Before installation, remove the protective covers from both flange ends and flush/clean the valve while it is in the fully open position. Conduct a complete functional test using the specified signals (electrical or pneumatic) before installing the valve in the pipeline. Flush the pipeline to remove any residual impurities before connecting the valve. Do not use the valve's actuator as a lifting point during installation to avoid damaging the actuator or its accessories. These valves may be installed in either horizontal or vertical pipeline sections. Ensure the pipeline near the installation point does not sag or bear external loads; use pipe brackets or supports to correct any pipeline misalignment. After connecting to the pipeline, tighten the flange bolts in a crisscross pattern using the specified torque.
Confirm that the pipeline and valve have been flushed before operation. Valve operation is driven by the input signal to the actuator, which rotates the stem: a 1/4 turn (90°) in the forward direction closes the valve, while a 1/4 turn (90°) in the reverse direction opens it. The valve is open when the actuator's directional indicator arrow is parallel to the pipeline and closed when the arrow is perpendicular to the pipeline.
Before use, flush the pipeline and the valve's flow path with water to prevent residual iron filings or other debris from entering the valve body cavity. Before servicing the ball valve, close the upstream shut-off valve, open the ball valve to be serviced, and fully release the internal pressure within the valve body. If the pneumatic flanged ball valve fails to open or close completely, check for insufficient air supply pressure, malfunctions in the positioner, or debris trapped between the sealing surfaces [11]. Air leaks in the pneumatic flanged ball valve may be caused by leaks in the air service unit (FRL), leaks from the cylinder exhaust port, or scratches on the cylinder's inner wall.