Double regulating valve
Energy Efficient Pumping Systems, a design guide (BG 12/2011), written by Chris Parsloe and published by BSRIA in 2011, suggests that a double regulating valve (DRV): ‘…enables manual regulation of flow rate. Once regulated, the valve can be locked in its set position and subsequently used for isolation. On re-opening, the valve will only open as far as its locked position.’
The BSRIA guide to 'Commissioning Air Systems' (BG 49/2024), written by by Keith Barker and published by BSRIA in March 2024, explains how to commission ducted air distribution systems in buildings. It was originally published in 2013, then 2015 with the latest update in 2024.In the guide it defines 'regulating' as: 'The process of adjusting the fluid flow rates in a distribution system to achieve the design flow rates within the tolerances specified by the designer'
--BSRIA
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