JPH0573956B2 - - Google Patents

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. This is to make it easier.

[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 which 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 opens, 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 through this pilot pipe.
Therefore, 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 the one that communicates with the inflow side chamber via the introduction passage, the pressure chamber is communicated with the pressure release passage,
This pressure release passage is formed from the lid body to the valve body, and a connection port is formed in the valve body, and a pilot pipe or the like is connected to the 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, an example of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to a valve for a water tank for waterworks. 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 the on-off valve device 2, and a water supply pipe 6 is further connected thereto, and the water supply pipe 6 communicates with 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. Further, a pilot pipe 7 is connected to this on-off valve device 2, and 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 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, numeral 21 in the figure is a valve box main body, and a lid body 26 is provided on the upper part of this valve box main body 21.
is installed. Inside this valve box body 21,
An inlet side chamber 23 and an outlet side chamber 25 are formed, and an inlet 22 and an outlet 24 are formed in these, respectively. The water pipe 5 is connected to the inlet 22, and the water pipe 6 is connected to the outlet 24 via a silencer 50, which will be described later. Further, a valve port 27 is formed in the valve box main body 1, and the inflow side chamber 23 and the outflow side chamber 25 are communicated through the valve port 27. A valve body 3 is inserted into this valve port 27 from the outflow side.
1 is seated, and this valve port 27 is opened by this valve body 31.
is configured to open and close. Further, a pressure receiving piston 33 is connected to this valve body 31 via a valve shaft 32.
are connected. The piston 33 is slidably housed 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 via this pressure introduction passage 37. In addition, in the middle of this pressure introduction passage 37, there is a throttle/check valve mechanism 38 that controls the flow of water and prevents the flow in the opposite direction.
is provided. Therefore, the pressure in the inflow side chamber 23 is introduced into the pressure chamber 35 via the pressure introduction passage 37.

Also, a buffer chamber 36 below the piston 33
communicates with the above-mentioned outflow side chamber 25 via the throttle/check valve mechanism 36. These check valve mechanisms 3
9 is configured to freely allow flow in the direction from the outflow side chamber 25 to 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 in a limited manner, and the descending velocity of the piston is limited.
Further, a stopper rod 43 is provided on the upper surface of the lid body 26.
is screwed onto the piston 33, and the upward stroke of the piston 33 can be adjusted by rotating the stopper rod and moving it up and down.

Furthermore, pressure release passages 40 and 41 communicating with the pressure chamber 35 are formed. This passage is composed of a passage 40 formed in the lid 26 and a passage 41 formed in the valve box body 21, and extends from the lid 26 to the valve body 21. It is being formed. 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 of the body 26 with the valve body main body 21 is connected. Note that a sealing member is interposed between the abutting surfaces of the lid body 26 and the valve box body 21,
Needless to say, it maintains liquid tightness. A connection port 42 is formed in the valve box body 21, and the connection port 42 communicates with the passage 41.
The valve box main body 21 is opened on the side surface thereof. The pilot tube 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. When water flows through the main body 51 of the silencer 50, the negative pressure generated between the mesh plates 54 and 55 causes water to flow from the vacuum breaker 53 through the branch pipe 52 into the main body 51. Air is drawn inside, and this air becomes microscopic bubbles and disperses into the water stream. The air bubbles attenuate the sound of water flow and are configured to muffle the sound of 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 through 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 and water is supplied into the water tank 1. to do. Further, when the water level in the 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 accumulated, and this pressure pushes down the piston 33, causing the valve body 31 to descend. The valve port 27 is closed and water supply is stopped.

In this valve device, a connection port 42 is formed in the valve box body 21, and each pilot pipe 7 is connected to the connection port 42. Therefore, when the lid body 26 is removed for maintenance or repair of this valve device, this There is no need to remove the pilot tube 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 remove 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 body 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 box 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. The effects are great, such as making these tasks easier and more efficient.

[Brief explanation of drawings]

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] 1. A valve body, a lid attached to the valve body, an inlet chamber and an outlet chamber formed in the valve body, a valve port that communicates the inlet and outlet chambers, and the valve body. a valve body that is seated in the opening and opens and closes the valve port; and a pressure receiving piston that is connected to the valve body and is slidably accommodated in the lid body while maintaining liquid tightness, and that forms a pressure chamber within the lid body. , comprising a pressure introduction passage that communicates the inflow side chamber and the pressure chamber, and a pressure release passage that communicates with the pressure chamber, and a pilot valve is connected to the pressure release passage to open and close the pilot valve. Therefore, in a device that opens and closes the valve body by controlling the pressure inside the pressure chamber, the pressure release passage is formed from the lid body to the valve body body, and the pressure release passage is formed from the lid body to the valve body body. An on-off valve device characterized in that a connection port is formed for connecting a discharge passage to the pilot valve.