JP2011226502A - Stop valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stop valve which leaves no space between the upper surface of a packing gland and the lower surface of a yoke sleeve even when the packing gland descends.SOLUTION: A valve shaft 12 is vertically movably attached to a shaft fitting part 8 of a valve cage, a packing 19 is interposed between the shaft fitting part 8 of the valve cage and a valve shaft 2, the packing gland 21 for pressing the packing 19 is arranged above the packing 19, a yoke sleeve 26 which is inserted into a yoke part 25 of the valve cage and is screwed into the valve shaft 12 is disposed above the packing gland 21 and a valve seat 4 in the valve cage 2 is opened and closed by a valve element 11 disposed on the lower end of the valve shaft 12 by rotating a handle 27 fitted into the yoke sleeve 26 and vertically moving the valve shaft 12. A protective tube 29 is disposed between the packing gland 21 around the valve shaft 12 and the yoke part 25 of the valve cage. A guide protruded part 25a with which the upper end inner circumference of the protective tube 29 is brought into contact is disposed on the lower surface of the yoke part 25 of the valve cage and, at the same time, a guide protruded part 21a with which the lower end inner circumference of the protective tube 29 is brought into contact is disposed on the upper surface of the packing gland 21.

Description

The present invention relates to an on-off valve that opens and closes a valve seat in a valve box with a valve body provided at the lower end of the valve shaft by moving the valve shaft up and down.

In an on-off valve for controlling the flow of high-pressure fluid or corrosive fluid, packing is interposed between the valve box shaft and valve shaft to prevent the fluid from leaking to the outside. . For example, in Patent Document 1, a packing presser that presses the packing via a packing presser ring is disposed above a packing that is interposed between the shaft mounting portion of the valve box and the valve shaft, and the valve presser is positioned above the packing presser. A yoke sleeve inserted into the yoke part of the box and screwed into the valve shaft is provided, and the valve box is provided at the lower end of the valve shaft by rotating the handle fitted in the yoke sleeve to move the valve shaft up and down. An on-off valve that opens and closes the valve seat is described.

Japanese Utility Model Publication No. 3-77880

In the above conventional on-off valve, if foreign matter such as dust, scale or rain water or salt water enters between the valve shaft, the yoke sleeve and the packing presser, the displacement resistance of the valve shaft increases, which prevents smooth vertical movement of the valve shaft. Or the valve shaft cannot move up and down. If there is no gap between the upper surface of the packing presser and the lower surface of the yoke sleeve, foreign matter can be prevented from entering between the valve shaft, the yoke sleeve, and the packing presser, but the sealability of the packing is reduced due to wear or deterioration. This is because when the packing presser is lowered and the packing is tightened further, a gap is formed between the upper surface of the packing presser and the lower surface of the yoke sleeve.

Therefore, the problem to be solved by the present invention is to provide an on-off valve that does not cause a gap between the upper surface of the packing presser and the lower surface of the yoke sleeve even when the packing presser is lowered.

In order to solve the above-described problems, in the on-off valve of the present invention, the valve shaft is mounted on the shaft mounting portion of the valve box so that the valve shaft can move up and down, and a packing is provided between the valve mounting shaft portion and the valve shaft. A packing presser that presses the packing is disposed above the packing; a yoke sleeve that is inserted into a yoke portion of a valve box and screwed into the valve shaft is provided above the packing presser; An on-off valve that opens and closes a valve seat in a valve box by a valve body provided at a lower end of the valve shaft by rotating a handle fitted in a sleeve to move the valve shaft up and down. A protective cylinder is provided between the packing presser and the yoke part of the valve box, and a guide convex part or a guide concave part that is in contact with the inner periphery of the upper end or the outer periphery of the upper part of the protective cylinder is provided on the lower surface of the yoke part of the valve box, Inner periphery of the lower end of the protective cylinder Rui is characterized in that the lower end outer periphery provided with abutting guide projection or guide recess on the upper surface of the packing gland.

