JPH04136570A - Assembling method of rotary type valve - Google Patents

Abstract

PURPOSE:To make it simple and easy to assemble gland members in a gland hole by inserting the outer end side of a valve shaft into the gland hole from the opposite side of a sealing structure for assembling a drive system after inserting the gland members into the gland hole of an upper lid. CONSTITUTION:A valve shaft 6 and valve plug 21 are joined in a body by welding beforehand. A spring washer 32, packing 31, packing 33a, gland follower 35, packing 33b, and retainer 18 are fittingly inserted into the gland hole 15 of a upper lid 13 from the upside, and a guide bushing 37 and O-ring 36 are fittingly inserted into a center hole 28 from the downside beforehand. The upper end section of the valve shaft 6 is inserted into the upper lid 13, which a gland member 30 is built in, through a thrust ring 46 from the opposite side of the sealing structure, that is, from the side of a lower end opening. Because gland members are thus secured before the valve shaft is inserted into the gland hole of the upper lid, gland member securing work can easily be conducted.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a method of assembling a rotary valve.

[Prior Art] For example, for valves used to control cold and hot media for air conditioning, conditions such as pressure, temperature, corrosion, etc. are limited to relatively narrow and not very strict ranges. A rotary valve is known as one that satisfies the following conditions and is especially suitable for mass production.

This type of rotary valve includes a valve plug having a spherical layer Jfi, and is generally constructed as shown in FIG. That is, the rotary valve 1 includes a spherical valve plug 4 having a through hole 5 in the flow path 3 of the valve body 2, and the valve plug 4 is connected to a valve shaft 6 perpendicular to the center line of the valve body 2.
By rotating the flow path 3, the flow path 3 is opened and closed, and the flow rate is controlled according to the rotation angle.

The outer peripheral surface of the valve plug 4 is a spherical surface whose spherical center coincides with the center of the plug, and is brought into close contact with the seating surface 8 of the seat ring 7 installed on the upstream side of the flow path 3, thereby forming the spherical seating portion 4.
It forms A. Further, on the upper and lower surfaces of the valve plug 4, a lower end corner head of the valve shaft 6 and a stud 9 provided in the valve body 2 are provided.
Fitting holes 10 and 11 are formed into which the upper end portions of the two fit, respectively.

The valve shaft 6 forms the drive system of the rotary valve 1 together with the valve plug 4, and is inserted through the gland member 16 into the gland hole 15 of the upper M13 which is fitted and fixed to the upper opening 12 of the valve body 2. , its upper end protrudes above the upper lid 13.

In this case, the rotary valve 1 is assembled according to the following procedure.

■Install the valve body 2 on the assembly stand.

■Place the stud 9 inside the valve body 2.

(2) Insert the valve plug 4 into the valve body 2 and fit the fitting hole 11 into the upper end of the stud 9.

(2) Fit the lower end of the valve stem 6 into the 1° fitting hole of the valve plug 4.

(2) Fit the upper cover 13 into the upper opening 12 of the valve body 2 and insert the valve shaft 6 into the gland hole 15.

■Gland member 16 is placed in the gap between the gland hole 15 and the valve stem 6.
, the retainer 18 and the like are fitted and inserted to seal the ground hole 15.

■Fit the seat ring 7 into the upstream opening 19 of the valve body 2, bring its seating surface 8 into close contact with the spherical seating part 4A of the valve plug 4, and then attach the retainer 17 to one upstream opening. Screw and fix.

After this, the drive section is assembled to the upper end of the valve shaft 6.

[Problems to be Solved by the Invention] Incidentally, although the method for assembling such a conventional rotary valve l is as described above, it is particularly difficult to assemble a narrow gap between the valve shaft 6 fitted into the upper cover 13 and the gland hole 15. The work of inserting the gland member 16 into the shaft is extremely troublesome and the work efficiency is poor because the gland member 16 needs to satisfy both objectives of shaft movability and liquid sealing property.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to facilitate the work of inserting the gland member into the gland hole and improve the workability of assembly. An object of the present invention is to provide a method for assembling a rotary valve.

[Means for Solving the Problems] In order to achieve the above object, the present invention firmly attaches a valve plug having a spherical seating portion on its peripheral surface coaxially to one end of the valve shaft, and a tapered surface of the valve shaft. The drive system is assembled by inserting the other end of the seal structure into the ground hole of the upper cover from the opposite side of the seal structure in which the ground member is attached in advance.

[Function] In the present invention, the gland member is installed before inserting the valve stem into the gland hole of the upper cover, so that the work of installing the gland member is facilitated.

