Water-hammer preventing unit for check valve

Details Water-hammer preventing unit for check valve Water-hammer preventing unit for check valve

2006-10-31

2006-10-31

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S527000, C138S030000

Reexamination Certificate

active

07128090

ABSTRACT:
In a water-hammer preventing unit for a check valve according to the present invention, a retainer pipe having openings at two edges thereof is provided inside a short pipe to form a circular space with the short pipe, and openings are formed on this retainer pipe. Further an elastic tube is provided on an external peripheral surface of the retainer pipe and covers the openings, and a communication path is formed between the short pipe and the valve body holder, and the communication path communicates the circular space to the flow path in the upstream side of the valve body and, when a fluid flows in the reverse direction, a portion of the fluid is accommodated from the opening into the circular space by expanding the elastic tube toward the circular space, and also flows a portion of the fluid in the said circular space to the flow path in the upstream side from the valve body.

REFERENCES:
patent: 4186775 (1980-02-01), Muroi
patent: 54020274 (1979-02-01), None
patent: 07-145870 (1995-06-01), None
patent: 07293721 (1995-11-01), None

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