JPH0693213B2 - Water pressure control valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water pressure control valve for controlling the water pressure of a piping system in a building water supply facility or the like to a constant pressure.

[Prior Art] In a water supply device using a pressure tank to automatically operate a pump, its discharge pressure usually changes depending on the characteristics of the pump, but pressure fluctuations cause a malfunction of the water heater and a change in the shower water temperature. . 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 device for small and medium-sized buildings, an economical and compact water supply device with less pressure fluctuation is desired. As for those who respond to this request,
There is a water pressure control valve disclosed in 57-35483. This one accommodates a central shaft in the housing body, has a throttle valve with a check valve at one end, and a balance mechanism with a balancing piston that slides inside the housing at the other end. The throttle valve and the balancing piston are provided with an inflow port water passage in the middle, and water pressure is exerted so that they act from the central shaft 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.

[Problems to be Solved by the Invention] The water pressure control valve is configured so as to maintain the water pressure in the discharge water channel substantially constant.

However, if the water pressure in the pipe on the outlet waterway side decreases and the water flows with the throttle valve opening wide, the water flow also affects the central shaft and the balancing piston, resulting in a large pressure loss and the inside of the balancing piston. The correct water pressure on the pump side does not act on the cylinder chamber, and the balance is attempted to be balanced at a pressure lower than the constant maintenance pressure. That is, as the flow rate increases, the water pressure in the discharge port waterway side pipe tends to decrease.

In order to solve this, for example, the outside diameter of the valve body of the throttle valve is made larger than the inside diameter of the valve seat to increase the pressure receiving area that receives the fluid pressure, and the lift force is sufficiently generated so that the opening degree can be easily adjusted. It is possible to increase the flow rate by opening the actual opening of the throttle valve a little larger than that corresponding to the maintenance pressure. However, in the conventional water pressure control valve described above, the balance piston portion is located on the inlet side of the housing and slides in the housing because of the structure, so the pressure receiving area of the valve body is practically determined by the diameter of the balance piston. To be done. Therefore, with this structure, it is difficult to form the outer diameter of the valve body to be considerably larger than the inner diameter of the valve seat.

As described above, in the conventional control valve, the balance mechanism such as the throttle valve and the balancing piston connected through the central shaft is located on the inlet side, and the fluid flows into the middle portion of the central shaft. Because it has a structure,
As described above, the inflow water pressure directly acts on the balance mechanism such as the central shaft and adversely affects the pressure loss, and the sliding resistance of the valve member increases, so that a sensitive response to the change in the discharge port waterway side pressure cannot be achieved. Further, it is difficult to set the outer diameter of the valve body to a desired size with respect to the inner diameter of the valve seat. From the above, there was a problem with the constant pressure maintaining function. Moreover, the fluid resistance is increased, and a pulsation phenomenon may occur.

It is an object of the present invention to solve the above problems and provide a water pressure control valve that performs correct constant pressure control even in the terminal pipe of the discharge water channel without being adversely affected by the flow of fluid.

[Means for Solving the Problem] The present invention forms the inside of a housing body having an inlet water channel and a discharge channel in the inlet channel side chamber and the outlet channel side chamber through a valve seat portion, and A throttle valve that opens and closes,
It has a balancing piston portion provided through a central shaft so as to operate integrally with the throttle valve portion, cylinder chambers are provided on both sides of the balancing piston portion, and the cylinder chambers on both sides mutually pass through a small hole. In a water pressure control valve provided with a balance mechanism in communication, the balance mechanism is provided in the discharge port waterway side chamber, and in the cylinder chambers on both sides, in the cylinder chamber located on the side closer to the valve seat portion,
A water pressure control valve provided with a pressure adjusting device for adjusting and maintaining the indoor pressure to a desired pressure, and the other cylinder chamber having an inlet passage communicating with the inlet water passage so as to introduce the fluid pressure on the inlet side. Is.

Further, it is a water pressure control valve adapted to discharge or return the excess fluid adjusted by the pressure adjusting device to the suction side water passage of the pump.

[Operation] In the present invention, as described above, the balance mechanism is provided so as to be arranged in the discharge port waterway side chamber in the housing, and in the two cylinder chambers, the cylinder chamber located on the side closer to the valve seat portion, A pressure adjusting device for adjusting and maintaining the indoor pressure at a desired pressure is provided, and the other cylinder chamber is provided with an introduction passage communicating with the inlet water passage so that the fluid pressure on the inlet side is always introduced. Therefore, the fluid pressure on the inlet side is introduced into the both cylinder chambers from the other cylinder chambers through the small holes through the introduction passage, and when the pressure is adjusted and maintained at the desired pressure, the balancing piston is balanced and the throttle valve opens. The degree is automatically adjusted. In this case, since there is no pressure loss of the inflowing fluid pressure and the correct fluid pressure acts on the cylinder chamber, the opening degree of the throttle valve is controlled with good responsiveness according to the fluctuation of the inlet pressure.

