JPS5922381Y2 - Flow path on/off valve - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a flow path opening/closing valve having a high degree of airtightness.

Conventional flow path opening/closing valves are configured to prevent fluid leakage using a sealing member such as a backing, so fluid may leak if the sealing member loosens or breaks due to aging or the like.

Therefore, it is extremely dangerous to use such a flow path opening/closing valve in a piping system for harmful substances discharged from the chemical industry or the atomic crab industry.

Therefore, in this type of case, a flow path opening/closing valve using a metal bellows with extremely low leakage is used, but foreign matter mixed in the fluid may enter the bellows part and damage the bellows, causing the fluid to leak. It has drawbacks such as the possibility of

In addition, when installing the on-off valve, conventionally the tightening nut had to be inserted after removing the structural members, which made it desirable to make the work of installing and removing the on-off valve more efficient. was.

The present invention aims to eliminate such drawbacks by inserting a movable rod having a valve body into the opening of a valve box forming a flow path with a slight gap, thereby removing foreign matter in the fluid. This provides a highly reliable flow path opening/closing valve that prevents water from entering the bellows portion.

To provide a flow path opening/closing valve having a structure that further prevents leakage by providing a sealing member between the operating rod and the pipe body and crimping it with a gland nut to cover the operating rod with the sealing member and having a high degree of airtightness.

Furthermore, the purpose is to improve the efficiency of attaching and detaching the on-off valve itself.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 10 denotes a valve box that communicates with a fluid piping system, and this valve box 10 is formed with a valve seat 10a and flow passages 11a and llb that are connected to the piping, respectively.

The valve box 10 also has an opening 1 facing the valve seat 10a and communicating with the flow passages 11a and 11b.
1C is provided.

A movable rod 13 having a valve body 12 at its tip for sealing the valve seat 10a of the valve box 10 is inserted into the opening 11C.

The valve body 12 is made of a hard material such as Stellite, and has a hardness difference between it and the valve seat 10a to improve familiarity between the two and prevent leakage due to wear of the valve body 12.

In addition, the outer surface of the moving rod 13 and the inner surface of the opening 11C are in close contact with each other, that is, with a small gap a, in order to prevent foreign matter from entering the fluid flowing from the flow path 11a or 11b. It is located.

Further, one end of a cylindrical metal bellows 14 is attached to a portion of the movable rod 13 that protrudes outside the valve box 10.

The bellows 14 is arranged to cover the movable rod 13 facing away from the valve box 10, and its other end is attached to an annular member 15 that fits loosely into the movable rod 13.

This annular member 15 is integrally fixed to a cylindrical body 16 arranged to cover the bellows 14.

An annular flange portion 17 is formed at the end of the cylindrical body 16 on the valve box 10 side.

Seal members, such as O-rings 18 and 18, are arranged at the portion of the collar 17 that contacts the valve body 10 and on the opposite side thereof, respectively.

The flange portion 17 is held between the valve body 10 and the pipe body 20 via O-rings 18 and 18.

This pipe body 20 covers the cylinder body 16 and further covers the valve box 1.
The threaded portion 21 and the second threaded portion 21 and 22 are provided on the outer surface of both ends thereof, respectively.

A cap nut 23 is screwed into the first threaded part 21 on the side of the flange part 17 of this threaded part, and by tightening this nut 23, the pipe body 20, the cylinder body 16, and the valve box 10 are
The respective contact portions are completely sealed and integrally connected by O-rings 18, 18.

Further, an end of the movable rod 13 opposite to the valve box 10 is connected to one end of an operating rod 24 inserted into the pipe body 20.

That is, the moving rod 13 is inserted into the recess 25 formed in the operating rod 24 via the pole 26, and the pin 27.2 is inserted into the recess 25 formed in the operating rod 24.
7 in the axial direction.

The operating rod 24 is screwably attached to the tubular body 20, and a handle 28 is attached to the other end.

Also, between the opposing surfaces of the operating rod 24 and the tube body 20, there are a plurality of sheet backings 30, 30, spacers 31, etc.
, 31 . . . and a backing 32 are arranged in the axial direction.

These seal members are connected to the second threaded portion 22 of the tube body 20.
is crimped by a locking nut 33 and a gland nut 34.

The root diameter B of the first threaded portion 21 of the tubular body 20 is larger than the outer diameter A of the gland nut 34.

This is the case when the flow path opening/closing valve is installed on the mounting plate 35 as shown by the two-dot chain line in the figure. This is to facilitate the installation of the tightening nut 36.

Note that 37 is a hole for filling helium or the like during a leakage test.

The flow path 11a of the valve box 10 is configured in this way.

