Pipe joint made of resin

Abstract

The present invention relates to a pipe joint made of resin used for laying pipes in which a high-purity liquid, ultra pure water or the like flow. According to the pipe joint of the present invention, a sealing surface pressure is generated in both axial and radial directions, providing thereby an excellent sealing property for a long period, and facilitate controlling a torque for fastening a pushing ring. The pipe joint made of resin according to the present invention comprises a joint body having a receiving port, a cylindrical portion, an annular groove portion and a stepped surface. An inner ring forcedly inserted by the pushing ring is provided with an outer projection, an inner projection and an annular recessed portion. On at least one portion among axially opposed portions of each surface, an axial sealing portion is disposed. On at least one portion among radially opposed portions of each surface, an radial sealing portion is disposed. The joint body, the inner ring and the pushing ring are individually made of an optional synthetic resin selected among PFA, PTFE, ETFE, CTFE, and ECTFE.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a pipe joint made of resin, and in particular, to a pipe joint applied to laying pipes for a high-purity liquid and ultra pure water treated in a production process in various technical fields such as the production of semiconductors, medical supplies and medicines, food processing and the chemical industry.[0003]2. Description of the Prior Art[0004]Conventionally, such pipe joints made of resin having a structure as shown in FIG. 8 are known. The known pipe joint made of resin comprises a joint body 81, an inner ring 82 and a pushing ring 83. The joint body 81 has a receiving port 84, a tapered receiving surface 85 projecting from a base portion of the receiving port 84, and a tapered receiving surface 86 disposed on a tip portion of the receiving port 84. Additionally, an outer periphery of the receiving port 84 is provided with a male thread portion 87. The inner ring 82 includes a co...

AI Technical Summary

Benefits of technology

[0010]It is an object of the present invention to provide a pipe joint made of resin which enables an early sealing property to be maintained for a long time.

[0041]As mentioned above, according to the present invention, the early sealing property can be kept for a long period without severely controlling a torque for fastening the pushing ring, thereby making it possible to provide the pipe joint made of resin wherein neither a high technique nor skill is required in connecting operation.

Problems solved by technology

In such a pipe joint made of resin, creep and stress relaxation are generated with time on the joint body 81 made of resin and the pushing ring 83, the pipe 7 or the like, whereby the sealing surface pressures of the primary sealing portion S1 and the secondary sealing portion S2 are decreased with the result that there has been a fear that the sealing property will be lost relatively early.

Therefore, there is a problem wherein operational efficiency is lowered and high technique and skill are required in operation.

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