JPH0251681A - Switching valve device - Google Patents

Abstract

PURPOSE:To eliminate the need for removing a pilot pipe when a cover-body is removed for maintenance and repair of the switching valve device by connecting a pilot pipe to a connection port on the valve box body instead of connecting it to the cover body of the valve. CONSTITUTION:The switching valve device has a valve box body 21, a cover body 26, and a valve disc 31 opening or closing a valve-orifice in this valve box body 21. A connection port 42 is formed on the valve box body 21, and a pilot pipe 7 is connected to the connection port 42. A pilot valve 3 and the pilot pipe 7 are thus connected to the connection port 42 on the valve box body 21 side, and the need for removing the pilot valve 3 and the pilot pipe 7 is eliminated when the cover-body 26 is removed for maintenance and repair of the valve device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pilot type on-off valve device for water supply, etc., and more specifically, the present invention relates to maintenance and repair of such a type of valve device. It is intended to be used as a container.

[Prior Art] Pilot-type valve devices have conventionally been used as on-off valve devices for waterworks and the like. In such a valve device, a pressure receiving piston is connected to the valve body, this piston is slidably housed in a chamber formed in the lid of the valve box, etc., and the pressure is applied to one side of the piston. A chamber is formed, and this pressure chamber is communicated with an inflow side chamber, and a pressure release passage is formed that communicates with this pressure chamber, and a small pilot valve is connected to this pressure release passage via a pilot pipe etc. It is something. When this pilot valve is opened, the pressure in the above pressure chamber is released, the piston moves and the valve body is opened, and when this pilot valve is closed, the pressure inside the inflow side chamber is released into the above pressure chamber. This pressure causes the piston to move and the valve body to close. In such a device, a large valve device can be opened and closed by opening and closing a small pilot valve.

By the way, in the conventional valve, the above-mentioned pressure release passage and its connection port were formed in the lid of the valve box.

When this valve device is installed, a pilot pipe is connected to this connection port, and a pilot valve is connected via this pilot pipe. For this reason, when the lid body is removed during maintenance or repair of this on-off valve device, it is necessary to disconnect the pilot pipe. For this reason, there were problems such as the work being troublesome and requiring a long time.

[Problems to be Solved by the Invention] The present invention has been made based on the above circumstances, and is intended to facilitate maintenance, repair, and other operations in this type of on-off valve device.

[Means for Solving the Problems and Their Effects] The on-off valve device of the present invention includes a valve box main body and a lid body, and a valve port is formed in the valve box main body, and the valve port is opened and closed. A pressure receiving piston is connected to this valve body, and this piston is slidably housed in the above-mentioned lid body, and a pressure chamber is formed on one side of this piston, and this pressure chamber is connected to a pressure receiving piston. In one that communicates with the inflow side chamber via the introduction passage.

A pressure release passage is communicated with the pressure chamber, and the pressure release passage is formed from the lid body to the valve body body,
A connection port is formed in this valve body body, and a pilot pipe or the like is connected to this connection port.

Therefore, when removing the lid for maintenance or repair of this on-off valve device, there is no need to remove the pilot pipe, and maintenance, repair, etc. can be performed easily and efficiently.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

In this embodiment, the present invention is applied to a valve for a water tank in a water supply system. 1 in the figure is a water tank, and 2 is an on-off valve device of the present invention for supplying water to this water tank. A water pipe 5 is connected to this on-off valve device 2, and a water supply pipe 6
is connected, and this water supply pipe 6 communicates with the inside of the water tank 1 described above. When the on-off valve device 2 opens, water is supplied into the water tank 1 through the water supply pipe 6. Also,
A pilot pipe 7 is connected to this on-off valve device 2, this pilot pipe 7 is drawn into the water tank 1, and its tip is connected to a small pilot valve 3. This pilot valve 3 controls the water level in this water tank 1, and is equipped with a float 4. When the water level reaches a certain level or higher, this float rises and this pilot valve 3 closes, and when the water level reaches a predetermined level. The pilot valve 3 is configured to open when the following conditions occur.

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 to the upper part of this valve box main body 2. An inflow side chamber 23 and an outflow side chamber 25 are formed in the valve body main body 21, and an inflow port 22 and an outflow port 24 are formed in these, respectively. The water pipe 5 is connected to the inlet 22, and the outlet 24 is connected to the water pipe 5.
A water supply pipe 6 is connected to the water supply pipe 6 via a silencer 50 which will be described later. In addition, a valve port 27 is provided in the valve box body 1.
is formed, and the above-mentioned inflow side chamber 23 flows through this valve port 27.
and the outflow side chamber 25 are communicated with each other. A valve body 31 is seated on the valve port 27 from the outflow side, and the valve body 31 is configured to open and close the valve port 27. 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 lid 26 in a fluid-tight manner, and a pressure chamber 35 is formed above the piston 33, and a buffer chamber 36 is formed below the piston 33. ing.

A pressure introduction passage 37 is formed across the valve box main body 21 and the lid body 26, and the income side chamber 23 and the pressure chamber 35 are communicated with each other via this pressure introduction passage 37. In addition, in the middle of this pressure introduction passage 37,
A restrictor and check valve mechanism 38 is provided to control the flow of water and prevent reverse flow. Therefore, the pressure in the inflow side chamber 23 is introduced into the pressure chamber 35 via the pressure introduction passage 37.

