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LESER has been a family owned company for the last 190 years. LESER is headquartered in Germany, with a state of the art factory and more than 300 (500)empoyees (worldwide). LESER supplies high quality safety valves all over the world. The company started in Germany in 1818, as a brass foundry and developed a product portfolio of mechanical equipment and machines during the ‘industrial revolution’. Since the 1980′s LESER has been the number one supplier for safety valves in Europe and strengthens this position each year. LESER currently has 7 different locations worldwide and continiues to expand its international presence in an effort to supports its growing customer base

LESER safety valves are manufactured in Germany by LESER and assembled in the US by LESER LLC and through our assembler network.

Extensive stock of LESER products is maintained in the US to guarantee short delivery times.

A full range of spare parts, including springs, discs, nozzles, bellows kits, lifting devices, gaskets etc. are kept in inventory to handle quick shipment requirements.

API

 

 

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ADVANTAGES100% Compatibility to API 526Single Trim (identical internal parts for steam/gas/liquids) allows economical maintenanceQuick delivery (2 – 4 weeks from the factory or next day from local warehouse)Quick delivery for high-alloy materialsLonger valve lifespan due to hardened disc and (partially) stellited seatLonger lifespan of optional bellows through integrated shieldingTECHNICAL SPECIFICATIONS

Nominal Diameter at Inlet           DN 25 – DN 200 | 1″ – 8″

Orifice   1 D 2 – 8 T 10

Actual Orifice Diameter d0          14 mm – 161.5 mm | 0.551 in – 6.36 in

Actual Orifice Area A0    154 mm² – 20,485 mm² | 0.239 in² – 31.75 in²

Pressure               0.12 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 Material   1.0619, 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 Connection             Flange in accordance with ASME B 16.5 or DIN EN 1092

Bellows Material (optional)        INCONEL 625

Load Type             Spring

High Performance

 

 

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ADVANTAGESHigh blow-off capacity in comparison to valve sizeUniversal valve for many applications up to DN 400 / 16″ or 300 bar / 4350 psigProven thousands of timesOutstanding value for the priceSimple and robust constructionSingle trim (identical internal parts for steam/gas/liquid) allows economical maintenanceLarge selection of options for different operating conditions

Quick delivery (2 – 4 weeks from the factory or next day from local warehouse)

Can be equipped with additional supplementary loading system or bursting discs

TECHNICAL SPECIFICATIONS

Nominal Diameter at InletDN 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

Compact Performance

 

 

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ADVANTAGESCompact design with high capacity relative to valve sizeLarge selection of possible connections and seals for different operating conditionsQuick delivery (2 – 4 weeks from the factory or next day from local warehouse)Space-saving horizontal installation possibleSingle Trim (identical internal parts for steam/gas/liquids) allows economical maintenanceLonger lifespan of optional bellows through integrated shieldingTECHNICAL SPECIFICATIONS

Nominal Diameter at Inlet           DN 15 – DN 40 | 3/8″ – 2″

Orifice   D – F | D – F

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 (iaw DIN EN)            -270 °C to 550 °C | -454 °F to 1.022 °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 iaw DIN ISO 228-1, DIN ISO 7-1 / BS 21, ANSI / ASME B1.20.1. Flange iaw DIN EN 1092-1 / DIN 2501.

Bellows Material (optional)        Stainless steel, Elastomer (EPDM)

Load Type             Spring loaded

High Efficiency

 

 

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ADVANTAGESPilot Operated Safety Valve:Piping between the pilot and main valves is integrated into the cover to prevent damage and freezingIntegrated Backflow Preventer as standard partFour week delivery time from the factoryHigher capacity than comparable size with extra orifices

20% less installation space than competitors’ comparable models

Supplementary Loading System:

Higher operating pressures are possible

Closing pressure difference of up to -3 %; opening process is independent of back pressure

