High Efficiency
High Efficiency Safety Valve from LESER

Solutions for high plant efficiency

Pilot operated safety valves

  • Highest blow-off capacity of all series
  • Tightness right up to set pressure
  • Operating pressures up to 96% of the set pressure
  • Back pressures up to 70% of the set pressure
  • Backflow preventer integrated as a standard component 
  • Integrated Piping prevents damage and freezing

Supplementary Loading System

Equipment that enables the following safety valve characteristics:

  • Tightness right up to set pressure
  • Operating pressures up to 97% of the set pressure 
  • Low loss of medium due to short opening times
  • Function test and valve adjustment possible during operation
  • Suitable for all media temperatures

Approvals

LESER High Efficiency safety valves are designed, marked, produced and approved according to the requirements of the following regulations:

  • LESER CE Approvel
  • LESER ASME Approvel
  • LESER EAC Approvel
  • LESER Chinese TS Approvel

Valve Types

Type 811

Pilot operated / Pop Action

DN 25 - DN 200 (1" - 8")

Type 821

Pilot operated / Modulate Action

DN 25 - DN 200 (1" - 8")

Type 702, 712, 714, 731

Supplementary Loading System (additional option for safety valves)

Technical data pilot operated safety valves

Nominal Diameter at Inlet
DN 25 - DN 200 | 1" - 8"
Actual Orifice Diameter d₀
11 mm - 180 mm | 0.433 in - 7.087 in
Actual Orifice Area A₀
95 mm² - 25,446.9 mm² | 0.147 in² - 39.443 in²
Pressure
2.5 bar - 426 bar | 36 psig - 6170 psig
Temperature (in accordance with DIN EN)
-48 °C to 200 °C | -54.4°F to 392°F
Body Material
1.0619, 1.4408 | SA 352 LCB, SA 216 WCB, SA 351 CF8M
Valve Connection
Flange in accordance with DIN EN 1092, ASME B 16.5 or JIS 2220
Load Type
Medium controlled

Technical data supplementary loading system

Bauart
Pneumatically, electropneumatically
Max. Betriebsdruck
315 bar
Anbau an Type
441 up to DN 400, 457 up to DN 150, 526 up to DN 200
Load Type
Additionally loaded (compressed air) 4 - 10 bar
Antriebsgröße
G1 - 3S
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