JP2542768B2 - Water pressure control valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water pressure control valve for controlling the water pressure in a piping system in a water supply facility for buildings to a constant pressure.

[0002]

2. Description of the Related Art In a water supply system using a pressure tank to automatically operate a pump, its discharge pressure usually changes depending on the characteristics of the pump, but because of pressure fluctuations, malfunctions in the water heater and changes in the shower water temperature occur. . To prevent this, there is a water supply device with a constant discharge pressure by a variable speed pump. However, the water supply device using the variable immediate pump generally has high equipment costs, and maintenance and running costs for pump control equipment and the like are also high.

Therefore, recently, in a water supply system for small and medium-sized buildings, an economical and compact water supply system with less pressure fluctuation is desired. The water pressure control valve disclosed in Japanese Examined Patent Publication No. 57-35483 is one that meets this requirement. It contains a central shaft in a housing, a throttle valve with a check valve at one end and a balance mechanism with a balancing piston that slides in the housing at the other end. , The throttle valve and the balancing piston are provided with an inlet water passage in the middle part, and water pressure is exerted so as to work from the central axis side to the end face side, and the opening of the throttle valve is adjusted by the balancing piston. It is a water pressure control valve.

[0004]

The water pressure control valve is constructed so that the water pressure in the discharge water passage can be maintained substantially constant. By the way, in such a water supply device, it is necessary to preliminarily send and store water into the pressure tank of the water supply piping system. This is done while the pump is running and while the throttle valve is closed, but the pump is stopped when the pressure on the discharge waterway side reaches a certain value. Is always fitted with a check valve. However, in the above conventional example, the check valve is integrally incorporated in the throttle valve, and the structure is complicated. Further, since the check valve cannot be made large in this structure, there is a problem that the flow path is small and the amount of water supplied is limited, and it takes a long time to supply water into the pressure tank. In addition, since the axes of the inlet water channel and the outlet water channel of the housing are not housed on the same axis, it is difficult to actually perform the piping work and the maintenance work is difficult.

The present invention solves the above-mentioned problems, and does not provide a single check valve in the piping system, but is compact and has a simple structure, and the water pressure control is performed in the end pipe of the discharge water channel to perform the correct constant pressure control. The purpose is to provide a valve.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a valve body is provided on a housing body having an inlet water channel and a discharge channel, and a shoji wall that separates the inlet channel and the discharge channel in the housing. A throttle valve portion for opening and closing the valve seat portion,
It has a balancing piston portion provided through a central shaft so as to operate integrally with the throttle valve portion, and cylinder chambers are provided on both sides of the balancing piston portion, and the cylinder chambers communicate with each other through a small hole. The balance mechanism that is being operated and the other of the cylinder chambers is always in communication with the inlet water passage, and the pressure for adjusting and maintaining the fluid pressure in the other cylinder chamber located on the valve seat side to a desired pressure. It consists of an adjusting device and enables the flow of fluid to the outlet channel when the inlet channel pressure is higher than the outlet channel pressure, and stops the fluid flow when the outlet channel pressure exceeds the inlet channel pressure. This is a water pressure control valve provided with the check valve device on the shoji wall.

[0007]

In the present invention, since the check valve device is arranged on the shoji wall in the housing as described above, the ability and type of the check valve can be freely selected regardless of the size of the throttle valve. . Therefore, the water pressure control valve as a whole is compact and low in cost. Further, since the inlet water channel and the outlet water channel are on the same coaxial line, piping work is easy and maintenance such as a check valve is easy. Further, the assembling of the balance mechanism to the housing can be easily performed from the upper part of the housing.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of the water pressure control valve of the present embodiment, in which an inlet water channel 1 having a flange 3 and an outlet water channel 2 having a flange 3a are provided on a coaxial line, and at the outlet water channel side A valve member 5 composed of a central shaft 13, a throttle valve 10 and a balancing piston 14 in a direction perpendicular to
A piston chamber 6 serving as a cylinder chamber and a balancing piston end chamber 6c are provided on both upper and lower sides of the balancing piston 14 so as to be slidable integrally, and these are communicated with each other through a small hole 14a. Introducing ports 24 and 24a for guiding water to the end chamber 6c are formed. The flanges 3 and 3a provided on the main body 4 are connected to the discharge side flange of the pump and the secondary side flange of the water supply pipe or the like by a bolt through a gasket. The valve member 5 has a throttle valve 10 having a guide bar portion 10b having a slit on a part of the circumference at one end of a central shaft 13, a valve seat 11 made of a flexible material, and an upper valve body 12 fixed to the valve member 5. At the other end, a balancing piston 14 is constituted by a snap ring 25. The outer diameter of the valve body 12 of the throttle valve is 4
About 1.5 times the inner diameter of a, which is relatively large compared to the conventional control valve, so that the fluid receives sufficient lift when flowing through the opening between the valve body 12 and the valve seat 4a to the discharge channel 2. Therefore, the flow rate can be obtained with good responsiveness.

