JPH0662274U - Ball check valve - Google Patents

Abstract

(57) [Summary] [Purpose] A ball check valve has excellent sealing properties and durability, is easy to process, has low noise, and prevents water hammer from occurring during closing operation. [Configuration] Inlet 3 and outlet 4 at both ends of the valve box 2 in the linear direction
And a valve chamber 5 is provided between them, and a ball valve 6 made of rubber or resin is inserted into the valve chamber 5,
The valve receiving portion 7 is provided in a portion of the valve chamber 5 close to the outflow port, and a plurality of flow paths 5b that connect the valve chamber 5 and the outflow port 4 are provided around the valve receiving portion 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball type check valve for preventing fluid from falling in pipes and preventing backflow.

[0002]

[Prior art]

 Conventionally, a check valve is generally used to prevent backflow of fluid in piping.The structure is such that the valve is opened by the pressure of the fluid and closed by the weight of the valve as the pressure drops. It automatically opens and closes. Depending on the type of valve, a spring is used to improve opening and closing performance. Most of the materials are metal such as cast iron and bronze.Valve types include lift type, swing type, vertical lift type, ball type, Smolenski type, dual plate type, etc. for vertical piping and horizontal piping It is classified as used. As shown in FIG. 4, the ball check valve is a valve for horizontal piping, and a metal ball moves up and down along a guide to open and close. However, it is rarely used at present.

[0003]

[Problems to be solved by the device]

 Conventionally, a check valve used on the discharge side of a pump or the like is made of metal, and an impulsive sound may be generated when opening / closing due to a sudden change in fluid pressure. In addition, when the pump is stopped, the backflow is suddenly stopped, so a water hammer may occur. Water hammer absorption check valves (spring type swing valves, Smolenski type, etc.) are also used to prevent water hammer, but they are expensive. In addition, since the valve and valve seat are made of metal, precise processing is required to obtain sealing performance, and the sealing performance may deteriorate due to wear after use. The present invention has been made in view of these problems.The purpose of the present invention is to prevent the fluid from falling in the pipe and to prevent backflow, and also has excellent sealing performance and durability performance, and easy processing. The purpose is to provide a ball check valve for vertical piping that is inexpensive, inexpensive, and resistant to water hammer.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the check valve for vertical piping of the present invention is provided with an inflow port having a valve seat portion below the valve box, and a valve body (ball) made of rubber or resin in the center. A valve chamber in which a valve) is movably inserted is provided, and a plurality of flow paths that are not closed by a valve body that floats with a valve receiving portion are provided above and communicate with an outlet. Furthermore, the valve seat is tapered downward to extend the seating of the valve.

[0005]

[Action]

 According to the present invention, since the ball valve of the ball check valve is made of an elastic material such as rubber or resin, the ball valve rotates between the valve seat portion and the valve receiving portion when the pump is operated or stopped. Even if the inner wall of the valve box or the valve seat is hit, the impact force is mitigated and the impact noise is reduced because it is made of an elastic material. Also, because the ball valve is made of an elastic material, it is flexible and fits well on the valve seat, and even if the machining accuracy of the valve seat is a little poor, the sealing performance is not impaired and the valve seat is hit by the impact of the ball valve. Little wear on parts. In addition, the ball valve is formed between the valve seat portion and the valve chamber so that the ball valve is rotatable, and the valve seat portion is opened and closed while freely rotating the ball valve. When the fluid in the pipe turns into reverse flow due to the free movement of the valve and the opening and closing of the valve seat taking a little time, the reverse flow is slowly blocked.

[0006]

