NON-WATER HAMMERING CHECK VALVE DEVICE

Title:

NON-WATER HAMMERING CHECK VALVE DEVICE

Document Type and Number:

WIPO Patent Application WO/1996/018054

Kind Code:

A1

Abstract:

The invention provides a reasonable, non-water hammering check valve device which radically dissolves a technical problem unsolved in conventional, non-water hammering check valves, is simple and precise in construction to provide less valve resistance loss at a predetermined maximum flow-rate, and in which, when input to a pump is cut off, a valve disc can readily respond to rapid status changes in flow to be free of delay in valve closing movement, and when flow in a flow passage in a direction of discharge loses inertia to stop, the valve disc substantially comes into contact with the valve seat and gently contacts with the valve seat at that time to prevent water hammering and impulsive sounds. In the check valve device, the single-lobe valve disc and the valve seat are constructed so as to easily follow up movements of passing fluid, the valve disc is connected to a braking device through a linear movement transmitting mechanism, and the braking device and the movement transmitting mechanism are constructed to entirely eliminate influences such as braking and friction on actuating portions and sealing portions which cause deceleration of valve closing movement during a period from the valve closing starting by the valve disc to immediately before valve seating, whereby gentle braking is limitedly effected in a short period from immediately before valve seating to the valve seating to prevent water hammering and impulsive noise at the time of valve seating. Further, timing of valve seating can be adjusted by means of a braking start position adjusting portion, a bypass adjusting valve of the braking device, adjustment of biasing forces of a valve closing biasing member and the like.

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Inventors:

YOKOTA HIROSHI (JP)
YOKOTA SHINGO (JP)

Application Number:

PCT/JP1995/002463

Publication Date:

June 13, 1996

Filing Date:

December 01, 1995

Export Citation:

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Assignee:

YOKOTA MFG (JP)
YOKOTA HIROSHI (JP)
YOKOTA SHINGO (JP)

International Classes:

F16K15/03; F16K47/02; (IPC1-7): F16K15/03

Foreign References:

JPH0324377A	1991-02-01
JPS30176Y1	1955-01-11
JPS271263Y1	1952-02-14

Other References: