
2
ART 20C Rev 1
Contents
1. Introduction
2. Technical Data
3. Valve Features
4. Valve Installation
5. Balancing
6. ApprovalsClassication
7. Troubleshooting
8. Warranty
1. Introduction
• Albion Valves (UK) Ltd ART 20C is a Pressure Independent Control Valve (PICV) which can
beusedtoregulatethepressuredifferentialinacircuitandtocontroltheamountofuid
owingthroughit.
• Thankstotheiruniquedesign,PICV’scanperformowregulation,differentialpressure
control and modulation for comfort control.
Flow Regulation
When an electric actuator is not present or the plastic cap has been removed, the valve is
normally open. But if the plastic cap is screwed on, or an electric actuator is installed, the spring
forces the valve to close. The inlet water passes through a modulating control component whose
geometrycanbemodiedbyturningthepre-settingdialtoobtaintherequiredowrateforthe
branch of the system where the valve is installed.
Differential Pressure Control
PICVmaintainssteadyowrateevenwhentherearepressureuctuations.TheDPCbonnet
hastwodifferentpressures.Therstoneisinthepassageconnectingthevalveinlettothe
upper section of the valve (see hydraulic diagram); the second one is at the valve outlet near
the“pa”owrateselectingdevice.Inordertomaintainthesepressuredifferences,theDPC
bonnetobturatorrestrictstheboreofthewateroutlettoachievethepre-setowrate,evenifthe
pressuresinthesystemuctuate.
Modulation
Fullauthority”owratemodulationforroomtemperaturecontrol;Theactuatorperformsthe
modulatingfunctionchangingthesectionofowpassage.
When continuous modulation is carried out, the temperature is kept under control. ART 20C
keeps the same obturator stroke, regardless of the presetting dial position. With continuous
modulation,controlisexcellentevenwithsmallowopeningsandthiseliminatestheon/off
effect.
Constantowisobtainedthroughthevalve,despitepressureuctuations.
Bysimplymeasuringdifferentialpressureacrossthevalve,theowthroughthecartridgeis
obtained as follows: