JPH0429687A - Manually operating lock device - Google Patents

Abstract

PURPOSE:To make an opening degree holdable relating to vibration and error handling or the like with operation facilitated by forming a stop groove, to which a stopper pin is stop-fitted, and a turn groove possible to turn the stopper pin in a range from a fully opened position to a fully closed position. CONSTITUTION:In a connector 2, its internal end part 2b is fixed coaxially to a point end part 7a of a valve shaft 7 by forming a handle mounting part in an external end part 2a. A spindle 3 is inserted to a shaft center hole 2c formed in the connector 2, and the spindle 3, whose one end part 3a is protruded from the external end part 2a of the connector 2, is resiliently placed upward by a spring 5 mounted between the spindle 3 and the valve shaft 7. A stopper pin is fixed to the spindle 3, inserted through a sliding groove 2d parallelly provided to an axial line of the connector 2, protruded to the outer in a radial direction and stop-fitted to a stop groove 6a formed in a cap 6 fixed to a body 8 of a valve. In a condition that the spindle 3 is pressed downward, the stopper pin 4 is placed in a turn groove 6b possible to turn in a range from a fully opened position to a fully closed position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to valves such as butterfly valves and ball valves that open and close by rotating the valve shaft approximately 90 degrees or approximately 180 degrees. It relates to a locking device for manual operation, in particular, it is capable of automatically locking in the fully open and fully closed positions and a specific position in between, remains locked even when the handle is removed, and This invention relates to an excellent manual locking device that is easy to unlock and rotate.

(Prior Art) Conventional locking devices for manual operation of valves such as butterfly valves and ball valves that open and close by rotating the valve shaft approximately 90 degrees or approximately 180 degrees are mostly levers for manual operation. It was attached to the handle.

FIG. 6 is a longitudinal sectional view of the manually operated butterfly valve described in Japanese Utility Model Application Publication No. 60-84868, in which the locking device 2] is assembled to the lever handle 22.
Connect the tip 23a of the lock lever 23 to the valve body 24.
The lever handle 22 is fitted into a lock groove 25a provided on the outer periphery of a disk 25 fixed to an upper flange 24a to lock the rotation of the lever handle 22, and can be unfitted and rotated.

However, if the lever handle 22 is removed to prevent erroneous or careless operation, the locking device 21 will also come off, and there is a risk that the opening degree of the valve may change due to vibration or fluid action, making it impossible to remove the lever handle 22. It had its drawbacks.

In order to solve this problem, the inventor of the present invention first invented a manual operating device 26 shown in the longitudinal cross-sectional view of FIG. The manual operating portion 2 of the connector 28 is slidably fitted.
8a, loosen the set screw 29, push down the connector 28 with the handle against the spring 30, and insert the stopper pin 31 into the locking groove 3 provided in the cap 32.
2a and put it into the rotation groove 32b, and rotate the handle to open and close the valve.

When you stop pressing down on the handle when the valve is in the fully open or fully closed position, or at some point in between, the connector 28
is raised by the elastic force of the spring 30, and the stopper pin 31
is fitted into the locking groove 31a and locked.

In this state, the set screw 29 is tightened and the handle is removed to prevent erroneous or careless operation.

However, with this structure, the handle must be rotated while being pushed down to open and close the valve, which is cumbersome to operate, especially when the valve is installed sideways or downwards with respect to the piping. Further, since the position where the force is applied to the handle is at a position laterally away from the connector 28 that is pushed down, the force that pushes down the handle becomes a force that tilts the connector 28, and the connector 28 and the cap 32 are pushed down.
Since a large frictional resistance is generated between the handle and the handle, a large amount of force is required to push the handle down, or it becomes difficult to push down the handle.

Furthermore, when the connector 28 is pushed down, the air within the cap 32 is compressed, and this compressed air acts to push the connector 28 upward.

In order to push down the connector 28, it is necessary to resist not only the elastic force of the spring 30 but also air pressure, and a large pushing down force is required.

In addition, this manual operation locking device 26 does not have any measures to prevent rainwater from entering, and rainwater may enter the cap 32 and cause internal rust, making it difficult to operate, or the cap 32 may become incompressible. water inside, making it even more difficult to push down the connector 28.

Note that FIG. 8 is a partially developed view of a cylindrical cross section centered on the axis of the valve shaft taken along the line X-Y in FIG. 3
1 indicates a rotation groove 32b that rotates between the fully open and fully open ranges.

