Safety / Relief Valve · Industrial Valves
HOERBIGER Wien GmbH of Austria holds DNV SE Type Approval certificate TAM00000SU, issued on 2025-09-11 and valid until 2028-01-23, covering the Sigma ESR series from Sigma 98 ESR to Sigma 266 ESR. DNV lists the product type as Crankcase Explosion Relief Valve, in the category Machinery Components. Valves of this kind are meant to relieve pressure from an engine crankcase in the event of an internal explosion.
Crankcase explosion relief valves of this kind are typically mounted on the crankcase doors or covers of large diesel engines, where they open to release excess pressure and then close again.
Listed in the DNV Approval Finder at the time we recorded it. The certificate is issued by DNV, not by us; check its current status at DNV.
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