JPH10176762A - Flow regulating valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow regulating valve capable of quickly dealing with a flow rate change by supporting a needle in a valve body having a cap attached to its upper part via a spring or the like and performing flow regulation and valve full opening/closing according to the strength of the spring. SOLUTION: A fluid flowed through a pipe presses a needle 2 in a valve body 1 to press a spring 3, and the needle 2 is held in a place where the fluid and the spring 3 are balanced in force. The spring 3 is inserted into a core bar 9 so as to be prevented from being separated from the needle 2, and the rear end of the spring 3 is carried by a supporting plate 4. When the pressure of the fluid abnormally increases, the needle 2 is pushed backward and, when the rear part of the needle 2 is contacted with a valve seat 5, the flowing of the fluid is surely stopped by the needle 2 and the valve seat 5. Further, when the pressure of the fluid decreases, the force of the spring 3 takes the upper hand to separate the needle 2 from the valve seat 5 and the fluid is caused to flow out again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve capable of automatically and instantaneously adjusting a flow rate by a spring.

[0002]

2. Description of the Related Art There are manual valves and automatic valves for adjusting the flow rates of liquids and gases.

[0003]

In the case of a conventional manual valve, the opening degree of the valve is determined by manually moving the handle in advance, so that the opening degree remains the same unless the opening degree is changed manually next time. . Therefore, the opening does not change even if the condition before the valve changes and the flow rate and pressure become large, so that a large amount of fluid flows in the piping and abnormalities occur in equipment and tanks behind the manual valve, and in some cases, It could be damaged and cause a serious accident. In the conventional automatic regulating valve, the flow rate sensed by the flow rate sensing sensor is operated automatically by a motor or cylinder by electricity or air through a converter to adjust the opening automatically. It cannot be used if the pipe is broken or blocked. In addition, noise is picked up from other electric devices, which causes a malfunction. If the atmosphere is acid- and alkali-resistant, it cannot be used unless accessories other than the valve are acid- and alkali-resistant, or the motor and scylling are not protected. When the atmosphere is explosion-proof, there is a problem that the weight becomes heavy, the mounting space becomes large, and the handling becomes very troublesome. In tanks and gums, there was a problem that the liquid accumulated too much in front of the valve and overflowed or broke.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised in view of such problems of conventional products. In this flow rate control valve, the pressure of the fluid is applied to the needle having the spring, and the needle is pushed to reduce the distance from the valve seat, so that the area through which the fluid passes decreases,
The flow resistance is automatically adjusted as the resistance of the fluid increases. In other words, even if an abnormal high-pressure fluid flows, the spring contracts and the needle comes into contact with the valve seat to completely stop the fluid (protects the equipment and tank after the flow rate regulating valve), and the pressure of the fluid returns to normal Then, the spring expands according to the pressure and the fluid starts flowing again.

[0005]

FIG. 1 to FIG. 10 illustrate an embodiment of the present invention. The fluid flowing through the pipe pushes the spring 3 by pushing the needle 2 inside the valve body 1, and the needle 2 holds its position when the force of the fluid and the spring is balanced. Spring 3
The core rod 9 passes through the needle 2 so as not to come off (the needle 2 and the core rod may be integral or separate). Since the rear end of the spring 3 is in contact with the support plate 4, the spring 3
And the needle 2 does not go behind the support plate 4. When the pressure of the fluid rises abnormally, the needle 2 is pushed backward, and when the rear part of the needle 2 comes into contact with the valve seat 5, the needle 2 and the valve seat 5 have a wedge relationship, so that the flow of the fluid can be more reliably performed. Can be stopped. When the pressure of the fluid decreases, the force of the spring 3 wins, the needle 2 separates from the valve seat 5, and the fluid flows again. A pressing plate 6 is attached to the needle 2 so that the needle 2 does not come out forward by the force of the spring 3. The core rod 9 of the needle 2 has an appropriate length so as not to fall out of the support plate 4. When the valve is fully closed to fully open, the needle 2 has a conical shape, so that the needle 2 always fits (comes to the center) while the conical surface extends along the holding plate 6. FIG. 5 shows the shape of the holding plate 6, the lower part being fitted into the valve body, and the upper part being held down by the lid so as not to move. This is also because the presser plate 6 prevents the needle 2 from falling down. When the lid 7 is removed from the valve body 1, the internal parts can be replaced, inspected and cleaned. Further, the pipe connection portion of the valve body 1 and the lid 2 can be attached with screws or flanges.

[0006]

Since the present invention is configured as described above, it has the following effects. Since the opening of this flow control valve is adjusted only by the strength of the spring, a manual opening / closing handle is not required unlike a conventional manual valve, and it can respond instantaneously to a flow rate change. This flow control valve eliminates the inconvenience that a conventional automatic valve can adjust the flow through a flow sensor, but requires the power of a motor, cylinder, etc. Can be opened and closed. Therefore, the construction of electric and air piping is unnecessary, and there is no fear of malfunction due to power failure or noise from other devices. Since the flow rates of various liquids and gases can be automatically adjusted,
Not only does it help save water and save energy, it also has fewer parts than conventional valves, so it is easy to replace and inspect and clean simply by opening the lid of the valve body without having to remove the valve from the piping. There are advantages. Various flow rates and pressures can be accommodated by simply changing the spring with one valve. With the conventional technology, if the atmosphere is acid and alkali resistant,
A protective cover must be attached to the motor or cylinder (there is no acid or alkali resistant product for the motor or cylinder), but it is not necessary. In the case of explosion proof, the weight becomes heavy and the mounting space becomes large. However, the flow control valve does not require power such as a motor or a cylinder and does not use electricity, so that it does not become heavy or large. If the liquid in the tank or dam is too high before the valve,
Since the needle is pushed according to the pressure to release the liquid, the tank and the dam can be protected and an accident can be prevented.

[Brief description of the drawings]

FIG. 1 is a front sectional view of the present invention (in a case of a small flow rate, a valve is fully opened).

FIG. 2 is a plan view of the present invention (with a lid removed).

FIG. 3 is a side view of the present invention.

FIG. 4 is a front sectional view of the present invention (when the flow rate is large, the valve is fully closed).

FIG. 5 is a view of a holding plate of the present invention.

FIG. 6 is a view of a support plate of the present invention.

FIG. 7 is a front sectional view of the present invention (the valve is in an intermediate opening state).

FIG. 8 is a sectional front view of the present invention (fully closed state without a valve seat).

FIG. 9 is a front sectional view of the present invention (fully closed state before discharging the liquid).

FIG. 10 is a front sectional view of the present invention (in a fully opened state after the liquid is discharged).

[Explanation of symbols]

 1 is a valve body 2 is a needle 3 is a spring 4 is a support plate 5 is a valve seat 6 is a holding plate 7 is a lid 8 is a packing 9 is a core rod

Claims (1)

[Claims] A needle and a spring, a support plate, a valve seat, a holding plate, and a core rod are provided in a valve body, and a lid is mounted on an upper portion of the body. A flow control valve that can be fully closed.