JPH0433503Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an on-off valve device used in water supply equipment, etc. More specifically, the present invention relates to a servo-type on-off valve device that can be opened and closed by opening and closing a small pilot valve.

[Prior Art] Servo-type on-off valve devices have been used in water supply facilities and the like. This device includes a pressure receiving piston connected to a valve body, and this piston is slidably housed within a pressure chamber. This pressure chamber is communicated with the inlet side, and the high pressure on the inlet side is introduced into the pressure chamber. Further, a pressure release passage is communicated with this pressure chamber, and this pressure release passage is connected to a pilot valve, which is a small on-off valve, via a pilot pipe or the like. This pilot valve is, for example, a float-type valve installed in a water tank. When the water level in the tank reaches a predetermined level, the float is pushed up and the pilot valve is closed.
The pressure release passage is closed and pressure is accumulated in the pressure chamber, and this pressure acts on the piston to push the piston down and close the valve body. Further, when the water level in the water tank decreases, the pilot valve opens to release the pressure in the pressure chamber through the pressure release passage, and the pressure in the pressure chamber decreases. Therefore, the valve body opens due to the water pressure acting on the valve body or the back surface of the piston, and water is supplied into the water tank. In this way, the water level in this tank is maintained within a predetermined range.

However, with this type of device, the water level in the tank can only be controlled within the operating stroke of the float, and in large tanks, this on-off valve device will be opened and closed frequently, and the water level in the tank will need to be opened and closed frequently. exchange becomes poor, and the amount of so-called dead water increases. Also,
In the unlikely event that the above-mentioned pilot valve malfunctions, the water supply will not be stopped, causing problems such as a large amount of water overflowing unnecessarily.

For this reason, a small electromagnetic valve mechanism is provided in the pressure release passage of the above-mentioned on-off valve device, the water level in the water tank is detected by a water level detector, and the above-mentioned electromagnetic valve mechanism is opened and closed in response to this water level. Open and close this on-off valve device,
The idea is to control the water level in the aquarium.
However, such an on-off valve device is required to have reliable operation and easy maintenance.

[Problems to be solved by the invention] The invention was developed based on the above circumstances, and includes a solenoid valve mechanism in the middle of the pressure release passage, which can be opened and closed by both a pilot valve and an electric signal. The present invention provides an on-off valve device that is easy to maintain.

[Means for Solving the Problems and Their Effects] The present invention provides a valve body, a pressure receiving piston connected to the valve body, a pressure chamber in which the piston is slidably accommodated, and a fluid flow between the pressure chamber and the pressure receiving piston. It has a pressure introduction passage that communicates with the inlet side and a pressure release passage that communicates with this pressure chamber, and an electromagnetic on-off valve mechanism is installed in the middle of this pressure release passage, and a manual It is equipped with an on-off valve mechanism.
Therefore, by connecting a pilot valve to this pressure release passage, it can be used as a servo type on-off valve similar to the conventional one, and the pilot valve can be operated by opening and closing the electromagnetic on-off valve mechanism using an electric signal. Separately, the opening and closing of this on-off valve device can be controlled. In addition, during inspections, repairs, etc., or when the electromagnetic on-off valve mechanism breaks down, this valve device can be opened and closed manually or by a pilot valve by opening and closing the manual on-off valve mechanism described above, which increases reliability. It is expensive and also makes maintenance work easier.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In this embodiment, the present invention is used as an on-off valve for water supply to a water tank. 1 in Fig. 1 is a water tank. Reference numeral 2 denotes an on-off valve device of the present invention, to which a water pipe 5 is connected to an inlet 22, and a water supply pipe 6 is connected to an outlet 24. The structure is such that water is supplied to the Further, a pilot pipe 7 is connected to a connection port 42 of this valve device. This pilot tube 7 is connected to the water tank 1 mentioned above.
A small pilot valve 3 is connected to the tip of the valve. The pilot valve 3 is, for example, a float-type on-off valve, and is configured to be opened and closed by moving the float 4 up and down. Further, a water level detector 8 is attached to this water tank 1 and is configured to detect the water level within this water tank 1. A signal from this water level detector 8 is sent to a control device 9, a signal from this control device is sent to this on-off valve device 2, and in addition to the pilot valve 3 mentioned above, this control device also controls this valve. The on-off valve device 2 is configured to be opened and closed. For example, the maximum water level H3 is controlled by the pilot valve 3, and the water level detector 8 is controlled by the water level detector 8.
and a control device 9 so that the water level is controlled within the range of H1 and H2.

