JP2803969B2 - Variable constant flow valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable constant flow valve provided in water and sewage systems, agricultural water systems and the like.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional valve of this type. This is because a valve seat 5 having a communication port 4 is fixed to a partition wall 3 provided in the middle of a flow path 2 in a valve box 1, and is inserted into the valve box 1 through an upper lid 1 a of the valve box 1. A male screw portion 6a of the valve stem 6 is screwed into a female thread portion 5a of the valve seat 5, a fixed valve body 7 is fixed to a lower end portion of the valve stem 6, and a handle fixed to an upper end portion of the valve stem 6. 8, the fixed valve body 7 is raised and lowered as shown by the imaginary line,
The opening H of the flow path 2 is adjusted.

A hydraulic chamber 9 communicating with the upstream side 2a of the flow path 2 via a pipe 12 is provided at an upper portion of the valve box 1, and a diaphragm 1 for isolating the hydraulic chamber 9 from the flow path 2 is provided.
0, a movable valve element 11 is fixedly attached thereto, and a pressure adjusting spring 13 for pressing the diaphragm 10 against water pressure applied to the hydraulic pressure chamber 9 is provided between the diaphragm 10 and the valve seat 5. When the water pressure on the upstream side 2a changes, the diaphragm 10 is vertically displaced by the change in the water pressure as shown by the imaginary line, and the opening h of the flow path 2 is automatically adjusted by the movable valve body 11 to flow through the flow path 2. The flow rate of the flowing fluid is kept constant.

[0004]

In the above-mentioned conventional configuration,
Since the pressure adjusting spring 13 is provided in the flow path 2, the pressure adjusting spring 13 bites a foreign substance or the like, and the movable valve body 1
1 may not be able to adjust the degree of opening of the flow path 2,
When checking and replacing the diaphragm 10 and the pressure adjusting spring 13, the upper part of the valve box 1 must be disassembled.
There is a drawback that it takes time and effort.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a variable constant flow valve which can inspect and replace a diaphragm, a pressure adjusting spring, and the like quickly and easily without a risk of the foreign matter being caught by the pressure adjusting spring. It is intended to be.

[0006]

In order to achieve the above object, the present invention provides a hydraulic pressure chamber separated by a diaphragm at a lower part of a branch path branched downward from a flow path in a valve box. The chamber is communicated with the upstream side of the flow path, and the lower opening of the hydraulic chamber is closed by the bottom cover of the valve box, and a fixed valve body for opening and closing the flow path at the upper part of the branch path and a cylindrical shape. The movable valve body is disposed so as to be movably fitted to each other, the fixed valve body is attached to a valve stem that moves up and down by rotating a handle provided at an upper end portion of the valve box, and the movable valve body is provided with the diaphragm. And a pressure adjusting spring that presses the diaphragm against water pressure applied to the hydraulic chamber is provided in a closed space surrounded by the diaphragm, the fixed valve body and the movable valve body.

[0007]

In the above construction, the maximum flow rate of the flowing water flowing through the flow passage can be determined by rotating the handle to raise and lower the fixed valve body to adjust the opening of the flow passage. In this state, when the water pressure on the upstream side of the flow path changes, the diaphragm is vertically displaced by the change in the water pressure, and the opening of the flow path is automatically adjusted by the movable valve body.
The flow rate of the flowing water flowing through the flow path can be kept constant.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a pair of branch passages 17, 18 are formed in a valve box 15, which branch in a vertical direction from a central portion of a flow passage 16, and a valve stem supporting device that supports a valve stem 19 in the upper branch passage 17. 20 is provided, a hydraulic chamber 22 isolated by a diaphragm 21 is provided below the lower branch passage 18, and a fixed valve body 23 and a movable valve body 24 are provided above the lower branch passage 18. .

The valve stem supporting device 20 includes a rotating block 27 rotatably disposed above the upper branch passage 17 via a bearing 26, a screw rod 28 screwed into a female screw portion 27 a of the rotating block 27, The lower end of the screw rod 28 is integrally connected to the upper end of the valve rod 19, and comprises a watertight piston 29 movably in contact with the inner surface of the upper branch passage 17.

