JPH0750610Y2 - Discharge collective piping for water supply facilities - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a discharge collecting pipe using a lift type quick closing check valve used in a water supply facility.

[Prior Art] As is well known, in a water supply facility, a discharge collecting pipe in which discharge pipes from a plurality of pumps are collected is used. A check valve is provided on the discharge side of the pump.

FIG. 10 shows an example of a conventional lift type quick-close check valve used for such a discharge pipe. In FIG. 10, a valve seat 32 is provided in a valve box 31 forming a flow path, and a valve element 34 seated on the valve seat 32 via a rubber sheet 33 is provided with a valve lid 35, a nut 36, and a split nut. It is attached to valve stem 38 by pin 37. A coil spring 40 is interposed between the bush 39 on which the valve rod 38 slides and the valve body 34, and the valve body 34 is pressed against the valve seat 32. The bush 39 is supported by a spring retainer 42 fixed to the valve box 31 by a set screw 41. The other 43 is an O-ring, and 44 is a bypass valve.

The lift type quick closing check valve is provided in the discharge collecting pipe of the water supply facility, and when a pump (not shown) is operated, the valve element 34 opens against the spring force of the spring 40, which is the lower side in the figure. Water flows from the upstream side to the downstream side, which is the upper side in the figure. When the pump is stopped, the spring 40 causes the valve element 34 to sit on the valve seat 32 and close the valve to prevent water from flowing back to the resting pump.

The lift type quick-close check valve described above includes a valve box 31, a valve body 34, and a valve lid 3
5. The spring retainer 42 is a cast product and is heavy, and it requires machining to manufacture, resulting in high cost. In addition, the assembly work is troublesome because the parts 33 to 38 need to be assembled.

Further, 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 collection pipe, and water flows backward to a pump that rests when multiple pumps are operating and only one pump is operating. To prevent this, a check valve must be provided for each pump side pipe. Here, the check valve must be a quick-close check valve to prevent impact noise and vibration due to the water hammer.

However, the conventional quick-close check valve is a cast product and has a large weight, and in addition, leakage is likely to occur at the flange portion which is a connection point with the pipe. For this reason, there has been a problem that the work of attaching the quick-close check valve, which should be simple, to the discharge collecting pipe is complicated, and the work effort increases accordingly.

Therefore, the present applicant has previously proposed a check valve in which a valve box, a valve seat, a valve body and the like are pressed with a steel plate (Japanese Utility Model Publication No. 55-166952). According to this check valve, the weight can be reduced and the cost can be reduced as compared with the check valve whose component is a cast product. However, the previously proposed check valve does not take any particular measures for mounting on the pipe, and problems such as leakage at the mounting portion and troublesome mounting work have not been solved yet.

[Problems to be solved by the invention] Therefore, an object of the present invention is to provide a water supply facility using a lift-type quick-close check valve that can be easily installed on a pipe and can prevent leakage at the installation location. To provide a discharge collection pipe.

[Means for Solving the Problems] According to the discharge collecting pipe of the water supply facility of the present invention, a valve seat formed by projecting a central opening on the downstream side in the discharge collecting pipe of the water supply facility and the valve seat thereof. A valve seat plate made of a steel plate consisting of a flange provided around the valve body, a valve plate made of a steel plate in which an elastic member is molded, a valve rod integrated with the valve body, and the valve rod penetrating and sliding. A bush of an elastic member that moves and a spring retainer made of a steel plate that holds a spring that presses the valve body against the valve seat are provided, and the spring retainer has a lower end on the flange of the valve seat plate, from the flange periphery. A lift-type quick-close check valve, which is fixed and fixed inward by a predetermined width, is provided, and the flange of the valve seat plate is clamped by the flanges of the mutually connected pipes and O It has a ring.

[Operation] The lift type quick-close check valve is attached to the discharge collecting pipe of the water supply facility by sandwiching the flange of the valve seat plate with the flange portion of the pipes connected to each other, and mounting the O-ring on the outer periphery of the flange. . As a result, the discharge collecting pipe becomes a check valve valve box. When the pump is operated in this state, the valve body opens against the spring force of the spring, and water flows from the pipe on the pump side to the discharge collecting pipe through the opening of the valve seat plate and then the gap of the spring retainer. When the pump is stopped, the spring causes the valve element to sit on the valve seat and close the valve, preventing backflow of water into the resting pump line.

