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3-5403 PRESSURE SAFETY RELIEF VALVES

API 520 Series
1″x2″ up to 10″x12″
up to ANSI 2500# (with limitations depending on DN)
CS, Cr-Mo, SS

The new series VSU 3-5403 universal pressure
safety relief valves represents the third step in evolution
of the first series 3-5401 dated 1989. The new
series geometry is moulded by demanding experimental
tests campaign supported by CFD and FEM
analyses. Experimental tests, both on compressible
(air) and incompressible (water) fluids, with and
without back pressure, were performed according to
PED requirements (standard ISO 4126-1 and working
draft ISO 4126-11).
With respect to previous series VSU 3-5402, the
new series still provides high quality overpressure
protection with the same valve on gas, steam, vapour,
liquid and two-phase mixtures services and, in
addition, offers dramatic improvement of discharge
flow rates under back pressure conditions.

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