flow control / equalisation & pressure regulating dampers

Publication GRILLES section 1 SEPT 2005 Part J R Aluminium Grilles supply, exhaust and transfer ventilation systems flow control / equalisation & pressure regulating dampers introduction ordering details type borders fixing finish PRV/I / 32 / SC / SAA / 600 / 600 / 6 width height quantity example: The PRV pressure regulating damper is designed for use either as a differential room pressure controller or as a non return exhaust valve and is suitable for vertical mounting in partitions and walls. The units can be sized to regulate room pressures against a design air flow rate, but can also be adjusted after installation using the balance weights to give a range of operating pressures. The PRV can also be used in conjunction with other Brooke Air products such as weather louvres for external applications or any of the grille range where architectural requirements need to be considered. Pressure regulating dampers are available in sizes ranging from 150mm x 150mm up to a maximum of 1000mm x 1000mm in a single section. Larger sizes can be supplied with mullion sections. sizes finish For all additional available options, border styles, fixings, finishes and plenums see document PART L options Standard finish is satin anodised aluminium - SAA type fixings PRV Standard fixing method is by countersunk screw through the flange - SC Pressure regulating dampers PRESSURE REGULATING DAMPERS 2 97 AIR Flow Nom Size +45 32 5 Nom Size -19 32 PRV/I OLF & PRV/E Nom Duct and Grille Size Adjustable blade weights Exhaust PRV/E AIR Flow Fully open 67 Fully open 88 lnlet Louvre assembly PRV DIMENSIONS Pressure regulating dampers R 3 Pressure regulating dampers AIR FLOW RATE NOMINAL WIDTH (mm) NOMINAL HEIGHT (mm) MAXIMUM DIFFERENTIAL PRESSURE (Pa) (WEIGHTED BLADES) l/s m3/hr 50 40 30 20 50 40 30 20 200 300 400 500 600 800 1000 200 400 300 1200 2000 1000 500 200 100 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 50 300 200 500 600 1500 150 1500 10 100 30 DIFFERENTIAL PRESSURE (Pa) (UNWEIGHTED BLADES) PIVOT LINE 800 1000 1200 70 10 100 SELECTION NOMOGRAM 4 Pressure regulating dampers selection example Select a PRV Damper with and without Blade Weights to give a differential pressure of 20Pa at an air flow rate of 150l/s. UNWEIGHTED = 600mm x 500mm WEIGHTED = 800mm x 600mm SELECTION EXAMPLE R 5 introduction ordering details The OB type opposed blade damper is offered as a standard method of flow control or equalisation and is suitable for use with the majority of grilles and diffusers within the Brooke Air range. Dampers are normally supplied ready fixed to the air terminal when specified, but can also be supplied separately for duct mounted applications. OB Dampers are available in sizes ranging from 100mm x 50mm to a maximum of 1200mm x 450mm. Sizes larger than this are supplied in multiple sections. Grille and diffuser mounted dampers should be included with the grille order adding the designation OB to the grille type. Duct or plenum mounted dampers (type OB/DM) should be ordered separately, stating the nominal duct dimensions. When ordering, state the type of operator required; OB or OBL (standard key or lever), OB/RAO (right angle operator for quadrant), or OB/FFL (self closing with fusible fire link). The standard method of adjustment is by a removable key through the grille face, but lever and right angle type operators, together with fusible fire links, can also be supplied. Where necessary, the dampers incorporate end closure plates to provide an effective seal in the closed position. type OB sizes Grille and duct dampers OPPOSED BLADE DAMPERS 6 25 7mm SQ. Right angle operator (Type OB/RAO) OB - DAMPER End closure plate Lever Operator (Type OBL) 52 15 70 DIMENSIONS Grille and duct dampers R 7 introduction ordering details The SV type straight

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