``Example'' The present invention will be explained in detail below based on an example shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a rotary valve assembled by the method of the present invention, and FIG. 2 is a perspective view of a valve plug and a valve shaft. In the figure, the same components as in FIG. 8 are designated by the same reference numerals.

First, the structure of the rotary valve will be explained based on FIG. 1 and FIG. 2. In these figures, the rotary valve 20 includes a valve plug 21 attached to the inner end of the valve stem 6 and disposed within the valve body 2.

The valve plug 21 is composed of a valve body 22 made of a substantially hemispherical shell structure with a hollowed out inside, and cylindrical bearing portions 23 and 24 integrally provided on the upper and lower surfaces of the valve body 22, respectively. A long band-shaped spherical seat 25 is formed protrudingly on the outer peripheral surface of the valve body 22 in the direction of rotation of the valve shaft 6, and an opening 26 forming an equal percentage characteristic portion overlaps one end of the spherical seat 25. The width of the 0-spherical seating portion 25 is equal to the inner diameter A of the seating surface 8 of the seat ring 7.
It is set slightly larger than (D>A).

The inner part of the valve shaft 6 @6a is fitted into the upper bearing part 23 and integrally joined by welding or the like, and the lower bearing part 24 is connected to the upper end of the stud 9 provided on the inner surface of the valve body 2. Rotatably fitted and supported on the shaft. The outer end 6b of the valve shaft 6 is
It passes through the ground hole 15 of the lid 13 that closes the upper opening 12 of the valve body 2 and projects to the outside.

The outer end of the valve stem 6 is provided with a tapered surface 6A and a square head 6B to which a drive unit such as a handle is attached.

The ground hole 15 is formed by making the upper half of the center hole 28 provided in the upper lid 13 into a large diameter hole 15, and a ground member 30 is provided in the gap between this hole and the valve shaft 6. It is fitted.

In this case, in this embodiment, the gland member 30 includes a packing 31, a spring washer 32, a backing (a yarn-shaped molded packing) 33a, 33b, and an O-ring 3.
4. A ground follower 35 and a retainer 18 (a metal ring for maintaining the shape of the packing 33) are used. However, the gland member 30 is not limited to the above-mentioned members, but may be any gland member that satisfies both the movability of the valve stem 6 and the liquid sealing property of the gland hole 15, and the types thereof may be increased or decreased. Of course you can get it.

On the other hand, an O-ring 36 and a guide bush 37 are fitted into the center hole 28 of the upper lid 13. The guide bushing 37 is made of a lining material made of fluororesin as a base material combined with carbon or the like, and is made by lining the inside of a stainless steel perforated plate.

The stud 9 is formed in a cylindrical shape, and a flange 9a is integrally protruded from the middle part of the outer peripheral surface of the stud 9, and the lower end of the flange 9a is fitted into the four parts 38 recessed in the inner surface of the valve body 2. There is.

The upper M13 is fitted into the upper end opening 12 of the valve body 2 via a gasket 40, and is fixed with a plurality of bolts (not shown).

After the seat ring 7 is inserted into the valve body 2, the retainer 17 is screwed into the upstream opening 19 of the valve body 2 via the seat spring 41 and the O-ring 42, and the seating surface 8 of the seat ring 7 is inserted into the valve body 2. It is brought into close contact with the spherical seating portion 25 of the plug 22.

Now, the procedure for assembling the rotary valve 20 having such a configuration will be explained in detail with reference to FIGS. 3 to 7.

First, the valve shaft 6 with the valve plug 21 and the top cover 13 are placed on a workbench. The valve stem 6 and the valve plug 21 are
As shown in FIG. 3, they are integrally joined by welding in advance. When welding, attach the inner end 6a of the valve stem 6 to the valve 7 lug 2.
1, the welding torch 44 is inserted into the valve plug 21 from the lower bearing part 24 of the valve plug 21, and the valve stem 6 and the valve plug 21 are fitted and positioned in the upper bearing part 23 of the valve plug 21.
The lower end 6a may be welded and fixed to the inner opening edge of the upper bearing portion 23 over its entire circumference while rotating the lower end 6a integrally.

After this, the outer circumferential surface of the valve 1 lug 21 is cut to remove welding distortion, and the processing of the 0-spherical seating part 25, which is to be the spherical seating part 25, may be performed by well-known tracing processing, but another processing method may be used. According to the valve plug processing method already proposed by the same applicant (Japanese Patent Application No. 2-215724), it is possible to obtain a spherical surface with high sphericity.