According to the present invention, a protective cylinder is provided between the packing retainer around the valve shaft and the yoke part of the valve box, and the guide convex part or guide concave part with which the upper end inner periphery or the upper end outer periphery of the protective cylinder abuts is provided as the valve box yoke. Since the guide convex part or guide concave part with which the inner periphery of the lower end or the outer periphery of the lower end abuts is provided on the upper surface of the packing presser, it is protected even if the packing presser is lowered to retighten the packing. The cylinder can maintain a state in which the inner circumference of the upper end or the outer circumference of the upper end is in contact with the guide convex portion or guide concave portion of the yoke of the valve box, and the inner periphery or lower end outer periphery of the lower end is in contact with the guide convex portion or guide concave portion of the packing presser Thus, there is an effect that no gap is formed between the upper surface of the packing presser and the lower surface of the yoke sleeve.

It is sectional drawing of the on-off valve concerning embodiment of this invention. It is sectional drawing of the principal part of the on-off valve concerning another embodiment of this invention.

An embodiment of the present invention will be described with reference to FIG. FIG. 1 shows an example in which the on-off valve of the present invention is applied to a globe valve. A valve box 2 of the globe valve 1 has a fluid passage 3 therein, a substantially horizontal annular valve seat 4 formed at the center of the passage 3, and pipes (not shown) formed at both ends of the passage 3. It has the pipe connection parts 5 and 6, and the connection flange 7 formed in the upper end part. A connection flange 9 formed at the lower end of the shaft mounting portion 8 of the valve box is fastened to the connection flange 7 of the valve box 2 by a bolt 10.

A valve shaft 12 provided with a valve body 11 for opening and closing the valve seat 4 at the lower end is mounted on the shaft mounting portion 8 of the valve box so as to be movable up and down. The valve body 11 is fixed to the lower end of the valve shaft 12 by inserting the upper concave portion into the lower end of the valve shaft 12 and caulking the upper end of the concave portion. A metal bellows 13 is provided so as to surround the lower outer periphery of the valve shaft 12. The metal bellows 13 has a bellows ring 14 welded to the valve body 11 fixed to the lower end by welding, and a bellows flange 15 fixed to the upper end by welding. The bellows flange 15 is sandwiched between the valve box 2 and the shaft mounting portion 8 of the valve box through gaskets 16 and 17 on the outer periphery. A pin 18 is provided above the metal bellows 13 of the valve shaft 12 to inhibit the rotation of the valve shaft 12.

A packing 19 is interposed between the shaft mounting portion 8 of the valve box and the valve shaft 12, and a packing presser 21 that presses the packing 19 via a packing presser ring 20 is disposed above the packing 19. The packing 19 is compressed by fastening a packing retainer 21 with an eye bolt 23 and an eye bolt nut 24, one end of which is supported by the shaft mounting portion 8 of the valve box by an eye bolt pin 22.

A yoke sleeve 26 inserted into the yoke portion 25 of the valve box and screwed into the valve shaft 12 is provided above the packing retainer 21. A handle 27 is fitted into the upper portion of the yoke sleeve 26 and a cap nut 28 is fastened to couple the handle 27 to the valve shaft 12 integrally. The valve seat 4 is opened and closed by the valve body 11 by rotating the handle 27 and moving the valve shaft 12 up and down. By covering the upper end of the valve shaft 12 with the cap nut 28, foreign matter can be prevented from entering between the valve shaft 12 and the yoke sleeve 26 from the upper end side of the valve shaft 12.

