JPH06109155A - Air valve for city water - Google Patents

Abstract

PURPOSE:To provide an air valve for city water at a low cost which can be easily attached to a fire hydrant by constituting the air valve for discharging the air in a concerned pipe line while utilizing the fire hydrant provided in the middle of the pipe line for city water so as to attach to and detach from the outlet of the fire hydrant in a single motion. CONSTITUTION:In securing an air valve A for city water to a fire hydrant B, the air valve A is placed on the outlet 1 of the fire hydrant B and pressed lowered to push each movable claw 14 by the upper end edge of the outlet 1. When the lower section of a bracket 10 is fitted in the large diameter section 1a of the outlet 1, and the lower face of the bracket 10 is adjusted to a locking face 2, the head of each claw 14 is locked with the locking face 2. In this state, a clamping ring 12 is made to threadedly advance to be engaged with the bracket 10, fixing each movable claw 14 to the outlet 1 and bracket 10, allowing the air valve A to be connected to the outlet 1. The air valve A comprises a float 16 approaching and separating from the valve seat 8 in a valve box 5 containing therein and opens and closes a small air hole 8a according to the vertical movement of the float 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a fire hydrant for the purpose of discharging air in a water pipe connected to a water pipe by using a fire hydrant connected in the middle of the water pipe. Related to air valve for water supply.

[0002]

2. Description of the Related Art Conventionally, when discharging air from a water pipe, an air valve connected to the water pipe separately from a fire hydrant,
A fire hydrant with an air valve is used in which a mouthpiece to which a fitting for a fire hose is connected and an air valve having a float and a small air hole valve seat in a valve box are provided side by side.

[0003]

When the air valve is connected to the water pipe, there is a problem that the connection work is complicated, and the fire hydrant with an air valve is expensive and large in size. It is an object of the present invention to provide an inexpensive water valve for water supply that is easy to attach to a fire hydrant.

[0004]

The water valve for a water supply according to the present invention is a water valve for a water supply which is detachably connected to a mouthpiece of a fire hydrant connected in the middle of a water supply line. At the center of the lower surface of the lid that is connected to the upper end of the cylindrical valve box to which the metal fittings are connected, the upper part is loaded into the valve box and the lower part is loaded into the mouthpiece. A small air hole valve seat is attached, and the inside of the tightening ring screwed into the receiving metal fitting is urged inward by a spring so that it can be disengaged from the locking surface formed near the upper end of the base. A plurality of movable claws to be stopped are installed so as to be movable in the radial direction of the fastening ring.

[0005]

[Function] A plurality of movable claws, which are installed in the fastening ring connected to the valve box of the water supply air valve through the metal fittings and are biased inward by the spring, are formed near the upper end of the base of the fire hydrant. The water valve is hooked on the hooking surface and the water valve is connected to the base to add the function of the air valve to the fire hydrant. In the state where the water valve is connected to the mouthpiece, the float whose upper part is inserted into the valve box comes in contact with and separates from the small air hole valve seat attached to the central part of the lower surface of the lid plate that covers the valve box. The air flowing into the valve box from the water pipe is trapped in the valve box or discharged from the valve box to the outside.

[0006]

EFFECTS OF THE INVENTION Since the present invention is constructed as described above, the tap water valve can be easily attached to and detached from the base of the fire hydrant with one touch, and the tap air valve can be made smaller and lighter. It is possible to simplify the handling of the air valve for use and reduce the cost of the discharge mechanism that discharges the air from the water pipe. Also, since the function of the air valve can be added to the fire hydrant simply by mounting the water valve on the fire hydrant, it also functions as an air valve for the existing fire hydrant attached to the water pipe. It can be easily added.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. In a fire hydrant B to which a water valve A for discharging water in the water pipe is mounted, a water air valve A and a fire hose are connected above a valve box (not shown) connected to the water pipe. A stepped cylindrical mouthpiece 1 to which the metal fittings are detachably coupled is installed, a large diameter portion 1a having a slightly enlarged outer diameter is formed near the upper end of the mouthpiece 1, and the lower end surface of the large diameter portion 1a is formed. A hooking surface 2 on which a coupling fitting of a fire hose is hooked is formed in an annular shape, and a small diameter portion 1b is formed in a step shape below the large diameter portion 1a.

