Specification
The Double Regulating Valve, with its integral fixed orifice design, offers an accuracy of ± 5% on all settings, for precise
flow regulation and measurement.
They are Y-pattern globe valves having characterised throttling disc tending towards equal percentage performance.
Integral square edged entrance orifice plate and P84 insertion test points fitted.
Double regulating feature allows valve opening to be set with an Allen key.
Operation of the valve is by means of the Microset handwheel.
The Double Regulating feature allows the valve to be used for isolation and to be re-opened to its pre-set position to
maintain required flow rate.

End Connection
• Sizes 1” to 2” taper threaded to BS EN 10226-2 (iso 7-1) formerly BS 21.
• Sizes 1/2” & 3/4” (DN15 & DN20) to BS 2779 (ISO 228) parallel.
• Adaptor kits for use with copper tube also available.
• Also available threaded to ANSI B1.20.1AT (Article number D931AT / D933AT / D934AT)

Application
D933 size 1/2” low flow FODRV combines the functions of regulation and flow measurement in a unit of high authority
making it particularly suitable for low flow applications in the range of 0.03 to 0.07 l/s. D934 size 1/2” ultra low flow
FODRV combines the functions of regulation and flow measurement in a unit of high authority making it particularly
suitable for ultra low flow applications in the range of 0.016 to 0.04 ls.