Leser Safety valves for all industrial applications:

• High capacities in comparison to nominal size
• Wide range of nominal sizes
• Wide range of options available
• Excellent price-performance ratio
• LESER Nanotightness: Exceeds the tightness requirements of API 527 by 50%

Industries

• Chemical 
• Petrochemical 
• Energy 
• Technical Gases 
• LNG and LPG 
• Pharmaceutical 
• Food and Beverage 
• Ship Building 
• General industries 

Approvals

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

Valve Types

• Type 441, 442 DIN 
• DIN Flange
• DN 20 - DN 200 (3/4" - 8")

• Type 441, 442 ANSI 
• ANSI Flange
• DN 25 - DN 100 (1" - 4")

• Type 441, 442 XXL 
• High nominal diameter
• DN 250 - DN 400 (10" -16")

• Type 444 DIN 
• Deep-drawn body
• DN 25 - DN 80 (1" - 3")

• Type 444 ANSI 
• Deep-drawn body
• DN 25 - DN 80 (1" - 3")

• Type 441, 442 Full nozzle DIN 
• Nozzle
• DN 25 - DN 50 (1" - 2") 

• Type 441, 442 Full nozzle ANSI 
• Nozzle
• DN 25 - DN 100 (1" - 4") 

• Type 455, 456 
• High pressure with seat
• DN 25 - DN 100 (1" - 4") 

• Type 457, 458 
• High pressure with seat
• DN 25 - DN 150 (1" - 6") 

Technical data High Perfomance

• Nominal Diameter at Inlet
  • DN 20 - DN 400 | 3/4" - 16"
• Actual Orifice Diameter d₀
  • 18 mm - 295 mm | 0.71 in - 11.61 in
• Actual Orifice Area A₀
  • 254 mm² - 68349 mm² | 0.394 in² - 105.942 in²
• Pressure
  • 0.1 bar - 300 bar | 1.5 psig - 4,350 psig
• Temperature (in accordance with DIN EN)
  • -270 °C to 550 °C | -454 °F to 1,022 °F
• Body Material
  • 0.6025, 0.7043, 1.0619, 1.4408, 1.0460 / 1.0425, 1.4571, 1.4404, 1.4581, 1.7357 | Cast iron, Ductile Gr. 60-40-18, SA 216 WCB, SA 351 CF8M, carbon steel, 316Ti, SA 479 316L, SA 351 CF10M , SA 217 WC6
• Valve Connection
  • Flange in accordance with DIN EN 1092 or ASME B 16.5
• Bellows Material (optional)
  • Stainless steel, elastomer
• Load Type
  • Spring-loaded

Click on the link below to download the catalogues

• Type 441 DIN - Packed lever H4 - Closed bonnet - Conventional design
• Type 441 Full nozzle ANSI - Packed lever H4 - Closed bonnet - Conventional design
• Type 441 Full nozzle DIN - Packed lever H4 - Closed bonnet - Conventional design
• Type 442 DIN - Plain lever H3 - Open bonnet - Conventional design
• Type 442 Full nozzle ANSI - Plain lever H3 - Open bonnet - Conventional design
• Type 442 Full nozzle DIN - Plain lever H3 - Open bonnet - Conventional design
• Type 444 DIN - Packed lever H4 - Closed bonnet - Conventional design
• Type 456 - Packed lever H4 - Closed bonnet - Conventional design
• Type 458 - Packed lever H4 - Closed bonnet - Conventional design