JP2003228425A - Transverse pressure reducing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure reducing valve, adequate for a shallow layer provided with a water transport pipe, such as water and sewerage supply, industrial water supply, agricultural water supply, hydroelectric power water. <P>SOLUTION: The valve comprises a partition wall with valve holes in an interior of a valve box having an inflow room and an outflow room, a cylinder in the outflow room, a piston with a valve body for opening and closing the valve holes provided as movement free in the axial direction, small holes for supplying water into the cylinder from the outflow room at the central part of the valve body and allows control of the flow rate of water into the cylinder with a tapered needle with a slim tip end inserted into the small hole. The cylinder is installed in transverse direction to move in a lateral direction and a guide bar equipped, with one end of the piston being supported freely movable by slide axis bearings provided with a cover of the valve box, and a support axis of the needle of which base is fixed to the valve box is supported freely movable, by slide axis bearings equipped with the opposite end of the piston bar. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve provided in a pipe for transporting water such as water and sewerage, industrial water, agricultural water, and hydroelectric power.

[0002]

2. Description of the Related Art As a pressure reducing valve that has been conventionally used for this type of application, there is one as shown in FIGS. The pressure reducing valve 100 includes a valve box 102, a lid 102a, a valve body V and a cylinder S, and a needle 125 that can be adjusted from the outside. The tip of the needle has a thin taper shape and is inserted into a small hole in the center of the valve body having an automatic centripetal function to gradually increase or decrease the amount of pressure water flowing into the cylinder.

A part of the fluid (water) flowing into the valve body flows into the cylinder through a small hole in the central portion of the valve body. This pressure water flows out from the pipe attached to the upper lid. By controlling the amount of this flow, the pressure in the cylinder is changed to move the valve element up and down to open and close the main valve. It has become.

When the outflow of pressure water from the upper part is stopped from this state, the pressure in the cylinder becomes equal to the pressure on the primary side. Comparing the upward force that the valve body receives, that is, the force that opens the valve, with the downward force that the valve body receives, that is, the force that closes the valve, the area above the valve body is larger, so Since the force acts and the weight of the valve element is further applied, the downward force as a whole prevails and the valve element moves in the closing direction. 4 and 5 (a) show this fully closed state.

On the other hand, when the pressurized water in the cylinder is discharged, the internal pressure of the cylinder is lowered, and the upward force acting on the valve body is overcome, and the valve body moves in the opening direction. Figure 5 (b)
Shows the state of the opening start, and FIG. 5C shows the fully opened state.

By controlling the outflow of the pressure water in this way, the valve body opens and closes. Therefore, by appropriately controlling the outflow rate with a pilot valve, a pilot device or the like,
It is possible to control the opening degree that is adapted to the control amount. Therefore, by incorporating a pilot device or the like corresponding to the desired conditions, this pressure reducing valve,
It may have a function of a pressure adjusting valve, a differential pressure adjusting valve, a pressure reducing valve, a safety valve, an emergency shutoff valve, or the like. If a solenoid valve is provided on the outflow side of the pressure water, remote control is possible.

[0007]

The conventional pressure reducing valve described above is
Since the piston equipped with the valve element moves up and down to open and close, the height of the valve itself will inevitably increase.For example, when burying in the ground, the burial depth must be deep. There wasn't. Recent water pipes are required to be buried in a shallow layer, but there is a problem that the conventional high pressure reducing valve cannot meet this demand.

The conventional type of this type of pressure reducing valve is a vertical type,
For the following reasons. That is, in this type of pressure reducing valve, the L-shaped and J-shaped packings are attached to the valve body and the valve box in order to generate an actuating force due to the pressure difference. It acts in the vertical direction, and the valve element is biased downward and cannot move on the central axis, so a load is applied to the lower side of the packing, the packing is deformed and the sliding resistance of the packing increases. , The valve body does not move smoothly. Further, a gap is formed on the upper side of the packing, a pressure difference is not well generated, and the pressure reducing performance cannot be exhibited.

Further, in the case of a vertical valve, it is necessary to overcome the dead weight of the valve element and push the valve element upward when the valve is opened, so that there is a problem that the minimum required operating pressure is large. Therefore, the present invention provides a pressure reducing valve that improves the problems of the conventional pressure reducing valve described above, and that has the same function, can reduce the height of the valve, and can ensure a smooth opening / closing operation. Is an issue.

[0010]

In order to solve the above problems, the present invention has the following constitution. That is, in the horizontal pressure reducing valve according to the present invention, a partition wall having a valve hole is provided inside a valve box having an inflow chamber and an outflow chamber, a cylinder is provided in the outflow chamber, and the inside of the cylinder is provided. A piston provided with a valve body for opening and closing the valve hole is provided movably in the axial direction, and a small hole for allowing water to flow from the inflow chamber to the inside of the cylinder is provided at the center of the valve body. A pressure reducing valve, wherein a tapered needle having a thin tip portion is inserted into the hole, the flow rate of water into the cylinder can be adjusted by the needle, and an outflow passage for letting out water inside the cylinder is provided, A cylinder is provided laterally so that the piston moves laterally, a guide rod protruding outward is provided at one end of the piston, and the guide rod can be freely moved by a slide bearing provided on the lid of the valve box. And support
The valve body provided at the other end of the piston is provided with a through hole that communicates with the inside and outside of the valve body, and the base is fixed to the valve box. The feature is that it is movably supported by bearings.

