JPH0332849Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a trunnion-mounted ball valve equipped with a seat retainer, and the present invention relates to a trunnion-mounted ball valve equipped with a seat retainer. The present invention relates to an emergency sealing device for a ball valve that securely seals the position and between the seat retainer and the ball.

(Prior Art) Usually, in this type of device, as shown in Figs. 3 is attached, and this seal ring 3 is attached to a seal holder 5 via a flammable or fusible spacer 4.
The seal presser 5 is pressed against the ball 7 by the elastic force of the compression spring 6.

By the way, in the case of FIG. 1, the structure for incorporating the compression spring 6 described above is such that a plurality of holes are drilled in the body 2 (or the body cap), and the compression spring 6 is housed in the holes 8. ,
Further, in the case of FIG. 2, a spring holder 9 is formed separately, and the compression spring 6 is held by this holder 9.

However, in the former case, it is necessary to drill a hole in the body 2 to hold the spring, which is extremely troublesome work, requires time and effort, and is uneconomical. In this case, it is not necessary to drill holes in the body 2 as described above, but on the other hand, the spring holder 9 is formed separately in advance, and this holder 9 is installed inside the body 2 during assembly, and the spring holder 9 is compressed into this holder 9. Since the spring 6 is accommodated, the number of parts increases by the holder 9, and the assembly work becomes complicated.

Furthermore, in the former case, the hole 8 is located deep in the body 2, making it troublesome to attach and detach the compression spring 6 when assembling and disassembling the valve. In addition, the latter case has similar drawbacks, but in addition,
Seal ring 3, spacer 4, seal holder 5 and spring holder 9 are attached to the seat retainer in advance.
When the compression spring 6 is assembled and the compression spring 6 is also assembled to the body 1, the compression spring 6 tends to fall off from the holder 9, and sometimes even the holder 9 may fall off, making the assembly work very troublesome. It was hot.

(Problem to be solved by the invention) The present invention was devised in view of the above-mentioned circumstances, and the work of drilling holes for holding the spring in the body is extremely troublesome and requires time and effort. This method solves the conventional problem that providing a spring holder using an alternative method increases the number of parts, making it uneconomical and the assembly work complicated and troublesome. It is an object of the present invention to provide a ball valve having an emergency sealing device that is economical and easy to handle, which can achieve simplification.

Structure of the invention (means for solving the problem) The present invention attempts to solve the above-mentioned object by the following means.

That is, a ball having a through hole is rotatably provided in a valve body, a seat retainer is provided between the body and the ball, and a flammable or fusible resin such as a resin that is in sealing contact with the surface of the ball is placed in the seat retainer. A flammable or fusible sealing ring made of rubber or the like is attached to the contact position between the outer circumferential surface of the seat retainer and the inner circumferential surface of the body. In a ball valve that is equipped with a nonflammable and non-fusible seal ring made of expanded graphite or the like at the contact position on the circumference, an annular retainer gland is formed with a thick wall and a wide cross section, and on one side of this retainer gland, A protruding annular protrusion is formed to press the seal ring in case of an emergency, and a flammable or fusible spacer made of resin or the like is placed between one side of the retainer gland and the outer side of the seat retainer. On the other hand, on the other end surface of this retainer gland, a number of bottomed holes for holding compression springs are formed at annular positions, and a compression spring of the same diameter is inserted into each bottomed hole. One end of the compression spring is fixed to the reduced diameter part formed on the inner diameter of the tip of the bottomed hole to hold the compression spring in the bottomed hole, and the other end of the compression spring is in contact with the inner peripheral surface of the body. .

(Function) In the emergency sealing device of the ball valve of the present invention, in the event of an emergency such as a fire, a flammable or fusible sealing ring made of rubber or the like is attached to the contact position between the outer circumferential surface of the seat retainer and the inner circumferential surface of the body. If a flammable or fusible spacer such as resin is interposed between the seat retainer and the retainer gland, it will not be damaged by high heat. After the retainer gland is damaged, the retainer gland is inserted into a bottomed hole formed in the retainer gland and held by the elastic force of a compression spring installed between the body and the outer peripheral surface of the seat retainer. Since a non-heat and infusible seal ring made of expanded graphite or the like attached to the contact position of the inner circumferential surface of the body is pressed, the contact position between the inner circumferential surface of the body, the seat retainer, and the outer circumferential surface can be sealed.

