Overpressure Protection
Operator/Monitor setup
This is one of the best forms of overpressure protection. It uses two regulators that work together as one system. One is the operator and one is the monitor. If the operator fails, the monitor kicks in to keep the system up and running close to your setpoint.
Relief Valve
Relief valves can be internal or external to a regulator. In the event of a failure, these will open and allow excess gas to escape the system out the vent instead of over-pressurising your system.
Slam Shut Valve
A slam shut valve will engage upon regulator failure. This will trigger at its setpoint and shut down the line. Typically, these require manual reset.
P289 Back Pressure Regulator
The Type P289 Back Pressure Regulator functions as a high flow relief valve with an adjustable set point. The P289 can be used in place of a standard relief valve to provide protection against over pressurization in the downstream system. The design of a large diaphragm area and a pitot tube booster allow the valve to respond quickly and relieve the excessive pressure smoothly, especially in low-pressure settings.
P1808 Relief Valve
The P1808 pilot-operated relief valve or back pressure regulator is used in gas or liquid service to maintain pressure on oil and gas separators, and in pressure relief applications in gas distribution systems. The function of the P1808 is controlled by the type of pilot installed on the unit. A PL82 series pilot regulator is used in back pressure applications, and only bleeds when repositioning the main valve. A PL82B series regulator is used in pressure relief applications, and exhausts the entire time the inlet pressure is above the set pressure. This allows the unit to achieve wide-open flow more easily. The unit controls pressures from 3 to 125 PSIG (0.21 to 8.6 Bar), and the set pressure can be adjusted for individual requirements by the adjusting screw on the pilot.