The check valve can be attached to the discharge collecting pipe by simply inserting an O-ring in the flange portions of the pipes connected to each other and sandwiching the flange of the valve seat plate of the check valve. Installation of the check valve is extremely easy. Further, the check valve is attached to the discharge collecting pipe because the O-ring is interposed between the flange portions of the pipes connected to each other as described above, and the flange of the valve seat plate of the check valve is sandwiched. Not only prevent leakage between the upstream side and the downstream side of the check valve valve seat plate, but also prevent leakage from inside the pipe to the outside at the location where the check valve is installed. Surely prevent leakage from the inside of the pipe to the outside at the location where is provided.

[Embodiment] In FIGS. 1 to 3, a valve seat plate generally designated by 1 is formed by projecting a central opening 2 downstream (upward in the drawing) as shown in FIG. It consists of a valve seat 3 and a flange 4 provided around the valve seat 3, and has a circular stainless steel (SU
S304) It is made by pressing a steel plate.

The spring retainer indicated by 5 is also made of stainless steel (SUS304).
It is manufactured by pressing from steel plate, and its lower end 8
In the above, it is fixed to the flange 4 of the valve seat plate 1 by being located inward from the peripheral edge of the flange by a predetermined width W. The spring retainer 5 will be described in detail later.

As shown in FIG. 3, the moving body indicated by 11 is composed of a valve body 12 made of stainless steel (SUS304) steel plate and a valve rod 13 made of stainless steel (SUS304) integrated with the valve body 12. ing. A rubber sheet 15, which is an elastic member, is molded and joined to the valve body 12 to sit on the valve seat 3, and the valve rod 13 has a boss portion.
The end faces of 14 are welded to the valve body 12 and integrated with the valve body 12. The valve rod 13 and the valve body 12 may be integrated with each other by screwing with a bolt 16 as shown in FIG.

A boss 17 is attached to the upper end of the spring retainer 5, and an elastic member such as a synthetic resin bush is attached to the boss 17.
18 is inserted and the valve rod 13 slides in the bush 18. A coil spring is provided between the bush 18 and the valve body 12.
19 is interposed and urges the valve body 12 so as to come into pressure contact with the valve seat 3.

5 and 6 show details of the spring retainer 5 holding the valve rod 13, the coil spring 19, the bush 18 and the like integrated with the valve body 12, and the spring retainer 5 is a boss 17.
Is formed of a tubular base portion 6 and four leg portions 7 which are integrated with the base portion 6 and are formed so as to expand in diameter upstream (downward in FIG. 5). The lower end of the leg portion 7 is bent outward, and the bent portion 8 is welded to the flange 4 of the valve seat plate 1 in the above-mentioned state. Further, arcuate surface portions 9 and 10 which open toward the downstream side are integrally provided on the base portion 6 and the leg portions 7 so as to prevent a collision flow or a turbulent flow from being generated in the fluid.

As described above, the valve seat plate 1, the valve body 12, the valve rod 13, the spring retainer 5, etc. are made of stainless (SUS304) material,
Contamination due to rust can be prevented, which is advantageous for measures against red water.

FIG. 7 shows a state in which the above-mentioned lift type quick-close check valve is attached to the discharge collecting pipe of the water supply facility, and at the joint between the elbow pipe 21 and the discharge collecting pipe 23 connected to the pump side (not shown). The aforesaid lift type quick-close check valve, which is generally indicated by A, is attached. The mounting mode is such that the flange portion 22 of the elbow pipe 21 and the flange portion 24 of the discharge collecting pipe 23 sandwich the flange 4 of the valve seat plate 1 of the check valve A, and the O-ring 25 is provided on the outer periphery of both sides. It is attached by bolting the flange portions 22 and 24. The discharge collecting pipe 23 is a valve box of the check valve A.

When a pump (not shown) is operated, the valve body 12 opens against the spring force of the spring 19 of the check valve A, the opening 2 (FIG. 2) of the valve seat plate 1 and the clearance (6th position) after the spring is pressed. (Figure)
After that, water flows from the elbow pipe 21 which is the pipe on the pump side to the discharge collecting pipe 23. Spring 19 when pump stops
As a result, the valve body 12 is seated on the valve seat 3 (FIG. 1) of the valve seat plate 1 and the valve is closed to prevent backflow of water to the resting pipe of the pump.

The check valve A is attached to the discharge collecting pipes 21 and 23 by connecting the O-ring 25 between the flange portions 22 and 24 of the pipes 21 and 23 connected to each other.
To sandwich the flange 4 of the valve seat plate 1 of the check valve A,
Since it suffices to tighten the flange portions 22 and 24 of the pipes 21 and 23 with bolts, the check valve mounting operation becomes very easy. Further, since the check valve A is attached to the discharge collecting pipes 21 and 23 as described above, the check valve A is provided between the upstream side and the downstream side of the valve seat plate 1 as shown in FIG. Not only does this prevent leakage "a", but it also reliably prevents leakage "b" from the inside of the pipes 21, 23 at the location where the check valve A is provided.

