JPS5813180Y2 - Valve with expansion joint - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a valve with an expansion joint.

Equipped with an expansion joint that allows the dimensions between the mounting surfaces of the valve to be changed as appropriate depending on the conditions of the location by fitting the joint pipe in a slidable manner to the outer circumference of the connecting cylinder provided in the valve box of the valve. As a valve, one shown in FIG. 4 is conventionally known (see Japanese Patent Laid-Open No. 5272931).

This valve has a joint pipe 33 fitted with a packing 32 on its inner circumferential surface slidably fitted to the outer periphery of a connecting cylinder 31 connected to a valve box 30, and a plurality of fittings screwed from the inner circumferential surface of the end of the cylinder 31. The stop bolt 34 is made to protrude from the outer peripheral surface of the cylinder 31,
The bolt 34 and the protrusion 35 forming the fitting groove of the packing 32 are configured to engage with each other to prevent the bolt 34 from coming off.

However, in the above-mentioned conventional valve with a joint, the effect of preventing the disconnection between the cylinder and the joint pipe is incomplete.

In other words, multiple bolts are used as locking members to stop the disconnection between the cylinder and the joint, and because these bolts are screwed into the cylinder's inner circumferential surface and protrude from the outer circumferential surface, the bolts are loosened by the vibration transmitted from the pipe. It easily loosens and eventually falls off, making it impossible to prevent it from being pulled out.

Therefore, in this invention, the protrusions provided on the outer circumference of the cylinder and the inner circumference of the joint pipe are engaged in the axial direction, and a detent member is placed in the gap between the protrusions to prevent the engagement portion from rotating in the circumferential direction. The technical problem is to ensure that it will not come out by inserting it in the axial direction.

The technical measures taken to solve the above technical problems are as follows.

That is, a plurality of protrusions are formed at regular intervals on the outer periphery of the end of a connecting cylinder that communicates with the valve box, and the gaps between the protrusions are formed on the inner periphery of the fitting part of the coupling pipe that is fitted onto the outer periphery of the cylinder. A plurality of protrusions that can pass in the direction and have an inner diameter smaller than the outer diameter of the protrusion and larger than the outer diameter of the cylinder are formed at regular intervals, and the protrusion of the joint pipe is inserted between the protrusions of the cylinder. After passing through the joint in the axial direction, the joint is rotated through the required angle, and with both protrusions arranged at the same position in the axial direction, a detent member is inserted into the axially common gap formed between each protrusion. One end of the seal assembly is inserted into the joint tube, and its axial movement is limited by having one end facing a step on the inner periphery of the joint pipe and the other end facing a part of the seal assembly pressed by a push ring.

The above technical means works as follows.

In other words, when the protrusion on the inner circumference of the joint pipe is passed through the gap between the protrusions on the outer circumference of the cylinder in the axial direction and the joint pipe is rotated by the required angle, both protrusions are arranged in the same position in the axial direction.
In this state, a detent member is inserted into the axially common gap formed between each protrusion.

Movement in the axial direction is restricted by having one end of this anti-rotation member provided at a stepped portion within the joint pipe and the other end facing a portion of the seal assembly pressed by the push ring.

Therefore, the joint pipe and the cylinder have the necessary axial movement allowance at their fitting parts, and even if a large pulling force is applied between them, the relative rotation between the joint and the cylinder is prevented by the anti-rotation member. As a result, the two protrusions are prevented from coming out of engagement in the axial direction, thereby reliably preventing the two protrusions from coming off.

This invention produces the following unique effects.

In other words, as long as the axial movement of the anti-rotation member is reliably restricted, the mutual axial arrangement of the protrusions will not collapse and their retention will be guaranteed, so the function of preventing the mating part from coming out is reliable. It is only necessary to check whether the push ring that restricts the movement of the detent member from the outside via the seal assembly is tightened.

In addition, the structure that prevents the cylinder and the joint pipe from being removed does not use threaded connection members such as bolts, but is prevented from being removed by engaging protrusions and anti-rotation members. There are no problems and it can be easily disassembled if necessary.

Next, an embodiment of this invention will be described based on FIGS. 1 to 3.

The embodiment shown in the drawings is for a butterfly or the like, in which a flange 3 is provided at one opening of the valve box 1 for forming piping, and a connecting cylinder 2 is integrally provided at the other opening.

A plurality of protrusions 4 are formed on the outer periphery of the end of the cylinder 2 at regular intervals.

A joint pipe 10 is inserted into the outer periphery of the end of the cylinder 2 .

The joint pipe 10 has a large diameter portion 11 that is inserted into the outer periphery of the end of the cylinder 2 with sufficient play, and has flanges 13 at both ends.
and 21.

Further, on the inner periphery of the large diameter portion 11, a plurality of protrusions 14 are formed at regular intervals so as to be able to pass through the gaps between the protrusions 4 in the axial direction.

