What must be done to the 40-27G filter/separator valve to get it to operate again after it has closed due to high differential pressure?

When a 40-27G filter/separator valve automatically closes due to high differential pressure, it is an indication of a blockage or restriction in the flow path that has caused an unsafe condition for the operation of the valve. To restore its functionality, the correct procedure involves manually resetting the pressure-differential shutoff, which is denoted as CDHS-3A in the system.

Manually resetting the pressure-differential shutoff is necessary because this device monitors the pressure differential across the filter. When it detects a pressure difference that exceeds a certain threshold, it shuts off the valve to prevent damage, contamination, or hazardous conditions. By resetting CDHS-3A, you are effectively clearing the fault condition that triggered the closure, allowing the filter/separator valve to resume normal operation once the underlying cause of the high differential pressure is addressed.

In contrast, options like resetting the control panel or cleaning the receiving strainer may not directly resolve the issue that caused the valve to shut off. While maintaining the system and ensuring all components are clean is important, it is the reset of the pressure differential shutoff that is the critical step to immediately enable operation of the filter/separator valve again. Manually resetting the 40-28G or