JPH08507U - Lift type quick closing check valve - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a lift-type quick-close check valve that is lightweight, inexpensive, and easy to assemble. SOLUTION: A valve seat plate (20) made of a steel plate, in which a valve seat (21) is projectingly provided on the downstream side of a central portion and a flange portion (22) is formed around the valve seat (21), and a valve. A working body (A) in which a rod (25) and a valve body (24) made of a steel plate in which an elastic member is molded are integrated, and a boss portion (fitting a bush (26) of the elastic member at the upper end portion ( 31) is formed, and a plurality of legs (34) extend in the upstream direction from the boss (31), and the lower end thereof is the flange (2) of the valve seat plate (20).
The spring retainer (30) made of a steel plate fixed to 2) is provided, and the bush (26) fitted in the boss (31) of the spring retainer (30) is slidable on the top of the valve rod (25). Supported on the bush (26) and valve body (24)
A coil spring (27) is interposed between the valve body (2 and
4) abut the valve seat (21).

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a lift-type quick-close check valve, and more particularly to a lift-type quick-close check valve used in a discharge collecting pipe of a water supply facility.

[0002]

[Prior art]

 As shown in FIG. 9, a conventional lift-type quick-close check valve has a valve body 4 seated on a valve seat 2 provided in a valve box 1 forming a flow path via a rubber sheet 3, The rubber sheet 3 and the valve body 4 are attached to the valve rod 8 by the valve lid 5, the nut 6 and the split pin 7, and the coil spring 10 is interposed between the bush 9 fitted to the valve rod 8 and the valve body 4. The bush 9 is supported by a spring retainer 12 fixed to the valve box 1 with a set screw 11, and only the flow from the upstream side (lower side in the figure) to the downstream side (upper side in the figure) is allowed. . In the figure, reference numeral 13 is an O-ring, and 14 is a bypass valve.

In the above-mentioned conventional valve, the valve box 1, the valve body 4, the valve lid 5 and the spring retainer 12 are cast products, are heavy, require machining, and are expensive, and the components 3 to 8 are assembled. It is troublesome to carry out the assembly work in which the coil spring 10 is seated, the bush 9 is fitted on the valve rod 8, the spring retainer 12 is set, and the spring retainer 12 is fixed to the valve box 1 with the set screw 11.

In recent years, water supply facilities having a plurality of pumps mainly operate one pump or a system that operates a plurality of pumps depending on the amount of water used. . Such a water supply system requires the provision of a discharge collecting pipe, and water is supplied to a pump that rests when a state in which a plurality of pumps are operating is changed to a state in which only one pump is operating. A check valve must be installed side by side with the discharge collection pipe to prevent backflow. Here, the check valve must be a quick-close check valve in order to prevent impact noise and vibration due to the water hammer.

However, as described above, the conventional quick-close check valve has a large weight, and in addition to this, leakage easily occurs at the flange portion. Therefore, there is a problem that the work of installing the quick-close check valve, which should be originally simple, becomes very complicated and the work effort becomes extremely large.

As another conventional technique, in Japanese Utility Model Publication No. 63-48846, a valve body and a valve rod are integrated into a circular valve seat plate having a valve seat on the downstream side of the central portion. The operating member is seated, the coil spring is interposed between the valve and the valve body, and the spring retainer having the support portion of the valve rod is fixed to the valve seat plate via the blade plate to form an assembly. However, a check valve is shown that attaches the assembly to the valve housing. Also, Japanese Utility Model Laid-Open No. 55-1 66952 discloses a technique in which a valve seat plate and a spring retainer of a check valve are made of steel plates. Japanese Unexamined Patent Publication No. 52-16020 discloses a technique of interposing an elastic member on a support portion of a valve rod in a check valve. Further, Japanese Utility Model Laid-Open No. 52-82929 discloses a technique in which the check valve is a lift type quick-close check valve. Further, Japanese Utility Model Laid-Open No. 60-100594 discloses a technique in which a check valve is provided in a pipe connecting a plurality of pumps.