As shown in FIG. 1, in the valve member 5, the balancing piston 14 engages with the slide portion 6a of the piston chamber 6, the central shaft 13 engages with the central shaft sliding portion 6b, and the throttle valve 10 Engages with the valve seat portion 4a and is supported so as to be slidable in the direction perpendicular to the discharge channel. Also, the balancing piston
At least one small hole 14a for communicating the balancing piston end chamber 6c with the piston chamber 6 is formed in the hole 14. Further, an O-ring 16a and a stopper ring 16b surrounding the outer circumference of the O-ring are attached to a groove provided on the circumference of the balancing piston 14 to slidably seal between the balancing piston 14 and the sliding portion 6a. There is.

Further, at the shoji wall 4c, which is provided with a valve seat 4a and separates the inlet water channel and the outlet water channel, at least one small hole 10a communicating with the inlet water channel 1 and the outlet water channel 2 is opened, and the shoji wall is A check valve body 61, a check housing 62 for preventing the fluid from flowing from the discharge channel 2 side to the inlet channel 1 side through the small hole 10a on the discharge channel 2 side of 4c.
A check valve device 60 including a check spring 63 is assembled.

The pressure adjusting unit 30 includes a piston chamber 6 and a water passage 24.
A spring 19 is set between a diaphragm 26 fixedly attached to the center of the valve 17 and an adjusting nut 20, and is housed in a housing 22. Then, the adjusting screw whose one end is exposed from the housing 22 to the outside
Rotate 21 and adjust the force of the spring 19 by moving the adjusting nut 20. The housing 22 is fixed to the pressure adjusting portion mounting seat 8 provided on the main body 4 by a bolt or the like via a diaphragm 26. A fluid discharge port 18 having a threaded portion is provided on a side portion of the pressure adjusting portion mounting seat 8. Then, the fluid applies a fluid pressure from the piston chamber 6 to the diaphragm 26 through the water passages 24c and 24d, and the opening degrees of the valve seat 4b and the valve 17 are automatically adjusted to the pressure adjusted by the spring 19. While passing through the water discharge passage 18a, the fluid discharge port 18
It is piped so that water is discharged from the pipe or is returned to the suction side water passage of the pump.

FIG. 3 systematically shows an example of a water supply device using the water pressure control valve according to the present invention. 4 is a water pressure control valve of the present invention, 40 is a water receiving tank, 41 is a suction pipe, 42
Is a pump, 45 is a water supply pipe to each faucet 50, 49 is a pressure tank,
Reference numeral 46 is a connecting pipe for the pressure tank 49. Further, 47 is a pressure switch for turning on and off the pump 42, and 48 is a pressure gauge. Further, a pipe 43 such as a hose or a pipe is connected from the fluid discharge port 18 of the pressure adjusting unit 30 of the water pressure control valve 4 to the suction side of the pump 42. In this way, excess water discharged from the pressure adjustment unit is returned to the pump suction side, so the valve of this pressure adjustment unit can always operate without back pressure. It is effective to make it almost the same as the roadside pressure.

