JPH087457Y2 - Pilot valve for automatic response type pressure reducing valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention derives the fluid from the chamber of the main valve according to the fluid pressure on the secondary side of the main valve, and changes the pressure of the chamber to change the pressure of the main valve body. The present invention relates to a pilot valve for an automatic response type pressure reducing valve that controls the opening of the.

[Prior Art] Conventionally, an automatic response type pressure reducing valve having a structure shown in FIG. 2 has been used as an automatic response type pressure reducing valve for controlling the fluid pressure on the downstream side of a liquid feeding pipe line of a water supply system for waterworks. This automatic response type pressure reducing valve
The primary side 2 of the main valve 1 and the chamber 3 are connected to the fluid introduction pipe 4
Pilot pipe 7 provided with a pilot valve 6 for connecting the primary side fluid into the chamber 3 and opening / closing the primary side fluid according to the fluid pressure on the secondary side 5 of the main valve 1. Is led to the secondary side 5 of the main valve 1 to change the pressure in the chamber 3, and thereby the opening degree of the main valve body 8 is controlled.

The pilot valve 6 used in the automatic response type pressure reducing valve having such a configuration normally divides the inside of the valve box 61 into a pressure chamber 63 and a spring chamber 64 by a movable partition wall 62 such as a diaphragm orthogonal to the valve box axis. The spring chamber 64 has a movable partition wall.
A spring 65 that presses 62 toward the pressure chamber 63 is housed, and the pressure chamber 63 is communicated with the chamber 3 of the main valve 1 via the primary side pilot pipe 7a of the pilot pipe 7 and the secondary side. Communicate with the secondary side 5 of the main valve 1 through the pilot pipe 7b so that the tip portion 7c of the primary pilot pipe 7a projects from the peripheral wall of the pressure chamber 63 toward the valve box axis into the pressure chamber 63. An opening 7d at the tip of the primary side pilot pipe 7a is opened on the valve box axis toward the anti-movable partition side, and the valve body 66 for opening and closing the opening 7d passes through the valve box axis of the movable partition 62. It is provided at the tip of a valve rod 67, which has a base end fixed to the center and extends into the pressure chamber.

In the pilot valve 6, when the fluid pressure on the secondary side 5 of the main valve 1 rises, the movable partition wall 62 is pushed toward the spring chamber 64 by the pressure, and the valve element 66 moves the primary side pilot pipe 7a.
When the opening 7d of the main valve 1 is closed and the fluid pressure on the secondary side 5 of the main valve 1 is reduced, the movable partition 62 is pushed by the spring 65, and the valve body is closed.
66 is formed apart from the opening 7d of the primary pilot pipe 7a so that the primary pilot pipe 7a and the secondary pilot pipe 7b communicate with each other.

[Problems to be solved by the device]

However, the conventional pilot valve 6 is provided such that the valve rod 67 supporting the valve element 66 penetrates the tip portion 7c of the primary side pilot pipe 7a and projects from the opening 7d due to its operation. Therefore, it is necessary to dispose a sealing member at the penetrating portion of the valve rod 67 to prevent the fluid from leaking from the primary pilot pipe 7a.

Therefore, the sealing member serves as a resistance against the movement of the valve rod 67,
Even if the fluid pressure on the secondary side 5 of the main valve 1 changes, there is a range in which the valve element 66 does not operate. That is, when the change in pressure on the secondary side 5 of the main valve 1 was small, the valve element 66 did not open and close due to the sliding resistance with the sealing member, and therefore the main valve element 8 did not open and close.

Such delay or non-operation of the opening / closing operation of the pilot valve 6 hardly causes a problem when the opening degree of the main valve body 8 is large and the flow rate is large, but at the time of a small flow rate, the main valve body 8
Since there is a slight movement in the opening degree control, there has been a demand for the development of a pilot valve that can sensitively respond to the pressure change on the secondary side 5 of the main valve 1. In addition, hunting that mainly occurs when the main valve body 8 is opened to a small degree causes damage to pipe joints and valves, and also causes inconvenience in the use of fluid at the end. ing.

Therefore, the present invention eliminates the delay or non-operation of the opening / closing operation of the pilot valve when the pressure change on the secondary side of the main valve is slight, and can respond to the pressure change on the secondary side of the main valve with good sensitivity, and also prevents hunting. The purpose is to provide a pilot valve that can be achieved.

