As industrial development has progressed, the demands for safety have continuously increased. Step by step, LESER has developed its safety valves to reflect the state of the art and extended its product range to provide solutions for all sectors of industry.

Full lift safety valves open rapidly within an overpressure of 5% to the full design lift.

They are used in particular for vapours and gases, in applications where the maximum mass flow has to be discharged rapidly. LESER types 441/442, 4444 are suitable for almost any industrial application, and are worldwide one of the best selling spring-loaded flange type safety valves up to a pressure rating of PN 40 / PR #300.

API 526 is a purchase specification in which the nominal diameters, flange pressure ratings, centre to face dimensions, flow areas, body and spring materials and their service limits are stipulated for "API safety valves"

API safety valves are used worldwide in the petrochemical industry, both on- and off-shore. These applications are characterised by standardised plants, blow-down systems and long pipework sections. The capacities of API safety valves are relatively low in relation to their nominal diameters.

The LESER type 526 combines the requirements of the API standards and the ASME Code with the tried and tested service reliability of the LESER range.

Safety valves with threaded connections are used for handling small and medium mass flows.

The LESER threaded connection safety valves are notable for their wide range of set pressures, compact overall dimensions and low weight.

LESER has developed five safety valve types, known collectively as the "48x series", for the protection of systems with special cleanliness requirements ("clean service": systems for foodstuffs, beverages, pharmaceuticals and cosmetics). The properties common to the "48x series" are:

• low dead space
• high surface quality
• free of crevices
• CIP, SIP and COP capability

In chemical plants, critical service conditions and media may occur which place special demands on the design of safety valves, e.g.

• Highly corrosive media
• Highly toxic media
• High back pressures

Relief valves open in proportion to the pressure rise. They are used wherever normally expected mass flows are very small and the medium loss is to be kept as low as possible (e.g. thermal expansion).

Safety relief valves are ideal relief valves for medium mass flows. Their large proportional range leads to consistent functioning and relief of pressure peaks, particulary with liquids. Both proportional and safety relief valves are characterised by particularly stable operation.

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