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This paper discuss an new type servo valve, aiming at two main defects of performance of globe valve which are commonly used in mine safety cabins in China, in order to bring up a better solution to replace old valves. On one hand, most of globe valves are manual ball valves whose oxygen content cannot be accurately controlled and can only be estimated by human respiratory sense, ended in large errors[1]. On the other hand, although in market there is oxygen-concentration test equipment, the separation of valve components and manual control switch, leads to complicated procedures and management inconvenience. For solving these problems, an innovative valve mechanical structure is designed, with its servo system bringing up. The proportional valve measures the room oxygen concentration in real time, closed-loop controlling of electric valve-opening, so that the concentration of oxygen in the ambient air is maintained at a desired level. The principle of this implementation is that an explosion-proof motor drives the roller cam to convert valve core into reciprocating linear motion, separating O-ring and valve body end-face to control valve core achieving the opening and closing functions. Since there is no relative motion between O-ring and valve body, it definitely avoids problems of uncontrollable particles caused by abrasion and ensures a high cleanliness of flow path. In addition, electric servo valve controls the precise oxygen concentration, automatically. Compared with manual air supply valve, this valve has advantages of high cleanliness, reliable sealing, easy assembly, maintenance, and automation. It provides a new technical approach for design of special industrial and mining value.

A High Degree of Cleanliness of the Electric Air Supply Valve Design