Furthermore, in the ball valve emergency sealing device of the present invention, the compression spring is fixed at the reduced diameter part of the inner diameter of the tip so that the compression spring does not fall off. If it is inserted into the bottomed hole of the retainer gland in advance, it will not fall off, so it can be assembled to the seat retainer and assembled into the body together with the seat retainer, and the compression spring will not fall off during the assembly process.
Can be easily assembled.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 3 is a longitudinal cross-sectional view showing one embodiment of a ball valve having an emergency sealing device of the present invention, and FIG.
5 is a partial sectional view showing another embodiment of the ball valve having the emergency sealing device of the present invention, and FIG. 6 is the bottomed hole of the retainer gland shown in FIGS. 3 to 5. FIG. 7 is a partial right side view with the compression spring removed from FIG. 6. FIG.

In the figure, reference numeral 10 denotes the body of a ball valve, and a ball 1 having a through hole 12 at the center inside the body 10 through trunnion shafts 11, 11.
3 is attached rotatably. Reference numeral 14 denotes an annular seat retainer provided on both sides of the ball 13. On the ball 13 side of the seat retainer 14, there is a metal touch portion 15 that comes into sealing contact with the ball surface 13a to perform a sealing function in the event of an emergency such as a fire. Furthermore, an annular ball sheet 16 made of elastic, flammable or fusible material such as resin is attached to the ball 13 side of the seat retainer 14, and this ball sheet 16 is attached to the balls 13 on the upstream and downstream sides. Face 13
The sealing property is maintained by making contact with a.

17 is the outer peripheral surface of the seat retainer 14 and the body 1
A combustible or fusible sealing ring made of rubber or the like is attached to the contact position on the inner peripheral surface of the 0. In this example, an O-ring molded from rubber is used, and the sealing ring 17 made of this O-ring is connected to the seat retainer 14 and the body 10 in the normal state of the ball valve.
It functions to seal the contact surfaces of the

18 is the outer peripheral surface of the seat retainer 14 and the body 1
This seal ring 18 is a nonflammable and infusible material made of expanded graphite or the like, and is attached to a contact position on the inner circumferential surface of the seat retainer 14 and the body 10 to seal the contact surface between the seat retainer 14 and the body 10. It is for.

Reference numeral 19 denotes a retainer gland that presses the seat retainer 14 toward the ball 13. This annular retainer gland 19 is thick and has a wide cross section.
If an annular protrusion 19a is formed to protrude to press the seal ring 18 in an emergency, and a spacer 22 (described later) is installed, the retainer gland 1 can be removed after the spacer 22 is damaged in an emergency sealing situation such as a fire.
The annular protruding portion 19a of 9 presses the seal ring 18.

20 is a bottomed hole formed on the opposite side of the ball surface 13 of the retainer gland 19, and 21 is an elastic spring inserted into this bottomed hole 20, and the elastic spring 21 has the same diameter and is elastic. The retainer gland 19 is pushed by the force. The above bottomed hole 20
As shown in FIG. 6, the inner diameter of the tip of the hole is reduced so that the compression spring 21 is held by this reduced diameter portion 20a so as not to fall off.

Reference numeral 22 denotes a combustible or fusible spacer made of resin, etc., interposed between the retainer gland 19 and the seat retainer 14.

FIG. 5 shows another embodiment of the present invention. In this embodiment, the seal diameter of the seal ring 18 is made larger than the seal diameter of the seal ring (O-ring) 17, so that the seat retainer 14 can be secured in an emergency. This allows a piston effect to be obtained.

