Slam-Shut Safety Valve (Gas Over-Pressure Cut-Off, Class 150-600)
Supreme Valves' Slam-Shut Safety Valve is an automated safety cut-off valve designed to protect downstream gas piping and regulators from dangerous over-pressure or under-pressure conditions. Operating completely without external power, it snaps shut in milliseconds when the monitored line pressure crosses preset safety boundaries.
Key Applications
Industrial Applications & Engineering Problem Solving
The Engineering Challenge
Gas distribution stations and industrial burners can suffer catastrophic failures if upstream regulators fail, sending high-pressure gas downstream. This over-pressure spike can rupture low-pressure pipes, blow out industrial burners, and cause massive fires or gas explosions. Direct power loss to safety systems during emergencies can render electronic shutoff valves useless.
The Supreme Valves Engineering Solution
Our Slam-Shut Safety Valve operates completely without external power, utilizing a highly sensitive internal diaphragm to monitor gas pressure. If pressure spikes or drops past preset limits, it trips a high-tension mechanical trigger, snapping the valve closed in less than 100 milliseconds. Re-opening requires manual intervention, ensuring safety loops cannot be reset until the system fault is solved.
Operational Use Cases & Scenarios
District Pressure Regulator Station Protection
Operational Challenge: Protecting low-pressure municipal gas pipelines feeding residential meters from upstream high-pressure regulation failure.
Engineering Benefit: Failsafe, power-independent over-pressure cut-off snaps shut in <100ms, preventing pipeline ruptures.
Gas Burner Main Fuel Supply Loop
Operational Challenge: Cutting off gas supply immediately if downstream burner flame-out causes an under-pressure condition or line break.
Engineering Benefit: OPCO/UPCO dual triggers monitor both high-pressure spikes and low-pressure line breaks, preventing explosive gas accumulation.
Technical Specifications
Material of Construction (MOC)
Purchase Options
Features & Benefits
Zero External Power Required
Completely self-operated safety device utilizing the process gas pressure to trip the mechanical trigger.
Ultra-Fast Cut-Off
Snaps shut in less than 100 milliseconds using an internal high-tension spring system.
Dual-Boundary Trip
Monitors both high over-pressure spikes and sudden downstream gas line breaks (under-pressure trip).
Safe Manual Reset
Cannot be reopened automatically. Requires an engineer to manually reset the trigger mechanism, ensuring the system leak is resolved first.
Frequently Asked Questions
Q What triggers a slam-shut valve?
The valve has a sensing line connected to the downstream pipe. If the pressure exceeds the high setpoint (due to a failed regulator) or falls below the low setpoint (due to a line break), it trips the release mechanism and snaps shut.
Q How fast does it close?
It closes in under 100ms. This prevents high-pressure surges from reaching and rupturing low-pressure commercial meters and pipelines.
Q Is it a gas pressure regulator?
No. A regulator modulates flow to maintain pressure. A slam-shut valve is a safety-barrier that is either 100% open or 100% closed, acting as a fuse.