JPH1073175A - Stainless steel valve for corrosion/earthquake resistant piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sufficient earthquake resistance and resistance for chemical and physical electric corrosion by forming a main part of stainless steel, and insertably fitting and connecting ends of a pipe body to connection pats of both sides of a valve casing through insulative elastic rings. SOLUTION: A valve 1 is mainly made of stainless steel. Rubber lining for giving elasticity is applied to a surface of a valve element 11 which opens and closes a flow passage through its vertical motion. A leading end of a pipe body 3 is fitted to a connection part 2 of each of both sides of a valve casing. A lock ring 12 is fitted to an inner surface of the connection part 2. The pipe body 3 is freely inserted within a range until the ring 12 is engaged by a projection 13 an the tip of the pipe body 3. A tapered insulating elastic ring 14 is arranged between an inner surface of the connection part 2 and the outer surface of the pipe body 3 as an insulator. Its material is preferably rubber/elastomer having proper elasticity and a high electric insulation property. Pressurizing force of the ring 14 is adjusted by a bolt 16. Chemical corrosion by environment is avoided, physical electric corrosion is prevented since metal contact is eliminated between the pipe body and the valve, and displacement can be eliminated at the time of an earthquake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stainless steel valve used for pipes such as water and sewage for the purpose of providing the pipes with corrosion resistance and earthquake resistance.

[0002]

2. Description of the Related Art A typical seismic pipe for a conventional water supply is shown in FIG. Here, the connection system between the water control valve 41 and the pipe body 42 is an ordinary flange joint. And in order to give elasticity and bending flexibility to this pipeline,
S2 type chain joint 43 and K type soft joint 44 are provided on both sides of valve 41.
Are connected, and the whole is used in an integrated state. Further, the conventional water control valve 41 is usually made of cast iron, and the connecting portion to the pipe 42 is a simple direct connection method, and the metals are brought into contact with each other.

[0003]

However, the conventional valve is made of cast iron and is not particularly high in corrosion resistance.
Depending on the soil environment of the buried site, chemical corrosion may occur. In order to prevent this chemical corrosion, a stainless steel valve with high corrosion resistance should be used, but simply changing the valve to stainless steel will cause dissimilar metal contact due to connection with the cast iron pipe. In addition, there arises a problem that a spontaneous potential difference occurs between both dissimilar metals and physical electrical corrosion occurs. Furthermore, in the conventional type, the connection type of the valve is a fixed type flange joint type, so that a joint having expansion and contraction is connected to both sides of the valve in order to provide earthquake resistance, and the whole is integrated ( Integral length: L).

[0004] In view of the above, the present invention provides a pipe configuration having sufficient corrosion resistance against both chemical corrosion and physical electrical corrosion and having both earthquake resistance. To provide a convenient stainless steel valve. Another object of the present invention is to provide a stainless steel valve in which the connection portion of the valve itself has expansion and contraction flexibility and does not require the use of another seismic joint for earthquake resistance.

[0005]

The technical means of the stainless steel valve according to the present invention is as follows. The main part of the valve is made of stainless steel, and the valve box has connection portions at both ends thereof. Are fitted and connected via an insulating elastic ring so as to be freely inserted and removed.

[0006] Further, a lock ring may be fitted to the connecting portion to provide a tube body retaining function. Further, the insulating elastic ring may be formed as a tapered ring, and may be press-fitted between the connecting portion and the pipe by a pressing ring. Further, the insulating elastic ring may be fitted and fixed to the connecting portion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a pipe configuration of the present invention. Reference numeral 1 denotes a water control valve, and in this embodiment, a stainless steel soft seal gate valve is used. The connecting portion 2 of the valve has a flexible structure that can be extended and contracted, and an insulating material 4 is interposed at a contact portion with the tube 3 so that the tube 3 and the valve 1 do not come into direct contact with each other. 5 is a pipe joint,
It is connected to both sides of the valve 1. In the illustrated example, an S2 type chain joint is used for the pipe joint 5, but the type of the joint is free, and it is not always necessary to use an expansion / contraction flexible joint.

A first embodiment of the valve of the present invention is shown in FIG. The valve 1 is a soft seal type gate valve, and a stainless steel material is used for a main part such as a valve box. When the valve stem 10 is rotated, the valve 1 moves up and down to open and close the flow path. The surface of the valve body 11 is subjected to rubber lining in order to impart elasticity. Further, connecting portions 2 for connecting the pipes 3 are provided on both sides of the valve box of the valve 1.

The type of the connecting portion 2 is an S2 type joint type in the first embodiment. That is, the connecting portion 2 is slightly widened to serve as a receiving port, while the distal end of the tubular body 3 serves as a receiving port,
The distal end of the tube 3 fits into the connection portion 2. Further, a lock ring 12 is fitted into the inner surface of the connection portion 2, and collides with a convex portion 13 formed on the outermost end surface of the tubular body 3, thereby fulfilling a function of retaining. The tube 3 is provided with a lock ring 12.
It can be freely inserted, removed, and moved within the range until it is locked by collision.

As the insulating material 4, an insulating elastic ring 14 is used. This ring 14 is tapered and is interposed between the inner surface of the connecting portion 2 and the outer surface of the tube 3. As a material of the insulating elastic ring 14, a material having appropriate elasticity and high electric insulation, for example, rubber or elastomer is used. Reference numeral 15 denotes a pressing ring, which is an insulating elastic ring 1
4 is given a pressing force in the pushing direction. 16 is a connection part 2
The bolt 16 is tightened by a bolt attached between the flange of the pressing ring 15 and the flange of the pressing ring 15, and the pressing force applied to the insulating elastic ring 14 is adjusted. Note that FIG.
In the figure, the tube 3 is connected only to the left connecting portion 2 for the sake of illustration, but the tube is connected to the right connecting portion in the same manner.

A second embodiment of the valve of the present invention is shown in FIG. In the second embodiment, the connecting portion 2 has a joint type different from that of the first embodiment. That is, the insulating elastic ring 14 is fitted and fixed to the inner surface of the connection portion 2 serving as the receiving port, and the pressing ring as in the first embodiment is not used. An elastic ring 17 is attached to the outside of the lock ring 12. In the connection system of the second embodiment, similarly to the first embodiment, in addition to having the ability to be pulled out and inserted, an appropriate bending flexibility and a retaining function, and having earthquake resistance,
Since the valve 1 and the tube 3 are electrically insulated, no electrolytic corrosion occurs. In addition, compared to the first embodiment, there is an advantage that workability when fitting the tube 3 into the connecting portion 2 is good.

The present invention is not limited to the above embodiment, but can be freely modified and implemented within the scope of the claims. In particular, the form of the connection portion may be any one that has elasticity that can be freely inserted and removed and insulation, and the detailed structure is free. Further, in the embodiment, the connection portion 2 is the receiving port and the tube 3 is the insertion port. However, the relationship may be reversed.

[0013]

Since the valve of the present invention is made of stainless steel, it is not subject to chemical corrosion due to the buried soil environment, and furthermore, an insulating material is interposed between the pipe and the valve, and the direct connection between the metals. Since there is no contact, there is no physical electrical corrosion. Further, in the valve of the present invention, since the connecting portion between the valve and the pipe body can be freely inserted and removed and has flexibility, it can absorb the displacement at the time of an earthquake, there is no damage to the pipeline caused by the earthquake, and the valve Since the connecting portion itself has an earthquake-resistant joint function, there is no need to connect and use a joint having an earthquake-resistant function as in the related art. Therefore, when the valve of the present invention is used, practical benefits such as simplification of the pipe configuration, high durability, and safety against earthquakes can be obtained.

According to the second aspect of the present invention, since the tube has the function of preventing the tube from coming off, it is possible to prevent the tube from coming off at the time of large displacement, and it is possible to further improve the earthquake resistance.

According to the third aspect of the present invention, it is possible to provide a necessary corrosion and earthquake resistance function with a simple structure.

According to the fourth aspect of the present invention, it is possible to provide a valve which can easily connect the pipes.

[Brief description of the drawings]

FIG. 1 is a pipeline diagram using a valve of the present invention.

FIG. 2 is a sectional view of the first embodiment.

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a conventional pipeline diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve 2 Connection part 3 Tube 4 Insulation material 12 Lock ring 13 Convex part 14 Insulation elastic ring 15 Press ring 16 Bolt 17 Elastic ring

Claims (4)

[Claims] The main part of the valve is made of stainless steel,
The valve housing has connecting portions at both ends, and the connecting portion is connected to the end of the pipe via an insulating elastic ring so as to be freely inserted and removed. Stainless steel valve. 2. A stainless steel valve for a corrosion-resistant and earthquake-resistant pipeline according to claim 1, wherein a lock ring is fitted to the connecting portion and has a function of preventing the pipe from coming off. 3. The insulating elastic ring is a tapered ring,
2. The stainless steel valve for a corrosion-resistant and seismic pipe according to claim 1, wherein the valve is press-fitted between the connecting portion and the pipe by a pressing ring. 4. The stainless steel valve according to claim 1, wherein the insulating elastic ring is fitted and fixed to the connection portion.