In addition, since the outside diameter of the valve body can be made large without being restricted by the inside diameter of the valve seat, the pressure receiving area when the valve is opened is large, and the valve body will open even if the flow rate increases and the piping on the outlet waterway side Even when the internal pressure decreases, a sufficient flow rate can be secured, and the pressure on the discharge water channel side can be stably maintained constant until the end. Further, the balance mechanism can be easily assembled to the housing from the upper part of the housing.

Furthermore, since the excess water discharged from the pressure regulator is returned to the suction side water passage of the pump, the valve of this pressure regulator can always operate without back pressure, and the set pressure can be used as the discharge port water side pressure. It is effective to make them almost the same.

[Embodiment] Next, an embodiment according to the present invention will be described with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of the water pressure control valve of this embodiment, which shows an inlet water channel 1 having a flange 3 and a flange 3a.
Is provided on a coaxial line so that it can be slid integrally with the valve member 5 including the central shaft 13, the throttle valve 10 and the balancing piston 14 in the direction perpendicular to the outlet water channel 2 on the coaxial line. The piston chamber 6 and the balancing piston end chamber 6c, which serve as cylinder chambers, are provided on both upper and lower sides of the balancing piston 14.
Are provided to communicate with each other through the small hole 14a, and further, inlets 24 and 24a for guiding water from the inflow channel 1 to the balancing piston end chamber 6c are formed. Here, the inlet may be connected by a conduit such as a pipe.

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 includes a throttle valve 10 having a guide bar portion 10b having a slit on a part of the circumference at one end of the central shaft 13,
A valve seat 11 and an upper valve body 12 made of a flexible material are fixed, and a balancing piston 14 is provided at the other end with a retaining ring 25.
It is fixed and configured.

The outer diameter of the valve body 12 of the throttle valve is about 1.5 times the inner diameter of the valve seat portion 4a, which is a relatively large diameter as compared with the conventional control valve, and the fluid causes the opening between the valve body 12 and the valve seat 4a to flow. A sufficient amount of lift is applied when flowing into the passage outlet channel 2 so that the flow rate can be obtained with good responsiveness.

As shown in FIG. 1, the valve member 5 is a balancing piston.
14 engages with the slide portion 6a of the piston chamber 6, and the central shaft 13
Is engaged with the central shaft sliding portion 6b, and the throttle valve 10 is engaged with the valve seat portion 4a so that the throttle valve 10 is slidably supported in the direction perpendicular to the discharge water channel. Further, the balancing piston 14 is provided with at least one small hole 14a for communicating the balancing piston end chamber 6c with the piston chamber 6. Here, the small hole may be provided so that the balancing piston end chamber and the side wall portion of the piston chamber communicate with each other. Further, an O-ring 16a and a stopper ring 16b that surrounds 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 slide portion 6a. There is.

Further, at least one small hole 10a communicating with the inlet water channel 1 and the outlet water channel 2 is opened in the shoji wall 4c which is provided with a valve seat 4a and separates the inlet water channel and the outlet water channel, and the outlet of the shoji wall 4c is discharged. A check valve body 61, a check housing body 62, a check spring 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 outlet channel 2 side.
Check valve 60 consisting of 63 is assembled.

The pressure adjusting unit 30 communicates with the piston chamber 6 through the water passages 24c and 24d, and is a diaphragm fixedly attached to the center of the valve 17.
The spring 19 is set between the adjustment nut 20 and the adjustment nut 20, and is housed in the housing 22. And housing 22
The adjustment screw 21 having one end exposed to the outside is turned, and the force of the spring 19 is adjusted by moving the adjustment 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 fluid pressure from the viston 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 so that the pressure is adjusted by the spring 19. On the other hand, it is piped so as to pass through the water discharge passage 18a and be discharged from the fluid discharge port 18 or returned to the suction side water passage of the pump.

