Overview fine small pneumatic O type insulation off (adjustable) valve by the pneumatic piston actuator and mezzanine whole cast body composed of a cylindrical spool through holes global sphere. The product is designed as a spring-like seat rebound effect has formed a flexible two-way valve, ensure the reliability of sealing the ball while resilience media pressure and the upstream end of the flexible structure and increased the downstream end of the valve seat seal . Flexible structure and automatically compensates seat wear and temperature and pressure variations. Increase the service life. The products are easy disassembly and maintenance, appearance neat, compact, good insulation effect and so on. It can be widely applied to crystallize and viscous fluids. And to meet the various needs of the insulation media applications. As with wax, oil and other bituminous more controlled media, to prevent crystallization of the media, to ensure the efficient operation of the automatic control system.