As the guide rod, it is convenient to use an indicator rod of an opening degree display device which is inserted into an opening degree indicator tube having a viewing window to display the opening degree of the valve element. Further, in order to facilitate the inspection and repair of the inside of the valve box, it is preferable that the valve can be oriented vertically as necessary. For this purpose, connecting pipes for connecting to the pipes are provided on the inlet side and the outlet side of the valve box so as to project, and a ring-shaped brim is provided at the end of this connecting pipe. It is preferable that the ring-shaped brim is sandwiched between the flange fitted on the back side and the flange provided at the joint end of the pipe, and the flange is tightened with a bolt for connection. With this arrangement, the bolts tightening the flanges can be loosened as necessary, and the valve box can be rotated with respect to the piping so that the valve box is oriented vertically.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below. 1 shows an embodiment of the present invention. In this pressure reducing valve 1, the inside of a valve box 2 is partitioned by a partition wall 3 into an inflow chamber 4 and an outflow chamber 5, and a valve hole 6 is formed in the partition wall 3. is doing. A cylinder 10 is provided laterally in the outflow chamber 5, and a cylindrical piston 1 forming a valve body is provided in the cylinder 10.
2 is slidably fitted to the left and right. Piston 12
Are watertightly supported in the valve box 2 via one packing 13 and watertightly supported in the cylinder 10 via the other packing 14.

A guide member 20 is fixed to one end of the piston 12 with a bolt to close the end of the piston 12. A fountain hole 22 is provided in the center of the disk 20a of the guide member 20, and a ring-shaped gasket 25 is attached to the outer peripheral surface side of the guide member 20. When the gasket 25 is brought into pressure contact with the valve seat 27 provided around the valve hole 6, the valve hole 6 is closed, and the valve hole 6 is fully closed.

The guide member 20 has a plurality of (four in the illustrated example) legs 20b, ... Protrudingly provided on the outer surface side of the disc 20a, and the tips of the plurality of legs 20b ,. Two
It is integrated with 0c. A through hole is provided at the center of the small disk 20c, and the needle support shaft 28 is slidably inserted through the through hole through the slide bearing 29. The base of the needle support shaft 28 is attached to a support member 30 fixed to the end of the valve box 2 so that the protrusion amount can be adjusted from the outside.

The needle 35 is integrally provided at the tip of the needle support shaft 28 so as to be tapered on the tip side. The needle 35 is inserted into the fountain hole 22 formed in the central portion of the disc 20a of the guide member, and the size of the gap between the fountain hole 22 and the needle 35 changes as the needle 35 moves back and forth. It is like this.

At the other end (right side in FIG. 1) of the piston 12, a thin cylindrical portion 37 communicating with the inside and outside is integrally provided, and the end surface other than the cylindrical portion 37 is closed. Tube 37
A thin plate-shaped member 39 is fixed to the end portion of the guide rod 40, and the base-side end portion of the guide rod 40 is fixed to the plate-shaped member 39. The guide rod 40 is a tubular body having a through hole in the axial direction, and is slidably fitted to a slide bearing 43 fitted in a through hole formed in the lid 2a of the valve box 2. On the outer surface side of the lid 2a is provided an opening degree display device 45 formed of a cylindrical body with a viewing window, and the tip end portion of the guide rod 40 is inserted into the opening degree display device 45. The position of the piston 12 forming the valve body, that is, the opening of the valve can be known from the end position of the guide rod 40.

An outflow pipe 47 is connected to the cylinder of the opening degree display device 45, and the outflow pipe 47 is connected to the pilot valve 50. The pilot valve 50 is connected to the outflow side (secondary side) of the pressure reducing valve 1 by an outflow path (pipe) 52. When the pilot valve 50 opens, the piston 1 passes through the opening degree display device 45, the outflow pipe 47, and the outflow passage 52.
The inside of 2 communicates with the secondary side.

Short pipes 53 for connection are provided in front of and behind the valve box 2, and ring-shaped collars 54 are integrally provided at the ends of these pipes. A packing 54 a is attached to the surface of the collar 54. Flange 55 is fitted on the back side of the collar 54. The flange 55 has a split structure in which two semicircular members are butted against each other to form a ring shape. Since the two semicircular members are connected and integrated with the connecting plate 56 by a bolt, the flange 55 having a large diameter is used. Can be attached to the outer peripheral portion of the tube 53 formed integrally.

When connecting the pipe P to the pressure reducing valve 1,
The flange 54 provided at the joint end of the pipe P and the flange 55 sandwich the flange 54 of the pressure reducing valve 1 and tighten the bolts 57 and nuts 58 inserted through both flanges to fix them. As a result, the pipe 53 is pinched and fixed with its flange 54 abutting against the flange F of the pipe P.

