SAFETY RELIEF VALVES
LESER SAFETY RELIEF VALVES - Type 526
Flanged Steel Pressure Relief Valves According to API 526
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.
LESER SAFETY RELIEF VALVES - Type 441/442
Full Flanged Safety Valves with Flanged Connections
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.
LESER SAFETY RELIEF VALVES - Type 437/459/462
Safety Valves with Threaded Connections
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.
LESER SAFETY RELIEF VALVES - Type 481/483/484/485/488
Safety Valves for Sanitary/Clean Service “48x series”.
LESER has developed five safety valve types, known collectively as the “48x series”. These are designed for protection of systems with special cleanliness requirements ie “Clean Service” : systems for foodstuffs, beverages, pharmaceuticals, cosmetics and technological labs. LESER´s Clean Service Safety Valves are designed and manufactured to highest standards :designed, marked, produced and approved acc. to the requirements of the following regulations (directives, codes,rules and standards).EN ISO 4126-7, EN 12266-1/-2, ASME PTC 25, ASME-CodeSec. II, ASME B 16.34, API Std. 527, API RP 576, AD 2000-Merkblatt A4, AD 2000-Merkblatt HP0, TRD 110, TRD 421
LESER SAFETY RELIEF VALVES - Type 447
Safety Valves for Critical Service Conditions
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 end users, OEM’s and engineering companies worldwide.
LESER SAFETY RELIEF VALVES - Type 310/311
Change-Over Valves
The Change-Over valve is a dual valve configuration that allows maintenance to be performed on the control valve without disrupting high critical process flows as well as an option to divert a process flow without process interruption. Great for pump houses and main supply lines.
LESER SAFETY RELIEF VALVES - PILOT OPERATED SAFETY VALVES
LESER introduces pilot-operated safety valves for oil & gas, petrochemical and pump applications
LESER has introduced a new product series: the Pilot-Operated Safety Valve. The POSV is part of the LESER High Efficiency product group. Pop-action (Series 810) and modulate-action (Series 820) valves are available. The typical application for the pilot-operated safety valve (POSV) are refineries and gas processing plants, compressors in gas pipeline systems and offshore applications. The POSV offers the major advantage in that the process can run close to the set pressure of the valve. This leads to an increase in the capacity utilization and consequently the efficiency of the plant. As a special design feature, the tubing between the pilot valve and the main valve is integrated in the main valve cover, reducing the risk of damage or freezing. The backflow preventer is included as standard. Furthermore, POSVs allow higher external back pressures than spring-loaded safety valves. By means of the harmonized standard DIN EN ISO 4126-4 pilot-operated safety valves, proven in the American market and in the Middle East for nearly 20 years, are now also approved in Europe.
The LESER POSV is available with a short 4 week lead time ex-works.
LESER SAFETY RELIEF VALVES - POSV - PILOT OPERATED SAFETY VALVE
LESER introduces pilot-operated safety valves for oil & gas, petrochemical and pump applications
In August 2010, LESER introduced a new product series: the pilot-operated safety valve. Both pop-action (Series 810) and modulate-action valves (Series 820) are available.
The typical application areas of the pilot-operated safety valve (POSV) are refineries and gas processing plants, compressors in gas pipeline systems and offshore applications. The own-media-controlled POSV offers the advantage that the plant can be run close to the set pressure of the valve. This leads to an increase in the capacity utilization and consequently of the efficiency of the plant. Furthermore, POSVs allow higher external back pressures than spring-loaded safety valves.
By means of the harmonized standard DIN EN ISO 4126-4 pilot-operated safety valves are now also approved in Europe. For decades already their technology has been proven in the American market and in the Middle East.
The LESER POSV will be available with a short 4
week lead time ex works. As a special design feature, the tubing between the pilot valve and the main valve is integrated in the main valve cover, reducing the risk of damage or freezing. The backflow preventer is included as standard.
The POSV is part of the LESER product group High Efficiency. This group unites all products with increase the efficiency and the productivity of the plant.
Series 810 – Pop Action
Series 820 – Modulate Action
Characteristics at a glance:
- Design in compliance with API 526
- Valve sizes from DN 25 to DN 200 (1″ x 2″ to 8″ x 10″)
- Orifice D to T
- Flange pressure ranges according to DIN EN PN 10 – PN 63 (DIN EN), 2,5-63 bar (36-913 psig)
- Flange pressure ranges according to ASME B16.34 CL150 – CL600, 36-1480 psig (2,5-102 bar)
- Approval according to ASME VIII, PED and VdTÜV
- Body materials WCB, CF8M, LCB; 1.0619, 1.4408
Advantages at a glance:
- Tightness guaranteed up to 97% of set pressure – operating pressure can be close to set pressure
- Shorter blowdown for less product loss
- Lower risk of damage due to a reduction of the exterior piping
- Backflow preventer included as standard
- Fast availability
