Proportional Full-Lift Safety Valve
A proportional full-lift safety valve is a flanged safety valve in which the disc lifts proportionally to overpressure as the pressure adjustment value is exceeded, and the discharge quantity increases with pressure. Thanks to its proportional opening characteristic, it delivers smooth and precise pressure relief, especially in liquid (water, hot water, thermal oil) lines and pump outlets without shock.
It is offered in sizes from DN15 to DN100 with EN-JL1040 ductile iron PN16 (300 °C), 1.0619 cast steel PN40 (450 °C) and 1.4408 (AISI 316) stainless steel PN40 (400 °C) body options. The seat is AISI 316Ti and the disc is AISI 420 stainless steel. Open or closed cap and lifting mechanism options are available.
Advantages
- Proportional, smooth opening with pressure
- Characteristic suited to liquid lines
- Ductile iron, cast steel and stainless options
- Open / closed cap and lifting mechanism
Applications
- Hot water and high-temperature water systems
- Pump outlets and bypass lines
- Thermal oil systems
- Pressure vessels and heat exchangers
Technical Specifications
| Nominal diameter | DN15 – DN100 |
|---|---|
| Pressure class | PN16 (ductile iron) |
| PN40 (cast steel, stainless | PN40 (cast steel, stainless) |
| Max. temperature | 300 °C / 450 °C / 400 °C (depending on body) |
| Connection | Flanged inlet and outlet |
| Cap | Open or closed, with lifting mechanism |
Materials
| Body and cap | Ductile iron, cast steel or AISI 316 stainless |
|---|---|
| Seat | AISI 316Ti stainless steel |
| Disc | AISI 420 stainless steel |
| Spring | 51CrV4 spring steel (AISI 302 in stainless) |
Why ORFA?
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