초록 ▼

A fluid control device for hydraulic systems is provided having closure means movably positioned within a valve housing and adapted to selectively close a fluid passageway in response to a predetermined pressure level. The closure means includes a piston body slidably located in the valve housing fo

A fluid control device for hydraulic systems is provided having closure means movably positioned within a valve housing and adapted to selectively close a fluid passageway in response to a predetermined pressure level. The closure means includes a piston body slidably located in the valve housing for reciprocating movement therein and a spring adapted to bias the piston body away from a shoulder to maintain the fluid passageway open during normal operation. The piston body includes a conical nose and a plurality of flow channels (or apertures) which allow fluid to pass through the piston body during normal flow. When the fluid pressure is large, indicating a downstream break or leak in the flow line, the fluid pressure will overcome the force exerted by the spring and force the piston body against the shoulder, thereby blocking the flow pathway and stopping flow through the device.

대표청구항 ▼

A flow control device for stopping the flow of fluid therethrough when there is a break or leak in the flow path downstream of said device, comprising: a housing having a first end and a second end; an inlet port located in said first end of said housing for admitting fluid to said housing, said inl

A flow control device for stopping the flow of fluid therethrough when there is a break or leak in the flow path downstream of said device, comprising: a housing having a first end and a second end; an inlet port located in said first end of said housing for admitting fluid to said housing, said inlet port having a cross-sectional area; an outlet port located in said second end of said housing for discharging fluid from said housing, said outlet port having a cross-sectional area; a cylindrical valve chamber located in said housing, wherein said cylindrical valve chamber comprises an aperture provided in said housing such that said aperture extends from said first end of said housing toward said second end of said housing, said cylindrical valve chamber having a first end and a second end, said first end of said cylindrical valve chamber being in fluid communication with said fluid inlet port and said second end of said cylindrical valve chamber being in fluid communication with said outlet port; a washer-shaped sealing shoulder located at said second end of said cylindrical valve chamber; a piston valve body located for reciprocating movement in said cylindrical valve chamber, said piston valve body having a plurality of longitudinally extending flow channels therethrough, said flow channels being oriented substantially parallel to the direction of said flow path, each of said flow channels having an inlet with a cross-section and an outlet with a cross-section, a sum taken of said inlet cross-sections being greater than said cross-section of said inlet port, a sum taken of said outlet cross-sections being greater than said cross-section of said outlet port, said second end of said cylindrical valve chamber being blocked by said piston valve body when said body abuts said washer-shaped shoulder; and means for biasing said piston valve body away from said washer-shaped shoulder, said biasing means thereby allowing fluid entering said first end of said cylindrical valve chamber to flow through said flow channels in said piston valve body and out said second end of said cylindrical valve chamber, said piston body overcoming the biasing of said biasing means to move gradually into contact with said washer-shaped shoulder thereby sealing said cylindrical valve chamber from being in fluid communication with said outlet port with a minimum of shock, when a break or leak in the flow path occurs downstream of said device; wherein said piston valve body comprises a cylindrical element having a conical nose portion extending from a first end thereof, said conical nose portion providing a seating area that blocks said second end of said cylindrical valve chamber when said piston valve body abuts said washer-shaped shoulder, and wherein said seating area comprises a continuous tapered surface that is devoid of flow channels.