A non-return valve mechanism comprises a tubular member (1) having a substantially constant external diameter whereby the tubular member can be inserted into a pipe (5) from an open end thereof. A pivotable closure member (9) is provided at one end of the tubular member for closing the end of the tu
A non-return valve mechanism comprises a tubular member (1) having a substantially constant external diameter whereby the tubular member can be inserted into a pipe (5) from an open end thereof. A pivotable closure member (9) is provided at one end of the tubular member for closing the end of the tubular member, the closure member being adapted to be positioned externally of the pipe. At least one seal (3) extends around the external periphery of the tubular member for sealing with an internal surface of the pipe into which the tubular member is inserted.
대표청구항▼
1. A non-return valve mechanism comprising a tubular member (1) having an external periphery with a substantially constant external diameter whereby the tubular member can be inserted into a pipe (5) from an open end thereof, a pivotable closure member (9) provided at one end of the tubular member f
1. A non-return valve mechanism comprising a tubular member (1) having an external periphery with a substantially constant external diameter whereby the tubular member can be inserted into a pipe (5) from an open end thereof, a pivotable closure member (9) provided at one end of the tubular member for closing the one end of the tubular member the closure member being adapted to be positioned externally of the pipe, at least one first seal (3) extending around the external periphery of the tubular member for sealing with an internal surface of the pipe into which the tubular member is inserted, and an annular second seal (11) mounted on the closure member (9) such that the closure member (9) bears against an end of the tubular member (1) by way of the annular second seal (11), the annular second seal (11) being substantially S-shaped in cross-section whereby the second seal envelopes a peripheral region of the closure member (9) and includes a radially outwardly extending flange portion for sealing against the end of the tubular member (1). 2. A valve as claimed in claim 1, wherein two axially spaced first seals (3) are provided. 3. A valve as claimed in claim 1, wherein the at least one first seal (3) comprises an O-ring seal mounted in a circumferential groove (39, 41) formed in the external surface of the tubular member (1). 4. A valve as claimed in claim 3, wherein the diameter of the circumferential groove (39, 41) is tapered in an axial direction of the tubular member (1), the diameter of the groove decreasing with increasing distance from the closure member (9). 5. A valve as claimed in claim 1, wherein the tubular member (1) is formed with a circumferential shoulder (7) in a region adjacent to the closure member (9) for abutting against an end of a pipe (5) into which the valve mechanism is inserted. 6. A valve as claimed in claim 1, wherein the inner surface of the tubular member (1) is tapered at an end (2) thereof remote from the closure member (9) to facilitate fluid flow through the tubular member. 7. A valve as claimed in claim 1, wherein the closure member (9) incorporates a component (45) of relatively higher specific gravity than the remainder of the closure member so as to act as a counterweight and thereby urge the closure member into sealing contact with the end of the tubular member (1). 8. A non-return valve mechanism comprising a tubular member (1) having an external periphery with a substantially constant external diameter whereby the tubular member can be inserted into a pipe (5) from an open end thereof, a pivotable closure member (9) provided at one end of the tubular member for closing the one end of the tubular member, the closure member being adapted to be positioned externally of the pipe, at least one first seal (3) extending around the external periphery of the tubular member for sealing with an internal surface of the pipe into which the tubular member is inserted, and a locking member (23) adapted to releasably lock the closure member (9) in sealing contact with the one end of the tubular member (1), the locking member (23) engaging with a recess (43) formed in an operating arm (13) for the closure member (9) so as to lock the closure member. 9. A valve as claimed in claim 8 wherein the locking member (23) bears against an operating arm (13) for operating the closure member (9) so as to lock the closure member. 10. A valve as claimed in claim 8, wherein two axially spaced first seals (3) are provided. 11. A valve as claimed in claim 8, wherein the closure member (9) incorporates a component (45) of relatively higher specific gravity than the remainder of the closure member so as to act as a counterweight and thereby urge the closure member into sealing contact with the end of the tubular member (1). 12. A non-return valve mechanism comprising a tubular member (1) having an external periphery with a substantially constant external diameter whereby the tubular member can be inserted into a pipe (5) from an open end thereof, a pivotable closure member (9) provided at one end of the tubular member for closing the one end of the tubular member the closure member being adapted to be positioned externally of the pipe, and at least one first seal (3) extending around the external periphery of the tubular member for sealing with an internal surface of the pipe into which the tubular member is inserted, wherein the tubular member (1) is provided with an extension tube (27) releasably mounted on an end of the tubular member remote from the closure member and secured to the tubular member (1) by way of one or more catches formed on one of the extension tube and the tubular member and engaging in corresponding apertures formed in the other of the extension tube and the tubular member. 13. A valve as claimed in claim 12, wherein the extension tube (27) is provided with one or more first seals (3) extending around the external periphery thereof. 14. A valve as claimed in claim 13, wherein two axially spaced first seals (3) are provided. 15. A valve as claimed in claim 13, wherein the one or more first seals (3) comprises an O-ring seal mounted in a circumferential groove (47, 49) formed in the external surface of the extension tube (27). 16. A valve as claimed in claim 15, wherein the diameter of the circumferential groove (47, 49) is tapered in an axial direction of the tubular member (1), the diameter of the groove decreasing with increasing distance from the closure member (9). 17. A valve as claimed in claim 12, wherein the inner surface of the extension tube (27) is tapered at that end thereof remote from the tubular member (1) to facilitate fluid flow through the extension tube. 18. A valve as claimed in claim 12, wherein the inner surface of the tubular member (1) is tapered at that end (2) thereof remote from the closure member (9) to facilitate fluid flow through the tubular member, and wherein the outer surface of the extension tube (27) is formed with a complementary taper such that the portion of the extension tube having the complementary external taper lies adjacent to the internal tapered region (2) of the tubular member (1). 19. A valve as claimed in claim 12, wherein two axially spaced first seals (3) are provided. 20. A valve as claimed in claim 12, wherein the closure member (9) incorporates a component (45) of relatively higher specific gravity than the remainder of the closure member so as to act as a counterweight and thereby urge the closure member into sealing contact with the end of the tubular member (1).
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이 특허에 인용된 특허 (2)
Luthy Ronald K. (Garden Grove CA), Backflow valve mounting and sealing device.
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