JP2711874B2 - Opening and closing lever device for valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial Application Field) The present invention relates to a valve opening / closing lever device to be mounted on a valve, such as a butterfly valve or a ball valve, which rotates and opens and closes by approximately 90 to 180 degrees. A two-stage valve-opening device to prevent the flow rate from increasing suddenly during the valve-opening rotation operation, causing an excessive flow rate, an instantaneous increase in flow velocity, and a dynamic impact on the piping. The present invention relates to an opening / closing lever device for a valve.

(Prior Art) A valve opening / closing lever device for a valve, such as a butterfly valve or a ball valve, which opens and closes by rotating about 90 degrees to about 180 degrees, includes a fully open position and a fully closed position, or a fully open position and a fully closed position. In many cases, a lock device for fixing the lever is provided at any of a plurality of intermediate opening positions in addition to the position.

In such a conventional valve opening / closing lever device, when the valve in the fully closed state is opened, the lever is held together with the locking lever to release the fixing of the lever in the fully closed position, and the valve opening rotation operation is performed as it is. .

When a valve such as a butterfly valve or a ball valve is fully closed, a closing member such as a disc or ball is in wide contact with the valve body seat. The degree of adhesion at the contact part due to the time keeping increases, and especially in the case of an elastic sheet such as rubber or resin, the viscoelastic deformation due to long-term compression of the sheet causes the fully-closed closing member to open. The torque required to start in the direction is extremely large. Therefore, in order to open the valve in the fully closed state, the lever must be opened and rotated with an extremely large force at the time of starting.

However, once the closing member is started in the valve closing direction, the frictional resistance of the contact portion is reduced, and in particular, when a flow path is formed between the closing member and the seat of the valve body, the fluid hung on the closing member The differential pressure drops and the contact surface pressure also drops sharply,
The lever can be operated with extremely small force.

For this reason, the large force applied for starting causes the valve to suddenly open to a large opening and closes, instantaneously increasing the flow velocity, giving a dynamic shock to the piping, generating vibration and noise in the piping, etc. However, there is a problem that the pipe connection is loosened to cause leakage.

FIG. 3 is a longitudinal sectional view showing a butterfly valve described in Japanese Utility Model Laid-Open No. 60-81369 as an example of the above-described conventional valve opening / closing lever device.

In FIG. 3, 21 is a butterfly valve, 22 is an opening / closing lever device, 23 is a valve shaft, 24 is a disc as a closing member, 25 is a valve body, 26 is a seat, 27 is a plate, 28 is a lever,
29 is a locking lever and 30 is a spring. FIG. 4 is a bottom view of the plate 27.

3 and 4, the disc 24 is fixed to the valve shaft 23, and the lever 28 fixed to the valve shaft 23 is rotated to open and close the butterfly valve 21. Further, a locking lever 29 is hindered by a pin 31 on the lever 28, and a spring 30 is mounted between the lever 28 and the locking lever 29. FIG. 3 shows a state in which the locking lever 29 is gripped together with the lever 28, and the locking lever 29 opposes the resilient force of the spring 30 and the grip portion 29a of the locking lever 29 approaches the grip portion 28a of the lever 28. Is shown. In this state, the distal end portion 29b of the locking lever 29 is separated from the outer peripheral groove 27a provided in the plate 27. However, when the locking lever 29 is released, the distal end portion of the locking lever 29 is released by the elastic force of the spring 30. 29b is the outer circumferential groove 27a of the plate 27
And the rotation operation of the lever 28 is prevented.

As shown in FIG. 3, in the valve closed state, the locking lever 29 is grasped together with the lever 28, and the tip portion 29b of the locking lever 29 is removed from the outer peripheral groove 27a of the plate 27.
When the valve 24 is to be closed and rotated, the disc 24 is
The rubber sheet 26 is firmly adhered to the disc 24 by viscoelastic deformation due to long-time compression in addition to high contact surface pressure due to fluid pressure. For this reason,
The torque required to start the fully closed disk 24 in the valve opening direction is extremely large. Therefore, in order to open the valve in the fully closed state, the lever 28 must be opened and rotated with an extremely large force at the time of starting.

However, once the disk 24 is started in the valve opening direction, the frictional resistance between the disk 24 and the seat 26 is reduced. In particular, when a flow path is formed between the disk 24 and the sheet 26, the disk 24 and the sheet 26 The contact surface pressure with the lever 28 also decreases rapidly, and the lever 28 can be rotated with a very small force.

