Berluto · Pressure Regulators
Berluto DRV 840 mbar pressure reducing valve, flanged, stainless steel
Spring-loaded diaphragm pressure reducing valve for the mbar range in stainless steel 1.4408 with PN 40 flanges DN 15 to DN 50, inlet 0.5 to 10 bar, outlet 7 to 500 mbar in four spring ranges, for air and neutral gases, ATEX version available.
The DRV 840 series is the flanged version of Berluto’s mbar reducer, DN 15 to DN 50 with PN 40 flanges. A spring-loaded large diaphragm under a domed bonnet holds outlet pressures from 7 to 500 mbar from an inlet between 0.5 and 10 bar. The reduction ratio is not limited and a pulse line can be connected for control on the downstream pressure, which suits tank blanketing and other low-pressure gas duties. It is intended for air and neutral gases only.
Four spring ranges are available: DRV 843 for 7 to 100 mbar and DRV 844 for 30 to 500 mbar with a Kvs of 2.5 to 3.0 m³/h, and DRV 847 for 50 to 200 mbar and DRV 848 for 150 to 500 mbar with a larger Kvs of 4.3 to 16.3 m³/h. The valve is installed horizontally with the bonnet pointing up. Body and bonnet are stainless steel 1.4408 with 1.4404 inner parts.
EPDM / PTFE or FKM / PTFE diaphragms cover −30 °C to +180 °C. An ATEX version with EPDM per directive 2014/34/EU and DIN EN ISO 80079-36 is rated −10 °C to +80 °C. The threaded counterpart is the DRV 740.
Selection data we need
Gas and temperature, inlet pressure range, required outlet pressure in mbar, flow rate or Kvs, nominal size and flange standard, ATEX zone if applicable.
Applications
- Tank blanketing with nitrogen or other inert gas
- Low-pressure gas supply to burners, analysers and laboratories
- Air and neutral gases needing a stable outlet in the mbar range
- Potentially explosive atmospheres (ATEX version)