A protective cylinder 29 is provided between the packing retainer 21 around the valve shaft 12 and the yoke portion 25 of the valve box. A guide convex portion 21a with which the inner periphery of the lower end of the protective cylinder 29 abuts is provided on the upper surface of the packing presser 21, and a guide convex portion 25a with which the inner periphery of the upper end of the protective cylinder 29 abuts is provided on the lower surface of the yoke portion 25 of the valve box. Even if the eyebolt nut 24 is screwed to tighten the packing 19 and the packing presser 21 is lowered, the inner periphery of the lower end of the protective cylinder 29 is in contact with the outer periphery of the guide protrusion 21a and the inner periphery of the upper end is the outer periphery of the guide protrusion 25a. Therefore, no gap is formed between the upper surface of the packing presser 21 and the lower surface of the yoke sleeve 26. Although the material of the protection cylinder 29 is not specifically limited, A metal, a synthetic resin, a synthetic rubber, etc. can be used. In addition, the protective cylinder 29 may have a shape having a cut in the longitudinal direction as long as foreign matter can be prevented from entering.

Another embodiment of the present invention will be described with reference to FIG. The members corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG.
In FIG. 2, a guide recess 21b with which the outer periphery of the lower end of the protective cylinder 29 abuts is provided on the upper surface of the packing retainer 21, and a guide recess 25b with which the outer periphery of the upper end of the protective cylinder 29 abuts is provided on the lower surface of the yoke 25 of the valve box. Even if the eyebolt nut 24 is screwed to tighten the packing 19 and the packing presser 21 is lowered, the outer periphery of the protective cylinder 29 contacts the inner periphery of the guide recess 21b and the outer periphery of the upper end contacts the inner periphery of the guide recess 25b. Since the contact state can be maintained, there is no gap between the upper surface of the packing retainer 21 and the lower surface of the yoke sleeve 26. Although the material of the protection cylinder 29 is not specifically limited, A metal, a synthetic resin, a synthetic rubber, etc. can be used. In addition, the protective cylinder 29 may have a shape having a cut in the longitudinal direction as long as foreign matter can be prevented from entering.

The operation of the globe valve is as follows. By rotating the handle 27 in a predetermined direction from the valve closing state shown in the figure to raise the valve shaft 12, the valve body 11 is separated from the valve seat 4 and the fluid passage 3 of the valve box 2 is opened, so that the fluid flows. It flows from the pipe connection part 5 side to the pipe connection part 6 side. When the handle 27 is rotated in the opposite direction to lower the valve shaft 12 to the position shown in the figure, the valve body 11 is seated on the valve seat 4 and the fluid passage 3 of the valve box 2 is closed, and the fluid flow Is cut off.

The present invention is not limited to the above-described globe valve, and can be used for all types of valves such as a gate valve, a needle valve, and a plug valve as long as the valve shaft is moved up and down to open and close the valve seat with a valve body. be able to.

DESCRIPTION OF SYMBOLS 1 Globe valve 2 Valve box 3 Passage 4 Valve seat 7 Connection flange 8 Valve box shaft part 11 Valve body 12 Valve shaft 13 Metal bellows 19 Packing 21 Packing presser 21a Guide convex part 21b Guide concave part 25 Valve box yoke part 25a Guide Convex part 25b Guide concave part 26 Yoke sleeve 27 Handle 28 Cap nut 29 Protective cylinder

Claims (1)

A valve shaft is mounted on the shaft mounting portion of the valve box so as to be movable up and down, a packing is interposed between the shaft mounting portion of the valve box and the valve shaft, and a packing presser that presses the packing above the packing. A yoke sleeve inserted into the yoke portion of the valve box and screwed into the valve shaft is provided above the packing presser, and the valve shaft is moved up and down by rotating a handle fitted in the yoke sleeve. In the open / close valve that opens and closes the valve seat in the valve box with a valve body provided at the lower end of the valve shaft, a protective cylinder is provided between the packing presser around the valve shaft and the yoke portion of the valve box. A guide convex portion or a guide concave portion that is provided on the lower surface of the yoke portion of the valve box and that is in contact with the lower end inner periphery or the lower end outer periphery of the protective tube. Or Off valve, characterized in that a de-recess on the upper surface of the packing gland.

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