For this reason, the large force applied for starting causes the lever 28 to rotate and operate to a large opening, so that the flow velocity instantaneously increases, giving a dynamic shock to the piping, generating vibration and noise in the piping. And has a problem of causing leakage by causing the pipe connection to be loosened.

(Problems to be Solved by the Invention) The present invention provides a valve opening / closing lever device of the above-described conventional type, in which the valve is opened and rotated to a large opening degree when the valve is opened to generate vibration or noise in the piping. Another object of the present invention is to solve the problem of causing the pipe connection to be loosened to cause leakage.

Configuration of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration.

That is, a valve opening and closing lever device that opens and closes the valve by rotating the valve shaft substantially 90 degrees to substantially 180 degrees,
The valve opening / closing lever device prevents the valve opening operation at an appropriate valve opening position within approximately 45 degrees from the fully closed position during the valve opening rotation operation, and after releasing the inhibition, the valve opening rotation operation can be performed until the valve is fully opened. A valve opening / closing lever device equipped with a two-stage valve opening operation device capable of closing the valve without being blocked from the fully open position to the fully closed position during the valve closing rotation operation.

Further, in this valve opening / closing lever device, a pin insertion hole is provided in the lever of the valve opening / closing lever device in parallel with the valve shaft mounting hole, and a pin resiliently inserted by a spring is inserted into the pin insertion hole. A plate is fixed to the protruding surface of the valve shaft, and an arc-shaped groove is provided that slides while one end of the pin repelled by the plate is inserted from the fully open position to an appropriate valve opening position within approximately 45 degrees from the position. A two-stage valve-opening device having a knob provided at the other end of the pin to pull up the pin against the elastic force of the spring to extract the one end from the arc-shaped groove. Is good.

Further, the lever is provided with a locking lever, and the plate is provided with a locking claw of the locking lever at any one or more or all of the fully closed position, the fully opened position and the intermediate opening position. It is preferable that an outer peripheral groove or hole is provided.

(Operation) Since the valve opening / closing lever device of the present invention is configured as described above, it operates as follows.

First, in the fully closed position, the pin inserted into the pin insertion hole of the lever has one end fitted into the arc-shaped groove of the plate by the resilient force of the spring, and the lever is provided with a locking lever. When the pawl is engaged with the locking outer peripheral groove or hole in the fully closed position of the plate, the locking lever is squeezed together with the lever to release this engagement, and the lever can be opened and rotated. To

Next, when the lever is rotated to open the valve, one end of the pin slides in the arc-shaped groove, but this arc-shaped groove has a length from the fully closed position to an appropriate valve opening position within approximately 45 degrees. The valve opening rotation operation is blocked at this appropriate valve opening position.

For this reason, the valve opening operation is interrupted once at the appropriate valve opening position where the flow rate does not suddenly increase, there is no sudden rise in the flow velocity, no dynamic shock is applied to the piping, and vibration and noise are generated in the piping. It does not cause leakage or loosening of the pipe connection part.

After that, holding the pin with the knob, pulling the pin up against the spring, and pulling out one end of the pin from the arc-shaped groove, slightly rotating the lever to open the pin will release the pin, even if you release the knob. One end is in contact with the groove-free surface of the plate and does not prevent the valve opening rotation operation, so that the valve opening rotation operation can be performed to the fully closed position.

The reason that a large force is required during the valve opening rotation operation is that
As mentioned before, only at the start, the lever is largely rotated by the inertia of the large force applied at the time of the start, but if it is stopped once in the appropriate valve open state, it will be thereafter Since the valve opening operation can be performed with a relatively small force and the operation can be performed at an appropriate valve opening speed, problems such as vibration and noise do not occur.

Next, when performing the valve closing rotation operation from the fully open position, a slightly large force is required at the time of starting, but the force is not as large as at the time of the valve opening start, so that a large inertia does not occur, and the closing operation for a while from the fully open position is performed. During the valve rotation operation, since the flow rate and the flow velocity change only slowly, there is no adverse effect such as vibration and noise.

When the lever closing operation is advanced, one end of the pin slides on the plate, and is inserted into the arc-shaped groove by the elastic force of the spring, but the rotation operation is not blocked until the fully closed position. .

As described above, the valve opening / closing lever device of the present invention is provided with the two-stage valve opening operation device that is operated in two stages during the valve opening rotation operation.

