimed in claim 1, wherein said guide tube has a first end and a second end, the second end of said guide tube being fastened to said casing in fluid communication between the first end and second end of said casing; said stem body of said valve stem extends through the first end of said guide tube and fastened with a control member outside said guide tube for pressing by the user to move said valve stem axially relative to said guide tube to open the passage of said guide tube. 6. The relief valve assembly as claimed in claim 1, further comprising a chuck provided at the first end of said casing for connecting said casing to an external device. 7. The relief valve assembly as claimed in claim 6, wherein said chuck comprises a mounting tube fastened to the first end of said casing, a shell axially slidably sleeved onto said mounting tube, and a movable member mounted axially movably mounted inside said mounting tube. 8. A relief valve assembly comprising: a casing, said casing having a fist end, and a second end; an one-way valve mounted in the first end of said casing for allowing a fluid to pass through the first end of said casing toward the second end of casing and prohibiting reverse flow of said fluid out of said casing through the first end of said casing; and a relief control valve installed in said casing between the first end and second end of said casing and controllable to discharge said fluid out of said casing through said relief control valve; wherein: said one-way valve comprises: a guide tube fastened to the first end of said casing, said guide tube comprising a passage extending through two distal ends thereof in fluid communication with the first end of said casing, said guide tube having a stop flange at one end of the passage of said guide tube; a valve stem axially movable inserted through said guide tube, said valve stem comprising a head for stopping against said stop flange of said guide tube to seal the passage of said guide tube, a stem body extending from said head, a flange extending around the periphery of one end of said stem body, and a groove extending around the periphery between said head and the flange of said stem body; an O-ring mounted in said groove of said valve stem and stopped between said head and the flange of said stem body; and a spring member sleeved onto said stem body and stopped between a part inside said guide tube and said one end of said stem body of said valve stem remote from said head of said valve stem to support said valve stem in a close position where said head of said valve stem is stopped against said stop flange of said guide tube and said O-ring is stopped at one end of the passage of said guide tube to block the passage of said guide tube and for enabling said valve stem to be moved axially relative to said guide tube from said close position to an open position by an external pressure to disengage said head and said O-ring from said guide tube and to open the passage of said guide tube. 9. The relief valve assembly as claimed in claim 8, wherein said guide tube has a chamfered edge at one end of the passage thereof for stopping against said O-ring. 10. The relief valve assembly as claimed in claim 8, wherein the first end of said casing is a fluid input end connectable to a fluid supply device; the second end of said casing is mounted with a pressure gage that measures and indicates the inside pressure of said casing. 11. The relief valve assembly as claimed in claim 8, wherein said casing further comprises a radial through hole formed in the periphery thereof in fluid communication between the first end and second end of said casing for holding said relief control valve. 12. The relief valve assembly as claimed in claim 8, wherein said guide tube has a first end and a second end, the second end of said guide tube being fastened to said casing in fluid communication between the first end and second end of said casing; said stem body of said valve stem extends through the first end of said guide tube and mounted with a stopper outside said guide tube, said stopper being adapted to receive an external pressure to move said valve stem to said open position. 13. The relief valve assembly as claimed in claim 8, further comprising a chuck provided at the first end of said casing for connecting said casing to an external device. 14. The relief valve assembly as claimed in claim 13, wherein said chuck comprises a mounting tube fastened to the first end of said casing, a shell axially slidably sleeved onto said mounting tube, and a movable member mounted axially movably mounted inside said mounting tube.
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