Why does the pneumatic sanitary butterfly valve fail to act? Pneumatic ball valve connection code: 1 indicates internal thread, 4 indicates flange type, 6 indicates welding, 7 indicates wafer type; Structural code of pneumatic ball valve: floating type: 1 means through flow, 2 means Y-shaped tee, 4 means L-shaped tee, 5 means T-shaped tee; Fixed type: 0 means hemispherical straight through, 6 means four-way flow channel, 7 means straight through flow to, 8 means L-shaped tee, 9 means Y-shaped tee;
④ Limit switch: it transmits the signal of valve switch position remotely. There are mechanical type, proximity type and inductive type.