However, in these techniques, since the valve box and the valve seat are separate parts, it is necessary to press-fit the valve seat into the valve box, which causes an increase in assembly cost. Further, in these technologies, the upstream side and the downstream side were partitioned by an annular projection formed in a part of the valve box and protruding inward of the flow path, that is, a part of the valve box (seated (Excluding the position occupied by the valve body). Further, since such an annular protrusion has to be formed, there is a problem that the shape of the valve box becomes complicated and the manufacturing / processing cost rises.

[0008]

[Problems to be solved by the device]

 The present invention has been proposed in view of the above-mentioned problems of the conventional technology, and an object thereof is to provide a lift-type quick-close check valve that is lightweight, inexpensive, and easy to assemble.

[0009]

According to the lift type quick closing check valve of the present invention, a valve seat (21) is provided on the downstream side of the central opening (C) so as to project therefrom. A valve seat plate (20) made of a steel plate having a circular flange portion (22) formed on the outer periphery in the radial direction is provided, and an elastic member is formed around the valve rod (25) and its valve body side end portion. The valve body (24) made of a steel plate is provided with an operating body (A), and a boss portion (31) into which a bush (26) of an elastic member is fitted is formed at the upper end portion, and the boss portion (31) is formed. 31) A plurality of legs (34) are expanded in diameter from a cylindrical base (33) fitted to the outside of the base (31) and extend in the upstream direction, and the lower end thereof is the flange () of the valve seat plate (20). 22) is provided with a spring retainer (30) made of a steel plate that is fixed at a predetermined width inward from the peripheral edge thereof. The leg portion (34) and the base portion (33) of 30) are integrally provided with arc surface portions (36, 37) that open toward the downstream side and are fitted to the boss portion (31) of the spring retainer (30). The top of the valve rod (25) of the working body (A) is slidably supported by the bush (26) of the elastic member, and the bush (26) and the valve body (24) of the working body (A) are slidably supported. A coil spring (27) is interposed between the valve seat (21) and the valve seat (21), and the valve seat plate (20), the working body (A), and the coil spring (27). , And the spring retainer (30) form an integrated assembly (B). Therefore, the water pressure applied to the valve body opens the valve body against the urging force of the coil spring, and the water flows from the opening of the valve seat plate through the spring retainer. When the water flow is stopped, the coil spring causes the valve element to sit on the valve seat and close the valve, preventing backflow.

The valve seat provided on the valve seat plate has a small head loss because it is provided so as to project in the direction of flow, and an elastic member is formed on the abutting valve element to ensure the seal. And prevent noise while sitting. The spring retainer is divided into multiple legs, and a sufficient flow passage area can be secured between them.The circular arc surface that is integrally projected on the legs and the base prevents water flow collision and turbulent flow, resulting in loss. Reduce head. The bush of the elastic member reduces the sliding resistance of the valve rod and prevents noise.

Since the assembly is formed by assembling the members obtained by processing a steel plate, it is lightweight and inexpensive, and if it is made of stainless steel, contamination due to rust can be prevented. Moreover, since the moving body is light in weight, the responsiveness is good and quick and reliable operation is performed.

Further, since the assembly is simply mounted in the pipe, the mounting work is easy and reliable, and it is possible to contribute to the reduction of the configuration and installation cost of the water supply system and the improvement of reliability.

[0013]

[Embodiment of device]

 An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, a circular flange portion 22 is formed on a valve seat plate 20 made of a stainless steel (SUS304) steel plate, and a press working is performed on the downstream side (upper side in the drawing) of the central opening C. A valve seat 21 is provided so as to project from the valve seat 21. On the valve seat 21, an operating member generally designated by A is seated.

