JPS61297111A - Processing method for lining to main body of valve body of sluice valve having valve seat of elastic material - Google Patents

Abstract

PURPOSE:To perform by one effort lining processing wherein a supporting material neither come off nor broken away and neither protrusion of an adhesive agent nor defective appearance exist, by fitting the supporting material, which has been made into a form through which the same does not come off after lining, prior to the lining processing. CONSTITUTION:As for a main body 1 of a valve body, a supporting material 3 is stuck on the external surface, a shaft hole 11 and the internal surface of a side hole 12. A shaft hole core and two side hole cores are inserted into the shaft hole 11 and side hole 12. In this instance, though the shaft hole core is inserted into the shaft hole 11 in a penetrated state, an insertion hole core is inserted into a side hole 12 in a state wherein the shaft hole core is placed between an insertion hole core. Then the main body 1 of the valve body fitted with a core is loaded into a bottom force of a two-split mold, a top force is put over the same and lining preparation work is completed. An elastic lining material which is under a fluidized state is pressed into through a casting path communicating with the mold under this state. With this method, it is possible not only that positioning of the core also is performed easily but also that lining to the external surface and internal surface of the main body of the valve body is performed by one effort.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an elastic material used in fluid pipes such as water supply (including water supply, sewerage, industrial water supply, agricultural water supply, etc.), oil pipeline, etc. The present invention relates to a method of lining a valve body of a valve body valve seat gate valve.

[Prior Art] Material combinations of the valve body valve seat and the valve body valve seat in normal gate valves include metals and metals, metals and elastic materials, and elastic materials and elastic materials. Among these, elastic body valve seat gate valves (also referred to as soft seal gate valves) refer to combinations other than metal-to-metal combinations, such as Jllllllll^B
It is standardized as seen in 120-1884 etc.

In this elastic body valve seat gate valve, a method for manufacturing a valve body in which the entire inner circumferential surface and outer circumferential surface of the shaft hole and side hole of the valve body body are lined with an elastic material was developed in Japanese Patent Publication No. 58-49.
This has already been proposed in Japanese Patent No. 388 (hereinafter referred to as "prior art").

In this method, first, a core of the desired shape (this is referred to as a "temporary core") is inserted into the shaft hole and side hole of the valve body body to form a predetermined lining gap, and then the core is inserted into the gap. Fill with lining rubber to form an unvulcanized inner lining.

Next, the temporary core is removed from the valve body in this state and replaced with another core (this will be referred to as a "wooden core"), and the valve body is placed in a required mold with a predetermined lining gap. The inner and outer linings are completed by supporting the inner and outer linings in a fully vulcanized state and filling them with outer rubber in a fully vulcanized state.

However, with this conventional technology, it is necessary to accurately install the temporary core and wooden core in the mold, and it is also necessary to perform lining processing on the inner and outer rubber in two separate steps. However, it has the disadvantage that it takes time and effort.

[Technical Problem 1 of the Present Invention] The present invention solves these problems and provides an elastic body valve seat gate valve that is extremely simple, accurate, low cost, and has a good appearance on all external and internal surfaces of the valve body. The purpose (technical problem) is to provide a method for lining a valve body.

[Configuration and operation of the present invention] In order to achieve the above object, the method of lining the valve body of an elastic body valve seat gate valve of the present invention adopts the following configuration (technical means). That is, in a method in which a valve body of an elastic body valve seat gate valve is inserted into a mold and the entire external and internal surfaces of the valve body are lined with an elastic material, the outer surface of the valve body and the mold are Between the inner surface and the inner surface, supporting materials shaped so that they will not come out after lining are interposed at multiple locations to avoid the water stop part of the valve body and to support the valve body within the mold in the vertical and horizontal directions. It is characterized in that the outer lining space is secured by covering the outer surface of the lining, and then the outer lining space is filled with an elastic material in a fluid state.

Here, the "supporting material shaped so that it does not slip out after lining" is specified in the following examples.

Furthermore, although the supporting material is usually fixed to the valve body using an adhesive, it is not a requirement that the supporting material be fixed.

