According to the different guiding modes of the valve core, the regulating mechanism is divided into top guiding, top bottom guiding, valve rod guiding, valve seat guiding and cage guiding. The valve core of the top guide regulating mechanism is guided by the upper valve cover or a guide shaft in the valve body; The valve core of the top and bottom guide regulating mechanism is oriented by the guide shafts of the upper and lower valve covers at the same time; The valve rod guide is that a guide shaft on the valve cover is aligned with the center of the valve seat ring, and the shaft sleeve guides the valve rod; Seat guide is used in small flow control valve, which guides through the valve seat; The valve core of the cage guide regulating mechanism and the cage form a sleeve structure. In the whole travel range, the valve core contacts the inner surface of the cage, and there is a cage hole on the cage. When the valve core moves, the flow area of the cage L changes. The valve cage is self aligned with the valve cover and valve seat, so as to realize the guiding of the valve core.

Understanding the characteristics of pneumatic on-off butterfly valve can enrich and comprehensively understand its normal use and daily maintenance, so as to carry out good and effective maintenance and ensure its use effect.