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product page - LESER API pressure relief valves


Pressure relief valves according to API 526 with standardized capacities and dimensions

LESER API safety valve. LESER UK
  • Compliance with API 526

  • Diverse selection of high-alloy materials available as standard

  • Longer lifetime due to hardened discs, partly stellited seats and integrated shielding of the optional bellows

  • Single trim: Identical internal parts for S/G/L for cost-effective maintenance

  • LESER Nanotightness: Exceeds the tightness requirements of API 527 by 50%



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

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Valve Types

Type 526 >

Fulfillment of API 526

DN 25 - DN 200 (1" - 8")

Supplementary Loading System (SLS)

Improve the operating characteristics of your safety valve

Same Day Despatch

Technical Specifications for API

Nominal Diameter at Inlet

DN 25 - DN 200 | 1" - 8"

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

Actual Orifice Diameter d₀

14 mm - 161.5 mm | 0.551 in - 6.36 in


0.12 bar - 413.7 bar | 2 psig - 6,000 psi

Temperature (in accordance with DIN EN)

-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)

Valve Connection

Flange in accordance with ASME B 16.5 or DIN EN 1092

Bellows Material (optional)


Load Type


Same-Day Despatch

LESER UK have a selection of API valves in stock and are available for same-day despatch, these valves range from D to L orifice (1" to 3" with CL150 & CL300 Flanges).

LESER API pressure relief valves from stock. same day despatch

The pressure range for these valves is between 0.3 and 51 bar (depending on valve type).

*To qualify for same-day despatch your order must be placed before 2pm Monday - Friday



In our comprehensive download area you will find all necessary documents and detailed information on safety valves you need.

LESER API product brochure
View or Download
Contact LESER UK
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For ALL LESER Safety Valve enquiries In the United Kingdom - Contact LESER UK​

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