JP2001289344A - Emergency cutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy so as to react to the fine pressure reduction and to easily adjust the resisting force and the movable range of a shaft provided with a valve element from outside, and to change a fastening margin of the valve element and a seat for adjustment and to commonly use one pilot valve. SOLUTION: This emergency cutoff valve is installed between a water-supply equipment and a water reservoir, and cuts the flow between the water reservoir in emergency so as to secure the water. A closing seat of at least one valve element is formed into a taper shape, and the seating force and the fastening margin of a coil spring for elastically energizing a receiver plate for receiving the water pressure and an abutment receiver provided at a tip of a shaft provided with a valve element can be adjusted from outside. The seat to be energized by the coil spring is formed into a separate type so as to prevent the generation of torsion due to the rotation. A lock device to be used for reset in a field is optionally provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an emergency shutoff valve,
In particular, water supply facilities and water tanks are connected, and water is usually passed through the water tanks, and in the event of an emergency such as an earthquake, the shaft with a valve body is automatically activated to shut off water flow to the water tanks The present invention relates to an emergency shut-off valve designed to secure a predetermined amount of water in a water storage tank.

[0002]

2. Description of the Related Art Various types of emergency shut-off valves of this type have been known in the prior art, and many types using an axis provided with a valve element are known. In many cases using a shaft equipped with this valve element or using a rotor, the water pressure is applied alternately to the water flow, and the complete shutoff action is not achieved even by residual pressure, and the water pipe is damaged. When the water pressure reaches zero, the work is complete.

[0003]

Therefore, the present invention has better accuracy,
Sensitive to pressure reduction, the opposing force and the movable range of the shaft with the valve can be easily adjusted from the outside, and the tightening allowance of the valve and the seat can be changed and adjusted. It is an object of the present invention to provide an emergency shut-off valve which can be realized by a single one.

[0004]

In order to achieve this object, an emergency shut-off valve according to the present invention is installed between a water supply facility and a water storage tank, and usually aims at water flow through the above-mentioned water storage tank. It is an emergency shutoff valve that shuts off water flow to the water tank in an emergency to secure a predetermined amount of water, and uses a shaft equipped with a valve body, and has a closing seat for at least one of the valve bodies. A contact spring at a tip end of a shaft provided with a coil spring and a valve body, which has a tapered shape and resiliently receives a receiving plate receiving water pressure, is capable of adjusting a seating force and a tightening allowance from outside by a position nut. Wherein at least one of the resilient seats of the coil spring is separated.
It is characterized in that it is prevented from twisting due to rotation as a prototype, at least one or more three-way pilot valves are used, and it is equipped with a locking device used only for return on site as an option I have.

[0005]

With this configuration, it is possible to adjust the operation, set the tolerance of the stroke, and easily set the return pressure, thereby providing an easy-to-use and high-precision emergency shut-off valve.

[0006]

Next, preferred embodiments of the present invention will be described with reference to the drawings. 1 is a sectional plan view showing the structure of an emergency shut-off valve embodying the present invention, FIG. 2 is a front view, FIG. 3 is a side view, FIG. 4 is a block diagram, and FIG. 5 is a block diagram showing another example. FIG.

In these figures, reference numeral 1 denotes a casing, and the casing 1 is formed with a primary inlet 2 connected to a water supply system. This primary inlet 2
The water that has flowed in through the first communication port 3 is sent to the water supply port 4 connected to the water storage tank, and flows into the water storage tank.

The casing 1 is provided with a reflux inlet 5 which flows in from the above-mentioned water storage tank by water pressure, and the water flowing from the reflux inlet 5 passes through the second communication port 6. It is discharged out of the casing 1 through the discharge port 7.

On the other hand, in the figure, reference numeral 8 denotes a shaft provided with a valve body. The shaft 8 provided with the valve body is provided with a first valve body 9 for closing the first communication port 3 and a second valve body 9 in case of emergency. Second valve bodies 10 for closing the two communication ports 6 are fastened and fixed by fastening rings and nuts, respectively, and are attached at a predetermined distance.

The peripheral edges of the first valve body 9 and the second valve body 10 increase the sealing performance with the seat, increase the strength, do not rust even if the surroundings are worn, and have the O-ring formed by internal pressure. O-rings 11 each containing a stainless steel core are wound around each of them so that the O-rings 11 can function without slipping out or jumping out.

The first valve body 9 normally constitutes a part of the flow path wall as a gate valve for regulating the flow direction of water.
The first communication port 3 forms a tapered surface 12 on the inner surface of the opening,
The degree of fitting of the first valve body 9 can be adjusted to achieve more accurate sealing.

Reference numeral 13 in the figure denotes a guide cap for guiding the slide of the shaft 8 provided with a valve body to prevent vibration.

A piston body 14 is provided at the rear end of the shaft 8 having the above-mentioned valve body. The piston body 14 is slidable in a cylinder body 15 fixed to the casing 1.

