JPH09178032A - Eccentric rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sure sealing when a valve is closed by providing a slope extended over the full closed rotational position of a handle in a locking groove engaged with a stopper in the full closed position of a valve body and locking the stopper in this slope. SOLUTION: A valve rod 20 is fixed to the upper part of a valve box 10 via sealing gaskets 21 and 51 and a handle 60 is fixed to the valve rod 20. A stopper 83 elastically pressured in the axial direction of the valve rod 20 is provided in the handle 60 and gear-like locking groove 70 engaged with the stopper 83 is provided around the axis of the valve box 20. A slope extended over the full closed rotational position of the handle 60 is provided in the locking groove 70 engaged with the stopper 83 in the full closed position of a valve body 30 and the stopper 83 is locked in the slope. Thus, sure sealing performance is provided while the valve is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve body fully closed position stopper mechanism of a handle suitable for an eccentric type rotary valve in which a valve rod is attached to a valve rod connecting hub on the back side of the valve body to eccentrically rotate the valve body. More specifically, the present invention relates to the one having improved sealing performance in the fully closed position.

[0002]

2. Description of the Related Art Conventionally, in a rotary valve of this type, for example, a manual lever device shown in FIG. 4 has been disclosed in Japanese Utility Model Publication No. 5-37107. This one has an operating lever 1 on the upper end of the valve rod.
5, a lock bar 25 which can move back and forth in parallel with the operation lever 15 is provided, and the lock bar 2 is provided at the rear end of the lock bar 25.
The lever 28 for retracting 5 is connected, an L-shaped lock plate 27 that engages with the opening plate 18 is attached to the tip of the lock bar 25, and the lock plate 27 is locked in the tooth groove 26 of the opening plate 18. This is a device for controlling the opening degree of the valve element 11.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Although it is excellent as the opening degree control device of No. 1, the tooth profile groove 26 of the opening plate 18 is loosened by the engagement with the lock plate 27 at the normally used opening position, especially in the fully open or fully closed position of the valve. However, there is a problem in that accurate positioning cannot be performed. This problem does not affect the sealability of the valve in the case where the valve body is always sealed in the valve box regardless of the movement of the valve body, such as a ball valve, but especially when the valve body is eccentrically rotated in the valve box. In an eccentric rotary valve in which a valve body is pressed against one valve seat surface in the valve box in the rotational direction to close the valve, there is a problem in sealing performance if there is play at the closed position of the valve body. This is because the valve body cannot completely seal the valve seat surface in the valve box if the closed position of the handle is displaced.

Further, the seal surface of the valve body or the valve seat may be worn during a long-term use, or the valve seat may be compressed by the valve body and the seal position of the valve body may be displaced due to the compression of the seal surface. In this case, there is a problem that the handle cannot be completely closed even if the handle is rotated at the regular seal position. An object of the present invention is to solve the above-mentioned problems and to provide an eccentric rotary valve having a good sealing property for surely closing the valve.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is to mount a valve rod on the upper portion of the valve box via a sealing member, and use a handle fixed to the valve rod to move the valve element in the valve box to the flow path of the valve box. A valve that opens and closes a flow path of a valve box by rotating about 90 degrees around an eccentric right-angled axis, wherein the handle is provided with a stopper for elastically pressing in the axial direction of the valve rod, and the stopper is provided around the valve rod axis. In a rotary valve in which a gear-shaped lock groove to be engaged is provided and the stopper is locked in the lock groove to rotationally position the handle, the handle is fully locked in the lock groove in which the stopper is locked at the fully closed position of the valve body. The eccentric rotary valve is characterized in that an inclined surface extending beyond the closed rotation position is provided, and the stopper is engaged with the inclined surface. In the above-mentioned stopper, the stopper is pivotally supported at the lower part of the handle with the curved portion of the V-shaped lever as a fulcrum, and a spring is provided between one end of the lever and the lower face of the handle and an adjusting bolt screwed to the handle is provided. By separating the lever from the lower surface, the other end of the lever can be elastically locked in the lock groove and positioned.