(Problems to be Solved by the Invention) The present invention attempts to solve many problems that the conventional manual locking device has as described above, and the problems are enumerated as follows.

(1) When the handle is removed to prevent erroneous or careless operation, the locking device also comes off, and the opening degree of the valve changes due to vibration and fluid action.

(2) When opening and closing the valve, the handle must be pushed down to release the lock and the handle must be rotated to open and close at the same time, making the operation cumbersome. It is especially difficult to operate the valve when it is installed sideways or downwards in the pipe.

(3) When pushing down the handle, a large frictional resistance is generated between the connector and the cap, which may require a large force to push down the handle or make it difficult to push down.

(4) Since the air inside the cap is compressed when the handle is pushed down, a large pushing down force is required to overcome the repulsive forces of both the spring and the air.

(5) The cap has no waterproof measures, and rainwater can enter the cap, causing internal rust and making operation difficult.

There is incompressible water in the cap, making it more difficult to push down the connector.

Configuration of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

A locking device for manual operation of a valve such as a butterfly valve that opens and closes by rotating the valve shaft approximately 90 degrees or approximately 180 degrees, the locking device for manual operation comprising a connector having a handle attachment portion formed on the outer layer of the outer end. is coaxially fixed to the tip of the valve shaft, a spindle is inserted into the axial hole formed in the connector so that one end protrudes from the outer end of the connector, and a spring is installed between the spindle and the valve shaft. The stopper pin, which protrudes radially outward through a sliding groove provided in the connector parallel to the axis, is fixed to the spindle, and the cap through which the connector passes is fixed to the valve body, and the cap There is a locking groove in which the spindle is pushed up by the elastic force of the spring and the stopper pin is fitted and locked in the fully open and fully open positions of the valve and, if necessary, in an intermediate position. A rotation groove is formed in which the stopper pin can rotate in a range from a fully open position to a fully closed position when the stopper pin is pushed down against the resistance.

In this case, it is best to install a gasket between the cap and the valve body, and a gasket between the cap and the connector and between the connector and the spindle. It is preferable that the spindle is in a sealed state when it is pushed up, and that the sealed state is released when the spindle is pushed down.

For this purpose, the gasket installed between the connector and the spindle is attached to the ○ ring groove formed on the spindle.
The O-ring is a state in which the O-ring closely seals against the inner circumferential surface of the spindle hole of the connector when the spindle is pushed up, and comes off from the inner circumferential surface of the spindle hole when the spindle is pushed down. It is preferable to release the sealed state.

Further, it is preferable that the locking groove into which the stopper pin fits and locks in the fully open and intermediate positions is shaped so that the stopper pin can be easily removed from the locking groove only when the connector is rotated in the closing direction.

(Function) Since the locking device for manual operation of the present invention is constructed as described above, it functions as follows.

First, in the fully open position, the fully open position, and a specific position in between, the stopper pin fixed to the spindle is pushed up by the elastic force of the spring and is fitted into and locked in the locking groove formed in the cap. However, since this stopper pin passes through the sliding groove of the connector, the connector cannot be rotated. If you remove the handle from the handle mounting part of the connector in this state, you can prevent erroneous, careless, and mischief operations. is also fixed, so the valve opening will not change due to vibration or fluid action.

Next, attach the handle to the handle attachment part of the connector,
When one end of the spindle protruding from the outer end of the connector is pressed and the spindle is pushed down against the elastic force of the spring, the stock/'1' pin fixed to the spindle comes out of the locking groove and slides into the rotation groove. In this state, the handle can be rotated to open the valve, close the valve, or open the valve in an intermediate position.

Then, when you stop pressing down on one end of the spindle when it is fully open, fully open, or at a certain intermediate position, the spindle is pushed up by the elastic force of the spring, and the stopper pin fits into the locking groove and locks, causing the connector to rotate. is disabled and the valve is locked.

This manual locking device has a gasket installed between the cap and the valve body that fixes the cap, and a gasket installed between the cap and the connector and between the connector and the spindle, so it cannot be used outdoors. Also, rainwater will not get into the cap.

Furthermore, the gasket installed between the connector and the spindle is in a sealing state when the spindle is pushed up, and the sealing state is released when the spindle is pushed down, so the air inside the cap is removed by pushing down the spindle. Not compressed.

In addition, the locking groove into which the stopper pin fits and locks in the fully open and intermediate positions is shaped so that the stopper pin can be easily removed from the locking groove only when the connector is rotated in the closing direction, so it can be used in emergencies etc. Valve closing operation is easy.

