IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0237039
(2002-09-09)
|
발명자
/ 주소 |
- Floh, Roberto
- Spindler, Richard
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
15 |
초록
▼
A check valve is placed in a conduit for pressurized fluids, and comprises a cylindrical external housing having inlet and outlet ends, a cylindrical internal spigot, and an elastomeric sleeve fitted over the spigot. It is sealed at the second end, and has a plurality of radially directed vent apert
A check valve is placed in a conduit for pressurized fluids, and comprises a cylindrical external housing having inlet and outlet ends, a cylindrical internal spigot, and an elastomeric sleeve fitted over the spigot. It is sealed at the second end, and has a plurality of radially directed vent apertures along its length. The elastomeric sleeve is securely fitted to the internal spigot, in the region of the first, inlet end. The elastomeric sleeve has an internal diameter and an elastic memory such that it fits and adheres snugly to the outer periphery of the spigot, and its elasticity is overcome at a positive gauge pressure of between 5 and 20 psi so that pressurized fluid will flow from the vent apertures. Backflow of fluid at substantially zero or negative gauge pressure is precluded.
대표청구항
▼
1. A check valve assembly for placement in a fluid conduit within which a pressurized fluid is periodically delivered from a pump to a receiving vessel, and wherein when pressurized fluid is not being delivered the gauge pressure across said check valve will reduce from a positive value to approxima
1. A check valve assembly for placement in a fluid conduit within which a pressurized fluid is periodically delivered from a pump to a receiving vessel, and wherein when pressurized fluid is not being delivered the gauge pressure across said check valve will reduce from a positive value to approximately zero or a negative value; said check valve assembly comprising:a cylindrical external housing having an inlet end and an outlet end; a cylindrical internal spigot; and an elastomeric sleeve fitted over said internal spigot; wherein said external housing is adapted to be fitted to a fluid conduit at said outlet end for delivery of a pressurized fluid therefrom to a receiving vessel; wherein said cylindrical internal spigot is sealed at a first, inlet end thereof to said external housing at said inlet end thereof, and is adapted to be fitted to a fluid conduit for delivery of pressurized fluid thereto from a pump; wherein said cylindrical internal spigot extends axially along the interior of said cylindrical external housing from said inlet end thereof towards said outlet end thereof; wherein said cylindrical internal spigot has a radially outwardly directed sloping shoulder formed at a second end thereof near said outlet end, of said external housing, wherein the slope of said shoulder is directed away from said second end towards said first end; wherein said cylindrical internal spigot is sealed at said second end, and has a plurality of radially directed vent apertures formed therein from the interior to the outer periphery thereof, and arranged partially along the length thereof; wherein said elastomeric sleeve is securely fitted to said internal spigot, in the region of said first, inlet end thereof, wherein said elastomeric sleeve has an internal diameter and an elastic memory such that it fits and adheres snugly to the outer periphery of said internal spigot at least in the region thereof where said radially directed vent apertures are located, and over said sloped shoulder; and wherein the elasticity of said elastomeric sleeve is such that it is overcome at a positive gauge pressure between the inlet and outlet ends of said external housing in the range of between 5 and 20 psi; whereby pressurized fluid will flow from said radially directed vent apertures past the periphery of said internal spigot and between the periphery and the internal surface of said elastomeric sleeve towards the outlet end of said external housing when the elasticity of said elastomeric sleeve is overcome, and backflow of fluid at substantially zero or negative gauge pressure between said inlet and outlet ends of said external housing is precluded due to the elastic memory of said elastomeric sleeve as it adheres to the outlet periphery of said internal spigot. 2. The check valve assembly of claim 1, wherein said cylindrical internal spigot has a radially outwardly directed annular ridge formed on the outer periphery thereof at a position near the first, inlet end thereof, and wherein said elastomeric sleeve is fitted over said annular ridge and against the outer periphery of said internal spigot.3. The check valve assembly of claim 1, wherein said elastomeric sleeve is securely fitted to said cylindrical internal spigot, in the region of said first, inlet end thereof by securing means chosen from the group consisting of O-rings, and gaskets.4. The check valve assembly of claim 1, wherein said pressurized fluid is a caustic or corrosive liquid, an acid, or a gas.5. The check valve assembly of claim 1, wherein the material of said cylindrical external housing is chosen from the group consisting of plastics, brass, stainless steel, steel, copper, aluminum, and combinations thereof.6. The check valve of claim 1, wherein the material of said cylindrical internal spigot is chosen from the group consisting of plastics, brass, stainless steel, steel, copper, aluminum, and combinations thereof.7. The check valve assembly of claim 1, wherein the material of said elastomeric sleeve is chosen from the group consisting of C-FLEX?, Buna-N, VITON™, EPDM, silicone, nylon, rubber, flexible PVC, and combinations thereof.8. The check valve assembly of claim 1, wherein said cylindrical external housing is threaded internally at the outlet end thereof for fitment to a fluid conduit leading towards a receiving vessel for said pressurized fluid.9. The check valve assembly of claim 1, wherein said cylindrical internal spigot is threaded internally at the inlet end thereof for fitment to a fluid conduit leading from a pump for said pressurized fluid.10. The check valve assembly of claim 1, wherein said internal spigot extends along the interior length of said external housing for a length in the range of 60% to 90% thereof.11. The check valve assembly of claim 1, wherein the diameter of said annular ridge plus twice the thickness of the material of said elastomeric sleeve is substantially equal to the interior diameter of said cylindrical outer housing.12. The check valve assembly of claim 1, wherein the angle of the slope of said sloping shoulder with respect to the longitudinal axis of said check valve assembly is in the range of from 30° to 60°.13. The check valve assembly of claim 1, wherein the region of said internal spigot where said radially directed vent apertures are located is from 30% to 60% of the length of said internal spigot.
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