Electronic Relief Valve

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Technical Data
½ - 12 “
Pressure Classes

ASME / ANSI Class 150 – 4500

Materials of Construction

Carbon steel (A105, A216 WCB) – standard
Alloy steel (F22, F91, A217 WC9, A217 C12A) – standard
Stainless steel (316H, A351 CF8M) – standard
Duplex steel exotic alloys
Other materials available upon request

In Compliance

ASME B16.34
Nuclear ASME III Class 1, 2 and 3
Nuclear Safety Related – 10CFR50 Appendix B

End Connections

Buttweld – standard
Raised-face flange – standard
Other end connections available upon request


Various control packages available integral isolation

Pilot Operated Relief

Consider the safety rating, productivity value and cost savings of electronic relief valve (ERV) – the relief valve whose standard blowdown and set pressure is accurate to 1/10% of 1 psi. ValvTechnologies’ ERV is the perfect combination of zero-leakage isolation valve plus the electronic controls needed to monitor and regulate system pressure. Use it in vital applications, where its ASME Sec. 1, V-stamp certification is required; or in process-critical over-pressure protection applications for extra safety assurance: ERV is the above-standard benchmark.

For more information, please contact:

Julie Bodine

Director of Global Marketing & Communications

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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.

  • Zero-leakage guarantee comes standard
  • Eliminate the need for costly field welding with optional integral isolation valve
  • Flexible ½ to 12 inch sizing in ASME/ANSI Class 150 – 4500
  • Specially engineered for easy adaptation to existing control suites
  • Multiple actuator relief options – air, spring, hydraulic, AC/DC electric, failsafe and failsafe last position – extend applicability throughout plant or site

Remove panel

Weatherproof control box

Lockable switch

Drip pans/exhaust pans


DSC signal input



Additional isolation valve

Four year zero-leakage guarantee in steam and water applications.