Next, the operation will be described with reference to FIGS. 1 to 3. First, in FIG. 3, when the water faucet 50 is all closed and water is not used, the pump 42 is stopped, the check valve 60 in the water pressure control valve 4 is closed, and the pressure tank 49 has an appropriate amount. Water is stored and the water supply piping system 45 is pressurized by the pressure tank. At this time, the throttle valve 10 of the valve member 5 is also closed. When the faucet 50 is used, water is first supplied from the pressure tank 49, and when the pressure inside the pipe decreases to 0.2 to 0.5 Kgf / cm ² lower than the adjusted pressure to the operating set value of the switch 47, The pressure switch 47 activates the pump 42. Immediately after the pump 42 is activated, the water sent from the inflow port through the inlets 24 and 24a to the piston end chamber 6c is balanced and the small hole 14a of the piston 14 is balanced.
A back pressure is generated on the back surface of the balancing piston 14 through the passage, which becomes higher than the pressure on the discharge water channel 2 side, so that the valve member 5 is fully opened and water is supplied to the water supply pipe 45 through the throttle valve 10. When the pump is in operation, the water that has entered the water pressure control valve 4 is supplied through the throttle valve 10 and enters the piston chamber 6 through the small hole 14a of the balancing piston 14 and hits the diaphragm 26 through the water passages 24c and 24d. When the force of the spring 19 is exceeded, the valve 17 is pushed open,
The water is returned from the fluid discharge port 18 through the pipe 43 to the pump suction side to generate a substantially constant adjusted pressure in the piston chamber 6.

At this time, the throttle valve upper valve body 12 and the valve seat 4
As the opening degree of a increases, the pressure applied to the throttle valve side of the valve body 12 is apparently lower than the pressure when the valve body is closed, but the water flowing therethrough lifts the valve body 12 by the lift force. With the open valve body open, the lift force is combined with the force due to the pressure difference between the throttle valve side of the valve body 12 and the discharge channel side, and the pressure difference between the end face side and the back side of the balancing piston 14 Depending on the relationship of force, the valve member 5 balances to a certain position in the discharge channel,
The opening degrees of the throttle valve 10 and the valve seat 4a are determined. When the flow rate is high, the opening degree of the throttle valve 10 is large. On the contrary, when the flow rate is small, the opening degree is small, and the pressure in the discharge side waterway side pipe of the water pressure control valve is controlled to be substantially constant.

Next, when the water faucet 50 is closed and the use of water is stopped, the pressure in the discharge channel rises.
Closes. On the other hand, the water on the inlet side is a small hole 10a in the shoji wall 4c.
Push up the check valve body 61 of the check valve 60 through the discharge port water channel 2
And flows into the pressure tank 49. After that, when the pressure in the water supply piping system 45 reaches the pump stop pressure, the pump 42 is stopped by the pressure switch 47, and the check valve of the water pressure control valve.
60 closes and returns to its original state.

[0016]

Since the water pressure control valve of the present invention is provided with the check valve on the shoji wall in the housing, the structure of the water pressure control valve is simple and compact, and the maintainability is good.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a water pressure control valve according to the present invention.

FIG. 2 is a sectional view taken along the line A-A ′ in FIG.

FIG. 3 is a schematic system diagram of a water supply device using a water pressure control valve according to the present invention.

[Explanation of symbols]

 1 ... Inlet Channel 2 ... Discharge Channel 4 ... Water Pressure Control Valve 4a ... Valve Seat 4c ... Shoji Wall 5 ... Valve Member 6 ... Piston Chamber 6c ... Balance Piston End Chamber 10 ... Throttle Valve 12 ... Valve 13 ... Central Axis 14 ... Balancing piston 17 ... Valve 30 ... Pressure regulator 42 ... Pump 43 ... Piping 49 ... Pressure tank 60 ... Check valve

Claims (1)

(57) [Claims] 1. A housing main body having an inlet water channel and a discharge channel, and a valve seat portion provided on a shoji wall separating the inlet channel and the discharge channel in the housing, and opening and closing the valve seat section. A throttle valve section and a balancing piston section provided through a central shaft so as to operate integrally with the throttle valve section are provided, and cylinder chambers are provided on both sides of the balancing piston section, and the cylinder chamber has a small hole. And a balance mechanism that is in communication with each other via the other, and the other of the cylinder chambers is always in communication with the inlet water channel, and the fluid pressure and the desired pressure in the other cylinder chamber located on the valve seat side. When the inlet channel pressure is higher than the outlet channel pressure, it enables the fluid to flow to the outlet channel side and the outlet channel pressure exceeds the inlet channel pressure. A water pressure control valve, characterized in that a check valve device for stopping the flow of fluid when it is installed is provided on the shoji wall.