ERV - Electronic Relief Valve

Protection of conventional and nuclear main steam safety relief systems ValvTechnologies’ ERV fulfills the need for a zero-leakage, pilot-operated relief valve.
The ERV package combines ValvTechnologies’ zero-leakage isolation valve with electronic controls to monitor and regulate system pressure. Whether in a capacity relieving function requiring the ASME V-Stamp or simply an overpressure protection application, the ERV provides reliable protection for standard safety valves in many industries.
Size : 1/2" – 12”
ANSI/ASME Class 150 - 4500 ANSI/ASME Section I Capacity Certified Integral isolation valve available Easily adapted to existing controls
Four-year, zero-leakage guarantee

ValvTechnologies’ ERV fulfills the need for a zero-leakage, pilot-operated relief valve. The ERV package combines ValvTechnologies’ zero-leakage isolation valve with electronic controls to monitor and regulate system pressure. Whether in a capacity relieving function requiring the ASME V-Stamp or simply an overpressure protection application, the ERV provides reliable protection for standard safety valves in many industries. ValvTechnologies can also provide an integral isolation valve, eliminating the need for costly field welding. Standard blowdown and set pressure is accurate to 1/1000.

1. Integral metal seat. With our patented HVOF RiTech® coating process, the integral seat in ValvTechnologies’ rotary operating valves are resistant from the attack of abrasive magnetite or ferrous oxides in the steam flow.
2. Body seal ring. ValvTechnologies employs a field proven seal ring technology to ensure sealing under all operating conditions, up to 1400°F. The body seal ring is loaded at a pressure higher than 20,000 psi. In addition, valves sized three inch and above contain a secondary Grafoil seal to further guarantee reliability
3. Patented coating process. The sealing surfaces are overlaid with tungsten or chromium carbide using our exclusive HVOF RiTech® process. These surfaces have a hardness of 68 – 72 Rc to allow long periods of operation in the most severe conditions.
4. Live-loaded gland area. The V Series gland packing design features a four stud, live-loaded assembly designed for heavy industrial applications. The packing material is high purity Grafoil® surrounded by carbon fiber / Inconel anti-extrusion rings. The six Bellville springs (per stud) provide constant load pressure through extreme thermal shocks and prevent wear leaks in high cycle service.
5. Blow-out proof stem design utilizes a one piece, hard-faced, blow-out proof stem that is inserted through the inside of the body cavity eliminating the possibility of blow-out through the gland area.
6. End cap. ValvTechnologies design utilizes a end cap with a diffuser outlet with optional end connections.