The invention relates to check valves and more particularly to a check valve having improved characteristics.
A conventional check valve is shown in
The torsion spring C expands to push the closing member D and urge the O-ring E against a seat (not numbered) on an inner surface of the body A, thereby blocking fluid flow in a closed position (see
In response to forward flow W and pressure of the flow W is greater than force exerted on the closing member D by the spring C, the closing member D disengages from the seat. As a result, the flow W passes through an annular gap between the closing member D and the seat and the channels B2 to an outlet (see
However, a small volume of the flow W may leak by passing through a gap between the stem D1 and the sleeve B1.
Thus, the need for improvement still exists.
It is therefore one object of the invention to provide a check valve comprising a cylindrical body being hollow and including a plurality of inlets through a bottom, a receptacle on a center of the bottom with the inlets therearound, an O-ring mounted on an outer surface of the body, and a seat on a joining portion of the bottom of the cylindrical body and an inner surface of the cylindrical body; a flexible disc including a flat on one surface and a peg extending from a center of the other surface, the peg being disposed in the receptacle to secure the disc to the cylindrical body wherein an edge of the other surface of the flexible disc is rested upon the seat; and a cylindrical guide being hollow and secured to the cylindrical body, the cylindrical guide including a stem urging against a center of the flat, and a plurality of outlets through an end to communicate with inside of the cylindrical body; wherein the inlets are blocked by the flexible disc in a closed position.
The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings.
Referring to
A hollow, cylindrical body 1 includes an internal space 11, four inlets 12 through a bottom, a receptacle 13 on a center of the bottom with the inlets 12 therearound, an annular groove 14 formed on an outer surface of the body 1 adjacent to the inlets 12 with an O-ring 1A disposed therein, and a seat 15 on a joining portion of the bottom of the body 1 and an inner surface of the body adjacent to the inlets 12.
A flexible disc 2 includes a flat 21 on one surface and a peg 22 extending from a center of the other opposite surface and completely disposed in the receptacle 13 to secure the disc 2 and the body 1 together. Further, the edge of the other surface of the disc 2 is rested upon the seat 15.
A hollow, cylindrical guide 4 is secured to the body 1 and includes a stem 41 extending from a center to urge against a center of the flat 21, a plurality of outlets 42 spaced around an edge of one end surface and through one end surface to communicate with the space 11, and an annular, grooved member 43 spaced around the stem 41 with an O-ring 4A disposed therein.
The inlets 12 are blocked by the disc 2 in a closed position (see
It is envisaged by the invention that the disc 2 may return to its normal closed position if the flow W is sufficiently slow or stops, thereby blocking the reverse flow.
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While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the spirit and scope of the appended claims.