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

In the embodiments shown in FIGS. 3 to 7, in the event of an emergency such as a fire, combustible or fusible material such as rubber attached to the contact position between the outer circumferential surface of the seat retainer 14 and the inner circumferential surface of the body 10 Even if the sealing ring 17 of
After the retainer gland 19 is damaged due to high heat, the retainer gland 19 is inserted into the bottomed hole 20 formed by the retainer gland 19 and held there by the elastic force of the compression spring 21 installed between the retainer gland 19 and the body 10. The annular protrusion 19a of the retainer gland 19 presses the seal ring 18, which is made of nonflammable and non-fusible material such as expanded graphite, and which is attached to the contact position between the outer circumferential surface of the seat retainer 14 and the inner circumferential surface of the body 10. Therefore, the inner peripheral surface of the body 10 and the seat retainer 1
The contact position of the outer peripheral surface of No. 4 can be sealed.

Furthermore, in the emergency sealing device for a ball valve of the present invention, the compression spring 21 is attached to a retainer gland 19 having a reduced diameter portion 20a at the inner diameter of the tip, as shown in FIG. 6, to prevent the compression spring 21 from falling off. Since the compression spring 21 is inserted into the formed bottomed hole 20, when assembling the ball valve of the present invention, the compression spring 21
If the seat retainer 17 is inserted into the bottomed hole 20 of the retainer gland 19 in advance, it will not fall off.
The compression spring 21 is assembled into the body together with the seat retainer 14, and can be easily assembled without the compression spring 21 falling off during the assembly operation.

(Effects of the invention) The ball valve having the emergency sealing device of the invention has the following features by being configured and functioning as described above.
The following excellent effects can be obtained.

(1) There is no need for the extremely troublesome work of drilling holes in the body to hold the compression springs.

(2) There is no need to install a spring holder in place of the above hole, so the number of parts can be reduced.
It is extremely advantageous in terms of management and economy.

(3) There are useful effects such as being able to provide a ball valve having an economical emergency sealing device that is easy to handle during assembly work.

[Brief explanation of the drawing]

1 and 2 are partial sectional views showing a conventional example of a ball valve having an emergency sealing device, and FIG. 3 is a longitudinal sectional view showing an embodiment of a ball valve having an emergency sealing device of the present invention. 4 is a partial enlarged sectional view of FIG. 3, and FIG. 5 is a partial sectional view showing another embodiment of the ball valve having the emergency sealing device of the present invention.
Figure 6 is an enlarged cross-sectional view showing the details of the state in which the compression spring is inserted and held in the bottomed hole of the retainer gland shown in Figures 3 to 5, and Figure 7 is the portion of Figure 6 with the compression spring removed. It is a right side view. 10...Body, 12...Through hole, 13...Ball,
14...Seat retainer, 16...Ball seat, 1
7... Sealing ring, 18... Seal ring, 19... Retainer gland, 19a... Annular protrusion, 20... Bottomed hole, 20a... Reduced diameter part, 21... Compression spring, 22...
Spacer.

Claims (1)

[Scope of utility model registration request] A ball having a through hole is rotatably provided in the valve body, and a seat retainer is provided between the body and the ball, and a flammable or fusible material such as resin, which is in sealing contact with the surface of the ball, is attached to the seat retainer. A ball seat is installed, and a flammable or fusible sealing ring made of rubber or the like is attached to the contact position between the outer circumferential surface of the seat retainer and the inner circumferential surface of the body. In a ball valve equipped with a nonflammable and non-fusible seal ring made of expanded graphite or the like at the contact position, an annular retainer gland is formed with a thick wall and a wide cross section, and one side of this retainer gland is equipped with a A protruding annular protrusion is formed to press the seal ring, and a flammable or fusible spacer made of resin or the like is interposed between one side of the retainer gland and the outer side of the seat retainer. On the other hand, on the other side of this retainer gland, a number of bottomed holes for holding compression springs are formed at annular positions, and a compression spring of the same diameter is inserted into each bottomed hole, and this compression spring is A compression spring is held in the bottomed hole by fixing one end to a reduced diameter part formed on the inner diameter of the tip of the bottomed hole, and the other end of the compression spring is brought into contact with the inner peripheral surface of the body. Emergency sealing device for ball valves.