A guide bar 16 is attached to the piston body 14, and a rear end of the guide bar 16 is extended outside the cylinder body 15 so as to display an opening degree of the valve body and a lock device 2.
An indicator 17 with an operating cam, which also serves as the operating cam 9, is fixed.

The piston body 14 in the cylinder body 15
The two coil springs 19 and 20 having different diameters and lengths are resiliently provided between the coil springs 18 and the spring receiver 18, and the first valve body 9 and the second valve body 10 always keep the piston body 14 in the first series. It is urged in a direction to close the communication port 3 and the second communication port 6.
The above-mentioned spring receiver 18 is of a separate type so that the coil springs 19 and 20 are not twisted at the time of external pressure adjustment described later.

A pressure regulating member 21 is provided outside the cylinder body 15 by passing the above-mentioned guide bar 16 therethrough.
By turning the pressure adjusting member 21 with a wrench, it is possible to simultaneously adjust the pressure of the coil springs 19 and 20 from the outside.

Further, in the figure, reference numeral 22 denotes a stopper against which the tip of the shaft 8 having the valve element is pressed.
The position can be adjusted by a nut member 23 provided outside the casing 1 so that the sliding limit of the shaft 8 having the valve body can be set.

In the figure, reference numeral 24 denotes a pilot valve. The pilot valve 24 has a primary inlet 2.
Water is supplied through a strainer 26 on the way by a water guide pipe 25. The pilot valve 24 is of a three-way port type, and is also connected to the diaphragm portion from a pressure gauge 27 branching from the middle of the water conduit 25.

The water that has passed through the pilot valve 24 is sent to the primary side of the piston body 14 in the cylinder body 15, and the water pressure pushes the piston body 14 against the urging force of the coil springs 19 and 20, and the valve body Is stably positioned, and the first valve body 9 and the second valve body 10 open the first communication port 3 and the second communication port 6. Reference numeral 28 denotes a manually operated drain valve which is normally closed.

FIG. 29 shows a lock device which implements a utility model which is owned by the applicant as No. 256424, and which is optionally mounted for return on site. In the case of automatic return, the valve 30 which is opened
Is used. Reference numeral 31 denotes an indicator with an operation cam attached to the guide bar 16 for operating the lock device 29.

FIG. 5 shows a second embodiment of the present invention. In this case, the first pilot valve 24 is used.
a and the second pilot valve 24b are incorporated in the mechanism, 24a serves to adjust the return pressure set value, and 24b serves to adjust the cutoff pressure set value.

[0022]

The emergency shut-off valve according to the present invention operates and operates as described above. For this reason, the precision is improved, the handling is easy, and the price can be reduced and supplied to the user.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a structure of an emergency shut-off valve embodying the present invention.

FIG. 2 is a front view.

FIG. 3 is a side view.

FIG. 4 is a block diagram.

FIG. 5 is a block diagram showing another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Primary-side inflow port 3 First serial port 4 Water supply port 5 Recirculation inflow port 6 Second communication port 7 Discharge port 8 Shaft provided with valve element 9 First valve element 10 Second valve element 11 O-ring Reference Signs List 12 taper surface 13 guide cap 14 piston body 15 cylinder body 16 guide bar 17 indicator with operating cam 18 spring receiver 19 coil spring 20 coil spring 21 pressure regulating member 22 stopper 23 nut member 24 pilot valve 24a first Pilot valve 24b Second pilot valve 25 Water pipe 26 Strainer 27 Pressure gauge 28 Drain valve 29 Lock device 30 Valve 31 Indicator with operating cam

Continued on front page F-term (reference) 3H056 AA01 BB32 BB47 CA01 CB02 CD06 EE06 GG05 3H060 AA02 BB08 CC02 CC22 DD05 DF08 GG08 HH03 HH14 3H061 AA10 BB02 CC02 CC12 DD08 EA23 EC13 GG02 GG15 3H012 DD02 CC02 DD02 FF11

Claims (4)

[Claims] 1. A water supply system is installed between a water supply system and a water storage tank, and usually water is passed through the water storage tank. In an emergency, the water flow to the water storage tank is shut off to secure a predetermined amount of water. It is an emergency shut-off valve, which uses a shaft with a valve body,
At least one of the valve bodies has a tapered closing seat, and a coil spring for resiliently receiving a water pressure receiving plate and a contact receiving body at the end of a shaft provided with the valve body are seated and tightened by a position nut from outside. Emergency shut-off valve characterized in that it is possible to adjust the amount of charge. 2. The emergency shut-off valve according to claim 1, wherein at least one of the resilient seats of the coil spring is of a separate type to prevent twisting due to rotation. 3. The emergency shut-off valve according to claim 1, wherein at least one or more three-way pilot valves are used. 4. The method according to claim 1, further comprising a locking device used only for returning to the site.
The emergency shut-off valve according to claim 2 or 3.