Note that this processing method involves rotating and feeding the valve plug along its center line, while advancing a cutting blade that is attached eccentrically to a rotating shaft that is perpendicular to the center line and rotates together with the rotating shaft. The outer peripheral surface of the plug is cut into a spherical shape.

The ground member 30 is assembled into the ground hole 15 of the upper lid 13 prepared on the workbench. That is, the spring washer 32 and the packing 31 are inserted into the ground hole 15 from above as shown in FIG.
, a backing 33a, a ground follower 35 whose inner and outer peripheries are sealed with an O-ring 34, and a backing 33b, and finally a retainer 18 made of an E-ring or the like is inserted into a groove formed on the inner peripheral surface of the ground hole 15.

In addition, a guide bush 37 and an O
Ring 36 is inserted.

Next, the upper end of the valve shaft 6 is inserted into the upper lid 13 in which the gland member 30 is incorporated from the opposite side of the seal structure, that is, from the lower end opening side via the thrust ring 46 (fifth
figure).

In the process of assembling the gland member 30 and the valve stem 6, the retainer 18 is slightly hammered in using a tool while it is in contact with the entrance of the gland hole 15.

However, although the yarn-like packing 31 bulges inward to some extent, it is press-fitted by applying an appropriate external force such as applying a rotational force when inserting the valve stem 6, and the dimensions of each part are adjusted so that a suitable liquid sealing effect can be obtained. decide. At this time, the valve stem 6 acts as a gripping portion, making it easy to apply force.

Next, the valve plug 21 and the valve shaft 6 are inserted into the valve body 2, and the upper cover 13 is fitted into the upper end opening 12 of the valve body 2 via the gasket 40, and fastened with bolts (Fig. 6). There are two possible assembly methods, one of which is to drop the stud 9 into the valve body 2 in advance, fit its lower end into the recess 38, and then insert the gas get 40 into the upper end opening 12. Place the top cover 1 on the stepped surface.
3, the valve plug 21 and the valve stem 6 that have been made into a unit are inserted into the valve body 2, and the lower bearing part 2 of the valve plug 21 is inserted into the valve body 2.
4 is fitted to the upper end of the stud 9, and the upper cover 13 is fitted and fixed to the upper end opening 12.

Another option is to turn the top cover 13 upside down and use the valve 1 lug 2.
1 facing upward, fit the stud 9 into the lower bearing part 24, place the gas get 40 on the upper lid 13, turn the valve body 2 upside down and place it on the valve plug 21 from above, and then fit the stud 9 into the valve body 2. The upper M13 is fitted into the recess 38 of the upper end opening 12.
are fitted through the gas get 40 and fastened and fixed with bolts. Then, the valve body 2 is returned to its original position.

In this case, the latter assembly method is more suitable for automatic assembly, but
Either is fine here.

After the drive system consisting of the valve stem 6 and the valve plug 21 is assembled into the valve body 2 in this way, the seat ring 7 is fitted into the upstream opening 19 of the valve body 2 as shown in FIG. At the same time, the retainer 17 that is the fixing means is fitted through the seat spring 41 and the O-ring 42, and the seating surface 8 of the seat ring 7 is fitted onto the spherical seating portion 25 of the valve plug 21.
Close to. Thereafter, a drive unit (handle) for applying rotational force to the outer end of the valve shaft 6 is attached, thereby completing the assembly work of the rotary valve 20.

[Effects of the Invention] As described above, the method for assembling a rotary valve according to the present invention is as follows:
The gland member is inserted into the gland hole of the top cover, and then the outer end of the valve stem is inserted into the gland hole from the opposite side of the seal structure to assemble the drive system, so it is easy to assemble the gland member to the gland hole. It is simple and easy, has excellent workability, and enables automatic assembly to improve productivity.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of a rotary valve employing the method of the present invention, FIG. 2 is a perspective view of the valve stem and valve plug, and FIG.
7 to 7 are diagrams for explaining the method of the present invention, and FIG. 8 is a sectional view showing a conventional example of a rotary valve. 2... Valve body, 6... Valve shaft, 6a-... Taber surface,
7... Seat ring, 9... Stud, 12...
Upper end opening, 13... Upper lid, 15... Ground hole,
17.18...retainer, 21...valve plug,
25... Spherical seating portion, 30... Ground member. Patent applicant Yamatake Honeywell Co., Ltd.

Claims (1)

[Claims] A valve plug having a spherical seating portion on the circumferential surface is coaxially fixed to one end of the valve shaft, and the other end of the valve shaft having a tapered surface is connected to a seal structure in which a gland member is pre-installed in the gland hole of the upper cover. A method for assembling a rotary valve, characterized in that the drive system is assembled by inserting the valve from the opposite side.