The fixed valve body 23 includes a cylindrical shaft portion 23a fixed to the lower end of the valve stem 19, a valve body 23b integrally formed on the upper end of the cylindrical shaft portion 23a, and a cylindrical shaft portion 23b. Guide plate 2 having the same diameter as valve body 23b integrally formed at the lower end of
3c, by rotating the handle 30 fixed to the rotating block 27 to raise and lower the valve stem 19,
Partition wall 31 in valve body 23b of fixed valve element 23 and flow path 16
The degree of opening H between the opening 31a and the valve seat 31b can be adjusted.

The movable valve element 24 is cylindrical, and its inner and outer peripheral surfaces are slidably contacted with the valve main body 23b and the guide plate portion 23c and the inner peripheral surface of the lower branch passage 18, and the diaphragm 21 is
It is stuck to.

The hydraulic chamber 22 communicates with the upstream side 16a of the flow path 16 via a pipe 32, and the lower opening of the hydraulic chamber 22 is closed by a bottom cover 15a of the valve box 15.
By removing the bottom cover 15a, the diaphragm 2
Inspection and replacement of the pressure spring 1 and the pressure adjustment spring 33 can be easily performed.

A pressure adjusting spring 33 for pressing the diaphragm 21 against water pressure applied to the water pressure chamber 22 is provided in a closed space 34 surrounded by the diaphragm 21, the fixed valve body 23 and the movable valve body 24. Therefore, the pressure adjusting spring 33 does not bite foreign matter in the flowing water flowing through the flow path 16. Therefore, the diaphragm 21 can be reliably displaced up and down following the change in the water pressure of the water pressure chamber 22, and the opening h between the movable valve body 24 and the valve seat 31b is automatically adjusted.

Reference numeral 35 denotes an opening meter fixed to the upper end of the threaded rod 28, 36 denotes a rotation preventing member, and 37 denotes a drain pipe connected to the pipe 32. In the above configuration, the handle 30
By rotating the valve, the fixed valve element 23 is moved up and down to adjust the opening degree H of the flow path 16, whereby the maximum flow rate of the flowing water flowing through the flow path 16 can be determined. In this state, when the water pressure on the upstream side of the flow path 16 changes, the change in the water pressure causes the diaphragm 21 to be vertically displaced, and the movable valve body 2
Since the opening degree h of the flow path 16 is automatically adjusted by 4, the flow rate of the flowing water flowing through the flow path 16 can be kept constant.

[0015]

According to the present invention, since the pressure adjusting spring is provided in the closed space surrounded by the diaphragm, the fixed valve body and the movable valve body, the pressure adjusting spring catches foreign matter as in the prior art. There is no danger of intrusion, and the opening can be reliably adjusted by the movable valve body, and the flow rate can be kept constant. Also, since the hydraulic chamber is provided at the bottom of the valve box, and the lower opening of the hydraulic chamber is sealed by the bottom cover of the valve box,
By opening the bottom lid, inspection and replacement of the diaphragm, the pressure adjusting spring, and the like can be performed quickly and easily.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a variable metering valve according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional example.

[Description of Signs] 15 Valve box 16 Flow path 16a Upstream side of flow path 18 Lower branch path 19 Valve rod 21 Diaphragm 22 Water pressure chamber 23 Fixed valve body 24 Movable valve body 30 Handle 33 Pressure adjusting spring 34 Closed space

Claims (1)

(57) [Claims] 1. A hydraulic chamber separated by a diaphragm is provided at a lower part of a branch path branched downward from a flow path in a valve box,
The hydraulic chamber communicates with the upstream side of the flow path, and the lower opening of the hydraulic chamber is closed by the bottom cover of the valve box, and a fixed valve body and a cylinder for opening and closing the flow path above the branch path. The movable valve body is disposed in a state in which the movable valve body is movably fitted to each other, and the fixed valve body is attached to a valve stem that moves up and down by rotating a handle provided at the upper end of the valve box. A pressure adjusting spring attached to the diaphragm and pressing the diaphragm against water pressure applied to the hydraulic chamber is provided in an enclosed space surrounded by the diaphragm, the fixed valve body and the movable valve body. Variable constant flow valve.