The inner diameter of this protrusion 14 is smaller than the outer diameter of the protrusion 4,
Moreover, it is formed larger than the outer diameter of the cylinder 2 (see FIG. 3).

Therefore, when the joint tube 10 is pushed forward in the axial direction so that its protrusion 4 passes through the gap between the protrusions 14 of the cylinder 2, and the joint tube 10 is rotated by the required angle, the protrusions 4 and 14 will be aligned with each other as shown in FIG. They are arranged at the same position in the axial direction, and removal is prevented when they are secured in the axial direction.

In addition, in the above state, the gap between the protrusions 4 and the protrusion 14
Since the gaps therebetween are aligned in the axial direction, the detent member 15 is inserted into the common gap in the axial direction.

After inserting this anti-rotation member 15, the seal assembly consisting of the packing receiver member 9 and the packing 8 is inserted into the gap between the cylinder 2 and the joint pipe 100, the push ring I is brought into contact with the outside of the packing 8, and the 7 flange 12 and the flange 13 between the joints 10 are connected by bolts 17 and nuts 18.

In addition, since the member 9 and push ring I of the packing receiver are made of metal, if they were formed into an annular integral part, they would not hit the protrusion 4 when inserted into the cylinder 2, so they should be divided into multiple arc-shaped pieces. After it is fitted onto the outer periphery of the cylinder 2, it is assembled into an annular shape by means such as screwing and used.

Since the gasket 8 is an elastic body, it is not necessary to do this.

The detent member 15 has one end facing the packing member 9, which is part of the seal assembly, and the other end facing the stepped portion 24 provided on the inner surface of the joint 10 for movement in the axial direction. (see Figure 2).

In addition, in FIG. 1, 5 is a valve body, 6 is its driving device,
Reference numeral 16 in FIG. 2 denotes a plurality of ribs provided on the stepped portion 24, into which the tip of the detent member 15 is received.

Next, the operation of the apparatus of the above embodiment will be explained.

For example, when installing the butterfly valve as shown in the figure between the pipes 19 and 20 that are already connected, bolt 17 and nut 1
8 to release the pressure of the push ring 7 against the packing 8, and move the joint pipe 10 toward the valve box 1 side to adjust the dimension between the mounting surfaces, that is, the flange 3 of the valve box 1 and the flange at the outer end of the joint 10. After reducing the dimensions between 21 and 21, insert a butterfly valve between flanges 22 and 23 of pipes 19 and 20, then move the joint pipe 10 outward and attach flange 3 of valve box 1 to flange 22 of pipe 19. Bolted together through the joint packing, and between the joints 1
After bolting the flange 21 of 0 to the flange 23 of the pipe 20 via the joint gasket, bolt 17 and nut 1
Tighten 8.

Also, when removing the butterfly valve from the pipes 19 and 20, remove the bolts connecting the flanges 3 and 22 and the flanges 21 and 23, then loosen the pole H7 and the nut 18.
Loosen the tightening of the packing 8 by the push ring 7 and tighten the joint 10.
Move it to the valve box 1 side, reduce the dimension between the mounting surfaces, and remove it.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal side view showing an example of the device of this invention;
FIG. 2 is an enlarged longitudinal sectional side view of the essential parts of the same as above, FIG. 3 is a longitudinal sectional view taken along line A--A in FIG. 2, and FIG. 4 is a sectional view of a conventional example. 1... Valve box, 2... Cylinder, 4, 14.
...Protrusion, I...Press ring, 8...
・Packing, 10...Joint pipe, 12.13...
...Flange, 15... Rotation prevention member, 2
4...Dan section.

Claims (1)

[Scope of utility model registration request] A joint pipe is inserted into the outer periphery of the end of the cylinder that communicates with the valve box so as to be able to slide freely in the axial direction, and a seal assembly is inserted between one end of the joint pipe and the cylinder and pressed with a push ring. In a valve with an expansion joint that connects a ring and a joint pipe, a plurality of protrusions are formed on the outer periphery of the end of the cylinder at regular intervals, and the gaps between the protrusions are formed on the inner periphery of the fitting part of the joint pipe in the axial direction. A plurality of protrusions that can be passed through and have an inner diameter smaller than the outer diameter of the above-mentioned protrusions and larger than the outer diameter of the cylinder are formed at a certain interval, and the protrusions of the joint pipe are aligned between the protrusions of the cylinder. After passing in the direction, rotate the joint pipe by the required angle, and with both protrusions aligned at the same axial position, insert the detent member into the axially common gap formed between each protrusion. A valve with an expansion joint, characterized in that one end of the valve is opposed to a step on the inner periphery of the joint pipe, and the other end is opposed to a part of a seal assembly pressed by a push ring to restrict movement in the axial direction.