In the operating body A, a rubber sheet 23, which is an elastic member that abuts on the valve seat 21, is molded and joined, and a stainless steel (SUS304) steel plate valve body 24 covered with the rubber sheet 23 is made of stainless steel (SUS304). The boss portion 25 ′ of the valve manufacturing rod 25 is formed by welding and joining the end face portion. The valve rod 25 and the valve body 24 may be integrated by screwing with a bolt b as shown in FIG.

The top of the valve rod 25 is supported by an elastic member, for example, a bush 26 made of synthetic resin in a sliding manner, and a coil spring 27 is interposed between the bush 26 and the valve body 24. ing. The bush 26 is fitted to a boss portion 31 fitted to the upper end of the spring retainer 30, and the lower end portion of the spring retainer 30 is fixed to the flange portion 22 of the valve seat plate 20, as will be described later. . Thus, the valve seat plate 20, the moving body A, the coil spring 27 and the spring retainer 30 are integrated to form an assembly B.

In FIGS. 5 and 6, a spring retainer generally designated by reference numeral 30 is formed of a stainless steel (SUS304) steel plate by press working, and has a cylindrical base portion 33 into which a boss portion 31 is fitted, and a base portion 33. It is composed of four legs 34 that integrally extend to the upstream side (downward in FIG. 5) and are fixed to the valve seat plate 20. The leg portion 34 is expanded from a neck portion 34a branched from the base portion 33 to form a shoulder portion 34b, and a large-diameter body portion 34c extends in the upstream direction, and a bent portion 35 at the lower end of the body portion 34c forms a shoulder portion 34b of the valve seat plate 20. The flange portion 22 is fixed by spot welding to a position inward from the periphery of the flange portion 22 by a predetermined width. Further, arcuate surface portions 36 and 37 that open toward the downstream side are integrally provided on the body portion 34c and the base portion 33 of the leg portion 34 so as to prevent a collision flow or a turbulent flow from occurring in the fluid.

As described above, since the assembly B is formed by integrally assembling members made by pressing a stainless steel plate, it is lightweight, inexpensive, and can prevent pollution due to rust, which is advantageous in terms of measures against red water.

Further, since the flange portion 22 of the valve seat plate 20 is flat within a predetermined width from the peripheral edge, the check valve of the check valve can be simply attached by sandwiching the peripheral edge portion of the flange portion 22 in the piping system. The configuration and assembly work can be performed extremely easily.

When the pump is operated, the water pressure applied to the valve body 24 opens the valve body 24 against the urging force of the coil spring 27, and the valve body 24 passes between the opening C of the valve seat plate 20 and the spring retainer 30. Water flows. When the water flow stops, the coil spring 27 causes the valve element 24 to sit on the valve seat 21 and close the valve, thereby preventing backflow.

In the above operation, since the valve seat 21 provided on the valve seat plate 20 is projected along the flow direction, the head loss is small. The boss portion 31 into which the bush 26 is fitted has a reduced diameter, and the spring retainer 30 is divided into a plurality of leg portions 34 so that a sufficient flow passage area is provided. Further, the smooth surface of the pressed stainless steel plate of the flow path and the arcuate surface portions 36 and 37 for preventing the occurrence of collision flow and turbulent flow, together with these, cause head loss as shown in FIG. The characteristic is C compared to the characteristic C1 of the conventional valve, and is greatly reduced.

A rubber sheet 23 is molded on the valve body 24 that abuts on the valve seat 21 to ensure a reliable seal and prevent noise when seated. The elastic member bush 26 reduces the sliding resistance of the valve rod 25 and prevents noise during operation.

The shape of the leg portion 34 of the spring retainer 30 forms a sufficient working space of the moving body A due to the body portion 34b and the shoulder portion 34c thereof, and the moving body A is lightweight and has good responsiveness, and is quick. Works reliably.

FIG. 8 shows a discharge collecting pipe of a water supply facility, which is an example of use of the present invention. A plurality of (two in the illustrated example) assemblies B are provided in the discharge collecting pipe 38 of the water supply facility. Although not clearly shown, the discharge collecting pipe 38 connects two pumps (not shown). In the assembly B, the flange portion 22 of the valve seat plate 20 is sandwiched and fixed between the flange portion 38a of the pipe 38 and the flange portion 39a of the elbow 39, and the O-ring 28 arranged on the outer periphery of the valve seat plate 20 is fixed. Ensures the watertightness.

