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Safety & Pressure Relief Valves

Control Valves & Instrumentation

Flame Arresters & Tank Venting Equipment
Safety & Pressure Relief Valves
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Anti Siphon Valve
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Emergency Vent Covers
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End of Line Flame Arresters
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Inline Flame Arresters
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Flanged Safety Relief Valves

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Safety & Pressure Relief Valves
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LESER Type 821/810 Pilot Operated Safety Relief Valve

pressure systems Air pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Sizes
DN25 - DN200 (1" to 8")
Pressure Ratings
2.5 – 426 bar (DIN 1092-1)
36 – 6170 psig (ASME B16.5)
DIN & ANSI Flanged
Materials
WCB, LCB, CF8M
Approvals
ASME Sec. VIII Div. 1, DIN EN ISO 4126-4, AD 2000-Merkblatt A2
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LESER Type 437 Compact Performance Safety Relief Valve (Flanged)

pressure systems Air pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Size
DN15 - DN25 | 1/2" - 1"
(Flanged DIN/ANSI)
Pressure Rating
0.1 - 365 bar | 1.5 - 5294 psig
PN 40 - PN 400 | CL150 - CL2500
Materials
SA 479 430, SA 479 316L
Approvals
PED/ DIN EN ISO 4126-1, AD 2000-Merkblatt A2, ASME Sec. VIII Div. 1, CRN, AQSIQ, EAC
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LESER Type 459 Compact Performance Safety Relief Valve (Flanged)

pressure systems Air pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Sizes
DN15 - DN40 | 1/2" - 2"
(Flanged DIN & ANSI)
Pressure Ratings
0.2 - 250 bar | 2.9 - 3626 psig
Materials
CF8M, WCB, Ductile Gr. 60-40-18, Hastelloy®, Duplex, Super Duplex
Approvals
PED/ DIN EN ISO 4126-1, AD 2000-Merkblatt A2, ASME Sec. VIII Div. 1, CRN, AQSIQ, EAC
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LESER Series 526 API Safety Relief Valve

pressure systems Air pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Sizes
DN25 - DN200 | 1" - 8"
Pressure Ratings
0.1 - 413.8 Bar | 15 - 6000 PSI
ANSI 150# - ANSI 2500#
Materials
WCB, WC6, LCB, CF8M, Duplex, Super Duplex, Hastalloy-C, Monel
Approvals
ASME VII, CRN, PED, EN ISO 4126-1, TÜV SV 100 and AD 2000-Merkblatt A2
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LESER Series 441/442 ANSI High Performance Relief Valve

pressure systems Air pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Sizes
DN25 - DN100 | 1" - 4"
Pressure Ratings
0.1 - 49 bar
ANSI 150# - ANSI 300#
Materials
SA 216 WCB, SA 351 CF8M
Approvals
ASME VIII Div 1, CRN, PED, EN ISO 4126-1,TÜV SV 100 and AD 2000-Merkblatt A2
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LESER Series 447 Critical Service Safety Relief Valve

pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Sizes
DN25 - DN100 | 1" - 4"
Pressure Ratings
0.1 - 16 Bar | 1.45 - 232 PSI
PN16 | ANSI 150#
Temperatures
-85°C to 200°C
Approvals
PED, DIN EN ISO 4126-1, ASME VIII, TÜV SV100 and AD 2000-Merkblatt A2, CRN
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LESER Series 441/442 DIN High Performance Relief Valve

pressure systems Air pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Sizes
DN 20 - DN 200
Pressure Ratings
0.1 - 40 bar
PN 16 - PN 40
Materials
Cast iron, Ductile Gr. 60-40-18, SA 216 WCB, SA 351 CF8M
Approvals
PED, EN ISO 4126-1,TÜV SV 100 and AD 2000-Merkblatt A2
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LESER Type 431/433 Modulate Action Relief Valve

pressure systems Air pressure systems Gas pressure systems Liquid pressure systems Steam
Quick Info
Inlet Connections
DN 15 - DN 150 | 1/2" - 6"
Pressure Rating
0.2 - 40 bar | 2.9 - 580.15 psig
PN 16 - PN 40 | CL150 - CL300
Temperature
PN 16 - PN 40(CL150 - CL300)
PN 16 - PN 40(CL150 - CL300)
Approvals
PED/ DIN EN ISO 4126-1, PED/ AD 2000-Merkblatt A2, AQSIQ, EAC