Enviro Valve Inc. has designed a revolutionary pressure relief device to handle the stringent overpressure requirement for today's process systems. The unique design of the Enviro-Valve enables the valve to remain in a state of equilibrium until an overpressure occurs. The Enviro-Valve is offered in either a manual reset or automatic reset. The Enviro-Valve can be operated up to 98% of the set pressure, while maintaining a bubble tight seal. The pressure relieving device offers full line size flow capacity. The Enviro-Valve is a quick opening device and will deliver full line capacity flow within 4 milliseconds. Unlike other devices, the Enviro-Valve works equally well in all phases of service, including multi-phases. The Enviro-Valve's set pressure is not affected by back pressure because the Enviro-Valve is not a pressure differential device. The heart of the Enviro-Valve is the revolutionary "Buckling Gland Technology". This allows for unmatched repeatability and a truly fail-safe pressure relieving device. The Enviro-Valve has a wide range of pressures from1psig to 4000 psig and is offered in a wide range of configurations. The Enviro-Valve does not require stocking of replacement parts like a pin valve or rupture disc. The Enviro-Valve is offered in most materials and can even be offered in a non-metallic configuration.