On the small diameter portion 1b of the mouthpiece 1, there is fitted a push wheel 3 which is pushed up when the fitting for a fire hose is removed from the mouthpiece 1.

In the water valve A for water supply, the cylindrical valve box 5 installed at the upper portion of the water supply valve A is used when the water valve A for water supply is removed from the digestion tap B while the pressure in the water supply pipe is high. A cock 17 for suddenly discharging air from the inside of the stopper B to reduce the pressure inside the digestive stopper B is attached, and a projecting edge 5a is circumferentially projected on the lower end edge of the inner wall surface of the valve box 5. .

A lid plate 6 for covering the valve box 5 is coupled to the upper end of the valve box 5, and a valve seat mounting portion 6a is provided at the center of the lower surface of the lid plate 6 so as to project therefrom. A threaded portion 6b that is screwed into the upper end of the valve box 5 is provided in an annular shape in the vicinity of the peripheral edge of the lower surface of the, and an exhaust hole 7 having a hole diameter of about 4 mm is vertically provided through the central portion of the lid plate 6. Has been done.

On the valve seat mounting portion 6a of the cover plate 6, there is a conical small air hole valve seat 8 which is pressed against the lower surface of the valve seat mounting portion 6a by a screw thread 9 which is screwed into the valve seat mounting portion 6a. Is attached, and the hole diameter is 1.
A small air hole 8a, which is 8 mm and communicates with the exhaust hole 7 in series, is vertically provided.

A receiving fitting 10 is screwed to the lower end of the valve box 5 so that the lower end surface is aligned with the hooking surface 2 of the base 1.
Are concentrically connected to each other, and the large diameter portion 1a of the mouthpiece 1 is tightly fitted into the lower portion of the receiving metal fitting 10.

A ring-shaped seal groove 10a, in which a rubber packing 11 for sealing the gap between the mouthpiece 1 and the receiving metal fitting 10 is fitted, is provided in the lower part of the inner wall surface of the receiving metal fitting 10 in the center of the inner wall surface of the receiving metal fitting 10. A projecting edge 10b is provided in a ring shape near the portion.

A fastening ring 12 having a pressing edge 12a protruding inwardly formed at the lower end is screwed into the lower end of the receiving metal fitting 10.

A ring-shaped seat plate 13a is provided on the projecting edge 12a of the fastening ring 12, and three projecting portions 13b projecting from the upper surface of the seat plate 13a and arranged at equal intervals in the circumferential direction. A claw seat 13 that is sandwiched between the base 1 and the fastening ring 12 is installed.

Between the lower end surface of the receiving metal fitting 10 and the seat plate 13a of the pawl seat 13, the planar shape of the fastening ring 12 is curved in an arc shape, and is sandwiched between the base 1 and the fastening ring 12. , Three movable claws 1 detachably hooked on the hooking surface 2 of the base 1.
4 is installed so as to be movable in the radial direction of the tightening ring 12, and a sliding contact surface 14a that is inclined upward inward is formed on the inner side surface of each movable claw 14.

At the outer side surface of each movable claw 14, the central portion of a leaf spring 15 whose both ends are pressed against the inner side surface of the tightening ring 12 is screwed, and each movable claw 14 is fastened by the leaf spring 15 to the tightening ring 12.
Are urged toward the center of each.

When the water valve A is attached to the fire hydrant B, when the water valve A is placed on the mouthpiece 1 of the fire hydrant B and pushed down, the sliding contact surface 14a of each movable claw 14 is attached to the mouthpiece 1 of the mouthpiece 1. The movable claws 14 are pushed outward by the upper edge of the mouthpiece 1 in sliding contact with the upper edge, and the lower part of the receiving metal fitting 10 is fitted into the large-diameter portion 1a of the base metal 1, and the lower end surface of the receiving metal fitting 10 is hooked. When the movable claws 14 are aligned with the stop surface 2, the movable claws 14 are moved inward by the spring pressure of the leaf springs 15 so that the tips of the movable claws 14 are respectively locked to the locking surfaces. When it is screwed upward and fastened to the receiving fitting 10, the movable claws 14 are fixed to the base 1 and the receiving fitting 10, and the water valve A for water is connected to the base 1.

When removing the water valve A from the fire hydrant B, the tightening ring 12 is unscrewed, and then the push wheel 3 of the fire hydrant B is pushed up, and each movable claw 14 is pushed outward by the push wheel 3. When detached from the hook surface 2, the water valve A for water can be lifted and removed from the base 1.

The valve box 5 has a specific gravity slightly smaller than that of water, and the upper part of the stepped cylindrical float 16 that comes into contact with and separates from the small air hole valve seat 8 to close and open the small air hole 8a is pulled out. When the tap water valve A is connected to the base 1, the lower part of the float 16 is connected to the base 1 in a stopped state with a gap.
Is charged inside.

The float 16 floats by the buoyancy of water and moves up and down with the water surface. When the water level in the water pipe is high under pressure, the float 16 comes into contact with the lower surface of the small air hole valve seat 8 and the small air hole 8a floats. The air that has been blocked by 16 and has flowed into the valve box 5 through the gap between the valve box 5 and the float 16 from the water pipe is trapped in the valve box 5. When the amount of air in the valve box 5 increases and the water level in the water pipe becomes low, the float 16 is pushed down to be temporarily separated from the small air hole valve seat 8, and the small air hole 8a is opened to open the valve box 5 The air inside is instantaneously discharged out of the water valve A through the small air hole 8a and the exhaust hole 7, and when the air is discharged, the float 1
6 instantly returns to close the small air hole 8a.

Next, the operation and effect of the embodiment having the above configuration will be described. In this example, the upper part is inserted into the valve box 5 and the lower part is the fire hydrant B at the central part of the lower surface of the lid 6 which is connected to the upper end of the cylindrical valve box 5 having the receiving metal fitting 10 connected to the lower end. A small air hole valve seat 8 for contacting and separating the float 6 inserted into the mouthpiece 11 is attached, and in the tightening ring 12 screwed into the receiving metal fitting 10, is biased inward by a leaf spring 15. Three movable claws 14 that are detachably locked to a locking surface 2 formed near the upper end of the base 1 are installed so that the tightening ring 12 can move in the radial direction.

Therefore, the tap water valve A can be easily attached / detached to / from the mouthpiece 1 of the fire hydrant B with one touch without drilling a screw hole in the conduit or using a screwdriver. It is possible to reduce the size and weight of A to simplify the handling of the water supply air valve A and reduce the cost of the discharge mechanism that discharges air from the inside of the water supply pipeline.

Further, since the function of the air valve can be added to the fire hydrant B simply by mounting the water valve A on the fire hydrant B, even if the existing fire hydrant attached to the water pipe is used, The function as a valve can be easily added.

[Brief description of drawings]

FIG. 1 is a side sectional view of a water air valve according to an embodiment of the present invention, showing a state before the water air valve is attached to a fire hydrant.

FIG. 2 is a half-side sectional view showing a state in which a water valve is attached to a fire hydrant.

3 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Mouth 2 Hooking surface 5 Valve box 6 Lid plate 8 Small air hole valve seat 10 Receiving metal fitting 12 Closing ring 14 Movable pawl 15 Leaf spring A Water valve for water supply B Fire hydrant

Claims (1)

[Claims] 1. A water valve for water supply, which is detachably connected to a base of a fire hydrant connected to a water supply line,
An upper part is inserted into the valve box and a lower part is inserted into the mouthpiece at a central portion of a lower surface of a lid plate connected to an upper end part of a cylindrical valve box having a lower end part to which a receiving metal fitting is connected. A small air hole valve seat that allows the float to come into contact with and separate from it is attached, and a spring is biased inwardly in the tightening ring that is screwed into the receiving metal fitting, and is attached to a catching surface formed near the upper end of the base. An air valve for water supply, wherein a plurality of movable claws that are detachably hooked are installed so as to be movable in the radial direction of the fastening ring.