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Leser Valve

Leser 526

Safety valves from the API product group meet all the requirements of API 526 such as standardized capacity, nominal diameter, and center to face dimensions which offers 100% compatibility.  Because of their robust construction, they are especially suitable for being constructed from special materials such as Duplex, Monel, and Hastelloy.

Technical Specifications

Nominal Diameter at InletDN 25 - DN 200 | 1" - 8"
Orifice1 D 2 - 8 T 10
Actual Orifice Diameter d014 mm - 161.5 mm | 0.551 in - 6.36 in
Actual Orifice Area A0154 mm² - 20,485 mm² | 0.239 in² - 31.75 in²
Pressure0.12 bar - 413.8 bar | 2 psig - 6,000 psig
Temperature (in accordance with ASME)-268 °C bis 538 °C | -450 °F bis 1,000 °F
Body Material1.0619, 1.4408, 1.7357 | SA 216 WCB, SA 351 CF8M, SA 217 WC6, SA 352 LCB, SA 351 CF3M, SA 995 Gr 4A CD3MN (Duplex), SA 494 M35-1 (Monel), SA 494 CX2MW (Hastelloy), SA 494 CW-6MC (Inconel)
Valve ConnectionFlange in accordance with ASME B 16.5 or DIN EN 1092
Bellows Material (optional)INCONEL 625
Load TypeSpring

Leser 441, 442

Safety valves from the High Performance product group offer especially high capacity for their size.  With a large quantity of nominal diameters (DN), pressure ranges and product options, they have proven themselves as a universal safety valve for many applications.

Technical Specifications

Nominal Diameter at InletDN 20 - DN 400 | 3/4" - 16"
Actual Orifice Diameter d018 mm - 295 mm | 0.71 in - 11.61 in
Actual Orifice Area A0254 mm² - 68349 mm² | 0.394 in² - 105.942 in²
Pressure0.1 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 Material0.6025, 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 ConnectionFlange in accordance with DIN EN 1092 or ASME B 16.5
Bellows Material (optional)Stainless steel, elastomer
Load TypeSpring

Leser 437, 459, 462

The product group Compact Performance includes threaded and flanged safety valves with compact dimensions for economical protection of small and midsized capacites. Due to its many orifice diameters, seals, and connections this product group offers a very wide area of application.

Technical Specifications

Nominal Diameter at InletDN 15 - DN 40 | 3/8" - 1 1/2"
OrificeD - F
Actual Orifice Diameter d06 mm - 17,5 mm | 0,236 in - 0,689 in
Actual Orifice Area A028,3 mm² - 241 mm² | 0,044 in² - 0,374 in²
Pressure0,1 bar - 850 bar | 1,5 psig - 12.328 psig
Temperature (iaw DIN EN)-270°C to +450°C | -454°F to +842°F
Material Outlet1.4104, 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 ConnectionThreads iaw 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
Load TypeSpring loaded

Leser 481, 483, 484, 485, 488

Safety valves from the Clean Service product group were specially developed for the food, beverage, and pharmaceutical industries and meet all the relevant standards and regulations such as DIN 11866 or ASME BPE. With a low deadspace inlet area, the unique LESER HyTight assembly, and the optional pneumatic lifting device you have very good cleanability (CIP, SIP). With a large selection of aseptic connections (threaded, flanged, or clamped) the valve can be optimally fitted to different requirements.

Technical Specifications

Nominal Diameter at InletDN 15 - DN 100 | NPS 3/4” - NPS 4”
OrificeD - P
Actual Orifice Diameter d010 mm - 92 mm | 0,394 in - 3,622 in
Actual Orifice Area A078,5 mm² - 6648 mm² | 0,122 in² - 10,304 in²
Pressure0,1 bar - 68 bar | 1,5 psig - 986 psig
Temperature-45 °C to 250 °C | -49 °F to 482 °F
Body Material1.4404, 1.4435 (BN2) | SA 479 316L
Valve ConnectionLarge Selection of Aseptic Connections: Threaded, Flanged, Clamped, Welded
Elastomer BellowsEPDM
Load TypeSpring

Leser 310, 311

Change-over valves from the Best Availability product group increase plant availability.

Change-over Valve Type 320 DN
DN25 - DN 100 | 1" - 4"
Temperature-273°C to +450°C | -459°F to +842°F
Body Material1.0619, 1.4408 |WCB/WCC, LCB, CF8M
Valve ConnectionFlange in accordance with DIN EN 1092-1 and ASME B 16.5
Change-over Valve Type 330
DNDN 25 - DN 100 | 1” - 4”
Temperature-273°C to +450°C | -459°F to +842°F
Body Material1.0619, 1.4408 |WCB/WCC, LCB, CF8M
Valve ConnectionFlange in accordance with DIN EN 1092-1 and ASME B 16.5
Change-over Valve Type 310
DNDN 25 - DN 500 | 1” - 20”
Temperature-270°C bis +538°C | -454 °F bis +1.000 °F
Body Material1.0619, 1.4408, 1.6220 | SA 216 WCB, SA 351 CF8M, SA 216 LCB
Valve ConnectionFlange in accordance with DIN EN 1092-1 and ASME B 16.5
Bursting disc (KUB)
DNDN 25 - DN 150 | 1" - 6"
Temperature-30°C to +550°C | -22°F to +1022°F (depending on the material)
Material Bursting element1.4404, 1.4435, Nickel, Inconel®, Monel®, Hastelloy®, Titan, Tantal | 316L, Nickel, Inconel®, Monel®, Hastelloy®, Titan, Tantal
Material Sealing membran1.4401, Nickel, Inconel®, Monel®, Hastelloy®, Titan, Tantal | 316, Nickel, Inconel®, Monel®, Hastelloy®, Titan, Tantal
Bursting disc holder
DNDN 25 - DN 150 | 1" - 6"
Temperature-30°C to +550°C | -22°F to +1022°F (depending on the material)
Material1.4571, 1.4404, Hastelloy® C4, 1.4571 Tantal coated | 316Ti, 316L, Hastelloy® C4, 316Ti Tantal coated
Valve ConnectionFlange in accordance with DIN EN 1092-1 and ASME B 16.5

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