JP6672201B2 - Valve box structure - Google Patents

Description

  The present invention relates to the above-mentioned valve box structure such as a double leaf valve provided with a splittable valve box and an eccentric butterfly valve.

  Conventionally, a biplane valve has been used as an inlet valve of a water turbine in a hydroelectric power plant. The valve body of the double leaf valve is formed by connecting two flat plates in parallel with vertical ribs, and the loss coefficient of the valve body when the flow path is fully opened is small. Therefore, when used as an inlet valve of a water turbine, hydraulic power loss can be suppressed low.

  Among such biplane valves, particularly, those having a structure in which a valve box can be divided into two parts along a surface along the axial direction of a flow path, among those used for a large diameter and a head drop (Patent Document 1, FIG. 4) -FIG. 6 etc.). The division into two parts is for minimizing the loss factor of the valve body and for reducing the bulk during transportation.

  An example of the bi-leaf valve will be described with reference to FIGS. 1 and 2 showing an embodiment of the invention according to the present application. The valve box 1 is arranged so that the flow is orthogonal to the axial direction of the valve stem 6 having the eccentric valve element 5. The surface of the road S along the axial direction a is a dividing surface (hereinafter, referred to as a dividing surface 11), and is divided into two in the left-right direction. A groove 12 is formed in one of the split surfaces 11 of the valve box 1 into which the packing 10 for waterproofing the cut surface is fitted. After the gasket 10 is fitted into the groove 12, the split face 11 of the split valve box 1 is joined to assemble the valve box 1 to prevent water leakage from the portion where the split faces 11 are joined (the split portion of the valve box). .

  Further, as shown in FIG. 2, valves such as this type of bi-leaf valve V are interposed in various pipes P, and the connection thereof is generally made by fastening the mutual flanges 7a and 7b with bolts and nuts. . At that time, in order to prevent water leakage from the connection portion, a circular connection portion water stop packing 4 is interposed between the flanges 7a and 7b over the entire circumference.

JP 2013-210046 A

  The side surfaces of the circular connection portion waterproofing packing 4 and both end surfaces of the split surface waterproofing packing 10 need to be in contact with each other (see FIGS. 4 and 5 of the present application) to ensure waterproofness. For this reason, conventionally, as shown in FIG. 6, the contact surface (contact portion) b is formed as an integral member joined by an adhesive, or the connection portion waterproof packing 4 is formed as a semicircular pair. A T-shaped connecting gasket is interposed between the pair of semicircular connecting portion watertight packing 4 and the split surface watertight packing 10, and a flange end face of the T-shaped connecting gasket. Are bonded to the end surfaces of the water-stop packings 4 of the two connection portions, and the end surface of the web portion is bonded to the end surface of the split water-stop packing 10.

In order to incorporate the integrated packings 4 and 10 into the valve box 1, when assembling the valve box 1 into two parts, the packings 4 and 10 are assembled while fitting the packings 4 and 10 into the groove 12 of the split surface 11 and the groove 3 of the flange 7a. It will be.
If the packings 4 and 10 are damaged during the assembly, if water is leaked at the water stop section (packing interposed part) in the water pressure test after the assembly, or if the packing 4 is damaged during piping work, the packings 4 and 10 are set. They need to be fixed or replaced.
At this time, since the connection part waterproofing packing 4 and the split surface waterproofing packing 10 are integrated, the valve box 1 is disassembled and each packing 4, 10 is set again, or a new packing 4, 10 is replaced. It was necessary to incorporate and reassemble.
This reassembly is complicated, and the workability is reduced, resulting in a cost problem.

  An object of the present invention is to eliminate the necessity of reassembling (disassembling) the valve box 1 at the time of resetting or replacing the packings 4 and 10 under the above circumstances.

In order to achieve the above object, according to the present invention, the side surface of the packing for waterproofing the connection portion and both end surfaces of the packing for waterproofing the split surface are stopped by pressure contact.
In this way, if the water is stopped by abutting with pressure, only the inappropriate packing such as resetting is removed, so that resetting and replacement can be performed, thereby improving workability.

Specifically, a valve box that can be divided by a split surface along the axial direction of the flow path, a split surface water stopping groove formed on the split surface over the entire length in the axial direction, Flanges on both sides in the road direction, packing grooves for connecting water to other members such as piping formed over the entire surface of both flanges, and a split surface fitted in the split water sealing grooves. A valve box structure having a water stop packing and a connection part water stop packing fitted in the connection part water stop packing groove, wherein the connection part water stop packing and the split surface water stop packing are different from each other. consist a separable, both end surfaces of the side surface and the cut surface waterproof packing of the connection portion waterproofing gasket abuts with pressure, split that fits the abutment of the cut surface waterproof packing The part of the packing groove for surface water stop is the part of the contact surface Than it is adopted the configuration in which a portion of the same size of the sectional shape fitted to Kkin groove.
In this configuration, the “cross-sectional shape of the same size” does not need to be strictly a cross-sectional shape of the same size. The contact portions between the side surfaces of the water-stop packing and both end surfaces of the split water-stop packing press against each other with a large contact area to effectively stop water, and may be changed as long as the effects of the present invention can be exerted. It shall include the size and cross-sectional shape.