11b are respectively connected to the piping of the fluid to be controlled, and the handle 28 is rotated to open and close the piping system.

That is, by rotating this handle 28, the operating rod 24 is screwed and the movable rod 13 is moved up and down.

Therefore, the valve body 12 attached to the tip of the movable rod 13
is in close contact with or separated from the valve seat 10a of the valve box 10 to open and close the flow passages 11a and 11b.

For example, if the merging fluid is flowing from the flow path 11a side to the flow path 11b side, the fluid enters from the flow path 11a and flows out to the flow path 11b side via the valve seat 10a.

At this time, the fluid flows through the small gap a between the moving rod 13 and the opening 11C to the outer surface of the bellows 14.

However, the gap a completely prevents foreign substances mixed in the fluid from entering the bellows 14 side.

Therefore, the bellows 14 will not be damaged by foreign matter.

Furthermore, even if fluid leaks from the bellows 14 or other joints for other reasons, the O-ring 18
Alternatively, the sheet backing 30° 30..., the spacers 31, 31..., the backing 32, etc. prevent leakage to the outside.

In addition, when mounting on the mounting plate 35, the threaded portion 22 of the tube body 20 is configured to have a smaller diameter than the threaded portion 21, and the root diameter of the first threaded portion is made larger than the outer diameter of the gland nut. Therefore, after removing the handle 28, the tightening nut 36 screwed into the threaded portion 21 can be easily removed.

Therefore, the mounting plate 35 can be completely mounted by locking the cap nut 23 and then tightening the nut 36.

In addition, according to the conventional example, the consideration that B>A as in the present invention is not taken into consideration for the eagle portions 21 and 22 of the tube body 20, and the tightening nut 36 is not installed until the gland nut 34, locking nut 33, etc. are removed. It has a removable structure.

If work is performed to remove the oak (34.33) that fixes the sealing members such as the seat backing 30 in this way, it will be necessary to perform a leakage test again, making the work extremely difficult, and furthermore, the installation location The company was burdened with the hassle of carrying leakage testing equipment every time it was changed.

On the other hand, according to the present invention, the handle 28 and the tightening nut 3
This can be done by simply removing 6, ie, without touching the seal portion or the like.

Further, in the present invention, the fluid flowing in from the opening 11C is sealed on the outside of the bellows 14, but there is a conventional example in which the fluid flowing in from the opening 11C is sealed on the inside of the bellows.

In this case, the bellows may be biased and damaged, and the present invention has been designed with this point fully taken into consideration.

Since the present invention is constructed in this manner, it is possible to completely prevent damage to the bellows due to the intrusion of foreign matter mixed into the fluid.Also, even if the bellows is damaged by any chance, a sealing member is provided to prevent the fluid from leaking. No more leakage.

Furthermore, since the diameter of the first threaded portion to which the tightening nut is attached is made larger than the outer diameter of the gland nut, the on-off valve can be easily attached and detached.

Therefore, maintenance and inspection and installation work are easy, and reliability is extremely high.

[Brief explanation of the drawing]

The figure is a sectional view for explaining one embodiment of the present invention.
is a valve box, 10a is a valve seat, 11a and 11b are flow passages, 11C is an opening, 12 is a valve body, 13 is a moving rod, 1
4 is a bellows, 16 is a cylinder, 18.18 is an O-ring,
20 is a tube body, 21.22 is a threaded portion, 24 is an operating rod, 28
is a handle, 30, 30... is a seat backing, 32.
32 is a backing, 34 is a gland nut, and 36 is a tightening nut.

Claims (1)

[Scope of utility model registration request] A valve box that forms a flow passage communicating with a fluid piping system and has a valve seat, and is inserted with a slight gap between the inner surface of an opening formed opposite to the valve seat of the valve box, A movable rod is attached with a valve body that is in close contact with the valve seat to open and close the flow passage, and one end of the movable rod is attached to a portion of the movable rod that protrudes outside the valve box. a bellows covering the side;
The other end of the bellows is attached to a cylindrical body that covers the bellows in the axial direction.
a tube body having a threaded portion and a second screw portion on the opposite outer surface; a tube body that is screwably inserted and attached to the tube body, one end of which is connected to the movable rod and extends outside the tube body; An operating rod having a handle attached to the other end, a sealing member inserted between the outer surface of the operating rod and the inner surface of the tube body, and the second threaded portion are attached, and the outer diameter thereof is the same as that of the first screw. a gland nut which is formed to have a smaller diameter than the root diameter of the threaded portion and which presses the sealing member onto the tubular body and extends the operating rod outside the tubular body; and a gland nut which is attached to the first threaded portion and which arranges the tubular body. A flow path opening/closing valve characterized by comprising a tightening nut for attaching the valve.