Compact Performance Threaded Safety Valves
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Compact Performance Safety Relief Valves Sries 437 Series 459 CL The-Safety-Valve.com

LESER Safety Valves for every industrial application Product Range API High Performance High Efficiency Clean Service H2SO4 HNO3 NH3 HCL Critical Service Modulate Action Best Availability Series 437 Type 437 Type 438 Type 439 Series 459 Type 459 Type 459 HDD Type 462 Type 462 HDD Compact Performance

General Orifice diameter d0 6, 10 mm Set pressure 0.1 – 365 bar, 1.5 – 5294 psig Sealing metal to metal and soft seal (sealing plate) Type 437 Orifice diameter d0 10 mm Set pressure 5 – 180 bar, 72.5 – 2611 psig O-ring soft seal Type 438 Orifice diameter d0 10 mm Set pressure 0.1 – 16 bar, 1.5 – 232 psig Vulcanized soft seal Type 439 Options Series 437 Orifice diameter d0 9, 13, 17.5 mm Set pressure 0.2 – 250 bar, 2.9 – 3626 psig Sealing metal to metal and soft seal (sealing plate) Type 459 Orifice diameter d0 6, 9, 13 mm Set pressure 0.2 – 850 bar, 2.9 – 12328 psig Sealing stellited metal...

Contents Applications, General design features 00/02 Valve finder 00/03 Valve selection 00/05 How to use: Signs and symbols 00/07 How to use: Determination of coefficient 00/08 of discharge Kdr/áw How to use: Capacity sheets 00/09 LESER Effective Orifice LEOS/G 00/11 LESER Effective Orifice LEOL Overview Chapter/Page Materials • Available designs 01/02 • Available designs – materials 01/03 How to order • Numbering system 01/04 • Article numbers 01/06 Dimensions and weights • Metric Units [Threaded connection] 01/08 [Flanged connection] 01/09 • US Units [Threaded connection] 01/10 [Flanged...

Contents Materials • Available designs 05/02 • Available designs – materials 05/03 How to order • Numbering system 05/04 • Article numbers 05/06 Dimensions and weights • Metric Units [Threaded connection] 05/08 [Flanged connection] 05/09 • US Units [Threaded connection] 05/10 [Flanged connection] 05/11 Pressure temperature ratings • Metric Units 05/12 • US Units 05/13 Order information – Spare parts 05/14 Available options 05/16 Approvals 05/17 Capacities • Metric Units [Steam, Air, Water] 05/18 • US Units [Steam, Air, Water] 05/19 Determination of coefficient of discharge Kdr/áw 05/20 Type...

General Information 00/01 LWN 481.01-E LESER – Compact Performance Safety Valves This product group stands for Compact dimensions with high capacity relative to the safety valve size Great variety of threaded and flanged connections Wide pressure range LESER´s Compact Performance Safety Valves • Are designed to meet all industrial applications up to F orifice • Open rapidly with an overpressure of max. 5 % (Series 459) resp. 10 % (Series 437) to the full design lift. • Have a maximum blowdown of minus 10 % for steam / gas service and minus 20 % for liquid service. • Are developed in a close...

General Applications LESER – Compact Performance Safety Valves offer ultimate protection against unallowable overpressures in all applications for steam, gases and liquids where smaller capacities are required. Typical applications for LESER Compact Performance Safety Valves are: • Air / gas compressors and pumps • Technical gases and CO2 plants • Cylinder filling stations • Chemical equipment and piping • Pressure vessels and piping systems containing gas, air, liquid or steam • LPG / LNG terminals, carriers etc. • Cryogenic systems and oxygen applications • Thermal relief • High pressure...

Valve finder 00/03 LWN 481.01-E General How to find the right Product Group No No No No No Critical Service Clean Service Best Availability Mediumcontrolled Changeover valve Bursting disc Spring loaded Safety Valves High operating to set pressure ratio, high backpressure or low total height? Clean Service application? Critical Service / highly corrosive application? API specified application? Additional components beyond safety valves Steam, gas and liquid application with low capacity in relation to valve size? High Performance API Compact Performance Modulate Action High Efficiency...

Valve selection 00/05 LWN 481.01-E General Valve size Type 437 437 438 438 439 Long version Long version Actual Orifice diameter d0 [mm] – 6 – – – Actual Orifice diameter d0 [inch] – 0.236 – – – Actual Orifice diameter d0 [mm] 10 10 10 10 10 Actual Orifice diameter d0 [inch] 0.394 0.394 0.394 0.394 0.394 Sealing Type Metal seat Metal seat O-ring sealing O-ring sealing Vulcanized soft seal Set pressure Metric units min. p [bar] 0.1 0.1 93 68 5 5 93 68 0.1 0.1 max. p [bar] 93 68 365 330 93 68 180 180 16 16 US units min. p [psig] 1.5 1.5 1349 986 72.5 72.5 1349 986 1.5 1.5 max. p [psig] 1348...

Valve selection LWN 481.01-E 00/06 General Valve size Type 4593 459 HDD 462 462 HDD Actual Orifice diameter d0 [mm] 9 6 9 9 Actual Orifice diameter d0 [inch] 0.354 0.236 0.354 0.354 Actual Orifice diameter d0 [mm] 13 9 13 13 Actual Orifice diameter d0 [inch] 0.512 0.354 0.512 0.512 Actual Orifice diameter d0 [mm] 17.5 13 17.5 – Actual Orifice diameter d0 [inch] 0.689 0.512 0.689 – Sealing Type Metal seat Metal seat O-ring sealing O-ring sealing Capacity LEOS/G d0 6 [mm] – 0.036 – – LEOS/G d0 9 [mm] 0.082 0.082 0.082 0.082 LEOS/G d0 13 [mm] 0.171 0.171 0.171 0.171 LEOS/G d0 17,5 [mm] 0310 –...

How to use 00/07 LWN 481.01-E General Flange dimensions of LESER Series 437, 459 exceed flange dimension as mentioned in ASME / ANSI B16.5 and DIN EN 1092. This exceed is in accordance with API Standard 526, Section 2.4. Dimensions: “For some valve designs, the inlet raised face height may substantially exceed the nominal dimension specified in ASME / ANSI B16.5 (and DIN EN 1092). Consult the manufacturer for exact dimension.” The reason for this exceed is: - height of nozzle placed in the inlet of valve - the slip on flange construction The flange standard shows the same drilling, facing...