Functional test and valve adjustment possible during operation

Max. 0.1 sec. for valve to open completely

TECHNICAL SPECIFICATIONS

Nominal Diameter at Inlet           DN 25 – DN 200 | 1″ – 8″

Orifice   1 D 2 to 8 T+ 10 | 1 D 2 to 8 T+ 10

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 – 63 bar | 36 psig – 1,480 psig

Temperature (iaw DIN EN)            -45 °C to 200 °C | -49°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

Clean Service 

 

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ADVANTAGESEasy cleaning through:Low deadspace ratio (L/D from up to < 0.33)HyTight Assembly: seamless design of internal partsValve is made completely of stainless steel–no cast partsHigh surface quality up to Ra max = 0.375 µm / 15 µinchSurfaces packages according to ASME BPE and DIN 11866Easy Process Integration through:

Cleaning in place (CIP) or Sterilizing in place (SIP) with pneumatic lifting device possible

large selection of aseptic connections

FDA-conformant Elastomere

TECHNICAL SPECIFICATIONS

Nominal Diameter at Inlet           DN 15 – DN 100 | DN 15 – DN 100

Orifice   D – P | D – P

Actual Orifice Diameter d0          10 mm – 92 mm | 0,394 in – 3,622 in

Actual Orifice Area A0    78,5 mm² – 6648 mm² | 0,122 in² – 10,304 in²

Pressure               0,1 bar – 68 bar | 1,5 psig – 986 psig

Temperature     -45 °C to 250 °C | -49 °F to 482 °F

Body Material   1.4404, 1.4435 (BN2) | SA 479 316L

Valve Connection             Large Selection of Aseptic Connections: Threaded, Flanged, Clamped, Welded

Elastomer Bellows           EPDM

Load Type             Spring

Critical Service

 

 

critical-service

ADVANTAGESEasy cleaning through:Low deadspace ratio (L/D from up to < 0.33)HyTight Assembly: seamless design of internal partsValve is made completely of stainless steel–no cast partsHigh surface quality up to Ra max = 0.375 µm / 15 µinch

Surfaces packages according to ASME BPE and DIN 11866

Easy Process Integration through:

Cleaning in place (CIP) or Sterilizing in place (SIP) with pneumatic lifting device possible

large selection of aseptic connections

FDA-conformant Elastomere

TECHNICAL SPECIFICATIONS

Nominal Diameter at Inlet           DN 15 – DN 100 | DN 15 – DN 100

Orifice   D – P | D – P

Actual Orifice Diameter d0          10 mm – 92 mm | 0,394 in – 3,622 in

Actual Orifice Area A0    78,5 mm² – 6648 mm² | 0,122 in² – 10,304 in²

Pressure               0,1 bar – 68 bar | 1,5 psig – 986 psig

Temperature     -45 °C to 250 °C | -49 °F to 482 °F

Body Material   1.4404, 1.4435 (BN2) | SA 479 316L

Valve Connection             Large Selection of Aseptic Connections: Threaded, Flanged, Clamped, Welded

Elastomer Bellows           EPDM

Load Type             Spring

Best Available

 

 

best-avail

ADVANTAGESChange-over Valves:Low pressure loss due to streamlined constructionCompact construction for space saving installationBursting disc (KUB) in combination with safety valves:Tightness until opening

Component-tested safety valve and bursting disc combination: conformity to the 3% criteria–bursting disc does not have to be factored-in during layout.

TECHNICAL SPECIFICATIONS

DN           DN 25 – DN 400 | 1″ – 16″

Temperatur        -270°C to +538°C | -450 °F to +1000 °F

Body Material   1.0619, 1.4408, 1.0305 / 1.0425, 1.4571, 1.4404 | SA 216 WCB, SA 351 CF8M, A105, 316 Ti

Valve Connection             Flange in accordance with DIN EN 1092-1 and ASME B 16.5

Bellows                  Stainless steel (change-over valve)

Spare Parts

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Certificates

Please click on the following link for Leser Certificates

http://www.leser.com/en/services/certificates.html?et_cid=14&et_lid=30&et_sub=Startseite-Navi-top