(Example) Next, an example of the lock device for manual operation of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the locking device for manual operation of the present invention, and FIG. 2 is an external view of FIG. 1.

1 and 2, 1 is a locking device for manual operation, 2 is a connector, 3 is a spindle, 4 is a stopper pin,
5 is a spring, 6 is a cap, 7 is a valve stem, and 8 is a valve body.

The connector 2 has a handle attachment portion formed at its outer end 2a, and its inner end 2b is fitted onto the tip 7a of the valve shaft 7 and fixed coaxially therewith.

Further, the spindle 3 has an axial hole 2 formed in the connector 2.
c, and one end 3a is connected to the outer end 2 of the connector 2.
It protrudes from a and is urged upward by a spring 5 installed between the spindle 3 and the valve shaft 7.

The stopper pin 4 is fixed to the spindle 3, protrudes radially outward through a sliding groove 2d provided in the connector 2 parallel to the axis, and is formed on a cap 6 fixed to the valve body 8. It is fitted into and locked in the locking groove 6a.

FIG. 3 is a longitudinal cross-sectional view showing a state in which the spindle 3 is pushed down from the state shown in FIG. 2d, and is removed from the locking groove 6a into which it was inserted and locked, and enters the rotation groove 6b, which can rotate in the range from the fully open position to the fully closed position.

FIG. 4 is a partially exploded view of a cylindrical cross section taken along line A-B in FIG. 1 and centered on the axis of the valve shaft 7 and connector 2,
A locking groove 6a into which the stopper pin 4 fits and locks at specific positions between fully open, fully open, and intermediate positions, and a rotation groove 6b in which the stopper pin 4 rotates in a range from the fully open position to the fully open position are shown. .

FIG. 5 is a partially exploded view similar to FIG. 4, in which the stopper pin 4 is easily removed from the locking groove 6a into which it was fitted and locked when it is rotated from the fully open or intermediate position in the closing direction. This figure shows an example in which the fully open and intermediate locking grooves 6a are formed in a shape that can be used.

In FIGS. 1 and 3, 9 indicates the body 8 and the cap 6.
10 is the gasket installed between the cap 6
and connector 2, and 11 is an O-ring gasket installed between connector 2 and spindle 3.
These ring gaskets 9 and gaskets 10 and 11 prevent rainwater from entering the cap 6.

The O-ring 11 is an O-ring groove 3b formed in the spindle 3.
When the spindle 3 shown in FIG. 1 is pushed up, the O-ring 11 closely seals the spindle hole 3c of the connector 2, but when the spindle 3 is pushed down, the As shown in FIG. 3, the O-ring 11 comes off from the spindle hole 3c and the sealed state is released.

Next, the operation will be explained based on the embodiment shown in FIGS. 1 to 5.

First, as shown in FIG. 1, in the fully open position, the fully open position, and a specific position in between, the stopper pin 4 fixed to the spindle 3 is pushed up by the elastic force of the spring 5, and the cap is pushed up. The connector 2 cannot be rotated because the stopper pin 4 passes through the sliding groove 2d of the connector 2.

If you remove the handle from the handle attachment part 2a of the connector 2 in this state, you can prevent erroneous, careless, and mischievous operations. The valve shaft 7 is also fixed, and the opening degree of the valve does not change due to vibration or the action of fluid.

Next, the handle is attached to the handle attachment part 2a of the connector 2, and the spindle 3 protruding from the outer end of the connector is attached.
When one end 3a is pushed and the spindle 3 is pushed down against the elastic force of the spring 5, the stopper pin 4 fixed to the spindle 3 comes off the locking groove 6a and enters the rotation groove 6b, so this state The handle can be rotated to open, close, or open the valve in an intermediate position.

Then, when one end 3c of the spindle 3 is stopped being pushed down at full open, fully open, or a specific intermediate position, the spindle 3
is pushed up by the elastic force of the spring 5, the stopper pin 4 is fitted into the locking groove 6a and locked, the connector 2 becomes unable to rotate, and the valve is locked.

This manual operation locking device consists of a cap 6 and a cap 6.
A gasket is installed between the valve body 8 that fixes the valve, and gaskets 10 and 11 are installed between the cap 6 and the connector 2 and between the connector 2 and the spindle 3, so rainwater can be prevented even outdoors. It will not get into the cap 6.

Furthermore, the seal 11 installed between the connector 2 and the spindle 3 is in a sealing state when the spindle 3 is pushed up, and the sealing state is released when the spindle 3 is pushed down. does not compress the air inside the cap 6.

