JPH0442623Y2 - - Google Patents

Description

[Detailed explanation of the idea] "Industrial application field" This proposal concerns an emergency shutoff valve.

``Prior Art'' Conventional emergency trip valves require power to overcome closing resistance during emergency closing, are large in size, are difficult to close quickly and easily, and are difficult to close due to liquid leakage. However, there were defects that made it difficult to alleviate water hammer and make it difficult to reduce weight.

``Problems to be solved by the invention'' This invention aims to provide a lightweight emergency shutoff valve that is easy to open and close and can quickly and easily perform emergency closing and alleviate water hammer.

``Means for solving the problem'' This proposal provides a butterfly valve and its valve seat in the flow path of the valve case, a support arm on the pressure receiving surface of the valve, and a bearing provided on the arm parallel to the pressure receiving surface. The position of the support shaft is eccentric from the center of the pressure-receiving surface, and the eccentric side end of the bent ram that is loosely fitted to the support shaft and the driving sliding spindle perpendicular to the support shaft. one end is connected to the rod via a connecting rod, an abutment surface is provided between the eccentric end and the pressure receiving surface, and a child valve seat is provided on the outer periphery to face the child valve body provided at the other end of the rod. The emergency shutoff valve is formed by forming an opening in the butterfly valve.

"Action" Therefore, by sliding the spindle 11, the abutment surface 13
The butterfly valve 3 is held in parallel with the flow path 2 by pressing the butterfly valve 3 through the flow path 2, and this state is maintained at all times. To close the butterfly valve 3 in an emergency, slide the spindle 11 in the opposite direction to close the butterfly valve 3.
is tilted from the solid line position in FIG. further tilts to contact the valve seat 4 and close it. During the above-mentioned tilting operation, the bending lever 9 rotates as the spindle 11 rises, but since the tilting (rotation) speed of the butterfly valve 3 is faster than the rotation, the child valve body 14 and the child valve seat 15 are Therefore, the opening 16 remains open when the butterfly valve 3 is closed.
is tilted, allowing fluid to pass through the opening 16. When the butterfly valve 3 contacts the valve seat 4 and the flow path 2 is closed (FIG. 3), and the spindle 11 further rises, the lever 9 rotates around the support shaft 8 to move the child valve body 14 into the child valve seat. 15 to close the opening 16 and finish closing the flow path 2 (FIG. 1). And the above spindle 1
1 in the opposite direction to that described above, the flow path 2 can be opened (solid line in FIG. 4). Even when opening, the space between the child valve body 14 and the child valve seat 15 is first opened, and fluid passes through the opening 16 first, reducing rotational resistance.

"Example" A butterfly valve 3 is attached to a horizontal support shaft 8 in a flow path 2 of a valve case 1.
The valve seat 4 is provided at an angle on the inner circumferential surface of the flow path 2. Bearings 7, 7 are loosely fitted onto the support shaft 8, and the bearings 7, 7 and the pressure receiving surface 5 of the valve 3 are integrally connected by support arms 6, 6. The support shaft 8 and the pressure-receiving surface 5 are parallel, and the center line of the support shaft 8 is provided offset by an eccentric amount t from the parallel diameter passing through the center of the pressure-receiving surface 5 (Fig. 1). . A bent part of a bent ram 9 is loosely fitted into this eccentric horizontal support shaft 8, and the eccentric side end 10 of the ram 9 is connected to the lower end of a vertical drive sliding spindle 11 via a connecting rod 12. An abutment surface 13 between the end portion 10 and the pressure receiving surface 5 is provided to protrude from the pressure receiving surface 5. A child valve body 14 is vertically provided at the other end of the lever 9, and an arm 17 with the child valve body 14 protruding from the pressure receiving surface 5,
The butterfly valve 3 is provided with an opening 16 that is slidably supported on a support ring 18 provided at the butterfly valve 3 and has a child valve seat 15 facing the child valve body 14 on its outer periphery. The upper end of the spindle 11 is connected to a pin 2 to a piston 20 of a cylinder 19 provided outside the valve case 1.
The piston 20 is supported by the spring 2 provided in the lower chamber.
2 to supply pressure oil to the upper chamber, the piston 20 is lowered against the spring 22, the spindle 11 is lowered, and the pressure oil is removed.
The spindle 11 can be raised with a force of . By raising and lowering the spindle 11, the butterfly valve 3 can be closed and opened in an emergency manner as described above. In addition, what is indicated by 23 in the figure is the child valve body 1.
4 is a support pin, 24 is a long hole for supporting the same pin 23,
25 and 26 are connecting pins for the connecting rod 12, 27 is a support frame for the cylinder 19, and 28 is an oil supply hole.

``Effects'' Since the present invention is configured as described above, there is less resistance due to the fluid when the butterfly valve is closed in an emergency, and a portion of the fluid flows through the opening until the closure is completed, so there is less impact caused by the closing of the fluid, making it quick, easy, and safe. Not only can it be closed in an emergency, but even when it is opened, the opening opens first, so there is little resistance, and it does not require much power to open and close, which has the advantage of simplifying and reducing the weight of the device.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the emergency shutoff valve of the present invention in the closed state, Fig. 2 is a front view of the butterfly valve, Fig. 3 is a side view of the butterfly valve in its state before closing, and Fig. 4 is its open state. FIG. 1... Valve box, 2... Channel, 3... Butterfly valve, 4... Valve seat, 5... Pressure receiving surface, 6... Support arm,
7... Bearing, 8... Support shaft, 9... Bent lever, 10
... Eccentric side end, 11 ... Sliding spindle for driving, 12 ... Connection rod, 13 ... Abutment surface, 14 ... Child valve body, 15 ... Child valve seat, 16 ... Opening.

Claims (1)

[Scope of utility model registration request] A butterfly valve and its valve seat are provided in the flow path of the valve case, a support arm is provided on the pressure receiving surface of the valve, a bearing provided on the arm is loosely fitted to a support shaft parallel to the pressure receiving surface, and the support shaft is is eccentric from the center of the pressure-receiving surface, and the eccentric side end of the bent ram that is loosely fitted to the support shaft is connected to one end of the driving sliding spindle perpendicular to the support shaft through a connecting rod, and the above-mentioned The butterfly valve is formed with an opening provided with an abutment surface between the eccentric end and the pressure receiving surface, and a child valve seat on the outer periphery that faces the child valve body provided at the other end of the rod. Emergency shutoff valve.