Blind plate for high-pressure testing of valve

Abstract

The invention discloses a blind plate for high-pressure testing of a valve. The blind plate comprises an outer plate body, an inner core and an injection hole, wherein the outer plate body is fixedly connected with the valve through a bolt or pressed by a pressing device to be forced to make close contact with the valve, the inner core is integrally formed in the middle of the inner side face of the outer plate body and capable of being inserted into a valve port of the valve in a matched mode, the injection hole penetrates through the outer plate body and the inner core, an annular groove is formed in the outer periphery of the inner core, a sealing ring is embedded in the annular groove, and at least one through hole is formed between the annular groove and the injection hole. The blind plate is simple in structure, adaptable to valves of various types including the flange type and the welding type, and compatible with various installation methods. The sealing ring and the injection port between the inner core and the valve are communicated through the through hole, and the higher the pressure of the injection port is, the force of a medium squeezing the O-shaped ring is larger, sealing is tighter, and sealing performance is better.

Description

technical field [0001] The invention relates to the technical field of valve manufacturing, in particular to a valve high-pressure pressure test blind plate. Background technique [0002] In pipeline construction, whether the valve sealing performance is qualified or not is of great importance. In the past, the method used for pressure testing of valves was to install corresponding blind plates at both ends of the pressure testing valve and fasten them with bolts respectively. This pressure testing construction method requires a lot of manpower, material resources and construction period for pressure testing. There are as many as 20 to 30 bolts for a valve, and it takes time and labor to tighten them one by one. It is often impossible to ensure that there are enough valves installed, which directly affects the construction progress. Bolt tightening and pressure are easily affected by the quality of the bolt itself, and it cannot be guaranteed that all points on the sealing ...

AI Technical Summary

Problems solved by technology

There are as many as 20 to 30 bolts for a valve, and it takes time and labor to tighten them one by one. It is often impossible to ensure that there are enough valves installed, which directly affects the construction progress.

Bolt tightening and pressure are easily affected by the quality of the bolt itself, and it cannot be guaranteed that all points on the sealing surface are pressurized in place, which affects the quality of inspection

Moreover, even if the bolts are installed in place, when the high-pressure water test is performed, there is still a problem of leakage caused by too much pressure on the sealing ring

[0003] Among them, for welded valves, although the above-mentioned installation problems do not exist, the sealing problem under high pressure still exists

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