FIG. 3 systematically shows an example of a water supply device using a 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, and 46 is a connecting pipe of a pressure tank 49. Further, 47 is a pressure switch for turning the pump 42 on and off, 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 the pressure 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 the pressure inside the pipe is reduced to 0.
^{2 to} 0.5 kg f / cm ² Low When the pressure switch 47 falls to the set value, the pressure switch 47 activates the pump 42.
Immediately after the pump 42 starts up, the water sent from the inlet channel through the inlets 24 and 24a to the piston end chamber 6c passes through the small hole 14a of the balancing piston 14 and the back pressure is applied to the rear surface of the piston 14. Occurs, and this becomes higher than the pressure on the side of the discharge water channel 2, so 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 the water passages 24c and 24d.
Passing through the diaphragm 26 and reaching the force of the spring 19 or more, the valve 17 is pushed open, and the water is returned to the pump suction side through the pipe 43 from the fluid discharge port 18 and is adjusted to be substantially constant in the piston chamber 6. Creates pressure.

At this time, as the opening degree of the throttle valve upper valve body 12 and the valve seat 4a increases, the pressure received on the throttle valve side of the valve body 12 apparently decreases from the pressure when the valve body is closed, The flowing water pushes up the valve body 12 by pushing it up to open the valve body, and the lifting force and the force due to the pressure difference between the throttle valve side of the valve body 12 and the discharge channel side are combined with the balancing piston. Due to the force relationship due to the pressure difference between the end surface side and the back surface side of 14, the valve member 5 balances at a certain position in the discharge water channel, and the throttle valve 10
And the opening of the valve seat 4a is 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 port water channel rises and the throttle valve 10 is closed. On the other hand, the water on the inlet side passes through the small hole 10a in the shoji wall 4c and the check valve 6
The check valve body 61 of 0 is pushed up to flow to the discharge port water channel 2 side and is fed into the pressure tank 49. After that, when the pressure of the water supply piping system 45 reaches the pump stop pressure, the pump 42 is stopped by the pressure switch 47, the check valve 60 of the water pressure control valve is closed,
Return to the original state.

[Effect] Since the water pressure control valve of the present invention is provided with a balance mechanism such as a valve member on the discharge water channel side, it is possible to set the size of the balancing piston and the valve body regardless of the structure of the housing or the valve seat. . Therefore, the pressure loss of the valve itself is small, and the responsiveness can be maintained substantially constant up to the terminal pressure on the discharge water channel side without being affected by the flow rate change.

Moreover, since the excess water generated in the pressure adjusting unit is returned to the pump suction side, it is easy to control the pressure in the discharge port water channel constant.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a water pressure control valve according to the present invention, and FIG.
1 is a sectional view taken along the line AA 'in FIG. 1, and FIG. 3 is a schematic system diagram of a water supply device using a water pressure control valve according to the present invention. 1 ... Inlet channel, 2 ... Discharge channel, 4 ... Water pressure control valve 4a ... Valve seat, 4c ... Shoji wall, 5 ... Valve member 6 ... Piston chamber, 6c ... Balanced piston end Part chamber 10 …… Throttle valve, 12 …… Valve body, 13 …… Central shaft 14 …… Balanced piston, 17 …… Valve, 30 …… Pressure adjusting part 42 …… Pump, 43 …… Piping, 49 …… Pressure tank , 60 ……
Check valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication No. Sho 50-16532 (JP, B1) Actual Publication No. 27-7174 (JP, Y1) Actual Publication No. Sho 45-32717 (JP, Y1) Japanese Publication No. 57- 35483 (JP, B2) Actual public Sho 53-33850 (JP, Y2)

Claims (2)

[Claims] 1. A throttle valve section for forming an inside of a housing having an inlet water channel and an outlet channel in a chamber on the inlet channel side and a chamber on the outlet channel side via a valve seat section for opening and closing the valve seat section, It has a balancing piston part provided via a central shaft so as to operate integrally with the throttle valve part, and cylinder chambers are provided on both sides of the balancing piston part, and the cylinder chambers on both sides communicate with each other through a small hole. In the water pressure control valve provided with the balance mechanism, the balance mechanism is provided in the discharge port water channel side chamber, and in the cylinder chambers on both sides of the cylinder chambers located on the side closer to the valve seat portion, A pressure adjusting device for adjusting and maintaining the indoor pressure to a desired pressure is provided, and the other cylinder chamber is provided with an introducing passage communicating with the inflow inlet water passage so as to introduce the fluid pressure on the inflow inlet side. Water pressure Control valve. 2. The water pressure control valve according to claim 1, wherein the excess fluid after being adjusted by the pressure adjusting device is discharged or returned to the suction side water passage of the pump. Water pressure control valve.