LESER

Safety valves are the whole business at LESER, which traces its origins to Hamburg in 1818. The range runs from small threaded valves to API 526 flanged valves and pilot-operated designs. Seven Star LLC lists LESER safety relief valves across these product groups and sources them, with the manufacturer’s documentation, for pressure equipment in Oman.

LESER safety valve product groups

LESER sorts its valves into named groups, and the type number identifies the design:

• API: Type 526 flanged safety relief valves to API 526 dimensions
• High Performance: Type 441/442 flanged valves, and Type 455/456 and 457/458 for high pressure
• Compact Performance: threaded Types 437, 459 and 462
• High Efficiency: pilot-operated safety valves such as the pop action Type 811
• Critical Service: Types 447 and 449 for corrosive media, the 447 with PTFE-lined wetted parts
• Clean Service: hygienic valves for food and pharmaceutical plants

Modulate Action valves and change-over valves, which let one of two safety valves be taken offline, complete the listing.

Where LESER safety valves are used

LESER safety valves protect pressure vessels, heat exchangers, boilers, compressors, pumps and piping against overpressure in oil and gas, refining, petrochemical, power, industrial gas, food and pharmaceutical plants throughout the GCC. Spring-loaded valves are the standard choice. Pilot-operated valves are selected where operating pressure runs close to set pressure or back pressure is high.

Ordering LESER valves: what we need

A safety valve is always built to a set pressure, so a type number alone cannot be quoted. Please send the nameplate data of the existing valve (type, article or job number, serial number, set pressure, orifice) or a full data sheet: medium and its state, set pressure, operating and relieving temperature, back pressure, required capacity, inlet and outlet size and rating, body and trim material, design code (ASME Section VIII or PED) and options such as bellows, lifting lever or sour service materials. We verify the selection against LESER documentation and supply the manufacturer’s certificates on request.