LESER

LESER is a premier German manufacturer specializing exclusively in spring-loaded safety valves for overpressure protection across the process industries. Founded in 1818 and based in Hamburg, Germany, with its main plant in Hohenwestedt, LESER produces over 150,000 safety valves per year and offers thousands of configurations covering the API 526, DIN, and ASME product families, including the Compact Performance, High Performance, High Efficiency, Critical Service, and Clean Service series. LESER safety valves protect pressure vessels, piping systems, boilers, and process equipment in oil and gas, petrochemical, chemical, power generation, LNG, marine, and pharmaceutical applications, with materials and trims engineered for sour service, cryogenic media, and high-temperature steam. As a trusted supplier of LESER safety valves in Oman and the wider GCC, Seven Star LLC gives plant engineers and EPC contractors direct access to genuine LESER products, certified documentation, and application support, helping ensure regulatory compliance and dependable overpressure protection for critical assets.

About LESER: Company and Product Range

LESER is a German manufacturer that has specialized in safety valves since 1970. The business goes back to 16 March 1818, when Georg Wittmann set up a brass foundry in Hamburg; his adopted sons, the Leser brothers, continued it after 1870. LESER is based in Hamburg, and production was moved to Hohenwestedt in 1943. The company states that it produces over 150,000 safety valves per year.

LESER organizes its range into product groups such as API, High Performance, High Efficiency, Compact Performance, Modulate Action, Clean Service and Critical Service. Models listed here include the Type 526 API flanged valve, Type 441/442, the threaded Types 437, 459 and 462, Type 483 for hygienic service and Type 310 change-over valves. They protect pressure vessels, boilers and piping in oil and gas, chemical, power, food and pharmaceutical plants.

Browse LESER products by category: Safety Relief Valves.

LESER

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LESER Product Range at Seven Star

Browse LESER products we supply by category:

Safety Relief Valves (14)

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Frequently Asked Questions

What types of safety valves does LESER manufacture?

LESER manufactures spring-loaded direct-acting and pilot-operated safety relief valves, including the API 526 Compact Performance and High Performance series, the High Efficiency pilot-operated range, Critical Service valves with PTFE lining, and Clean Service valves for hygienic applications.

Are LESER safety valves suitable for sour gas and high-temperature steam service?

Yes. LESER offers NACE MR0175/ISO 15156-compliant trims for sour gas duty and high-temperature bellows and cooling-fin configurations for steam and thermal oil service, along with cryogenic-rated valves for LNG and industrial gas applications.

Can LESER valves be supplied with third-party certification for GCC projects?

Yes, LESER safety valves can be supplied with full material test certificates, API and PED certification, and third-party witness testing documentation required for oil, gas, and petrochemical projects across Oman and the GCC.

What industries commonly use LESER safety valves?

LESER safety valves are widely used in oil and gas production, refining, petrochemical processing, power generation, LNG and LPG handling, marine and shipbuilding, and pharmaceutical and food processing plants where overpressure protection is critical.

Does Seven Star LLC supply genuine LESER valves in Oman?

Yes, Seven Star LLC is a trusted supplier of genuine LESER safety valves in Oman, providing sourcing, technical selection support, and certified documentation for plants across Muscat, Sohar, and Salalah.