Strong pressure impacts can damage closed PICVs.
  1. The PICVs must be commissioned with the manual control knob or actuator correctly fitted.
  1. The PICVs must be open when flushing or pressure testing the system. Flush only on correct flow direction.
  1. Differential pressure Δpmax across the valves’s control path is not allowed to exceed 600 kPa

Manual control

When turning the manual control knob in counterclockwise direction or manually operating the actuator, the valve opens. The actuator closes the valve. The valves are supplied fully open. The manual knob is not designed for permanent manual operation.