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Spring Operated Relief Valves

Leser Relief Vavles

Leser is one of the world’s leading manufacturers of Safety Relief Valves. The company is headquartered in Germany, and all manufacturing takes place in Germany. Standard factory delivery is 4 weeks, and a large inventory is based in Charlotte, North Carolina for quick shipment.

We are proud of our products, and deliveries, and our prices. We gladly publicize our prices, because they are typically 20-30% below our principal competitors prices. Please follow the link to our 2012 Price Book and see for yourself.

Leser provides a full line of pressure relief valves, as shown below. Leser is the leading supplier in much of the world and is supported by a broad of authorized repair centers and assemblers.


Flanged Safety Relief Valves API Series

Series 526 · Flanged Safety Relief Valves · API Series 
LESER's API series 526 is a spring loaded pressure relief valve series, specially designed and manufactured to API 526 and approved according to ASME (Sec. VIII, Div. 1) the Canadian CRN, the European PED standard, the German AD 2000-Merkblatt A2 and those of many other countries, covering requirements from end-users, OEM´ s and engineering companies worldwide, thus allowing immediate replacement.

LESER's API series 526 has been optimized in close cooperation with plant engineers and service specialists, simplifying design with fewer components for less down time, fewer spare parts and lower maintenance costs. Extensive testing at the LESER ASME-certified test lab together with up to date manufacturing processes ensure the reliability of this state of the art product.

Threaded Safety Relief Valves

Series 437, 459 · Threaded Safety Relief Valves · Spring Loaded  
LESER's compact performance valves are spring loaded safety relief valves of specially compact design, developed in close cooperation with plant engineers and service specialists to protect special processes and installations against overpressure. Extensive testing at the LESER ASME certified test lab together with up to date manufacturing processes ensure the reliability of these state of the art products.

LESER's compact performance valves are designed and manufactured to highest standards and compliant with and approved according to ASME (Sec. VIII, Div. 1), the Canadian CRN, the European PED standard (CE), the German AD 2000- Merkblatt A2 and those of many other countries, covering requirements from end-users, OEM's and engineering companies worldwide.

Flanged Safety Relief Valves · Spring Loaded  

Series 441 · Flanged Safety Relief Valves · Spring Loaded  
LESER's high performance valves are spring loaded safety relief valves with specially broad application range, developed in close cooperation with plant engineers and service specialists. Series 441 serves for protection of processes and equipment. Series 441 ANSI exceeds API capacities for a given valve size. Series 441 XXL provides for valves sizes and capacities beyond the limits of the API 526.

LESER´s high performance valves are designed and manufactured to highest standards, approved according to ASME (Sec. VIII, Div. 1), the Canadian CRN, the European PED standard (CE), the German AD 2000- A2 and those of many other countries, covering requirements from endusers, OEM´s and engineering companies worldwide.

PTFE-Lined Safety Relief Valves

Series 447 · PTFE-Lined Safety Relief Valves 
LESER’s critical service valves are spring loaded safety relief valves developed in close cooperation with plant engineers and service specialists to protect highly corrosive processes and installations against inadmissible overpressure. Compared to standard full nozzle safety relief valves with high alloy trim, Type 447 provides for a very cost effective solution.

LESER’s critical service valves are designed and manufactured to highest standards, compliant with and approved according to ASME (Sec. VIII, Div. 1), the Canadian CRN, the European PED standard (CE), the German AD 2000-Merkblatt A2 and those of many other countries, covering requirements from endusers, OEM’s and engineering companies worldwide.


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