With such a configuration, the portion of the split surface water stop packing groove in which the contact portion of the split surface water stop packing is fitted is the cut surface water stop portion of the contact portion of the split surface water stop packing 10. The cross-sectional shape is the same size as the part fitted in the packing groove, so the abutting part of the split face waterproof packing fits perfectly into the split face waterproof packing groove, and the side of the connecting part waterproof packing Even if the both ends of the split water-stop packing are brought into contact with pressure, the abutted ends are unlikely to move in the groove. For this reason, the contact portions between the side surfaces of the connection portion waterproofing packing and both end surfaces of the split surface waterproofing packing have a large contact area and press-contact to effectively stop water.
At this time, the cross-sectional shape of both packings may be a round shape, a square shape, or the like. If the cross section is square, it can be manufactured by cutting from plate rubber and it can be inexpensive, and if the groove has a square cross section, the split surface waterproof packing fits perfectly into the groove, and the abutted end of the packing The movement of the part in the groove is more effectively suppressed.
Further, the split water-stop packing is provided with a protrusion protruding laterally inside the lengthwise direction of the abutting portion, and the protrusion is laterally branched from the split water-stop packing groove. When the groove is fitted in the groove, when the end face of the split surface waterproofing packing is pressed from the side surface of the connecting portion waterproofing packing, the contacted end thereof is more effectively prevented from moving in the groove.

  The present invention is configured as described above, and the side face of the seal for waterproofing of the connection part and both end faces of the seal for waterproofing of the split face are stopped by pressurized abutment. By removing only the inappropriate packing, the set can be reset or replaced, so that the workability is improved.

FIG. 1 is a front view of a left half cut of a biplane valve according to an embodiment of the present invention. II-II sectional view of FIG. Main part enlarged view of FIG. 3 is an enlarged view of a main part of FIG. 2, (a) is a left end portion, (b) is a right end portion Plan view of the packing for waterproofing the split surface of the same embodiment It is explanatory drawing of the packing for waterproofing of a connection part, and the packing for split surface waterproofing, (a) is a top view, (b) is a front view.

1 to 5 show a double leaf valve V according to one embodiment of the present invention. This double leaf valve V is also a valve which can be divided by split surfaces 11 along the axial direction a of the flow path S, similarly to the conventional one. A box 1, a split surface water stopping groove 12 formed in one of the split surfaces 11 over the entire length in the axial direction a, and flanges 7a, 7a on both sides of the valve box 1 in the axial direction a. The watertight packing groove 3 for connection with other members such as the pipe P formed over the entire surface of the flanges 7a, 7a (the left and right side surfaces in FIG. 2) and the watertight packing groove 12 for split surface waterstop. It has a split-surface water-stop packing 10 to be fitted, and a connection-port water-stop packing 4 fitted to the connection-port water-stop packing groove 3. The connection part waterproofing packing 4 and the split face waterproofing packing 10 are separate and can be separated. In the figure, 5 is a valve body, 6 is a valve shaft, and 8 is a valve seat. In this embodiment, although the valve body 5 and the valve shaft 6 are integrated, they can be separate members.

The inner diameter and the material of the valve box 1 are, for example, 3500 mm, SS400, and the like, and the sealing groove 3 for connecting part water blocking is, for example, a rectangular section having a depth of 6.8 mm and a width of 12.5 mm. The connection portion waterproof packing 4 fitted in the groove 3 is, for example, an O-ring having a circular cross section of 10 mm and made of nitrile rubber (NBR) or the like.
The dividing groove 12 has a square cross section, and the groove width is the same over the entire length, for example, 12.5 mm, and the depth is 6.8 mm. In the drawing, 12a and 12b are branch grooves branched from the groove 12 into which the following protruding portions 13a and branch portions 13b fit.

The split-surface water-stop packing 10 is made of, for example, nitrile rubber (NBR) and has a rectangular cross section over the entire length, for example, a width of 12.5 mm and a thickness (thickness in the front and back direction in FIG. 5): 8 mm. It has a shape in which the four corners of the cross section are chamfered, and the projection 13a at both ends and the branch 13b at one end are integrally formed (having), and the branch 13b also has the projection 13a. The tip of the branch portion 13b abuts on the valve seat 8 to seal (make the abutment surface watertight).
The width between the projections 13a and 13a is narrower than the projections 13a of the split surface water-stopping packing 10 with respect to the front part (contact portion) 10a. For example, the former 10a is 12.5 mm, The latter 10b is set to 10.5 mm. For this reason, when this packing 10 for waterproofing the cut surface is fitted in the packing groove 12 for waterproofing the split surface, both end portions (contact portions) 10a and 10a fit exactly into the groove 12, but between the two projections 13a, 13a. The portion 10b fits with a slight gap.