Furthermore, in the present invention, appropriate means such as injection molding, compression molding, etc. are used as a method for forming the lining.

With this configuration, the lining process on the outer surface of the valve body can be done all at once.

[Effect 1 of the present invention Since the valve body lining processing method of the present invention has the above-mentioned configuration, it has the following unique effects.

■ According to the method of the present invention, since the supporting material is installed in a shape that will not fall out after lining before lining processing, the supporting material will not slip out or come off, and
There is no adhesive protrusion or appearance defects.

■ According to the method of the present invention, since the support material is installed in the vertical and horizontal directions, the lining can be easily positioned when the valve body is inserted into the mold, and
Lining defects due to lateral displacement of the valve body can be prevented.

[Mode of implementation] The present invention adopts the following embodiments.

■ The surface of the support material that contacts the valve body must be larger than the surface that contacts the mold.

According to this aspect, the supporting material portion remaining on the surface of the elastic body coating after lining processing becomes small, so that an extremely good valve body of the elastic body valve seat gate valve with no supporting material can be obtained. Can be manufactured.

■ Forming the side surface of the support material into an uneven shape.

According to this aspect, ejection is prevented by engagement between the uneven side surface and the lining layer, and the contact support surface with the mold or the core is not reduced. This is effective for the inner lining of the valve body against the child.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 and 2 show an embodiment of an elastic body valve seat gate valve manufactured by the lining processing method of the present invention.

The gate valve (2) consists of a valve body body (1) which is lined, a lining layer (2), and a support material (3).

The valve body l is manufactured by metal casting, has a predetermined outer shape, and has a shaft hole 11 penetrating from the upper end to the lower end inside, and a side that communicates orthogonally with the shaft hole 11 and opens to both sides. When the hole 12 is provided, a narrowed portion 13 is provided at the lower end of the shaft hole 11.

The lining layer 2 covers the outer and inner surfaces of the valve body l (shaft hole 11
．． side hole 12), and on the outer surface, its lower edge 2
1 is formed in an arc shape, its both side edges 22 are formed as guide parts, and its front and rear wall surfaces 23 are formed in a bulge shape.

In the inner lining layer, a screw top K is installed at the intersection 14 of the shaft hole 11 and the side hole 12, and the main gate valve V is moved up and down by rotation of the spindle shaft that is screwed into the screw top K. . In addition, in the outer lining layer, the lower end edge 21 and the front and rear wall surfaces 23 form a "compression water stop part" that comes into compressive contact with the valve seats (1) and (J) of the valve box H and blocks the flow of fluid. (See Figure 5).

The support material 3 is embedded in the lining layer 2 on the outer and inner surfaces of the valve body 1 and has a shape that does not easily come out.

The supporting member 3 has one surface that contacts the valve body 1 fixed with an adhesive. 3A is a vertical support member, 3
B is the horizontal support.

Various aspects of the support material 3 are shown in FIGS. 3 and 4.

In the one shown in FIG. 3, the surface that comes into contact with the valve body l is larger than the other surface. For example, in Figure 3 (a
) shows a sectional view of a support in the form of a truncated cone or an operisk, and FIG. 3(b) shows a sectional view of a support in the form of a right circular cone or right circular pyramid.

The support member 3 shown in FIG. 4 has an uneven side surface.

The support material 3 is made of materials such as non-corrosive metals (eg, stainless steel, titanium), rubber and plastics with hardness of 90Hs or more, and ceramics.

FIG. 5 shows how the gate valve V is used. H is a valve box, 1. J is the valve seat of the valve box H. Further, K is a screw top, and L is a spindle shaft.

Next, an embodiment of the method of the present invention for manufacturing the gate valve V will be described.

(2) When carrying out external lining according to the method of the present invention, prepare the valve body l formed in a predetermined shape in advance, and before inserting the support material 3 into the mold. Adhere to the surface of the main body 1 with adhesive, avoiding the water stop part.