In addition, the smooth passage surface of the pressed stainless steel plate and the arcuate surface portions 9 and 10 for preventing the occurrence of collision flow and turbulent flow
(FIGS. 5 and 6), the head loss is greatly reduced as shown by the characteristic C in FIG. 9 as compared with the characteristic C1 of the conventional check valve.

[Effects of the Invention] The present invention has the following excellent effects.

(1) Since the valve seat plate, valve body, and spring retainer, which are the main components of the lift-type quick-close check valve, are made of steel plate, the check valve is lighter than the ones in which those parts are cast products. Moreover, since it can be manufactured by press working, the cost can be reduced.

(2) Since each of the above parts can be manufactured by pressing a steel plate, a smooth flow path surface can be obtained and head loss can be reduced.

(3) Since the rubber sheet applied to the valve body is joined by the mold, it is not necessary to attach the rubber sheet to the valve body by using the pressing plate.

(4) At the lower end of the spring retainer, the spring retainer is fixed to the flange of the valve seat plate by being located inward from the peripheral edge of the flange by a predetermined width, and the flange of the valve seat plate is connected to the discharge collecting pipes. Clamp it with the flange of the piping
A non-return valve can be attached by mounting an O-ring on the outer periphery of the flange of the valve seat plate and tightening the flange portion of the pipe with bolts. It is possible to greatly reduce the time and effort required to install the check valve in the discharge collecting pipe of the water supply facility, which requires the installation of individual lift-type quick-close check valves.

(5) Since the structure for mounting the lift-type quick-close check valve to the discharge collecting pipe is as described above, not only is it possible to prevent leakage between the upstream side and the downstream side at the valve seat portion of the check valve. , It is possible to reliably prevent leakage from the inside of the pipe to the outside at the location where the check valve is provided.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a part of a lift type quick check valve according to the present invention in plan view, FIG. 2 is a side sectional view of a valve seat plate of FIG. 1, and FIG. 3 is FIG. 4 is a side view showing a part of the valve body and the valve rod in section, FIG. 4 is a side view showing the part of another example of the valve body and the valve rod in section, and FIG. 5 is a view of the spring retainer of FIG. Fig. 6 is a side sectional view showing a part in a plane, Fig. 6 is a plan view of Fig. 5 seen from above, and Fig. 7 is a discharge of a water supply facility equipped with a lift-type quick-close check valve according to an embodiment of the present invention. FIG. 8 is a side sectional view showing a part of the collecting pipe in a plan view, FIG. 8 is a side sectional view showing a leak preventing structure in a pipe flange portion to which a lift type quick closing check valve is attached, and FIG. 9 is a lift implementing the present invention. Drawing for comparing the head loss characteristics of the conventional quick-type close check valve and the conventional lift-type quick-close check valve, and FIG. 10 is a side sectional view showing a part of the conventional lift-type quick-close check valve in a plane. . 1 ... Valve seat plate, 2 ... Central opening, 3 ... Valve seat, 4 ...
… Flange, 5 …… Spring retainer, 12 …… Valve body, 13…
… Valve, 18 …… Bush, 23 …… Discharge collective piping, 25 ……
O-ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Kawaguchi 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Inside the EBARA CORPORATION (56) References JP-A-52-16020 (JP, A) -166952 (JP, U) Actual open Sho 52-82929 (JP, U) Actual open Sho 60-100594 (JP, U) Actual open Sho 52-129025 (JP, U) Actual public Sho 63-48846 (JP, Y2 )

Claims (1)

[Scope of utility model registration request] 1. A valve seat plate made of a steel plate, comprising a valve seat formed by projecting a central opening on the downstream side in a discharge collecting pipe of a water supply facility and a flange provided around the valve seat, A valve body made of a steel plate in which an elastic member is molded, a valve rod integrated with the valve body, a bush of the elastic member through which the valve rod penetrates and slides, and the valve body is pressed against the valve seat. A spring retainer made of a steel plate for holding a spring is provided, and the spring retainer is fixed at its lower end to the flange of the valve seat plate by being fixed inward by a predetermined width from the peripheral edge of the flange. A discharge check of a water supply facility, characterized in that a close check valve is provided, and the flange of the valve seat plate is sandwiched by the flanges of the mutually connected pipes, and an O-ring is provided on the outer periphery thereof. Piping.