Maintenance and commissioning of pneumatic butterfly valve
1. The inspection and maintenance plan of the cylinder is to clean the cylinder surface and add oil to the cylinder shaft circlip at ordinary times, and open the cylinder end cover regularly every 6 months to check whether there are sundries and moisture in the cylinder and whether the lubricating grease is in good condition. If the grease is insufficient or dry, the cylinder shall be disassembled for comprehensive maintenance and cleaning before adding grease.
2. Valve body inspection Every six months, check whether the valve body appearance is good, whether the installation flange has leakage, if it is convenient to check whether the valve body seal is good, whether there is wear, whether the valve plate operates flexibly, and whether the valve has foreign matters stuck.

The three-way pneumatic ball valve is a rotary three-way valve with reversing and cutting functions. There are mainly L-shaped and T-shaped structures. The L-shaped three vent pneumatic ball valve is used to switch the flow direction of the medium. It can connect the main pipeline and the other two pipelines separately and switch them at will. T-shaped three vent pneumatic ball valve can be used for the diversion and confluence of three pipelines, and any two of the three pipelines can be connected according to the working conditions. The specific control mode is as follows. In actual use, one three-way valve can replace more than two two-way valves, which not only saves installation space, but also saves costs, making the operation more convenient. Different valve bodies and sealing materials can be selected according to user needs. There are two installation methods: flange and thread. In order to facilitate the use of users, the three vent ball valve can also be equipped with electric or pneumatic actuators, which are electric three vent ball valve and pneumatic three vent ball valve, and can be used for remote automatic control. Performance table of three way pneumatic ball valve: nominal diameter DN (mm) 1520253240506580100125150200 allowable pressure difference (MPa) nominal pressure action range 0~90 valve body form two-part split casting valve body bonnet form integral gland type bolt compression type sealing filler V-type polytetrafluoroethylene filler, impregnated polytetrafluoroethylene asbestos filler, asbestos textile filler Graphite packing connection flange type, threaded type (applicable to 1/2 "~2") valve core type three-way ball valve core flow characteristics approximate quick opening characteristics Leakage Q soft seal: zero leakage; Metal seal: actuator model CHR, 3810R, DZW, HQ, PSQ electric actuator control mode switch in position light (switch two position control), passive contact signal, 1/5K potentiometer, intelligent adjustment (4~20mA analog signal control) according to GB/T4213-92, less than rated KV0.01% basic error ± 1% return difference ± 1% dead zone 1%