Inspection standard picture of pneumatic pull rod butterfly valve maintenance? Pneumatic butterfly valves are generally not used alone. They are generally equipped with various accessories, such as solenoid valves, air source processing triplets, limit switches, positioners, control boxes, etc., which are intended for local control and remote centralized control. Valve switches can be controlled in the control room, without the need to go to the site or high altitude and dangerous areas for manual control, It saves human resources, time and security to a large extent.
、 1. Allowable value of valve stem diameter When selecting electric device for lifting valve, attention shall be paid to the allowable valve stem diameter, which must be less than this value. In addition, for the multi turn electric device, the requirements for the height of the valve stem cover (related to the valve diameter) should also be put forward when selecting it. Rotary stem valves may not be equipped with valve stem covers.
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