[Means for solving the problem]

In order to achieve the above-mentioned object, the pilot valve of the present invention divides the inside of the valve box into a pressure chamber and a spring chamber by a movable partition which is orthogonal to the axis of the valve box, and the movable partition is pressurized in the spring chamber. A spring that presses the room is stored,
The pressure chamber is communicated with the chamber of the main valve through the primary side pilot pipe and is communicated with the secondary side of the main valve through the secondary side pilot pipe, and the tip of the primary side pilot pipe is connected to the pressure side. From the peripheral wall of the chamber toward the valve box axis, projecting into the pressure chamber, the opening of the tip of the primary side pilot pipe is opened on the valve box axis toward the anti-movable partition side, and the valve box axis of the movable partition passes through. In a pilot valve for an automatic response type pressure reducing valve, a valve rod having a base end fixed to a central portion is extended into the pressure chamber, and the opening is opened / closed by a valve body provided at a tip end portion of the valve rod. A first bent portion that extends in the direction opposite to the movable partition wall from the base end toward the anti-movable partition wall and is bent toward the circumferential wall of the pressure chamber at a position that does not reach the tip of the primary pilot pipe; Avoid the tip of the primary side pilot pipe from the bent part And a second bent portion that extends in the direction of the anti-movable partition wall and bends in the direction of the valve box axis at a position beyond the opening and reaches the valve box axis. The valve element provided at the tip of the second bent portion is opposed to the opening.

[Action]

Therefore, by forming the valve rod having the base end fixed to the central portion through which the valve box axis of the movable partition wall passes by forming the first bent portion and the second bent portion, even if the valve rod operates, it projects into the pressure chamber. There is no collision with the tip of the primary pilot pipe, and the movement of the valve stem is not obstructed. Further, since the valve rod is formed by bending a single rod material, it is possible to respond to the pressure change on the secondary side of the main valve with good sensitivity.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. In the following description, the same elements as those of the conventional example shown in FIG. 2 are designated by the same reference numerals and detailed description thereof will be omitted.

In the pilot valve 11 of the present embodiment, the inside of the valve box 61 is partitioned into a pressure chamber 63 and a spring chamber 64 by a movable partition 62 such as a diaphragm orthogonal to the valve box axis CL, as in the conventional pilot valve. , The movable partition 62 in the spring chamber 64
A spring 65 that presses the main chamber toward the pressure chamber 63 side, the pressure chamber 63 is communicated with the chamber of the main valve via the primary side pilot pipe 7a, and the main valve secondary via the secondary side pilot pipe 7b. Side, and the tip portion 7c of the primary side pilot pipe 7a is projected from the peripheral wall 63a of the pressure chamber 63 toward the valve box axis CL into the pressure chamber 63, and the opening 7d at the tip of the primary side pilot pipe 7a is formed. Is opened on the valve box axis CL toward the anti-movable partition wall side, and the valve body 12 for opening and closing the opening 7d has a base end 13a fixed to the central portion of the movable partition wall 62 through which the valve box axis CL passes. And is provided at the tip portion 13b of the valve rod 13 extending into the pressure chamber 63.

Then, the valve rod 13 extends from the base end 13a on the valve box axis CL in the direction opposite to the movable partition wall and faces the peripheral wall 63a of the pressure chamber 63 at a position not reaching the tip portion 7b of the primary side pilot pipe 7a. And the first bent portion 13c that is bent, and the valve at a position that extends from the first bent portion 13c toward the anti-movable partition wall and avoids the tip end portion 7c of the primary pilot pipe 7a, and extends beyond the opening 7d. Box axis CL
Second bent portion 13 that bends in the direction and reaches on the axis CL of the valve box
The valve body 12 is formed of a single rod member consisting of d and the valve body 12 provided at the tip of the second bent portion 13d so as to face the opening 7d.

Therefore, in the valve rod 13 having the base end 13a fixed to the central portion of the movable partition wall 62 through which the valve box axis CL passes, the first bent portion 13c and the second bent portion 13d have a 1 Since the collision with the tip portion 7c of the secondary pilot pipe 7a is avoided, the movement of the valve stem is not hindered.

The valve rod 13 is the tip of the primary pilot pipe 7a.
Since it does not penetrate 7c, sliding resistance does not occur compared to the conventional valve rod that penetrates the sealing member at the tip of the primary side pilot pipe, and the valve rod 13 is formed by bending with one rod material. To operate the valve body 12 with high sensitivity,
The opening 7d of 7a can be opened and closed properly.

