JPS62118171A - Cast iron valve - Google Patents

Abstract

PURPOSE:To make possible to weld a valve box to connecting pipes, by forming coupling pipes which are fitted in the upstream opening and downstream opening of the valve box, respectively, with an iron group material having its outer surface formed thereon with an iron-aluminum alloy layer. CONSTITUTION:A valve element 25 is moved up and down in association with the rotation of a valve rod 23, to make into contact with and separate from a valve seat 21 so that a valve 13 is opened and closed. The outer surface sections of connecting pipes 31, 33 are cast into the upstream and downstream ports of a valve box 11. Such a casting wrap of each connecting pipe 31, 33 is formed when the valve box 11 is cast. These connecting pipes 31, 33 are formed of an iron group material having its outer surface formed thereon with an iron-aluminum alloy layer. Such an iron materials is excellent in the close contact ability and is weldable. Thereby the connecting pipes may be welded in such a condition that pipe members 35, 37 are fitted thereto with no gap.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to cast iron valves.

[Prior art]

When connecting piping members to the upstream and downstream openings of a valve body, these piping members are welded to the openings of the valve in order to prevent leakage and ensure safety. .

Therefore, conventionally, valves have been formed using forged steel or cast steel, which are easy to weld, in order to ensure the durability of such welded parts.

[Problems with conventional technology]

However, forged steel or cast steel is expensive, difficult to process, and has poor castability, so it has been difficult to obtain high-quality valves in the past.

[Means for solving the above problems]

The present invention has been made to solve the above-mentioned disadvantages, and has the following configuration: A valve box having an upstream opening and a downstream opening, and a connecting pipe material, and the connecting pipe material is connected to the valve box. In a valve that is fitted into an upstream opening and a downstream opening, and the valve box can be connected to a piping member or the like via the connecting pipe material, the valve box is formed of cast iron and the connecting pipe is fitted into the upstream opening and the downstream opening, respectively. The pipe material is made of a ferrous material having an alloy layer of iron and aluminum on its surface, and the connecting pipe material is a cast iron valve that is cast into the outer surface of the valve box.

[Action of the invention]

In this invention, the iron-based material that is the material of the connecting pipe material and has an alloy layer of iron and aluminum on its surface has excellent adhesion and can be welded.

For this reason, it is impossible to weld the valve body (sturdy welding is impossible)
Even if it is made of cast iron, it can be welded to a piping member via the connecting pipe material, and as a result, it can function as a valve.

[Explanation of Examples]

Hereinafter, the present invention will be explained in detail based on FIG.

In FIG. 1, reference numeral 11 denotes a valve body of a globe valve B, which is cast from cast iron. This valve box 11 has an upstream opening 13 and a downstream opening 15. A partition wall 17 is integrally formed with the valve box 11, and partitions the inside of the valve box 11 into an upstream section and a downstream section. A through hole 19 is formed in the partition wall 17. This through hole 19 communicates the upstream side and the downstream side of the valve box 11. 21 is the valve seat, and the through hole 1
It is fixed by being screwed into the edge of 9.

Further, 23 is a valve body, and 25 is a valve body fixed to the lower end of the valve rod 23. The valve body 25 moves up and down in accordance with the rotation of the valve stem 23, and comes into close contact with and separates from the valve seat 21 to open and close the valve B. Note that 27 is a handle wheel installed at the upper end of the valve stem 23, and is used to rotate the valve stem 23.

Next, reference numeral 31 and 33 are connection pipe materials, and the outer surface portions thereof are cast into the upstream opening 13 and downstream opening 15 of the valve box 11. Such casting of the connecting pipes 31, 33 is performed when the valve body 11 is cast. This connecting pipe material 31.
33 is made of an iron-based material having an alloy layer of iron and aluminum on its surface. Here, since such iron-based materials have excellent adhesion and can be welded, the connecting pipe material 3
1.33 allows welding with the piping members 35 and 37 fitted without any gaps.

〔Effect of the invention〕

In the cast iron valve according to the present invention, the connecting pipe material is formed of an iron-based material having an alloy layer of iron and aluminum on the surface,
Since the valve body, which makes up most of the other parts, is made of cast iron that is inexpensive, easy to process, and has good castability, quality can be easily improved and it can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of an embodiment of a cast iron valve according to the present invention. 11...Valve box 13...Upstream opening 15...Downstream opening 31.33...Connecting pipe material B...Valve (globe valve) Patent applicant Asahi Malleable Iron Co., Ltd. 11 ．． ,・
Figure 1

Claims (1)

[Claims] (1) A valve box having an upstream opening and a downstream opening, and a connecting pipe, the connecting pipe fitting being fitted into the upstream opening and the downstream opening of the valve box, respectively, and the valve box having an upstream opening and a downstream opening. In this valve, which can be connected to a piping member etc. through this connecting pipe material, the valve box is made of cast iron, and the connecting pipe material is made of an iron-based material having an alloy layer of iron and aluminum on the surface. Further, the connecting pipe material is a cast iron valve that is cast into the outer surface of the valve body.