JPS594225Y2 - valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device suitable for use in controlling special fluids.

For valve devices that control special fluids such as slurry, high viscosity fluids, and chemicals, it is necessary to select materials for the valve body and valve stem according to the characteristics of the fluid to prevent corrosion and wear caused by the fluid.

For this purpose, there is a case where the liner 32 and the plug 33 are made of ceramic and assembled into the main body 31 as shown in the third illustrated example.
It is not possible to block fluid from penetrating into the seal portion between the two.

After all, in this valve, since the main body 31 and the valve stem 35 are constantly in contact with the fluid, they are subject to erosion, which greatly reduces durability.

This invention was made in view of the points mentioned above.
The purpose of this is to reliably prevent fluid from leaking into contact with the structural parts that cover the ceramic interior parts from the outside.The technical means of the present invention for this purpose is to A ceramic liner is fixed to the inner peripheral surface of the valve body, and a lower end of the ceramic box is brought into contact with the bottom surface of a recess formed on the outer peripheral surface of the liner via a packing, and the box is provided with a pressurizing means. The top cover is pressed against the liner, and a ceramic plug attached to the valve stem is inserted through the top cover, box, and liner so that its tip faces the inner hole of the liner,
The body is sealed with a gasket packed inside the box, and during assembly work or transportation, pressing the top lid causes excessive force to be applied to the ceramic box. The valve body is characterized in that a stopper for preventing excessive pressing is provided between the upper cover and the valve body to prevent damage to the valve body.

Hereinafter, the configuration of the present invention will be explained in detail based on an embodiment shown in the drawings.

FIG. 1 is a longitudinal sectional view showing the valve device according to the present invention when the valve is open, and FIG. 2 is a longitudinal sectional view taken along the line AA in FIG. 1.

In these figures, the reference numeral 1 indicates the entire valve device, and the valve device 1 has a cylindrical valve body 2 with both ends open.

The valve body 2 has flanges 3 integrally provided at both ends thereof.
It is connected to a pipe (not shown) via a and 3b, and a cylindrical ceramic liner 5 is fixed to the inner peripheral surface 4 with an adhesive 6 such as epoxy resin.

In this embodiment, the liner 5 is made of ceramic containing 90% or more of A1203 (alumina oxide) powder and using silicon as a binder, and has a circular shape on the upper surface of the center of its outer peripheral surface. A recess 7 is formed.

Corresponding to the four portions 7, through holes 8 having the same diameter are also formed on the upper surface of the central portion of the valve body 2.

A stuffing box 9 formed from a bottomed cylindrical body made of ceramic is fitted into the through hole 8, and the lower end of the stuffing box 9 is inserted into the recess 7 of the liner 5.
It is fitted through a gasket 10 such as (trade name).

Reference numeral 11 denotes a valve shaft that is moved up and down, and the upper end of this valve shaft 11 is integrally formed with a screw 12 for connecting a drive unit, and the upper end of a cylindrical plug 13 made of ceramic is fitted to the lower end. , are firmly fixed with adhesive 14.

The plug 13 is inserted into a hole 15 formed at the bottom of the stuffing box 9 and an insertion hole 16 formed at the bottom of the recess 7 of the liner 5, and its lower end is inserted into the liner 5.
It faces the inner diameter 18 of.

The lower end of this plug 13 is connected to the inner hole 1 of the liner 5.
By being formed in a hemispherical shape with a radius approximately equal to the diameter of the hole 8, a spherical valve head 17 is formed, and as the valve stem 11 descends, the liner 5 The valve device 1 is completely closed by being crimped onto the lower surface of the inner hole.

Note that the insertion hole 16 of the liner 5 also has the same hole diameter as the inner hole 1B.

The stuffing box 9 has bolts 20 attached to the valve body 2.
It is held down by an upper lid 21 which is fixed by.

An annular projection 22 is integrally formed on the bottom surface of the upper lid 21.

This protrusion 22 is a recess 23 formed on the outer peripheral surface of the valve body 2.
is fitted and engaged with the pressurization prevention means.

That is, by appropriately setting the total height of the stuffing box 9 and the packing 10, even if an excessive force is applied when fixing the top cover 21, the annular protrusion 22 can be secured to the recess 2.
Since the stuffing box 9 and the gasket 10 act as a stopper for the bottom surface of the gasket 3, a large pressing force is not applied to the stuffing box 9 and the gasket 10. Therefore, an appropriate force is applied to the stuffing box 9 and the gasket 10 so that the sealing function of the gasket 10 can be maximized without destroying both members. It can be assembled with.

This protrusion is also effective when unexpected force is applied to the top cover, such as when transporting the valve.

Note that 30 is an O-ring as a seal reinforcing means.

In the gap between the stuffing box 9 and the plug 13,
Various types of gaskets 24 and 25 are inserted.

These packings 24, 25 are pressed from above by the presser member 26 via the follower 27, so that the annular packings 24, 25 bulge in both the inner and outer diameter directions.
The gap between 1 and the upper lid 21 is sealed.

The holding member 26 that presses the follower 27 is connected to a mounting plate 29 screwed onto the upper end of the upper lid 21 by a plurality of bolts 28 (only one is shown in FIG. 1).

In the above embodiment, the liner 5, the stuffing box 9, and the plug 13 are all made of ceramic containing A1□03 as a main component and using silicon as a binder, but the present invention is not limited to this. Rather, any material may be used as long as it is made of a ceramic material with excellent wear resistance and chemical resistance.

As is clear from the above description, in the valve device according to the present invention, not only the liner and the plug are formed of ceramic material, but also fluid leakage from the combination gap of these internal parts can be prevented from leaking into the external covering part. Furthermore, the ceramic stuffing box, which is a brittle material, is protected from external forces during assembly or during transportation of the valve.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a valve device according to the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1. Moreover, FIG. 3 shows a conventional example. 1...Valve device,
2... Valve body, 5... Liner 7...
... recess, 9 ... stuffing box,
10... Gasket, 11... Valve stem,
13...Plug, 16...Through hole, 1
7...: Spherical valve head, 18... Inner hole, 2
0...Tighten with bolt, 21...Top lid, 22...Annular protrusion as a stopper, 4 25...Putskin.

Claims (1)

[Scope of utility model registration request] A ceramic liner formed into a cylindrical shape and fitted into the valve body, a ceramic stuffing box provided so that its lower surface abuts the bottom surface of a recess provided on the outer peripheral surface of the liner via a gasket, and this an upper lid that is tightened and fixed to the valve body so as to press the box against the liner; a stopper provided between the upper lid and the valve body so that excessive tightening force is not applied to the box; and the upper lid;
A valve device consisting of a ceramic plug that passes through a box and a liner in sequence so that its tip faces the inner hole of the liner and whose body is sealed with a packing packed inside the box.