POSV Pilot Operated Safety Valve

LESER introduces pilot-operated safety valves for oil & gas, petrochemical and pump applications



In August 2010, LESER will introduce 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.

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 VdT‹V
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

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