US 9,541,209 B2Granted

Structure of check valve

AssigneeSankei Giken Co., Ltd.

InventorsKaneyoshi Hayashi, Shigeyoshi Hayashi

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Abstract

Provided is an attachment structure of a check valve that is easily attached to piping, and does not need time and effort of manufacturing. A valve casing having a collar part is attached so as to be sandwiched between a pair of flanges joined to each other through an annular seal body in an upstream side in a fluid flow direction. In this valve casing, a valve is biased in a seating direction to a valve seat through a shaft and a biasing means.

Drawings

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Drawings

Claims8

Dependent claims

A check valve comprising:

a valve casing that has a collar part at an outer periphery of one end of a cylindrical part, and has a valve seat at an other end opening of the cylindrical part;
a shaft support part that has an insertion part for a shaft at a center, and in which a coupling part is formed that extends outwardly in a radial direction from the insertion part, and in which an end of the coupling part is connected to an inner periphery of the valve casing;
the shaft whose one end is inserted and secured to the insertion part of the shaft support part, and whose other end is projected;
a valve in which the shaft is inserted in a center hole in a liquid-tight manner, and that is removably seated on the valve seat;
and
a biasing means that biases the valve in a seating direction, wherein
the valve of the check valve is arranged inside a flexible rubber pipe body having respective metal flanges at respective ends, and the collar part of the check valve is attached so as to be sandwiched between the flange and a flange of piping facing the flange through an annular seal body;
and the shaft remains in a fixed position when the valve is opened and closed;
and
wherein
an outer diameter of the cylindrical part of the valve casing is smaller than an inner diameter of an end of an insertion side of the flexible rubber pipe body,
and wherein
the collar part of the valve casing is arranged between the flanges and an annular passage is formed between the cylindrical part and the flexible rubber pipe body,
and wherein
the collar part is of sufficient thickness to accommodate a bypass path,
and wherein
a bypass path is formed in the collar part and openably communicates with an inlet/outlet port provided at an inner periphery of the cylindrical part at which the collar part is located with an inlet/outlet port provided at a flat surface of the collar part,
and wherein
the bypass path and the annular passage communicate with each other.

16 more elements

A check valve comprising:

a valve casing that has a collar part at an outer periphery of one end of a cylindrical part, and has a valve seat at another end opening of the cylindrical part;
a shaft support part that has an insertion part for a shaft at a center, and in which a coupling part is formed that extends outwardly in a radial direction from the insertion part, and in which an end of the coupling part is connected to an inner periphery of the valve casing;
the shaft whose one end is inserted and secured to the insertion part of the shaft support part, and whose other end is projected;
a valve in which the shaft is inserted in a center hole in a liquid-tight manner and is removably seated on the valve seat;
and
a biasing means that biases the valve in a seating direction, wherein
the valve of the check valve is arranged inside a bellows shaped flexible pipe body having a respective having metal flange at each end, and the collar part of the check valve is sandwiched between one of the metal flanges and a flange of piping facing the metal flange through an annular seal body;
and the shaft remains in a fixed position when the valve is opened and closed, wherein
the flexible pipe body is formed of stainless steel,
the flexible pipe body has a respective annular U-shaped ring at each end of the flexible pipe body, one of the annular U-shaped rings being proximal to an annular seal body and the other of the annular U-shaped rings being distal to the annular seal body, and each of the metal flanges is arranged at an outer periphery of the respective annular U-shaped ring, and wherein
the annular seal body is sandwiched between the collar part of the valve casing and the annular U-shaped ring which is proximal to the annular seal body, and the collar part is sandwiched between the metal flange and the flange of the piping facing the metal flange through the seal body
wherein
an annular passage is formed between the cylindrical part and the bellows shaped flexible pipe body,
and wherein
the collar part is of sufficient thickness to accommodate a bypass path, and wherein
a bypass path is formed in the collar part and openably communicates with an inlet/outlet port provided at an inner periphery of the cylindrical part at which the collar part is located with an inlet/outlet port provided at a flat surface of the collar part,
and wherein
the bypass path and the annular passage communicate with each other.

15 more elements

Dependencies are inferred from the claim text.

Description6,783 words

Summary2,656 words

#Field of the Invention

#The present invention relates to a structure of a check valve that can prevent water hammer and mechanical vibration.

#Description of the Related Art

Brief description of the drawings13 figures

#FIG. 1 is an exploded perspective view showing a first working example of a check valve used for the present invention;

#FIG. 2 is a longitudinal cross-sectional view showing a state where the check valve used for the present invention has been sandwiched between flanges 33 and 34, and has been inserted into a flexible pipe body 30, and it is an arrow cross-sectional view of FIG. 3 taken along a line II-II;

#FIG. 3 is an arrow view taken along a line III-III of FIG. 2;

Detailed description3,829 words

#Next, an embodiment of the present invention will be explained based on drawings.

#FIG. 1 is an exploded perspective view of a check valve of the present invention, and FIG. 2 is a longitudinal cross-sectional view after the check valve is attached to piping.

#(Structure of Valve Casing)

Facts

Application: 14/516,940Filed 17 Oct 2014
Priority: JP 2014-08706521 Apr 2014
Published: US 2015/0300518 A122 Oct 2015
Granted: 10 Jan 2017
Term ends: 19 Nov 2034
Estimated · howhide
20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 33 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification3 codes

F16K 27/0209
Of lift valves: check valves or pivoted valves
F16K 15/063
With guided stems: the valve being loaded by a spring
F16K
Valves

Family

US 2015/0300518 A1Pre-grant publication · published 22 Oct 2015
US 9,541,209 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

21 Apr 2014Priority claimedJP 2014-087065
17 Oct 2014Application filedUS 14/516,940
17 Oct 2014Assigned to Sankei Giken Co., Ltd.assignment of assignor's interest
22 Oct 2015PublishedUS 2015/0300518 A1
10 Jan 2017GrantedUS 9,541,209 B2
12 Oct 2026TodayWithin its term
19 Nov 2034Term endsEstimated, includes 33 days of adjustment

Citations

Flexible dual wall hose or pipe assembly1996US 5,556,679 AExaminer