JPH0331877Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field: The present invention relates to an improvement of a gate valve equipped with a plate-shaped valve.

Prior art: Regarding gate valves that open and close internal flow passages by moving a plate-shaped valve (hereinafter referred to as a valve plate), for example, Japanese Patent Publication No. 38-6920, Japanese Patent Publication No. 18912-1987, It is also known from Utility Model Publication No. 51-29558.

This type of gate valve has a valve plate 3 which can be moved perpendicularly to the fluid passage hole 9 of the valve body 1, as illustrated in FIG.
On the other hand, a seal ring serving as a valve seat 10 is brought into contact with the valve seat 10 from both sides, and the structure is such that the movement of fluid is prevented together with the valve plate when the valve is closed. The seal ring serving as the valve seat 10 is functionally made of a material that is softer than the valve plate 3, and the contact surface pressure with the valve plate 3 can counteract the pressure of the fluid to be handled and prevent the movement of the fluid. The conditions are set accordingly. In order to set the contact pressure between the valve seat 10 and the valve plate 3, one piping connection flange is provided at one end of the valve body 1 from one side to which a seal ring that becomes the valve seat 10 is fitted. The sleeve-shaped sub-body 2 is inserted into the mounting hole 11 provided in the valve body 1 so that the center of the through-hole 9 coincides with the center of the fixed-side through-hole 9 that is integrated with the valve body 1.
The bolt 13 is fastened to the main body 1 via a mounting flange 21 provided at the intermediate portion of the outer periphery of the sub-main body 2, and this is done by adjusting the fastening force.

However, since the sub-body 2 is fixed to the valve body 1 at the flange 21 with the gasket 16 interposed, it is necessary to prevent leakage at this attachment point and to prevent contact between the valve seat and the valve plate. Since the pressure is maintained at an appropriate level at the same time by the mounting bolt 13, the seal ring 1, which is the valve seat,
Setting a contact pressure of 0 requires skill. Therefore, if the seal ring (valve seat) becomes worn due to long-term use or frequent opening and closing operations of the valve, it becomes difficult to set the contact pressure after replacing it. Of course, operations such as retightening were not possible due to the structure.

Problems to be solved: As described above, although the conventional plate valve type gate valve has a simplified structure and is a useful valve, there are problems in the details that cannot be solved structurally. Setting the contact pressure between the valve seat and valve plate, which was difficult,
To provide a more effective gate valve that can be accurately adjusted without changing the basic structure or requiring special techniques.

Means for solving the problem: The present invention is a gate valve with a plate valve structure in which a seal ring is arranged on the valve seat and the valve plate is sandwiched from both sides. An inner sloped ring made of an elastic flexible material is placed between the open end of the insertion hole and the inner base of the mounting flange of the sub-body, which has a valve seat made of one seal ring on the inner end. and a ring with an external slope that engages with the seal ring gasket, and a back-up spring that can apply an axial thrust to the seal ring gasket. A plurality of push bolts, which penetrate the main body mounting flange part and can be screwed in from the outside to be adjusted, are configured so that they are in contact with each other.

The seal ring gasket is made of a desired material depending on the fluid to be handled. For example, for high temperatures, a mixture of carbon fiber or the like is used in tetrafluoroethylene resin, and for relatively low temperatures, tetrafluoroethylene resin, neoprene, butyl rubber, etc. are used.

Effect: With this configuration, when the sub body is inserted into the mounting part of the valve body and installed, it is necessary to first set the contact pressure between the valve plate and the valve seat.
Tighten the nut to make the desired contact with the mounting bolt of the secondary body, and then tighten the push bolt to create a seal between the sleeve part of the secondary body and the insertion hole. By applying a thrust to the combined inner-sloping seal ring packing and the outer-sloping seal ring packing via the ring, both seal ring packings are strongly pressed against both the inner and outer circumferential surfaces to obtain a sealing effect. Therefore, wear on the valve seat can be corrected by retightening the mounting bolt.