As a result, the main valve body can be reliably operated according to the pressure change on the secondary side of the main valve, the pressure and flow rate of the fluid on the secondary side of the main valve can be reliably controlled, and at the same time, in the pipe. Even when a sudden pressure change that is a factor that causes hunting occurs, the main valve element operates properly via the pilot valve 11, so that the pressure change can be immediately converged and hunting can be prevented. be able to.

[Effect of device]

As described above, the pilot valve of the present invention divides the inside of the valve box into the pressure chamber and the spring chamber by the movable partition wall orthogonal to the valve box axis, and the movable partition wall is pressed to the pressure chamber side by the spring chamber. A spring for storing the pressure chamber,
Communicate with the main valve chamber through the primary side pilot pipe and communicate with the main valve secondary side through the secondary side pilot pipe, and connect the tip of the primary side pilot pipe from the peripheral wall of the pressure chamber to the valve box axis. To the pressure chamber,
A valve rod that extends to the pressure chamber by opening the opening of the tip of the primary side pilot pipe toward the anti-movable partition wall side and opening it on the valve box axis, and fixing the base end to the center of the movable partition wall through which the valve box axis passes A first bent portion that extends from the base end in the direction of the anti-movable partition wall on the axis of the valve box and does not reach the tip of the primary pilot pipe, and is bent toward the circumferential wall of the pressure chamber; Second bend that extends in the direction opposite to the movable partition wall, avoiding the tip of the primary side pilot pipe, and bends in the valve box axial direction at a position beyond the opening to reach the valve box axial line. 1 consisting of
Since the valve body formed of two rods and provided at the tip of the second bent portion is opposed to the opening, the valve rod having the base end fixed to the center of the movable partition wall through which the valve box axis passes is , The valve stem protrudes into the pressure chamber due to the first bent portion and the second bent portion 1
Since it does not penetrate the tip of the secondary pilot pipe, it does not generate sliding resistance compared to the conventional valve rod that penetrates the sealing member at the tip of the primary pilot pipe. Since the rod is bent and formed, the valve body can be smoothly opened and closed according to the change in pressure on the secondary side of the main valve, and the main valve body can be precisely opened and closed.

Therefore, the pressure and flow rate of the fluid on the secondary side of the main valve can be accurately controlled, and hunting can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a pilot valve showing an embodiment of the present invention, and FIG. 2 is a system diagram showing an example of an automatic response type pressure reducing valve using a conventional pilot valve. 7a …… Primary side pilot piping, 7b …… Secondary side pilot piping, 7c …… Primary side pilot piping tip, 7d …… Opening, 11 …… Pilot valve, 12 …… Valve element, 13 …… Valve stem, 13
a ... proximal end of valve stem, 13b ... distal end of valve stem, 13c ... first bent part of valve rod, 13d ... second bent part of valve rod, 61 ... valve box, 62 ... movable Partition wall, 63 ... Pressure chamber, 64 ... Spring chamber, 65 ... Spring

Claims (1)

[Scope of utility model registration request] 1. A valve chamber is divided into a pressure chamber and a spring chamber by a movable partition wall orthogonal to the valve box axis, and a spring for pressing the movable partition wall toward the pressure chamber is housed in the spring chamber. The pressure chamber is communicated with the chamber of the main valve via the primary side pilot pipe and is communicated with the secondary side of the main valve via the secondary side pilot pipe, and the tip of the primary side pilot pipe is connected to the pressure chamber. From the peripheral wall of the valve box toward the axis of the valve box, and the opening of the tip of the primary pilot pipe toward the side of the anti-movable partition on the axis of the valve box,
For an automatic response type pressure reducing valve in which a valve rod having a base end fixed to a central portion through which the valve box axis of the movable partition passes is extended into the pressure chamber, and the opening is opened / closed by a valve body provided at a tip end portion of the valve rod. In the pilot valve of No. 1, the valve rod extends from the base end in the direction of the anti-movable partition on the valve box axis and is bent toward the peripheral wall of the pressure chamber at a position that does not reach the tip of the primary pilot pipe. A first bent portion and a portion extending from the first bent portion in the direction opposite to the movable partition wall, avoiding the tip portion of the primary pilot pipe, and bent in the valve box axial direction at a position before the opening. And a second bent portion extending to the axis of the valve box and formed of one rod, and the valve element provided at the tip of the second bent portion is made to face the opening. Pilot valve for automatic response type pressure reducing valve.