A pre-assembly auxiliary tool and method for butterfly valve sealing ring

Abstract

The invention discloses a butterfly valve sealing ring pre-assembling method. The butterfly valve sealing ring pre-assembling method comprises the following steps: a guide plate is centrally arrangedin a fixed base body and the fixed base body is fixedly connected with the guide plate; a lower lip of a sealing ring is arranged in a round groove between the guide plate and the fixed base body; thelower plane of a first pressing plate is contacted with the plane of an upper empennage of the sealing ring, the first pressing plate is pressed down, and an inner ring of the sealing ring and an excircle of the guide plate are extruded to perform extrusion molding and natural centering on the inner ring of the sealing ring; the first pressing plate is disassembled; and a lower arc convex part ofa second pressing plate is aligned with the middle part of an upper lip of the sealing ring, so that the sealing ring is subjected to extrusion molding and the position of an E alloy spring is fixed.The butterfly valve sealing ring pre-assembling method has the following advantages: pre-forming of the sealing ring is realized; the leakage condition caused by non-uniform post-deformation generated by the fact that the butterfly valve sealing ring is directly arranged into the valve body or the condition that the sealing ring is damaged by excessive deformation caused by improper pressing canbe avoided; and leveling and roundness correction of the sealing ring can be realized through different correction forces.

Description

technical field [0001] The invention relates to an auxiliary tool for pre-assembling a sealing ring of a butterfly valve and a method thereof. Background technique [0002] like figure 1 As shown, the seal ring 5' of the high-performance butterfly valve is a precise and expensive key seal, and its exterior is a very thin layer of PTFE51', and the upper lip and the lower lip of the seal ring 5' are connected to form an annular groove. An E-type alloy spring 52' is embedded in the annular groove, the tail of the upper lip has an upper fin, and the tail of the lower lip has a lower fin. According to the traditional assembly process, the sealing ring 5' of the high-performance butterfly valve is directly installed into the valve body 1 ' and the butterfly plate 2', then use the pressure plate 3' to press the sealing ring 5', and then use the bolt 4' to tighten evenly. If the sealing ring 5' is installed into the valve body 1' for the first time, there is a slight deviation, an...

AI Technical Summary

Problems solved by technology

If the sealing ring 5' is installed into the valve body 1' for the first time, there is a slight deviation, and the sealing ring 5' is not centered or one side is not flattened, it will affect the sealing effect; if there is a deviation in roundness and flatness, due to this deviation It cannot be found with the naked eye, and can only be found when the tightness is tested after the entire valve is assembled. Significant economic losses to the company and customers, while affecting the time node

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