1. Pneumatic valves include conditioning valves and blocking valves, the effect of the two is different, although the flow rate of the conditioning valve can also be adjusted to 0, but the blocking valve is generally used for urgent blocking, and the valve positioner is generally a cylinder valve. The conditioning valve is with a pneumatic membrane, the kind with a large disc, in addition to being able to regulate, but also to achieve blocking, the only thing in common between the two is that they are powered by gas.
2. The pneumatic shut-off valve is either fully open or fully closed, which is mostly used for protection, while the pneumatic conditioning valve can be opened and closed in any direction, can control the valve to stay at a specified opening, and can adjust the flow rate or pressure. The pneumatic shut-off valve is used to shut down the medium in the pipeline, which requires fast action speed, good shut-off sealing, and a leakage level of 1/100,000.
3. The pneumatic conditioning valve is mainly used for continuous conditioning and control, the signal corresponds to the valve stroke, and is equipped with an electrical valve positioner to receive the control model, according to the continuous 4-20MA signal change, the conditioning valve completes 0-100% full stroke action.
4. The pneumatic shut-off valve only has two directions, open and closed, and is generally equipped with a reversing solenoid valve and a travel switch, the solenoid valve is used to switch the action direction of the pneumatic actuator, and the travel switch is used to feedback the signal to the control system to understand the valve position switch status in real time. The pneumatic conditioning valve can have a certain amount of leakage when closed, while the pneumatic shut-off valve needs to have zero or close to zero leakage
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2. Close the valve and cylinder.
3. Device the cylinder on the valve, the direction of the equipment is parallel or straightened with the valve body, and check whether the screw holes are aligned.
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