The on-off valve device 2 described above is constructed as shown in FIG. That is, 21 in the figure is a valve box main body, and a lid body 26 is attached on top of this main body. The valve box main body 21 includes an inlet 22 and an inlet side chamber 23 communicating with the inlet.
and an outlet 24 are formed. A valve port 27 that communicates the inflow port 22 and the outflow port 24 is provided.
is formed. A valve body 31 is seated on the valve port 27, and the valve body is configured to open and close the valve port. Further, a pressure receiving piston 33 is connected to the valve body 31 via a valve shaft 32. The piston 33 is slidably accommodated in the pressure chamber 35 in a fluid-tight manner. This pressure chamber 35 is connected to a pressure introduction passage 37.
The pressure chamber 35 communicates with the inflow side chamber 23 through the inflow side chamber 23, and the pressure inside the inflow side chamber 23 is introduced into the pressure chamber 35.

Further, a buffer chamber 36 is formed on the lower surface side of the piston 33, and this buffer chamber 36 communicates with the inflow side chamber 23 via a throttle/check valve 39. This throttle/check valve allows the flow from the inflow side chamber 23 toward the buffer chamber 36 and restricts the flow in the opposite direction.When the piston 33 descends, the buffer chamber The water in the piston 36 is forced out while being limited, and the downward speed of the piston 33 is limited, thereby preventing the valve body 31 from being seated suddenly. A stopper rod 43 is screwed onto the lid 26, and the stroke of the piston 33 can be adjusted by threading the stopper rod up and down.

In addition, pressure release passages 40 and 41 are formed in this valve device and communicate with the pressure chamber 35, and these passages communicate with a connection 42, to which the pilot pipe 7 and the like are connected. It is configured. This pressure release passage is from the lid body 26 to the valve body body 2.
1, and the above-mentioned connection port 42 is formed in the valve body body 2. Therefore, even when the lid 26 is removed for maintenance, repair, etc., the pilot tube does not need to be removed.

Further, an electromagnetic on-off valve mechanism 50 is formed in the middle of this pressure release passage. That is, 51 is the passage, 56 is the valve port, and the valve port 56 is opened and closed by a plunger 57 which also serves as a valve body. This plunger 57 is biased in the valve closing direction by a spring.
When the solenoid 58 is energized, the guide tube 5
4, the valve is opened by moving against the biasing force of the spring, and when the solenoid 58 is demagnetized, the valve is closed by the biasing force of the spring. Further, a manual on-off valve mechanism 59 is formed in parallel with this electromagnetic on-off valve mechanism 50 in the middle of this pressure release passage. Reference numeral 52 denotes a valve port, which communicates the pressure chamber 35 and the passage 40. This valve port 52 is configured so that it can be manually opened and closed by threading a needle valve 53.

The operation of such an on-off valve mechanism will be explained below. In a normal operating state, the manual opening/closing valve mechanism 59 is in a closed state. Further, the water level in the aquarium 1 is normally controlled within the range of H1 to H2. Therefore, the float-type pilot valve is in an open state, and the water level in this water tank 1 is
When the water level falls to H1, this is detected by the water level detector 8, and the solenoid 58 of the electromagnetic on-off valve mechanism 50 is energized by the control device 9 to open the electromagnetic on-off valve mechanism. Therefore, the pressure within the pressure chamber 35 is released via the pressure release passages 40, 41, the pilot pipe 7 and the pilot valve 3, and the pressure within the pressure chamber 35 is reduced. Therefore, the piston 33 rises due to the pressure acting on its back surface, the valve body 31 opens, and water is supplied into the water tank 1.