  When this packing 10 for water blocking is fitted into the packing groove 12 for water blocking, for example, the packing groove 12 has a depth of 6.8 mm and the packing 10 has a thickness of 8 mm. The crushing allowance is 1.2 (8-6.8) mm, and the packing 10 is fitted into the packing groove 12 with sufficient adhesion to stop water.

  Further, the lateral length (length in the left-right direction in FIG. 2) of the split surface water stop packing 10 is set shorter than the horizontal length of the split surface water stop packing groove 12. Therefore, when the packing 10 is fitted into the groove 12, a gap is formed at both ends of the groove 12. A part of the water-stop packing groove 3 for connecting portion is located (passes) in this gap. For this reason, when the packing 10 fits in the groove 12 and the packing 4 fits in the groove 3, as shown in FIG. 4, the side surfaces of the connecting portion waterproof packings 4 and the both end surfaces of the split surface waterproof packing 10 are formed. Abut

  In this state, when the divided valve box 1 is assembled with the split surfaces 11, 11, the side surfaces of the seal water seal 4 at the connecting portion and both end surfaces of the split water seal 10 come into contact with pressure. The part of the split surface water stop packing groove 12 in which the contact portion 10a of the split surface water stop packing 10 is fitted is the same as the part of the contact portion 10a fitted in the split surface water stop packing groove 12. The cross-sectional shapes have the same size (the packing 10 for split surface waterproofing fits perfectly into the packing groove 12 for split surface waterproofing).

The bi-leaf valve V of this embodiment has the above-described configuration. As in the conventional case, the split face water-stop packing 10 is fitted into the split face water-stop packing groove 12 of the split face 11, and then the half valve box 1 is cut. And the valve case 1 is assembled by fastening bolts and nuts. At this time, the valve body 5 and the like may be incorporated, and the packing 4 for waterproofing the connection portion may be fitted in the groove 3, but the fitting may be performed after assembly.
At the time of assembling the valve box 1, if the packing 10 needs to be reset, or if the packing needs to be replaced due to damage, the valve box 1 is disassembled to perform these operations.

When this valve V is interposed in various pipes P, the mutual flanges 7a and 7b are fastened by bolts and nuts as in the conventional case. At this time, the connection part waterproofing packing 4 is compressed by the fastening of the flanges 7a, 7b to seal (water blocking) between both flanges 7a, 7b, and the side surfaces of the connecting part water stopping packing 4, 4 are split. Both end surfaces of the surface waterproof packing 10 are brought into contact with pressure. The abutment is such that both ends 10a of the split surface water-stopping packing 10 fit into the grooves 12 and are prevented from moving in the length direction by the protrusions 13a, so that both ends 10a do not move in the grooves 12. In order to maintain the state with pressure, it exerts and maintains an effective water stopping effect.
At this time, if it is necessary to reset or replace the packing 4 due to improper fastening work of the flanges 7a and 7b, the connection between the valve V and the pipe P is released. Set the packing 4 again or replace it.

Although the above-described embodiment is a bi-leaf valve, the present invention is not limited to a bi-leaf valve (a bi-leaf type butterfly valve). It goes without saying that it can be done.
Further, the direction of the split surface 11 is not limited to the vertical direction, but may be any direction, such as the horizontal direction.
Thus, the embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Valve box
3 Packing groove for waterproofing of connection part 4 Packing for waterproofing of connecting part 5 Valve body 6 Valve shaft 7a Valve box side flange 7b Piping side flange 8 Valve seat 10 Split face waterproof seal 10a End of split face waterproof seal (Abutment part)
11 Split surface 12 Split surface water stop packing groove 13a Projection portion 13b of split surface water stop packing Same branch V Biplane valve S Flow path a Flow direction axial direction b Connection part water stop packing and split surface water stop Packing connection

Claims (2)

A valve box (1) that can be divided by a split surface (11) along the axial direction (a) of the flow path (S);
A split surface water-stop packing groove (12) formed over the entire length of the split surface (11) in the axial direction (a);
Flanges (7a) on both sides in the axial direction (a) of the valve box (1);
A sealing groove (3) for waterproofing the connection portion, which is formed over the entire surface of the two flanges (7a);
A split surface waterproof packing (10) fitted in the split surface waterproof packing groove (12);
A watertight gasket (4) for connection with another member such as a pipe (P) fitted in the watertight groove (3) for watertight connection;
A valve box structure having
The connecting part waterproofing packing (4) and the split face waterproofing packing (10) are separate and can be separated, and the side face of the connecting part waterproofing packing (4) and the split face waterproofing packing are provided. Both end faces of (10) abut against each other with pressure. The contact portion (10a) of the surface waterproof packing (10) has the same cross-sectional shape as the portion fitted in the split surface waterproof packing groove (12), and the split surface stop. The water packing (10) has a protrusion (13a) projecting laterally inside the longitudinal direction of the contact part (10a), and the protrusion (13a) is provided in the split surface water stopping groove. A valve box structure fitted in a lateral branch groove (12a) branched from (12).   2. The valve box structure according to claim 1, wherein an abutting portion (10 a) of the split surface water stopping packing (10) has a square cross section. 3.

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