Further, in the valve opening / closing lever device of the present invention, the lever is provided with a locking lever, and the plate is provided with a locking outer peripheral groove or hole, so that any one of a fully closed position, a fully opened position and an intermediate opening position is provided. In all or all of the above, when the locking claw of the locking lever is engaged with the locking outer circumferential groove or hole,
The rotation of the lever can be prevented at these positions, and the valve is not accidentally opened or closed due to contact or the like.

Hereinafter, the present invention will be described with reference to examples.

FIG. 1 is a partial sectional front view of a butterfly valve provided with an embodiment of a valve opening / closing lever device of the present invention.

In FIG. 1, 1 is a butterfly valve, 2 is a valve opening / closing lever device, 3 is a two-stage valve opening operation device, 4 is a valve shaft,
5 is a lever, 6 is a pin, 7 is a spring, 8 is a valve body, 9
Is a plate, and the lever 5 is formed with a valve shaft mounting hole 5a for mounting on the valve shaft 4 and a pin insertion hole 5b for inserting the pin 6, and the plate 9 has one end 6a of the pin 6 inserted therein. An arc-shaped groove 9a is formed, and the other end 6b of the pin 6 has a knob 6c.
Is provided. The plate 9 is fixed to the valve shaft protruding surface 8a of the valve body 8, and the pin insertion hole 5b is a valve shaft mounting hole.
Parallel to 5a, the pin 6 is inserted in a state of being spring-loaded by the spring 7.

The knob 6c is used to pull up the pin 6 against the resiliency of the spring 7 and to pull out one end 6a from the arc-shaped groove 9a.

Further, the lever 5 is provided with a locking lever 10 which is resiliently pushed by a locking lever spring 12 by a locking lever pin 11, and the plate 9 is provided with a locking claw at the tip of the locking lever 10. An outer peripheral groove 9b for locking with which 10a is engaged is provided.

FIG. 2 is a plan view of the plate 9, wherein 9a is an arc-shaped groove, and 9b is an outer peripheral groove for locking. Reference numerals 9c and 9d denote stopper portions at which the lock claw 10a of the locking lever 10 abuts at the fully closed position or the fully closed position. The outer peripheral groove 9b for locking is
Although shown in the figure at the fully closed position and the fully open position, an appropriate number may be provided at any intermediate opening position.

Next, the operation will be described based on the embodiment shown in FIG. 1 and FIG.

First, in the fully closed position shown in FIG. 1, one end 6a of the pin 6
Has been fitted. Also, the locking claw 10 of the locking lever 10
a is engaged with the locking outer peripheral groove 9b of the plate 9.

Hold the locking lever 10 together with the lever 5 and lock the claw.
The engagement between the outer peripheral groove 9b and the outer peripheral groove 9b is released, so that the lever 5 can be opened and rotated.

Next, when the lever 5 is rotated to open the valve, the one end 6a of the pin 6 slides in the arcuate groove 9a, and this arcuate groove 9a extends from the fully closed position to an appropriate valve opening position within approximately 45 degrees. Therefore, the one end 6a abuts on the end of the arc-shaped groove 9a, and the valve opening rotation operation is prevented at this appropriate valve opening position.

For this reason, the valve opening operation is interrupted once at the appropriate valve opening position where the flow rate does not suddenly increase, there is no sudden rise in the flow velocity, no dynamic shock is applied to the piping, and vibration and noise are generated in the piping. It does not cause leakage or loosening of the pipe connection part.

Thereafter, the pin 6 is pulled up against the spring 7 with the knob 6c of the pin 6 and the one end portion 6a of the pin 6 is pulled out from the arc-shaped groove 9a, and the lever 5 is slightly opened and rotated. When the part 6c is released, one end 6a of the pin 6
Since the valve is in contact with the surface having no groove and does not prevent the valve opening rotation operation, the valve opening rotation operation can be performed to the fully closed position.

It should be noted that a particularly large force is required at the time of the valve-opening rotation operation only at the time of starting, as described above in the conventional example, and the inertia of the large valve-opening rotation operating force applied at the time of the starting causes the lever 5 to move. The rotation is largely performed, but once this is stopped in an appropriate valve opening state, the valve opening rotation operation can be performed with a relatively small force thereafter, and the operation can be performed at an appropriate valve opening speed. Therefore, problems such as vibration and noise do not occur.