Embodiment: Hereinafter, one embodiment of the valve of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to the most common type of plate valve type gate valve. 1
is the valve main body, 2 is the sub-main body, 3 is the valve plate, 3' is the opening provided in the valve plate, 4 is the valve stem, 5 is the connecting fitting for the valve plate,
6 is a bundle, 7 is a bottom cover, and 8 is a top cover. 10
10' is a fixed valve seat made of a seal ring of a laminated structure fitted into the valve body 1 side, and 10' is a movable valve seat made of a seal ring of a laminated structure fitted to the inner end of the sub-body 2. The sub body 2 is inserted into a mounting hole 11 provided on the side surface of the valve body 1 so that its center coincides with the center of the fluid passage hole 9 on the opposite side, and is equally planted on the mounting seat 12 on the side of the body 1. The mounting flange 21 is tightened and fixed using stud bolts 13 and nuts 13'.

As shown in FIG. 2, a seal ring receiving step 14 is formed at the opening end of the mounting hole 11 of the valve body 1 at the mounting portion of the sub-body 2 of the valve body 1, and a mounting flange of the sub-body 2 is formed at the opening end of the mounting hole 11 of the valve body 1. An annular groove 22 of a required width is also carved in the base of the inner surface of 21.

This annular groove 22 and the stepped portion 14 at the opening end of the mounting hole 11
The annular space formed by the outer peripheral surface of the sub-body 2 includes a seal ring packing 25 having a sloped surface on the inside, and a seal ring packing 25' having a slope on the outside that almost coincides with the sloped surface. are fitted in combination, and a back-up spring 26 with a flange is brought into contact with the back of the combined seal ring gaskets 25, 25'. Screw the push bolts 28 into the screw holes 27 drilled at multiple locations,
The tip of this push bolt 28 is arranged so as to come into contact with the back surface of the backup spring 26.

With this configuration, the contact state of the valve seats 10, 10' with the valve plate 3 can be maintained between the mounting flange 21 and the mounting seat 12 by inserting the sub-body 2 into the mounting hole 11 of the valve body 1. The tightening of the nut 13' to the stud bolt 13 can be set by adjusting the tightening amount at the same time as assembly. Therefore, when the need for additional tightening arises, adjustment can be made using this fastening portion.

To seal against fluid leakage at the assembly part of the valve body 1 and sub-body 2, by screwing in the push bolt 28 at the sub-body 2 mounting flange 21, an externally sloped seal ring is installed via the back-up spring 26. 25' is propelled, the seal ring 25 with the inner slope protrudes toward the outer circumferential direction, and conversely, the seal ring 25' with the outer slope is compressed inward, so that the circumferential surface of the stepped portion 14 on the main body 1 side and the sub-main body 2 are The seal rings 25, 25' are in strong contact with the outer peripheral surface of the insertion portion over the entire circumference, thereby enhancing the sealing effect. As a result, leakage at the fitting portion between the valve body 1 and the sub-body 2 is prevented, and separately from this, the valve seats 10, 1
The contact pressure between the valve plate 3 and the valve plate 3 can be adjusted as desired.

Effects of the invention: According to the invention, the contact state between the valve seat and the valve plate,
By making it possible to assemble and fasten the auxiliary body to the valve body separately, it is possible to make individual adjustments without mutual interference, and moreover, accurate measures can be taken with a simple configuration. The gate valve with this seed plate valve structure can now function more effectively.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the gate valve of the present invention, FIG. 2 is an enlarged sectional view of the main parts, and FIG. 3 is a diagram showing an example of a conventional gate valve. 1... Valve main body, 2... Sub body, 3... Valve plate,
9...Through hole, 10, 10'...Valve seat made of seal ring, 11...Sub-body mounting hole, 12...Mounting seat, 13...Stud bolt, 13'...Nut, 14...Step Part, 21... Mounting flange part, 22... Annular groove, 25, 25'... Seal ring, 26... Backup spring, 27... Threaded hole, 28... Push bolt.

Claims (1)

[Scope of utility model registration request] In a gate valve with a plate valve structure in which a seal ring is placed on the valve seat and the valve plate is sandwiched from both sides,
An internally sloped ring made of an elastic flexible material is engaged between the open end of the sub-body mounting hole provided on one side of the valve body and the inner base of the mounting flange of the sub-body. A seal ring gasket formed by combining a ring with an external slope, and a back-up spring of the seal ring gasket are installed inside,
A gate valve in which a plurality of push bolts which penetrate the flange part and can be screwed in from the outside and are adjusted are arranged in the attachment part of the sub-body so as to come into contact with the back-up spring.