Compact Performance
Compact Performance Safety Valve from 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%

Approvals

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

  • LESER CE Approvel
  • LESER ASME Approvel
  • LESER EAC Approvel
  • LESER Chinese TS Approvel

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 specifications

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 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, Inconel
Load Type
Spring-loaded
Valvestar from LESER
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