The slam-shut is a safety valve that quickly shuts off the supply when the pressure goes outside the permissible limits.
OPSO
Over Pressure Shut-Off means closing when the downstream pressure rises above the specified setpoint.
UPSO
Under Pressure Shut-Off means closing when the pressure drops below a specific limit, where this function is used.
Why it is independent protection
The slam-shut can protect the downstream network if the main regulator fails.
Reset
After activation, a simple reset cannot be performed without inspection. First, the reason why the pressure exceeded the limit must be identified.
