JPS608582A - Resin made valve and its manufacture - Google Patents

Abstract

PURPOSE:To enable a valve to be high efficiently mass-produced, by completing assembly work of the main unit of the valve simultaneously with the molding of a coating member in a metal mold. CONSTITUTION:The main unit essential part of a valve is built by preliminary assembly under the condition such that a recessed groove 11 in an inside body 4 molded by a synthetic resin material and a protrusion 12 in the side of a body cap 5 made similarly by synthetic resin are closely fitted. Next, this main unit essential part is inserted to a predetermined position in the cavity of a metal mold for molding a frame 13 and injection molded with a suitable resin material. In this way, the frame 13 of predetermined shape is integrally formed on a peripheral surface of the main unit essential part 10 by a molding pressure and a resin characteristic. In such way, assembly work of the main unit of the valve is also finished simultaneously with the completion of molding the frame 13.

Description

[Detailed description of the invention] The present invention relates to an all-resin valve and a method for manufacturing the same.

Making each part of the valve made of resin allows for mass production by injection molding, and has the advantage of providing an inexpensive valve with excellent corrosion resistance.

However, on the other hand, making the molded product thicker in order to provide strength to the body poses problems in terms of molding and has a negative side in terms of strength. Furthermore, when assembling the valve, it is necessary to apply a predetermined tightening load to the seal ring, gasket, etc.

For this reason, in conventional resin valves, the resin body is reinforced and assembled with a holder ring for holding.

Furthermore, the metal 19 cover that protects the resin body from external impact and tightening stress is added to 1.1 for strength reinforcement. I72 configuration requirements, or add a valve body cover to press and hold the inner valve body and seal ring, and tighten these using fastening members such as multiple tightening bolts (mostly made of gold and 1S). was.

In this way, conventional resin valves require side holes to reinforce the strength and apply a specified tightening load, and metal parts are often used for these, which reduces production costs and completely This has been a major obstacle to imparting corrosion resistance.

The present invention solves these conventional problems all at once, and skillfully utilizes the molding process using 4F+J resin.
It is an object of the present invention to provide a resin valve and a method for manufacturing the same, in which assembly of a valve body can be completed at the same time as molding of a valve member in a mold.

The present invention will be explained below based on the drawings.

Fig. 1 is a longitudinal cross-sectional view showing the internal structure of the valve according to the present invention, Fig. 2 is a longitudinal cross-sectional view of the main parts of the valve body temporarily assembled, and Fig. 3 is a mold assembly of the valve according to the present invention. The figure is shown below.

In Fig. 1, reference numeral 1 denotes a resin spherical internal valve body (hereinafter abbreviated as "valve element l"), and 2 a resin stem (hereinafter referred to as "valve element l") for rotating the valve element l to shut off fluid or adjust the flow rate. drive shaft)
, 3a, 3 is a resin seat ring for blocking fluid, 4 is a resin inner body, 5 is a resin body cap, 6 is a gland packing, 7 is a packing holder, 8 is a thrust washer, All of these are made of resin.

Further, 9 is an O-ring made of synthetic rubber.

The above-mentioned parts 1 to 9 are temporarily assembled as shown in FIG. 2 to form the main part 10 of the valve body.

In this case, the inner body 4 and the body cap 5 are arranged such that the recess iM 11 on the inner body 4 side and the protrusion 12 on the body cap 5 side are fitted between the inner ends of the inner body 4 and the body cap 5. The outer surface of the inner end of the body cap 5 is brought into close contact with the outer surface of the body cap 5 at rlξ.

Moreover, most of the circumferential surface of the valve body principal part lO temporarily assembled in this way is the inner body 4 and the body cap 5.
It is occupied by the circumferential surface of

Reference numeral 13 shown in FIG.
This is a resin V frame that is integrally joined by molding pressure.

This frame 13 has a shape that exactly covers the main part 10 of the main body, and the end surface of the frame 13 are in pressure contact.