【Example】

 An embodiment of the ball check valve of the present invention will be described with reference to the drawings. The ball check valve of the present invention is used, for example, in the water pumping apparatus shown in FIG. In the pumping device, the pump P is operated to pump water from the underground drainage tank a through the pipe c, and drain the water to the drainage groove b on the ground through the pipe d in which the ball check valve e and the gate valve f are connected. You can do it. The ball check valve e prevents the drainage sent above it from flowing back to the drain tank a side. FIG. 1 is a vertical sectional view showing a first embodiment of the ball check valve of the present invention. The ball check valve divides the valve box 2 made of metal such as cast iron or bronze into three parts, and the inflow port 3 and the outflow port 4 are provided at both ends on a straight line of the valve box 2, and the inflow port and the outflow port are separated. A valve chamber 5 is provided between them, and an inspection lid 1 is provided on the outer peripheral portion of the valve chamber 5. The inflow port 3 below the valve box 2 communicates with the pump side, and the outflow port 4 above the valve box 2 communicates with the drain side. A valve seat part 5a supported by a stay is formed inside the inflow port 3, a valve receiving part 7 is provided inside the valve chamber 5 inside the outflow port 4, and the valve chamber 5 is provided on the outer periphery of the valve receiving part 7. There are provided a plurality of flow paths 5b communicating with the outflow port 4. A ball valve 6 made of an elastic material such as rubber or resin is inserted into the valve chamber 5, and the ball valve 6 is rotatably movable in the valve chamber 5. The ball valve 6 is freely moved to open and close the inlet of the valve seat 5a. Then, when the pump operates, the flowing water moves in the direction of the arrow shown in the figure to reach the valve seat portion 5a from the inflow port 3 and push up the ball valve 6 from the valve seat portion 5a to open the inflow port. The ball valve 6 moves while rotating in the valve chamber 5 and is stopped by the valve receiving portion 7. Then, the running water enters the valve chamber 5 through the inflow port 3, and is drained from the valve chamber 5 through the flow path 5b through the outflow port 4. When the pump stops, the flow of water stops and the pushing force of the ball valve 6 disappears. Due to the weight of the ball valve 6 and the falling pressure of the falling water from inside the pipe above the ball valve 6, etc. The ball valve 6 located in the valve chamber 5 rotates in the valve chamber 5 for a while to close the valve seat 5a, thereby preventing the valve chamber 5 from falling.

FIG. 2 is a vertical cross-sectional view showing a second embodiment of the ball check valve of the present invention, which is a valve seat portion 5a and a valve chamber provided at the inlet 3 of the ball check valve of the first embodiment. The length up to the inlet of the valve 5 is increased so that the ball valve 6 slowly opens and closes the valve seat portion 5a. Therefore, a taper cylinder 8 having a larger diameter on the valve chamber side is formed between the valve seat portion 5a and the inlet of the valve chamber 5 so that the inner diameter of the taper cylinder 8 on the valve seat portion side is approximately the outer diameter of the ball valve 6. Formed. Further, the axial length of the tapered cylinder 8 is set to, for example, about 3 times the diameter of the ball valve 6 so that the ball valve 6 slowly opens and closes the valve seat portion 5a. Other configurations and operations are the same as those in the first embodiment, and the same numbers are given to the same components.

[0008]

EFFECTS OF THE INVENTION According to the present invention, since the ball valve forming the ball check valve is made of an elastic material such as rubber or resin, the ball valve rotates in the valve chamber when the pump is operated or stopped. Even if the valve box is hit with a valve, it is made of an elastic material, so the impact force is mitigated and the impact noise is reduced, reducing the noise compared to conventional check valves. Also, since the ball valve is made of an elastic material, it is flexible and sits comfortably, so even if the valve seat machining accuracy is a little poor, the sealability is not compromised and precision machining is not required, so it is inexpensive. , The valve seat is less worn by hitting the ball valve and has good durability. Furthermore, since the valve chamber is formed in a size that allows the ball valve to move freely, and the valve is opened and closed while freely rotating the ball valve, the valve can move freely and the valve seat can be opened and closed. When the fluid in the pipe turns into reverse flow due to a slight delay, the reverse flow is slowly blocked and water hammer is less likely to occur.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of a ball check valve according to the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the ball check valve of the present invention.

FIG. 3 is a piping system diagram showing a method of preventing water from falling around piping around a pump.

FIG. 4 is a vertical sectional view showing a conventional ball check valve.

[Explanation of symbols]

 2 Valve box 3 Inlet 4 Outlet 5 Valve chamber 5a Valve seat 6 Ball valve

Claims (2)

[Scope of utility model registration request] 1. An inflow port having a valve seat portion and an outflow port are provided at both ends of the valve box in a straight line direction, and a valve chamber is provided in the center of the valve box, and a ball valve made of rubber or resin is provided therein. A ball, which is movably inserted, has a valve receiving portion provided inside a valve chamber inside the outlet, and has a plurality of flow passages around the valve receiving portion that connect the valve chamber and the outlet. Type check valve. 2. A taper cylinder having a large diameter on the valve chamber side is formed between the valve seat portion and the inlet of the valve chamber, and the inner diameter of the end portion of the taper cylinder on the valve seat portion side is substantially outside the ball valve. The ball check valve according to claim 1, wherein the ball check valve is formed to have a diameter.