When the water level rises to H2, the solenoid 58 is demagnetized by the control device 9.
This electromagnetic on-off valve mechanism 50 closes. Therefore, pressure is introduced into the pressure chamber 35 via the pressure introduction passage 37 and accumulated, and the pressure acting on the upper surface of the piston 33 and the upper surface of the valve body 31 causes the valve body 31 to descend and close. The water supply to the water tank 1 is stopped.

In this way, the water level in the aquarium 1 is maintained within a predetermined range. In the unlikely event that the water level detector 3, the control device 9, or the electromagnetic on-off valve mechanism 50 fails and the electromagnetic on-off valve mechanism 50 no longer closes, when the water level rises to H3, the float 4 rises, the pilot valve 3 closes, and the on-off valve device 2 closes as described above to stop water supply. Therefore, even in the unlikely event of an emergency, water is prevented from overflowing unnecessarily.

Furthermore, if the electromagnetic on-off valve mechanism 50 no longer opens, water can be supplied into the water tank 1 by manually opening the manual on-off valve mechanism 59. A pilot valve 3 controls the water level. In addition, this on-off valve device 2
When carrying out maintenance and inspection, etc., the on-off valve device 2 can be opened and closed by manually opening and closing the manual on-off valve mechanism 59. In particular, if it is unclear whether the on-off valve device 2 itself or the electrical system such as the water level detector 8, control device 9, or electromagnetic on-off valve mechanism 50 has failed, the manual on-off valve mechanism 59 Yotsutoko on-off valve device 2
By checking whether it opens and closes normally,
You can easily determine which part has failed, making work easier.

Note that the present invention is not limited to the above embodiments. For example, the detailed structure of the on-off valve device is not necessarily limited to that of the above embodiment.

[Effects of the invention] As described above, the present invention provides an electromagnetic on-off valve mechanism and a manual on-off valve mechanism in the middle of the pressure release passage, so in addition to control by the pilot valve, the on-off valve device can be opened and closed electrically. In addition, in the event of a breakdown in the electrical system, control can be easily switched to a pilot valve by opening this manual on-off valve mechanism, and this manual on-off valve mechanism can also be used for maintenance and inspection. The on-off valve device can be opened and closed manually, making work easier and other benefits.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a schematic diagram of the entire installed state, and FIG. 2 being a longitudinal sectional view of the on-off valve device. 1...Water tank, 2...Opening/closing valve device, 3...Pilot valve, 8...Water level detector, 21...Valve box body,
31...Valve body, 33...Pressure receiving piston, 35...
Pressure chamber, 37... Pressure introduction passage, 40, 41...
Pressure release passage, 50... Electromagnetic opening/closing valve mechanism, 59...
...Manual opening/closing valve mechanism.

Claims (1)

[Scope of utility model registration request] An inlet and an outlet formed in the valve box, a valve port that communicates the inlet and the outlet, a valve body that sits on the valve port to open and close the valve port, and a valve body that is connected to the valve body. a pressure receiving piston, a pressure chamber in which the pressure receiving piston is slidably accommodated in a fluid-tight manner, a pressure introduction passage communicating with the pressure chamber and the above-mentioned inlet side, and a pressure introduction passage communicating with the above-mentioned pressure chamber. and a pressure release passage communicating with a connection port connected to the pilot valve, an electromagnetic on-off valve mechanism provided in the middle of this pressure release passage to open and close this pressure release passage, and a solenoid on-off valve mechanism provided in parallel with this electromagnetic on-off on-off valve mechanism. An on-off valve device comprising a manual on-off valve mechanism that can be directly opened and closed manually to open and close the pressure release passage.