In addition, the locking groove 6a into which the stopper pin 4 is fitted and locked in the fully open and intermediate positions is shaped so that the stopper pin 4 can be easily removed from the locking groove 6a only when the connector 2 is rotated in the closing direction. It is easy to close the valve in emergencies.

Miyoshi summer staff member The effects of the present invention can be summarized as follows.

■The valve can be automatically locked at fully open, fully closed, and specific intermediate positions.

■Even if the handle is removed, it remains locked, and the opening degree will not change due to vibration or fluid action, and will not be subject to erroneous, careless, or mischievous operations.

■Unlocking and rotating are separate operations, making it easy to operate, even when the valve is installed sideways or downwards in relation to the piping.

■Since the structure is such that the lock is released by directly pushing the spindle in the axial direction, there is no need for a large push-down force due to increased friction between the spindle and the connector.

■When the spindle is pushed down, the air inside the cap is not compressed, so a large push-down force is not required.

■Rainwater will not enter the cap, rust will form inside the cap, making it difficult to operate, and incompressible water will not enter the cap, necessitating a large push-down force.

■The valve can be easily closed from fully open or from a specific intermediate position in an emergency.

■It has a simple structure, works reliably, and is relatively inexpensive.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing one embodiment of the locking device for manual operation of the present invention, FIG. 2 is an external view of FIG. 1, and FIG. FIG. FIG. 4 is a partially developed view of a cylindrical cross section taken along the line AB in FIG. 1, centered on the fine center of the valve stem, and FIG. 5 is a partially developed view similar to FIG. 4 of another embodiment. 6 is a vertical sectional view of a butterfly valve equipped with a conventional locking device for manual operation, FIG. 7 is a vertical sectional view of another locking device for manual operation, and FIG. 8 is a vertical sectional view of FIG. 2 is a partially exploded view of a cylindrical cross section centered on the thin center of the valve stem at -Y. 1...Lock device for manual operation 2...Connector 2
a...Outer end (handle attachment part) 2c...Axis hole 2d...Sliding groove 3.
...Spindle 3a...One end portion 3b...
・Ring groove 3c...Spindle hole 4...
Stopper pin 5... Spring 6... Cap 6a... Locking groove 6b... Rotation groove
7... Valve shaft 7a... Tip part
8...Body 9...Gasket 10.1
1...○Ring Patent Applicant: Kitazawa Valve Co., Ltd.Figure 2Figure 3Figure 5Figure 6Figure 7

Claims (5)

[Claims] (1) A locking device for manual operation of a valve such as a butterfly valve that opens and closes by rotating the valve shaft approximately 90 degrees or approximately 180 degrees, and the locking device for manual operation has a handle attachment portion on the outer periphery of the outer end. The formed connector is fixed coaxially to the tip of the valve shaft, a spindle is inserted into the shaft center hole formed in the connector so that one end protrudes from the outer end of the connector, and a spring is inserted between the spindle and the valve shaft. The stopper pin, which protrudes radially outward by passing through a sliding groove parallel to the axis of the connector, is fixed to the spindle, and the cap through which the connector passes is fixed to the valve body. The cap has a locking groove in which the spindle is pushed up by the elastic force of the spring and the stopper pin is fitted and locked when the valve is in the fully open and fully closed positions and, if necessary, in an intermediate position. A locking device for manual operation, characterized in that a rotation groove is formed in which the stopper pin can rotate in a range from a fully open position to a fully closed position when the stopper pin is pushed down against an elastic force. (2) A locking device for manual operation according to claim 1, further comprising a gasket installed between the cap and the body of the valve, and packing installed between the cap and the connector and between the connector and the spindle. (3) The manual operation lock according to claim 2, wherein the packing installed between the connector and the spindle seals when the spindle is pushed up, and the sealing state is released when the spindle is pushed down. Device. (4) The packing installed between the connector and the spindle is an O-ring installed in the O-ring groove formed in the spindle, and when the spindle is pushed up, the O-ring is attached to the inner peripheral surface of the spindle hole of the connector. 4. The locking device for manual operation according to claim 3, wherein the locking device is in a state in which the spindle is in a close sealing state, and when the spindle is pushed down, it comes off the inner circumferential surface of the spindle hole and the sealed state is released. (5) Claims 1 to 4 in which the locking groove into which the stopper pin is fitted and locked in the fully open and intermediate positions is shaped so that the stopper pin can be easily removed from the locking groove only when the connector is rotated in the closing direction. Locking device for manual operation as described.