[0025]

[Effect of device]

 Since the present invention is configured as described above, it has the following excellent effects.

(1) Since the valve seat plate, the valve body, and the spring retainer, which are the main components, are made of steel plates, they are lighter in weight than those that are cast products, and can be manufactured by press work at low cost. Can be manufactured. (2) Due to the structural shape of each of the parts and the smooth flow path surface formed by pressing the steel plate, head loss can be reduced. (3) Since the lower end of the spring retainer is fixed to the flange portion of the valve seat plate by being located inward of the predetermined width from the peripheral edge, the flange portion is clamped between the flanges of the pipes and the O A check valve can be installed by inserting a ring and simply bolting the flange of the pipe. Therefore, in combination with the weight reduction of the check valve, it is possible to drastically reduce the time and effort required to attach the check valve to the discharge collecting pipe of the water supply facility, which requires the installation of a plurality of check valves. (4) Not only can leakage between the upstream and downstream sides of the valve seat of the check valve be prevented, but also leakage from inside the pipe to the outside at the installation location can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a side sectional view of an assembly showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the valve seat plate of FIG. 1;

FIG. 3 is a side view of the moving body shown in FIG.

FIG. 4 is a side view of another embodiment of the operating body.

FIG. 5 is a side sectional view of the spring retainer of FIG. 1;

FIG. 6 is a top view of the spring retainer of FIG.

FIG. 7 is a drawing for comparing head loss characteristics.

FIG. 8 is a side sectional view of a discharge collecting pipe of a water supply facility which is an example of use of the present invention.

FIG. 9 is a side sectional view showing a conventional valve.

[Explanation of symbols]

 A ... Operating body B ... Assembly 20 ... Valve seat plate 21 ... Valve seat 22 ... Flange part 23 ... Rubber sheet 24 ... Valve body 25 ... Valve rod 26・ ・ ・ Bush 27 ・ ・ ・ Coil spring 28 ・ ・ ・ O ring 30 ・ ・ ・ Spring retainer 31 ・ ・ ・ Boss 33 ・ ・ ・ Base 34 ・ ・ ・ Legs 36, 37 ・ ・ ・ Arc surface

Claims (1)

[Scope of utility model registration request] A valve seat (2) is provided downstream of the central opening (C).
1) is provided so as to project, and a valve seat plate (20) made of a steel plate is provided, which has a circular flange portion (22) formed around the valve seat (21) in the radial direction. An operating body (A) in which a valve body (24) made of a steel plate around which an elastic member is formed is integrated is provided at the end portion on the valve body side, and a bush (26) of the elastic member is fitted to the upper end portion. A boss portion (31) is formed, and a plurality of leg portions (34) are expanded in diameter from a cylindrical base portion (33) fitted to the outside of the boss portion (31) and extend in the upstream direction. The lower end of the valve seat plate (20) is provided with a spring retainer (30) made of a steel plate fixed to the flange portion (22) at a predetermined width inward from the peripheral edge thereof, and the leg of the spring retainer (30) is provided. The arcuate surface portions (36, 3) that open toward the downstream side are provided on the portion (34) and the base portion (33).
7) is integrally protruded, and the spring retainer (30)
Bushing (2) of an elastic member fitted to the boss (31) of the
6) the top of the valve rod (25) of the operating body (A) is slidably supported, and the bush (26) and the operating body (A) are slidably supported.
A coil spring (27) is interposed between the valve body (24) and the valve body (24) to bring the valve body (24) into contact with the valve seat (21).
A lift-type quick closing reverse in which an integrated assembly (B) is constituted by the valve seat plate (20), the moving body (A), the coil spring (27), and the spring retainer (30). Stop valve.