Next, when performing the valve closing rotation operation from the fully open position, a slightly large force is required at the time of starting, but the force is not as large as at the time of the valve opening start, so that a large inertia does not occur, and the closing operation for a while from the fully open position is performed. During the valve rotation operation, since the flow rate and the flow velocity change only slowly, there is no adverse effect such as vibration and noise.

When the rotation of the lever 5 is advanced, one end of the pin 6
6a slides on the plate 9 and is eventually inserted into the arc-shaped groove 9a by the resilient force of the spring 7, but does not prevent the rotation operation until the fully closed position.

As described above, the valve opening / closing lever device 2 is provided with the two-stage valve opening operation device 3 that is operated in two stages during the valve opening rotation operation.

Further, the valve opening / closing lever device 2, the lever 5 is provided with a locking lever 10, and the plate 9 is provided with a locking outer peripheral groove 9b.
In the fully closed position or the fully open position, when the lock claw 10a of the locking lever 10 is engaged with the outer peripheral groove 9b,
The rotation of the lever 5 can be prevented at these positions, and the valve is not opened or closed carelessly due to contact or the like.

When the lock lever 10 is gripped together with the lever 5, the lock lever 10 compresses the lock lever spring 12 and rotates about the lock lever pin, thereby disengaging the lock claw 10a from the outer peripheral groove 9b. , The lever 5 can be opened or closed.

Advantageous Effects of the Invention The present invention is configured and operates as described above in detail, so that the following excellent effects can be obtained.

When operating the valve opening and closing lever device that opens and closes by rotating the valve shaft approximately 90 to 180 degrees from the fully closed position, a large operating force is applied to overcome the large resistance at the start and start. Occasionally, the inertia causes the valve to open to a large opening and closes, instantaneously producing a flow with a high flow rate and a large flow rate.Dynamic impact causes vibration and noise in the piping, and slack in the piping connection. It does not cause leakage.

In addition, the two-stage valve opening operation device can perform the valve closing rotation operation with one operation when the valve is closed.

Further, a lock device for fixing the lever at the fully open position, the fully closed position, and the intermediate opening degree can be provided.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view showing a butterfly valve provided with an embodiment of a valve opening / closing lever device of the present invention, and FIG. 2 is a plan view of a plate shown in FIG. FIG. 3 is a longitudinal sectional view showing a butterfly valve provided with a conventional valve opening / closing lever device, and FIG. 4 is a bottom view of the plate of FIG. 2 Opening / closing lever device for valve 3 Two-stage valve opening operating device 4 Valve stem 5 Lever 5a Valve shaft mounting hole 5b Pin insertion hole 6 Pin 6a One end , 6b… The other end 6c… Knob, 7… Spring 8… Valve body, 8a… Valve shaft protruding surface 9… Plate, 9a… Arc-shaped groove 9b… Outer peripheral groove, 10… Lock lever 10a Lock lock claw

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masakazu Morioka 5-1-1, Hirano-cho, Higashi-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (56) References Japanese Utility Model Showa 55-71872 (JP, U)

Claims (3)

(57) [Claims] 1. A valve opening / closing lever device for opening / closing a valve by rotating a valve shaft substantially 90 degrees to substantially 180 degrees,
The valve opening / closing lever device prevents the valve opening operation at an appropriate valve opening position within approximately 45 degrees from the fully closed position during the valve opening rotation operation, and after releasing the inhibition, the valve opening rotation operation can be performed until the valve is fully opened. A valve opening / closing lever device having a two-stage valve opening operation device capable of closing a valve without being blocked from a fully open position to a fully closed position during a valve closing rotation operation. 2. A pin insertion hole is provided in the lever of the valve opening / closing lever device in parallel with the valve shaft mounting hole, and a pin resiliently inserted by a spring is inserted into the pin insertion hole. The plate is fixed, and an arc-shaped groove is provided in which one end of the pin repelled by the plate is slid while being inserted from the fully open position to an appropriate valve opening position within approximately 45 degrees from the full open position. 2. The valve opening / closing lever according to claim 1, further comprising a two-stage valve opening operation device having a knob at an end thereof for pulling up the pin against the elastic force of the spring and extracting the one end from the arc-shaped groove. apparatus. 3. A locking lever is engaged with the lever, and a locking claw of the locking lever is engaged with the plate at any one or more or all of a fully closed position, a fully opened position and an intermediate opening position. 3. The valve opening / closing lever device according to claim 2, further comprising an outer peripheral groove or hole for locking.