Next, two halves (upper and lower molds of upper and lower molds) are formed into a predetermined internal shape (that is, a shape for determining the outer lining layer and supporting the core described later).
A mold is prepared, and the valve body 1 and the ice body 1 with the supporting material attached thereto are placed in the lower mold.

At the same time, a shaft hole core to be inserted penetratingly into the shaft hole 11 and a side hole core to be inserted into the side hole 12 are installed inside the valve body l. In other words, both ends of the shaft hole core (±
It protrudes from the shaft hole 11 of the valve body 1 and engages with the mold, and one end of the side hole core protrudes from the side hole 12 of the valve body 1 and engages with the mold, The other end abuts against the side surface of the shaft hole core.

When installing the cores, the lower side hole core and the shaft hole core are installed on the valve body 1, and after engaging them with the retaining part of the lower mold, Cover the mold.

Engage the end of the upper side hole core with the retaining part of the upper mold.

By the above procedure, a space for outer mold relining is created between the outer surface of the valve body l and the inner surface of the mold, and a space for relining the valve body l is created.
As a result, a space for relining the lining is secured between the hole and the core.

After that, the elastic lining material in a fluid state is press-fitted from the injection section leading to the mold. When rubber is used as the lining material, the temperature is 155-185℃ and the pressure is 15℃.
0 to 300 kgf/cm'', and main vulcanization is carried out for 15 to 60 minutes.

Rubber and plastic having a hardness of 90 Hs or less are used as the elastic material.

In the example method in Section 1-1, the so-called injection molding of fluidized rubber has been described, but similarly fluidized rubber is filled in a coating form on the surface of the valve body 1 in a mold, and then This does not preclude the adoption of a so-called press molding mode in which the rear L lower mold is compressed and molded.

Furthermore, when a non-corrosive metal such as stainless steel or titanium is used for the support material 3, it is convenient because the pinhole inspection of the manufactured gate valve (1) can be carried out through the metal.

II. When carrying out outer lining and inner relining by the method of the present invention, a supporting material 3 is fixed to the outer surface of the valve body 1 and to the inner surfaces of the shaft hole 11 and side hole 12.

One shaft hole core and two side hole cores are inserted into the shaft hole 11 and the side hole 12. At this time, the shaft hole core is
The core for the side hole is inserted into the side hole 12 with the core for the shaft hole sandwiched therebetween.

Next, the valve body l fitted with the core described in "2" is inserted into the lower mold of the halved mold, and the upper mold is covered, thereby completing the lining preparation work.

In this state, there is a method in which a fluidized elastic lining material is press-fitted from the injection path leading to the mold to carry out lining processing in the same manner as in step I above.

According to this method, the core can be easily positioned, and the outer and inner surfaces of the valve body can be lined all at once, improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a partially cross-sectional, partially side view of an embodiment of an elastic body valve seat gate valve according to the method of the present invention, FIG. 2 is a partially cross-sectional, partially front view thereof, and FIGS. 3 and 4 are views according to the present invention. 5 is a cross-sectional view showing various aspects of the support material used in the present invention, and FIG. 5 is a diagram showing how the present elastic body valve seat gate valve is used. 1... Valve body body 2... Lining layer 3... Support material V... Elastic body valve seat gate valve

Claims (1)

[Scope of Claims] 1. In a method of inserting a valve body of a gate valve into a mold and lining the entire external and internal surfaces of the valve body with an elastic material, Between the outer surface of the valve body and the inner surface of the mold, a support material having a shape that does not come out after lining is placed to avoid the water stop part of the valve body and to support the valve body within the mold in the vertical and horizontal directions. A valve body of an elastic body valve seat gate valve, characterized in that the outer lining space is secured by interposing the outer lining space at a plurality of locations, and then the outer lining space is filled with an elastic material in a fluid state. Method of lining the main body. 2. The method of lining a valve body of an elastic body valve seat gate valve according to claim 1, wherein the support material has a surface in contact with the valve body that is larger than a surface in contact with the mold. 3. The method of lining a valve body of an elastic body valve seat gate valve according to claim 1, wherein the side surface of the support member is formed in an uneven shape.