Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1995-05-22
1998-11-03
Chambers, A. Michael
Fluid handling
Processes
Cleaning, repairing, or assembling
137318, 137801, 251366, 251367, F16K 4300, F16K 5100
Patent
active
058294686
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a valve device comprising a metallic pipe material, a method of manufacturing of the valve device, and an apparatus used for the method of manufacturing thereof.
BACKGROUND ART
Every type of valve device such as a single valve device, a hot and cold water mixing device and the like are produced mainly by casting copper alloy or the like as a raw material. In the production by such casting, the body part of the valve device is produced integrally with delivery tubes and the like projecting from the body part. For example, a hot and cold water mixing device connected to a flow passage water pipes has a tube-like mounting flange for leg tubes connected to the back of the valve device body, which is also integrally formed therewith.
Instead of such a casting method, there is a valve device in which the valve device body and the delivery tubes are separately produced and are integrally connected by brazing or welding (for example, refer to JPA-Hei-1-182423).
FIG. 29 is a schematic view showing an example of such a valve device.
This valve device is produced by providing a hole 51a having a diameter D.sub.1 on the peripheral wall of the body 51 of a valve device made of a metallic pipe material and welding thereto a delivery tube 52 made of a metallic pipe material having an inner diameter d.sub.1 larger than the diameter D.sub.1 of the hole 51a by electric resistance welding.
However, the delivery tube 52 having an inner diameter d.sub.1 greater than the hole 51a being connected thereto causes a difference in the inner diameter between the opening of the body and the delivery tube 52, thereby suddenly enlarging the flow passage at the base end of the delivery tube 52. Further, as shown in FIG. 29(b), the peripheral portion of the hole 51a comes to enter the inner side of the delivery tube 52.
Since, in this way, the flow passage at the hole 51a and the base end of the delivery tube 52 is discontinuous in view of the cross-sectional area and form of the flow passage, a stagnation point is caused in the flow along the inner wall of the base end of the delivery tube 52 and, simultaneously, the generation of turbulent flow accompanied by eddies is unavoidable. This makes pressure loss greater as the flow passes therethrough, causing disruption of the delivery amount and noise. In addition, erosion is produced on the inner periphery at the base end of the delivery tube 52 and on the outer peripheral surface of the valve device body 51 connected thereto, and this has a great effect on the durability.
Furthermore, in order to bring the base end of the delivery tube 52 into an abutting engagement with the surface of the valve device body 51 and to join them, complicated working of cutting the base end of the delivery tube 52 along the form of the surface of the valve device body 51 is required, as shown in FIG. 29(c). This not only increases the number of the processes of working the delivery tube 52 but also makes the position of the delivery tube 52 apt to be inappropriate if precision in working is not maintained at a high degree, thereby making the process of inspection complicated. In addition, there is a problem in that, in the case where a new valve device body 51 different in diameter from the previous valve device body is used, a delivery tube 52 aligned with the diameter of the new valve device body must be made, thereby lowering production efficiency.
Further, since the end surface at the base end of the delivery tube 52 is used only as a portion where it is joined to the valve device body 51, alignment of the valve device body 51 with the delivery tube 52 using a jig at a process before welding is intricate. In addition, if such an alignment is not sufficient, the position of the delivery tube 52 deviates from the normal position, thereby increasing the rejects of the product.
Moreover, in the case where the conventional valve device as constructed above is, for example, turned with the delivery tube 52 grasped, or is provided at the end of the delivery t
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Enoki Masatoshi
Iwao Toshiyuki
Katahira Hiromi
Matsukuma Tatsuo
Matsuo Yuji
Chambers A. Michael
Toto Ltd.
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