[0007]

The present invention has the above-mentioned structure, and when the stopper of the handle is locked in the lock groove at the fully closed position of the handle,
Since the lock groove at the fully closed position is provided with an inclined surface extending beyond the fully closed rotation position, the stopper of the handle is locked by the inclined surface in a resilient state. Since the stopper of the handle is elastically pressed against the inclined surface, the stopper is locked in a state in which a force is exerted to further rotate the handle in the closing direction along the inclined surface. Therefore, the valve body connected to the handlebar and the valve rod also comes into contact with the valve seat surface in the valve box in the closing rotation direction due to the elastic force to stop contact, and can be reliably sealed and closed with the valve seat surface. .

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an eccentric rotary valve showing an embodiment of the present invention, FIG. 2 is a view of a valve body showing an eccentric relationship between a valve box and a valve body, and FIG. 3 is a view showing a lock groove. In FIG. 1, the valve box 10
Is formed of a single casting that has an inflow passage 11 on the left side of one end and an outflow passage 12 on the right side of the other end, and has flange connection portions 15 and 16 at both ends. Insert 1 on the inflow channel 11 side
3 is screwed and the seat ring 14 is fixed to the center side of the valve box at the tip with the inner surface of the valve box. Valve box 10
Valve rod hole 17 for mounting the valve rod 20 and packing 21 on the upper part of the
Is provided to penetrate. The center of the valve stem hole 17 is shown in FIG.
As shown by (4), it is provided at a position S that is eccentric in the X and Y dimensions in the axial direction with respect to the center of the valve box. In addition, a support hole 18 is provided in the lower portion of the valve box 10 at a position eccentric from the center of the valve body concentric with the valve rod hole 17 in the upper portion, and supports a support shaft 22 that rotatably supports the valve body 30. It is inserted in the lower part of the hole 18 and the lower surface of the support hole 18 is hermetically closed with a lid 23.

As shown in FIG. 2, the valve element 30 is formed by integrally extending an upper support arm 32 and a lower support arm 33 on the back surface of a truncated spherical shell valve element 31 having a truncated spherical shell-shaped sealing spherical surface. The upper support arm 32 is provided with a through hole 34 at the rotation center S which is eccentric in the X and Y dimensions from the center of the spherical shell of the valve body. This through hole 3
Reference numeral 4 denotes a rectangular through-hole that is long in the axial direction and short in the direction perpendicular to the axis in a fully closed state where the valve body 30 is in contact with the seat ring 14.
A protrusion 24 having a rectangular cross section provided at the lower end of the valve rod 20 is fitted into and engaged with the through hole 34 to apply a rotational force to the valve body 30. The lower support arm 33 is provided with a through hole 35 at the center of rotation S which is concentric with the upper support arm 32.
Are rotatably supported by fitting.

The lower end of the valve rod 20 is engaged with the upper support arm 32 of the valve body, the upper collar 25 is fitted into the valve rod hole 17 in the upper portion of the valve box, and the packing 21 is attached to the upper surface of the collar 25. Then, it is mounted in a bonnet 50 fixed to the upper surface of the valve box. A double chamfered surface 26 and a male screw 27 are formed on the upper end of the valve rod to fix a handle 60.

The bonnet 50 is fixed to the upper surface of the valve box 10 by a bolt via a gasket, and the valve rod 20 is rotatably mounted inside. A packing 51 is attached to the inner surface of the upper end between the valve rod 20 and the packing retainer 5
2. A packing pressing nut 54 is screwed onto the male thread 27 of the valve rod via the disc spring 53. When the nut 54 is tightened, the distance between the flange 25 at the lower end of the valve stem and the nut 54 becomes smaller, so the lower packing 21 and the upper packing 51 are compressed, and the space between the valve stem hole 17 of the valve box and the valve stem 20 is compressed. And bonnet 5
0 and the valve rod 20 are hermetically sealed and the valve rod 20 is rotatably held.

A gear-shaped lock groove 70 shown in FIG. 3 is provided on the outer periphery of the flange portion 56 at the upper end of the bonnet. In the present embodiment, the valve body is rotated 90 degrees to be fully opened and fully closed.
Two sets of interlocking lock grooves 70 are provided so that the handle can be attached to the valve box in either direction of 180 degrees. The opening restricting flange 56 with the lock groove 70 may be provided on the upper end of the bonnet 50 separately from the bonnet and fixed to the bonnet 50 with bolts and nuts. In this case, the mounting position of the handle can be dealt with freely.

