COMPOUND ACTION TYPE NON-WATER HAMMERING CHECK VALVE DEVICE

Title:

COMPOUND ACTION TYPE NON-WATER HAMMERING CHECK VALVE DEVICE

Document Type and Number:

WIPO Patent Application WO/1995/020735

Kind Code:

A1

Abstract:

The invention has its object to radically resolve an untapped technical issue in a non-water hammering check valve device, in which a valve disc, a valve seat and a surrounding flow passage are configured such that the valve disc is substantially seated on the valve seat at the time when input to a pump is shut off and a discharge flow in the flow passage loses inertia to stop, and to provide a reasonable non-water hammering check valve device of a simple and clear construction which suffers a small resistance loss of a valve at the time of a predetermined maximum flow rate, can readily accommodate an abrupt change in a flow state without delay in valve closing operation and provides a uniform and close seating on the valve seat at the time of valve seating to prevent water hammering. In the non-water hammering check valve device, a valve disc (4) is connected to an arm portion (5) through a valve disc support shaft (6) with a required freedom of swinging, and the arm portion (5) is connected to a valve body (1) through an arm support shaft (7). At the time of valve opening, the valve disc (4) is caused by an additional acting force, which turns the valve disc (4) about the valve disc support shaft (6), to be floatingly supported in the flow passage while an upstream end (4a) of the valve disc and an upstream end (5a) of the arm portion preferentially abut against each other all the time. At the time of valve closing, a downstream end (4b) of the valve disc preferentially abuts against a valve seat (3), and in a subsequent valve seating stroke, the entire surface of the valve disc (4) comes into uniform and close contact with the valve seat (3) to prevent water hammering caused by counterflow.

Inventors:

YOKOTA HIROSHI (JP)
YOKOTA SHINGO (JP)

Application Number:

PCT/JP1995/000097

Publication Date:

August 03, 1995

Filing Date:

January 27, 1995

Export Citation:

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Assignee:

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

International Classes:

E03C1/10; F16K1/20; F16K15/03; F16K15/18; F16K47/00; F16K47/02; F16L55/055; (IPC1-7): F16K15/03; F16K1/20

Foreign References:

JPS6360274B2	1988-11-24
JPH05507999A	1993-11-11

Other References: