JPH09222178A - Valve with electric welding coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause a metallic valve and an electric welding coupler to be posi tively and integrally assembled and further enable them to be endurable against a long term use by a method wherein a body of a metallic valve is integrally covered with a resin constituting the electric welding coupler. SOLUTION: A valve with electric welding coupler is made such that a resin constituting an electric welding coupler 3 and resin covering sections 2b, 2c of a body 2a of the metallic valve 2 are integrally formed, so that the coupler 3 and the metallic valve 2 are welded at wide area and welded in complex shape and even of they are used for a long period of time, inner fluid is not leaked out of a welding surface between the body 2a of the metallic valve 2 and the resin or the welding surface is not peeled off by a temperature or a pressure of the inner fluid, and the electric welding coupler 3 is not peeled off form the electrical welding coupler 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve with an electric fusion joint used by being installed in a pipeline or equipment using resin pipes.

[0002]

2. Description of the Related Art In order to facilitate connection to a resin pipe, a valve with an electric fusion joint part, in which the resin electric fusion joint part is pre-mounted on a bronze or stainless steel metal valve, is available. , Traditionally made. FIG. 3 is a vertical sectional view showing an example thereof.

In FIG. 3, 11 is a valve made of metal such as bronze or stainless steel, 12 is an electric fusion joint of resin, and 13 is embedded in this electric fusion joint 12 as shown in the figure. It is a heating element such as nichrome wire.

The electric fusion-bonded joint portion made of resin has a socket portion 12a into which a resin pipe is inserted, like the joint portion indicated by reference numeral 12 in FIG. A heating element 13 such as a nichrome wire near the peripheral surface
Is a resin-made joint portion in which a resin pipe is inserted into the socket portion 12a, and the heating element 13 is energized to generate heat to melt the resin around the heating element 13 and the socket portion 1
2a is a joint portion adapted to be fused to a resin pipe.

In the electric fusion-bonding portion 12 shown in FIG. 3, a metal valve 11 and a heating element 13 are placed in a resin molding die, and molten resin is injected into the die to form a metal. It is formed by fusion-bonding the heating element 13 to both connection end portions 11a of the valve 11 for manufacturing. The electric fusion-bonded joints 12 on both sides of the metal valve 11 may be molded on the left and right sides at the same time by one set of dies, and the left and right sides may be formed by one set of dies or by two sets of dies. Sometimes the parts were molded separately.

Unlike the above method, the electric fusion joint 1
2 is embedded in a heating element 13 and molded in advance into a shape as shown in the figure.
It may be inserted into 1a and adhered using an adhesive.

[0007]

As described above, the electric fusion-bonded joint portion 12 made of resin is connected to the connecting end portion 1 of the metal valve 11.
In the conventional one that is fused or adhered for each 1a,
Long-term use due to peeling stress on the fusion surface or adhesion surface caused by the difference in thermal expansion between resin and metal due to the temperature of the internal fluid, and peeling stress or drawing stress on the fusion surface or adhesion surface due to the pressure of the internal fluid In the meantime, there arises a problem that a gap is formed on the fusion bonding surface or the adhesion surface to allow the internal fluid to leak out, and the electric fusion bonding portion is disengaged from the connecting end portion of the metal valve. The present invention is for solving such a problem, and an object of the present invention is to provide a novel useful metal valve and an electric fusion-bonding portion which can be reliably integrated to withstand long-term use. To provide a simple valve.

[0008]

The valve with an electric fusion joint portion of the present invention is formed by integrally molding the body of a metal valve with a resin forming the electric fusion joint portion.

In this case, the electric fusion-bonded portion may be at least one of the joint portions of the valve with the electric-fusion portion.

In the valve with the electric fusion joint of the present invention, the resin forming the electric fusion joint and the resin coating the body of the metal valve are integrally formed as described above. The metal part and the metal valve body are fused together in an extremely large area and in a complicated shape, and even if they are used for a long period of time, due to the temperature and pressure of the internal fluid, the metal valve body and resin will melt. The internal fluid never leaks through the attachment surface, and the fusion surface never peels off or comes off, and the electrofusion joint does not separate from the body of the metal valve.

Further, the same action and effect as described above can be obtained even if the number of the electric fusion-bonded joints is not all but one or several.

[0012]

1 is a vertical cross-sectional view showing an embodiment of a valve with an electric fusion joint of the present invention.
Reference numeral 1 is a main body of a valve with an electric fusion joint portion, 2 is a metal valve, and this valve 2 includes a gate valve, a globe valve, a ball valve and other valves. Reference numeral 3 is an electric fusion joint portion, and 4 is a heating element such as a nichrome wire embedded in the electric fusion joint portion 3 as shown in FIG.

The resin forming the electric fusion-bonded portion 3 is formed integrally with the resin that covers the body 2a of the metal valve 2 not only to the connecting end portion 2b but also to the central portion 2c thereof. The parts 3 are provided on both sides of the metal valve 2.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the valve with the electric fusion-bonding portion of the present invention. The electric fusion-bonded joint portion 3 is provided only on the right side of the figure, and on the other side (the left side of the figure), a metal pipe or tank is formed by the female threaded joint portion 2d of the metal valve 2.
It is designed to be connected to metal devices such as pumps.

Also in this case, the resin forming the electric fusion joint 3 covers the body 2a of the metallic valve 2 not only to its connecting end 2b but also to the central portion 2c and further to the other connecting end 2e. It is formed integrally with the resin.

Next, the operation of the valve with the electric fusion joint portion of the present invention will be described with reference to FIGS. 1 and 2. The valve with an electric fusion joint of the present invention shown in FIGS. 1 and 2 includes a resin forming the electric fusion joint 3 and a resin covering the portions 2b, 2c, 2e of the body 2a of the metal valve 2. , The joint part 3 and the metal valve 2 are integrally formed.
Are fused in a large area and have a complicated shape, and even if they are used for a long period of time, the internal fluid flows through the fusion surface between the body 2a of the metal valve 2 and the resin due to the temperature and pressure of the internal fluid. Will never leak out, and the fusion-bonded surface will never peel off or come off, and the electric fusion-bonded joint portion 3 will not separate from the metal valve 2.

The valve 5 with the electric fusion joint shown in FIG.
As described above, even if the electro-fusion joint part 3 is not the entire joint part of the valve 5, the same operation and effect as described above can be obtained.

[0018]

The valve with the electric fusion joint of the present invention is
As already explained, even if it is used for a long period of time, due to the temperature and pressure of the internal fluid, the internal fluid may leak through the fusion surface between the metal valve body and the resin, or the fusion surface may peel off. It will never come off and the electrofusion joint will not separate from the body of the metal valve. Further, this valve with an electric fusion joint is much more robust against the pressure of the internal fluid, the stress of the pipe and the external force than the resin valve.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a valve with an electric fusion joint of the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the valve with the electric fusion joint portion of the present invention.

FIG. 3 is a vertical cross-sectional view showing an example of a conventional valve with an electric fusion joint portion.

[Explanation of symbols]

 1, 5 Valve body 2 Metal valve 2a Body 3 Electric fusion joint

Claims (2)

[Claims] 1. A valve with an electric fusion-bonding portion, characterized in that a body of a metal valve is integrally covered and molded with a resin forming the electric-fusion-bonding portion. 2. A valve with an electric fusion joint according to claim 1, wherein the electric fusion joint is provided at at least one of a plurality of joints.