JPS62278392A - Bellows type valve - Google Patents

Abstract

PURPOSE:To inhibit the torque of a valve stem from being transmitted to a bellows, by fixing to a valve cap or the bellows a cap fitting ring having a projection to be engaged with a groove formed on an upper outer peripheral surface of a valve member presser ring. CONSTITUTION:A valve member 7 is rotatably connected to a valve stem 6. A valve member presser ring 11 is formed at its upper outer peripheral surface with two straight grooves 18 extending in an axial direction of the presser ring. Further, a cap fitting ring 14 is detachably fixed to a valve cap 4 or an upper plate ring 23 of a bellows 10. The valve member presser ring 11 and the cap fitting ring 14 are located inside the bellows 10. When a handle 9 is rotated to rotate the valve stem 6 and vertically move the valve member 7, the two grooves 18 of the valve member presser ring 11 and two projections 21 of the cap fitting ring 14 act as a guide means for guiding the vertical movement of the valve member 7.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a valve G in which a valve body moves up and down, and particularly relates to a bellows type valve G that has improved performance against leakage to the outside of the valve. % [Prior Art] A conventional globe valve is shown in Fig. 7. A valve body 1 of the globe valve has an inlet 2 and an outlet 3 from both sides thereof, and is open on the upper side. The valve cover 4 is fixed to this upper opening via a gasket 5. A through hole is provided in the center of the valve cover 4, and a female thread is cut in a part of the hole.The valve body 6 passes through this through hole. The valve body 6 is rotatable and moves up and down by rotation.A valve body 7 is attached to the tip of the valve stem 6, and the valve stem 6 and the valve body 7 are not allowed to rotate. A valve seat 8 is located below the movable valve body 7 and is fixed around a communication hole that communicates the partition between the inlet and the outlet of the valve body 1 .

The valve rod 6 is fixed to a handle 9, and as the handle rotates, the valve body 6 also rotates and the valve body 7 moves up and down, opening and closing the valve. Here, in order to improve the leakage performance to the outside of the valve, a bellows 10 is installed between the outer periphery of the upper surface of the valve body 7 and the gasket 5 under the valve cover 4. The bellows 10 is made of a thin metal plate, has a substantially cylindrical shape, and has a corrugated outer peripheral surface. Therefore, even if the valve body 7 moves up and down, the bellows absorbs this movement, and the fluid within the valve does not leak from the gap between the sliding surfaces of the valve stem 6.

[Problem that the invention seeks to solve]

However, although this bellows 10 has a sufficient absorbing force against vertical movement of the valve body 7, it has a drawback that it is weak against rotational force. Therefore, in the conventional bellows type globe valve,
When the valve body 7 moves up and down due to the rotation of the valve body 6, the valve body 6
The rotational force is transmitted to the valve body 7 due to friction between the contact surfaces of the valve bodies 6 and 7, and the valve body 7 attempts to rotate. This rotation of the valve body 7 applies a torsional load to the bellows 10.
0 had a short lifespan. An object of the present invention is to prevent the rotational force of the valve stem 6 from being transmitted to the bellows 10. That is, it is an object of the present invention to provide a bellows type valve provided with a guide so that the valve body 7 moves only up and down.

[Means for solving problems]

The present invention is characterized by a valve box having an inlet at both ends, a communicating hole in the partition wall of the inlet and an open upper part, and a valve box fixed to the open part of the valve box and having a through hole in the center. A valve lid with a thread provided in a part of the through hole, a valve stem that penetrates the through hole of the valve lid and is screwed together, a valve body attached to the tip of the valve stem, and the valve body and the valve box lid. In a bellows type valve, the valve body has a through hole that fits into the valve body, and a bellows is provided around the valve stem, and the valve body moves up and down as the valve stem rotates to open and close the valve. The valve body retaining ring which is fixed to the valve body rotatably attaches the valve body to the valve stem, has a groove formed in the upper outer peripheral surface of this valve body retaining ring in its longitudinal direction, and has a protrusion that fits into the groove of this valve body retaining ring. The lid fitting ring is fixed to the valve lid or bellows.

〔Example〕

A longitudinal cross-sectional view of a bellows globe valve according to the invention is shown in FIG. The valve box 1 has flanges at both ends thereof for connection to pipes, and an inlet and an outlet are formed from these flanges to the center of the valve box.