In addition, the buffer chamber 36 below the piston 33 has a throttle and
It communicates with the inside of the above-mentioned outflow side chamber 25 via a check valve mechanism 36. These check valve mechanisms 39 are configured to freely allow flow in the direction from the outflow side chamber 25 into the buffer chamber 36, and to restrict the flow rate in the opposite direction.

Therefore, when the piston 33 ascends, its ascending speed is not limited, but when the piston 33 descends, the water in the buffer chamber 36 is pushed out while being limited, and the descending velocity of the piston is limited. Ru.

Further, a stopper rod 43 is screwed onto the upper surface of the lid 26, and the upward stroke of the piston 33 can be adjusted by rotating the stopper rod and moving it up and down.

Also, a pressure release passage 40 communicating with the pressure chamber 35 described above.
41 is formed. This passage is composed of a passage 40 formed in the above-mentioned lid body 26 and a passage 41 formed in the above-mentioned valve box body 21.
It is formed from the valve body to the valve body body 21.

A tube 44 is inserted into the passage 41, and this tube 44 protrudes from the upper surface of the valve box body 21 and is fitted into the passage 40 of the lid 26. A portion of the abutting surface with the valve body body 21 is connected. It goes without saying that a sealing member is interposed between the abutting surfaces of the lid body 26 and the valve body body 21 to maintain liquid tightness. A connection port 42 is formed in the valve box main body 21, and the connection port 42 communicates with the passage 41 and opens on the side surface of the valve box main body 21. The pilot pipe 7 is configured to be connected to this connection port 42.

Further, the water supply pipe 6 is connected to the outlet 24 via the muffling device 50 described above.

This muffling device is for muffling the sound of water flowing.

That is, 51 is the main body, and a pair of mesh plates 54 and 55 are provided inside the main body 51, and these mesh plates are, for example, stainless steel plates with a large number of small holes formed therein. Further, a branch pipe 52 branched from a portion between these mesh plates projects upward, and a vacuum breaker 53 is attached to the upper end of this branch pipe. and,
When water flows through the main body 51 of the silencer 50, air is drawn into the water flow flowing through the main body 51 from the vacuum breaker 53 via the branch pipe 52 due to the negative pressure generated between the mesh plates 54 and 55. This air becomes microscopic bubbles and disperses into the water stream. The air bubbles attenuate the sound of the water flow and are configured to muffle the sound of the water flow generated while the valve device is open.

Then, when the water level in the water tank 1 decreases and the float 4 descends, the pilot valve 3 opens.

When the pilot valve 3 opens, the pressure inside the pressure chamber 35 is released via the pilot pipe 7, and the pressure inside the pressure chamber 35 decreases. Therefore, the piston 33 is pushed up by the pressure in the buffer chamber 36 and the pressure in the inlet side chamber 23 acting on the lower surface of the valve body 31, and the valve body 31 opens to supply water into the water tank 1. Also, when the water level in this water tank 1 rises to a predetermined water level, the float 4
rises, and the pilot valve 3 closes. Therefore, the high pressure in the inflow side chamber 23 is introduced into the pressure chamber 35 through the pressure introduction passage 37 and is accumulated, and this pressure pushes down the piston 33, causing the valve body 31 to descend and open the valve port 23.
7 and the water supply is stopped.

In this valve device, the connection port 42 is formed in the valve box body 21, and the pilot pipes 7 are individually connected.
When removing the lid body 26 during maintenance or repair of this valve device, it is not necessary to remove this pilot pipe 7. Therefore, maintenance and repair work of the valve device becomes easy and efficient.

Note that the present invention is not limited to the above embodiments.

For example, the configuration of each part of this valve device is not necessarily limited to the configuration described above. Further, the pilot valve 3 is not necessarily attached to the connection port via the pilot pipe 7, but the pilot valve may be directly attached to the connection port. Even in this case, there is no need to disassemble the pilot valve when the lid is removed during maintenance or repair of the valve device.

[Effects of the Invention] As described above, in the present invention, a pressure release passage is formed from the lid body to the valve box body, and a connection port is formed in the valve body body. Therefore, the pilot valve and pilot pipe are connected to the connection port on the valve body side, and when the lid body is removed during maintenance or repair of this valve device, there is no need to remove the pilot valve or pilot pipe, and these The effects are great, such as making work easier and more efficient.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of the entire installed state of this valve device, and FIG. 2 is a longitudinal cross-sectional view of this valve device. DESCRIPTION OF SYMBOLS 1... Water tank, 3... Pilot valve, 7... Pilot pipe, 21... Valve box body, 26... Lid body, 31...
...Valve body, 33...Pressure receiving piston, 35...Pressure chamber, 37...Pressure introduction passage, 40.41...Pressure release passage, 42...Connection port

Claims (1)

[Claims] A valve box main body, a lid attached to the valve box main body, an inflow side chamber and an outflow side chamber formed in the valve box main body,
A valve port that communicates between the inflow side chamber and the outflow side chamber, a valve body that is seated on this valve port and opens and closes this valve port, and a valve body that is connected to this valve body and is slidable while maintaining liquid tightness inside the lid body. accommodated,
A pressure receiving piston forming a pressure chamber within the lid body, a pressure introduction passage communicating the inflow side chamber and the pressure chamber, and a pressure release passage communicating with the pressure chamber, the pressure release passage having a pilot valve. In the valve body, the pressure release passage is formed from the lid body to the valve body body by controlling the pressure in the pressure chamber to open and close the pilot valve. ,
An on-off valve device characterized in that a connection port for connecting the pressure release passage to the pilot valve is formed in the valve box body.