LESER 439

LESER 439 safety valve

The LESER 4394.2892 is a spring-loaded safety relief valve from the LESER Type 439 Compact Performance series, designed to protect vessels, piping, and systems from overpressure. The valve opens automatically when system pressure exceeds its set point, discharging the excess medium safely to prevent equipment damage.
This model features a soft-seated design for improved tightness at low set pressures, making it suitable for industrial and process applications requiring precise and reliable pressure protection. Its compact construction supports both panel and line installation in gas or compatible fluid systems.

Key Feature:
- Spring-loaded safety valve for overpressure protection
- Effective flow area: 78.5 mm²
- Set pressure: 2 barg (factory or field adjustable)
- Soft vulcanized seal for enhanced tightness near set pressure
- Compact, robust stainless steel construction (316L)
- Suitable for gases, vapors, and compatible fluids
- Designed according to PED, EN ISO 4126-1, AD 2000, and other international standards
- Reliable and repeatable opening behavior, suitable for industrial and process applications

Specification:
- Operating Data:
Model: LESER 4394.2892
Series: Type 439 Compact Performance
Maximum Set Pressure: Up to 16 bar (specific unit set at 2 barg)
Flow Area: 78.5 mm²
Operating Temperature: −45 °C to +150 °C
- Mechanical & Materials:
Body Material: Stainless Steel 316L (1.4404)
Seal Material: Soft vulcanized elastomer
Connection: 1/2 NPT
Mounting Position: Vertical installation recommended
Approvals: PED / DIN EN ISO 4126, AD 2000, CE marked

Typical applications:
Low-pressure vessels and piping systems
Compressed air and gas systems
Process equipment protection in chemical, petrochemical, and industrial applications
Skid-mounted or panel-mounted installations
Gas supply to analyzers and sampling systems
Any application requiring reliable low-pressure overpressure protection