Leser Safety valves with compact dimensions and high connection variety

• Flanged and threaded valves with a wide range of options
• Small installation space with simultaneous horizontal installation option
• Bellows version available
• Set pressures up to 850 barg / 12325 psig
• LESER Nanotightness: Exceeds the tightness requirements of API 527 by 50%

Industries

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

Approvals

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

Valve Types

• Type 437 
  • Metal to metal or sealing plate
  • G 3/8 - 1 (NPT 1/2" - 1")
• Type 438 
  • O-ring disc
  • G 3/8 - 1 (NPT 1/2" - 1")
• Type 439 
  • Vulcanized soft seal disc
  • G 3/8 - 1 (NPT 1/2" - 1")
• Type 459 
  • Metal to metal or sealing plate
  • 1/2" - 1 1/2" (1/2" - 1 1/2")
• Type 459 HDD 
  • Metal to metal or sealing plate, massive construction for high pressure
  • 1/2" - 1“ (1/2" - 1“ )
• Type 462 
  • O-ring disc
  • 1/2" - 1 1/2" (1/2" - 1 1/2")
• Type 462 HDD 
  • O-ring disc, massive construction for high pressure
  • 1/2" - 1“ (1/2" - 1“ )

Technical data Compact Perfomance

• Nominal Diameter at Inlet
  • DN 15 - DN 40 | 3/8" - 1 1/2"
• Actual Orifice Diameter d₀
  • 6 mm - 17.5 mm | 0.236 in - 0.689 in
• Actual Orifice Area A₀
  • 28.3 mm² - 241 mm² | 0.044 in² - 0.374 in²
• Pressure
  • 0.1 bar - 850 bar | 1.5 psig - 12.328 psig
• Temperature (in accordance with DIN EN)
  • -270°C to +450°C | -454°F to +842°F
• Body Material
  • 1.4104, 1.4404, 0.7043, 1.0619, 1.4408 | SA 479 430, SA 479 316L, Ductile Gr. 60-40-18, SA 216 WCB, SA 351 CF8M
• Valve Connection
  • Threads DIN ISO 228-1, DIN ISO 7-1 / BS 21, ANSI / ASME B1.20.1. / Flange iaw DIN EN 1092-1 / DIN 2501., ASME B16.5
• Bellows Material (optional)
  • Stainless steel, Elastomer (EPDM), Hastelloy, Inconel
• Load Type
  • Spring-loaded