When the pressure reducing valve 1 is used, water flowing from the primary side (upstream side) into the inflow chamber 4 flows into the piston 12 through the gap between the fountain hole 22 provided in the piston 12 and the needle 35. To do. When the pilot valve 50 is closed, the water that has flowed into the piston 12 does not flow out, and the pressure-receiving area on the inner surface side of the piston 12 is larger than the pressure-receiving area on the outer surface side. That is, the gasket 25 moves to the left in the drawing, and its gasket 25 is brought into a fully closed state in which it is pressed against the valve seat 27 provided around the valve hole 6.

On the other hand, when the pilot valve 50 is opened, the water in the piston 12 is secondary through the inside of the guide rod 40, which is a cylinder, the cylinder of the opening degree display device 45, the outflow pipe 47, and the outflow passage 52. Since it flows out to the side, the pressure in the piston 12 drops, and the piston 12 is pushed and moves in the opening direction, that is, the right direction in the drawing. Therefore, the main valve opens and water flows from the primary side to the secondary side. In this way, the flow of water can be freely controlled by the pilot valve.

In this pressure reducing valve 1, the piston 12 moves not in the vertical direction but in the horizontal direction, so that the vertical dimension can be made smaller than that of the conventional vertical type. For this reason,
It can be installed in a shallow water pipe. Further, since the piston 12 forming the valve body moves laterally, it is not necessary to overcome its own weight to push up the valve body, and the minimum required operating pressure is small.

On the other hand, when the pressure reducing valve 1 is to be inspected or repaired, the bolts and nuts 57 for fastening the flange F and the flange 55, which clamp and fix the flange 54 of the pipe P,
By loosening 58, the valve box 2 can be erected as shown by the arrow Z in FIG. In this way, the lid 2a of the valve box 2 is located on the upper side, and by removing the lid 2a, it is possible to easily inspect and repair the inside of the valve box 2.

[0024]

As is apparent from the above description, in the lateral pressure reducing valve according to the present invention, since the piston and the cylinder are provided laterally, the vertical dimension thereof can be reduced, and the shallow layer burying is possible. Became possible. Moreover, since the piston moves laterally, the weight of the piston does not affect the opening / closing force of the valve, and the opening / closing pressure can be kept low. It should be noted that, as shown in the illustrated example, if the valve box can be erected vertically without completely disconnecting the connection with the piping, inspection and repair inside the valve box will be easy, which is practically preferable. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a valve closed state according to an embodiment of the present invention.

FIG. 2 is a sectional view (a) showing the valve open state and c- in the figure.
It is a c arrow view (b).

FIG. 3 is a cross-sectional view (a) showing a method of connecting to a pipe and a front view (b) of a flange.

FIG. 4 is a cross-sectional view (a) of a conventional homogenous pressure reducing valve and A- in FIG.
FIG.

FIG. 5 is a cross-sectional view showing the operation of a conventional pressure reducing valve of the same type.

[Explanation of symbols]

1 Pressure reducing valve 2 valve box 3 partition walls 4 Inflow chamber 5 Outflow chamber 10 cylinders 12 pistons 20 Guide member 22 fountain holes 35 needles 40 guide rod 50 pilot valve

Claims (3)

[Claims] 1. A partition wall having a valve hole is provided inside a valve box having an inflow chamber and an outflow chamber, a cylinder is provided in the outflow chamber, and the valve hole is opened and closed inside the cylinder. A piston equipped with a valve body that allows movement in the axial direction,
A small hole through which water flows from the inflow chamber to the inside of the cylinder is provided in the center of the valve body, and a tapered needle having a thin tip is inserted into the small hole, and the needle is inserted into the cylinder. Is a pressure reducing valve which is capable of adjusting the flow rate of water and which has an outflow passage through which water in the cylinder flows out, wherein the cylinder is provided laterally so that the piston moves laterally, and one end of the piston is provided. Is provided with a guide rod projecting outward and the guide rod is movably supported by a slide bearing provided on the lid of the valve box, and the valve body provided at the other end of the piston is A horizontal pressure reducing valve characterized in that a through hole communicating with the inside and outside of the valve body is provided, and a support shaft of a needle whose base is fixed to a valve box is movably supported by a slide bearing fitted in the through hole. 2. The guide rod is inserted into a tubular body with a viewing window provided outside the valve box, and also serves as an indicator rod that indicates the degree of opening / closing of the valve body depending on the position of its tip. Horizontal pressure reducing valve described in. 3. A pipe for connection is projectingly provided on both sides of the valve box, and a ring-shaped brim is integrally provided at a tip end of the pipe and provided at an end of a water pipe. With the flange and the ring-shaped flange facing each other, the ring-shaped flange is sandwiched between the flange fitted on the back side of the flange and the flange of the pipe, and both flanges sandwiching the flange are tightened with bolts. The horizontal pressure reducing valve according to claim 1, wherein the valve is connected to the valve box.