Modulate Action
Modulate Action Safety Valve from LESER

Safety valves for low pressure dynamics

  • Low media loss when opening
  • Ideal for thermal expansion
  • Wide range of options available
  • Constant back pressures up to 40 bar / 580 psig
  • Excellent price-performance ratio
  • LESER Nanotightness: Exceeds the tightness requirements of API 527 by 50%

Approvals

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

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

Valve Types

Type 431 / 433

Medium capacities with a large proportional opening range

DN 15 - DN 150 (1/2" - 6")

Type 431 / 433 PN 160

High proportional opening area and high pressure

DN 15 - (1/2" - )

Technical specifications

Nominal Diameter at Inlet
DN 15 - DN 150 | 1/2" - 6"
Actual Orifice Diameter d₀
12 mm - 92 mm | 0.47 in - 3.62 in
Actual Orifice Area A₀
113 mm² - 6648 mm² | 0.175 in² - 10.3 in²
Pressure
0.2 bar - 160 bar | 2.9 psig - 2320.6 psig
Temperature (in accordance with DIN EN)
-270 °C to 450 °C | -454 °F to 842 °F
Body Material
0.6025, 0.7043, 1.0619, 1.4408
Valve Connection
Flange in accordance with DIN EN 1092 or ASME B16.5
Bellows Material (optional)
Stainless steel
Load Type
Spring-loaded
Valvestar from LESER
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Sizing of your safety valve.

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