The valve body has the frame 13 attached to the main body part lO.
Wit and formed. At the top of the cylindrical frame 13 of the valve body, an O-ring 14 made of synthetic rubber
A head cap 15 is fitted onto the outside through.

The above-mentioned valve of the above-mentioned 0/# is manufactured in the following manner.

Inner valve body 1. Stem 2. Inner body 4. body cap 5
．． Packing presser 7. The head caps 15 are each individually injection molded from a suitable resin material. Further, seat rings 3a and 3b of predetermined shapes, a gland packing 6, a thrust washer 8, and 0 rings 9 and 14 are prepared, respectively.

Next, the main part of the valve body 1 is selected from among the above-mentioned parts.
0 is temporarily assembled and inserted into a predetermined position 16 in the cavity of a 7-frame 13 mold.

Figure 3 shows the mold assembly diagram in that case, where 16 is a fixed side mounting plate, 17 is a fixed side mold plate, 18 is a movable side mold plate,
19 is a movable side mounting plate, 20 is a receiving plate, 21 is a locate ring, 22 is a spool bushing, 23 is a slide nest, 24 is a core nest, and 25 is an eject turbine.The main body part 10 is inserted like this. A suitable resin material is injection molded in a mold for molding the frame. Thereby, the frame 13 having a predetermined shape is integrally implanted on the peripheral surface of the main body part 10 by molding pressure and resin properties. Furthermore, the molding pressure during frame molding affects the seat rings 3a, 34 and the seal holder 7 as an appropriate tightening load, and the assembly of the valve body is completed at the same time as the molding of the frame is completed.

At the top of the frame 13 molded in this way, a first
As shown in the figure, the above embodiment valve can be obtained by attaching a head cap 15 via an O-ring 14.

As explained above, according to the valve of the present invention, the frame which is crimped and covered with the surfaces of the inner body and the body cap reinforces the strength of the inner body and the body cap. In particular, these body parts provide toughness and prevent deformation against the clamping stress that is applied when connecting pipes at the inlet/outlet part. It also protects against external shocks.

Furthermore, according to the method of the present invention, the seven frames are covered by injection molding with the temporarily assembled main body parts inserted into a mold. Appropriate pressure is applied to the seat ring and the packing holder on the drive shaft side, and the assembly of the pulp body can be completed at the same time in this frame molding die.

This eliminates the holder ring, metal cover, or valve body cover, which were the components of conventional resin valves.

In addition, the tightening bolt and the tightening work can be reduced all at once.

In this way, the present invention has a small number of parts despite being entirely made of resin, completes the assembly of the main body at the same time as manufacturing the molded product, and eliminates the need for tightening work, which significantly reduces production man-hours. has been done.

Therefore, resin pulp with excellent performance in terms of corrosion resistance and strength can be produced with high efficiency and can be provided at a very low cost.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the internal structure of the valve according to the present invention, Fig. 2 is a vertical cross-sectional view of the main parts of the temporarily assembled pulp body, and Fig. 3 is a mold assembly of the valve according to the present invention. The figure is shown below. 1... Spherical inner valve body 2... Stem 3a, 3b.
...Seat ring 4...Inner body 5...Body cap 10...Pal 7' Body "J? Part ta"
...Frame patent applicant Nisshin Gas Kizai Co., Ltd. Toyo Kako Co., Ltd. Procedural amendment 1982 Patent No. 11.6606 2 Title of invention Resin valve and method of manufacturing the same 3 Related Patent Applicant Representative: Motomoto Hashi, 4th Representative, Address: J-3-17, Takara-cho, Toyama City, Toyama Prefecture As shown in the attached page To Otsu Bandai

Claims (1)

[Scope of Claims] 1) A resin valve characterized in that the outer surface of the internal component is covered with a synthetic resin member. 2) A method for manufacturing a resin valve, characterized in that the assembly of the valve body is completed at the same time as the molding of the covering part side in a mold.