The inlet 2 and the outlet 3 are separated by a horizontal partition wall, with the upper side being the outlet and the lower side being the inlet. A communication hole for communicating the inlet and outlet is provided in the horizontal part of the partition wall, and a ring-shaped valve seat width 8 is fixed around the communication hole. The upper central part of the valve box 1 is the outlet as described above, but this upper part is open, and the valve cover 4 is fixed to the open part of the valve box with a bolt and a bolt via a gasket 5.

A through hole for passing the valve body 6 is provided in the center of the valve lid 4, and a female thread is cut in a part of this through hole. The valve body 6 is passed through the through hole of the valve cover 4, a male thread is cut in the valve stem 6 at a position corresponding to the female thread of the through hole, and these are screw-jointed.

A handle 9 is attached to the upper end of the valve stem 6, the valve stem 6 and the handle 9 are fixed with a NAND, and the valve stem 6 is also rotated by rotating the handle.

This valve stem 6 has a partially male thread, and is threadedly connected to the female thread of the valve cover 4, so that the valve body 6 moves up and down by its rotation. A valve body 7 is rotatably attached to the lowermost end of the valve stem 6, and this attachment is performed as follows. That is, the valve body 7
A blind hole is made in the center of the top surface, and a female thread is cut at the top of this blind hole. Insert the valve stem 6 whose tip has an enlarged diameter into this blank hole, and fit the valve stem. Rotate freely and connect. This valve body retainer 11 has a thread cut on its outer periphery, and is screwed into the female thread of the blind hole in the center of the valve body. The rotation of the handle 9 moves the valve body 7 up and down to change the distance between the valve body 7 and the valve seat ring 8 fixed to the valve box 1, thereby opening and closing the bellows two-ball valve. A packing 12 is inserted between the inner wall of the central through-hole of the valve lid 4 and the outer peripheral surface of the valve body 6. The lower side of the packing 12 is supported by the step of the through-hole of the valve cover 4, and the upper side thereof is supported by a packing holder 13.
imposed by.

In order to further improve the sealing performance of the packing 12 between the valve cover 4 and the valve stem 6, a bellows 10 is installed around the valve body 6 and between the valve body 7 and the valve cover 4.

The bellows 10 is made of a thin metal plate and includes a substantially cylindrical bellows body with a corrugated outer peripheral surface and plate rings fixed to the top and bottom of the bellows body by welding or the like.

The lower plate ring is welded to the valve body 7, and the upper plate ring is sandwiched and sealed between the gasket 5 on the lower side of the valve lid 4 and the upper end of the valve box 1.

Here, in order not to transmit the rotational force of the valve body 6 to the bellows 10, that is, to prevent the valve body 7 from rotating, the following procedure is performed.

The valve body retaining ring 11 is shown in FIGS. 2 and 3. The valve body retaining ring 11 described above has a through hole 15 that loosely fits with the valve body 6, and a male thread 16 is cut at the lower part of the outer peripheral surface 17 of the valve body retaining ring so that the valve body 7 and Join and fix the valve body retaining ring and the valve body. The upper part of the outer peripheral surface 17 is larger than the outer diameter of the external thread 16 and smaller than the inner diameter of the bellows. Two straight grooves 18 are cut in the upper part of the outer peripheral surface in the axial direction, that is, the longitudinal direction of the valve body retaining ring.

On the other hand, in FIG. 1, a lid fitting ring 14 is detachably fixed to the valve lid 4 or to the upper plate ring 23 of the bellows 10. This lid fitting ring 14 is shown in Figures 4 and 5.
shows. The lid fitting ring 14 has a through hole 19 that loosely fits the valve stem 6, and has a thread 20 cut on its upper outer peripheral surface. This male screw 20 is a male screw for removably screwing into the valve cover 4 or the upper plate ring of the bellows 10,
A female thread is cut in the lower part of the central through hole of the valve cover 4, and these are screwed together. Alternatively, a female thread is cut on the inner circumferential surface of the plate-shaped ring 23 and screwed together. The intermediate portion of the lid fitting ring 14 has a circular outer circumferential surface having a larger diameter than the external diameter of the external thread of the lid fitting ring 14 described above. Furthermore, this lower part extends a part of the circular outer circumferential surface and has two projections 21 on the inner side whose inner dimensions are slightly larger than the inner diameter of the through hole 19. These two protrusions 21 fit into two grooves 18 on the outer peripheral surface of the valve body retainer 11. The valve body retaining ring 11 and the lid fitting 14 are located inside the bellows 10, and when the valve body 6 is rotated by rotating the handle 9 and the valve body 7 is moved up and down, the two valve body retaining rings 11 The two protrusions a18 and 14 serve as guides for vertical movement of the valve body 7.

