Combined circular groove for butterfly valve seat of molecular sieve

Abstract

The invention discloses a combined circular groove for a butterfly valve seat of a molecular sieve. The butterfly valve seat is a fluororubber O-shaped ring valve seat made from an abrasion-proof material; a sunken circular groove is reserved on the inner surface of a circular passageway of the valve seat; the O-shaped ring valve seat is arranged in the circular groove; the arched surface of the circular groove consists of two arcs, wherein the radius of each arc is R and a space between the centers of circles of the arcs is H; the valve seat on one side of the circular groove is screwed with a pressure ring; the root part of the pressure ring is provided with the sunken arched surface; and the arched surface and the circular groove form the combined circular groove. The combined circular groove is a special product applied to the strict working conditions of the cutting-off and control of air in an air separation system, changes the structural form of the conventional butterfly valve seat, realizes the 'piston ring effect', prolongs the service life of a valve, ensures two-way sealing and improves the performance level of the valve, along with simple structure, low cost and easy machining.

Description

technical field [0001] The invention relates to a combined ring groove for installing a valve seat, in particular to a combined ring groove suitable for the valve seat of a molecular sieve butterfly valve in an air separation device. Background technique [0002] The cut-off valve designed for the control of air in the air separation system is a special product used in severe working conditions. Air containing water vapor, carbon dioxide, hydrocarbons and other tiny solid particles must be removed before the air can be cooled and separated. The effective way to remove it is to use molecular sieve adsorption. Generally, two adsorption dryers are used in parallel, one works, and the other can be regenerated at the same time. Frequent alternate work and regeneration are used to ensure continuous operation of the equipment. Therefore, butterfly valves are required not only to have a long life, but also to achieve bidirectional sealing. Ordinary soft-sealed butterfly valves ...

AI Technical Summary

Problems solved by technology

Due to processing errors and structural reasons, ordinary soft-sealed butterfly valves have a short service life and are prone to leakage, which cannot meet the needs of working conditions.

[0003] Butterfly valves are divided into neutral butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves, and triple eccentric butterfly valves according to their structure. Among them, the triple eccentric butterfly valve has the best performance, but cannot achieve bidirectional sealing. Therefore, the traditional solution is to use double eccentric butterfly valves to reduce The wear of the valve plate and the valve seat improves the mutual sealing performance; however, the valve seat of the traditional butterfly valve is made of polytetrafluoroethylene material, the structure of the valve seat is complex, and it is difficult to process and shape. The material is greatly affected by temperature and humidity, and the forming accuracy of the valve seat The requirements are relatively high, even if the error is large in different weathers in the same area, not only the processing cost is high, but the most important thing is that the universal type and batch production of the valve seat are limited

At the same time, if the "piston ring benefit" of the valve seat is realized and the performance of the valve is improved, the structure is more complicated, the manufacturing cost is high, and the performance is not stable

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