In FIG. 3, 71 is a lock groove when the valve body is fully opened, and 72 is a large number of lock grooves at an intermediate opening.
Reference numeral 73 is a lock groove when the valve body is fully closed. The lock groove 73 at the time of fully closing has an inclined surface 74 at a position 90 degrees from the lock groove 71 at the time of fully opening, and a stopper stopper 83 of a handle described later stops on this inclined surface 74. Therefore, the center of the fully closed lock groove 73 is located at a position beyond 90 degrees from the fully open lock groove 71, and a force pressing the inclined surface 74 is exerted on the stopper 83, so that the stopper 83 advances toward the inside of the inclined surface 74. As a result, the handle 60 is locked in a state in which a force for further rotating the handle 60 to the closing side is applied.

The handle 60 is provided with a packing holding nut 54.
Is engaged with the engaging portion 63 and the nuts 54 are tightened to properly compress the packings 21 and 51, and the handle engaging portion 63 is attached to the flat portion or the hexagonal diagonal portion of the packing holding nut 54. The nut 54, the handle 60, and the valve rod 20 are integrally engaged with each other so that the nut 54 does not loosen from the valve rod 20 even when the handle 60 is rotated and opened / closed. A V-shaped lever 80 is pivotally supported at a lower portion of the handle 60 at a fulcrum 81, a spring 82 is interposed between the handle 60 and the handle 60, and a stopper portion 83 at the other end is locked in the lock groove 70. To do. To open and close the valve, grasp the lever 80 to lock the stopper portion 83 into the lock groove 70.
The steering wheel is rotated after being released from.

Further, an adjusting bolt 84 is screwed on the handle 60 so as to abut against the lever 80. By engaging the adjusting bolt 84 with the lever 80,
The handle can be fixed at a fixed position for rotation. Further, by tightening the adjusting bolt at the valve body closed position of the handle, the contact pressure between the valve body 30 and the valve seat seat ring 14 can be increased, and reliable sealing can be performed when the valve is closed.

[0016]

As described above, the present invention is an excellent eccentric rotary valve capable of ensuring a reliable sealing property when the valve is closed.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an eccentric rotary valve showing an embodiment of the present invention.

FIG. 2 is a top view of a valve body showing an eccentric relationship between the valve box and the valve body.

FIG. 3 is a plan view showing an opening restriction flange at the upper end of the bonnet.

FIG. 4 is a perspective view showing a conventional handle stopper mechanism.

[Explanation of symbols]

10 valve box 14 seat ring 20 valve rod 21, 51 packing 26 double chamfer 27 male screw 30 valve body 32 upper support arm 33 lower support arm 50 bonnet 52 packing retainer 53 disc spring 54 packing retainer nut 56 opening regulation flange 60 Handle 70 Lock groove 71 Lock groove when fully opened 72 Lock groove at intermediate opening 73 Lock groove when fully closed 74 Sloping surface 80 Lever 81 Support point 82 Spring 83 Stopper section 84 Adjustment bolt

Claims (2)

[Claims] 1. A valve rod is mounted on the upper portion of the valve casing via a sealing member, and a valve body in the valve casing is rotated by a handle fixed to the valve rod at an angle of about 90 degrees around a right-angle axis eccentric to the flow passage of the valve casing. It is a valve that opens and closes the flow path of a valve box by rotating, and a stopper that elastically presses in the axial direction of the valve rod is provided on the handle, and a gear-shaped lock groove that engages with the stopper is provided around the valve rod axis. A rotary valve that locks the stopper in a lock groove to rotationally position the handle, wherein an inclined surface extending beyond the fully closed rotation position of the handle is provided in the lock groove in which the stopper is locked at the fully closed position of the valve body. Provided,
An eccentric rotary valve characterized in that a stopper is locked on this inclined surface. 2. The stopper is rotatably supported at a lower portion of the handle with a bent portion of a V-shaped lever as a fulcrum, and a spring is provided between one end of the lever and a lower surface of the handle and an adjusting bolt screwed to the handle is provided. The positioning is provided by elastically locking the other end of the lever in the lock groove by disengaging the lever from the lower surface of the handle.
Eccentric rotary valve described.