In the embodiment described above, two protrusions were formed on the lid fitting 14, and two grooves were formed on the outer peripheral surface of the valve body retaining ring 11. It could be wood. Alternatively, a groove may be formed in the lid fitting ring 14 and a protrusion may be formed in the valve body retainer 11.

Furthermore, in addition to a combination of a projection and a groove, a combination of a projection and a recess may be used, such as a cylindrical bar-like projection and a circular hole.

Examples of other combinations include projections and projections together. An embodiment of these protrusions will be explained using FIG. 6.

FIG. 6 is a horizontal sectional view of the valve body retaining ring 11 and the lid fitting ring 14 combined. Protrusion 22 on valve body retainer 11
are formed in the upward direction, and 21 is a lid hook 14
There are two protrusions. The rotational force of the valve stem 6 is transmitted to the valve body retainer 11 by friction, but since the protrusions 21 and 22 are in plane contact at two places, the two protrusions 21 of the lid fitting 14 hold the valve body retainer 14. The two protrusions 22 do not rotate.

In the above, examples related to globe valves have been explained, but
The valve is not limited to a globe valve, but may be any other type of valve, such as a needle valve, as long as it is a bellows type valve in which the valve body moves up and down.

By doing so, no rotational force is transmitted to the valve body 7, and therefore no torsional load is applied to the bellows 10, resulting in an effect that the life of the bellows 10 is extended. Also, the guides provided for the valve body presser and lid fitting are inside the bellows, so it depends on the fluid used. There is no need to worry about corrosion etc.

〔effect〕

As explained above, in the bellows type valve according to the present invention, the valve body does not rotate. Therefore, there is an effect that no torsional load is applied to the bellows, and the life of the bellows is extended.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a bellows type globe valve showing an embodiment of the present invention, Fig. 2 is a front view of the valve body retaining ring in Fig. 1, and Fig. 3 is a sectional view taken along line A-A in Fig. 2. , FIG. 4 is a front view of the lid fitting shown in FIG. 1, FIG. 5 is a cross-sectional view taken along line BB in FIG. 4, and FIG. 6 is a cross-sectional view of the guide portion showing another embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a conventional bellows type globe valve. Figure 1 Figure 2 Figure 7

Claims (1)

[Scope of Claims] 1. A valve box having an inlet at both ends, a communication hole in the partition wall of the inlet and an open upper part, and a through hole in the center fixed to the open part of the valve box. A valve lid having a thread provided in a part of the through hole, a valve stem that penetrates the through hole of the valve lid and is screwed together, a valve body attached to the tip of the valve stem, and the valve body and the valve. A bellows-type valve consisting of a bellows provided around a valve stem between a box lid, and in which a valve body moves up and down as the valve stem rotates to open and close the valve, and has a through hole that fits into the valve stem. The valve body retaining ring which is fixed to the valve body rotatably attaches the valve body to the valve stem, and a groove is formed in the upper outer peripheral surface of this valve body retaining ring in its longitudinal direction, and the valve body retaining ring is fitted into the groove of the valve body retaining ring. A bellows type valve, characterized in that a lid fitting ring having a protrusion is fixed to the valve lid or bellows. 2. The bellows according to claim 1, wherein the valve body retaining ring has a protrusion formed in its upper part in the longitudinal direction, and the lid fitting ring has a groove that fits into the protrusion of the valve body retaining ring. Ceremony valve. 3. In claim 1, the valve body retaining ring has two protrusions each having a flat surface in its upper longitudinal direction;
The lid fitting ring has two protrusions each having a flat surface in the longitudinal direction at its lower part, and the two flat parts of the valve body retaining ring projection and the two flat parts of the lid fitting ring protrusion almost contact each other, so that the valve A bellows valve characterized in that a valve body retaining ring does not rotate due to a lid fitting ring fixed to the lid or bellows.