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www.hattersley.com

• Designed and manufactured under quality managementsystems in accordance with BS EN ISO 9001-2008

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H_D

PCV_08_2009

F U T U R E V A L V E T E C H N O L O G Y

Maintains a consistent performanceUse with variable speed pumpswithin HVAC systemsEnhances efficiencyReduces energy consumptionSimplifies the commissioning processEasily adjusted to meet future conditions

HEATING

VENTILATION

AIR CON

WATER

Differential PressureControl Valves

FM311ISO 9001

Stabilises Differential Pressure in heatingand chilled variable flow systems

New

The Company reserve the right to amend any product without notice.

DPCV ACCESSORIES

Hattersley DPCV 04

DPCV Accessories

DPCV installed across flow and return pipework of a single terminal unit to maintain high 2-port control valve authority.

CompanionValve

Load

DPCV

ImpulseTube

2 PortControlValve

DPCV

P2

P1

CompanionValve

Load

ImpulseTube

2 PortControlValve

EXAMPLE FLOW CONFIGURATION (F300) EXAMPLE RETURN CONFIGURATION (R300)

MALE & FEMALE TAILPIECESHattersley offers additional male and femaleBSP taper threaded couplings, giving thecontractors a variety of options on installationand enabling a fast and easy connection tothe pipe work.

ISOLATING BALL VALVEInstalling a ball valve in the impulse tubeallows isolation of the tube during flushing.This helps to ensure that the tube is keptfree from debris.

COMPANION VALVEHattersley highly recommends the use of a companionvalve as a part of the circuit. As well as providingstandard flow measuring and regulating features, thecompanion valve has an integral tapping point for animpulse tube to link the valve and the DPCV.

Additional impulse tubes are available on request.

TYPICAL INSTALLATION LAYOUTS

Flow ConfigurationTop View

Return ConfigurationTop View

105 80

2

Impulse TubeConnection

Impulse TubeConnection

3

1

4

2

3

1

4

A

B

119 119

Differential Pressure Control ValvesFeatures and Benefits

01 Hattersley DPCV Hattersley DPCV 03

MATERIALS

Item Description Material

1 Body Bronze BSEN1982 (CC491K)

2 Bonnet Bronze BSEN1982 (CC491K)

3 Chamber Bronze BSEN1982 (CC491K)

4 Adjuster Nylon Grade PA6

INT Stem / Piston Stainless Steel BSEN10088 - 1: 2005

INT Diaphragm Rubber EPM

INT O-Ring Seals Rubber EPDM

Hattersley DPCV 02

DIMENSIONS AND WEIGHTS

F300 Flow R300 Return

PN16 | DPCV

DIMENSIONAL DRAWINGS

Extremely efficient, the DPCV is set to a maximum differentialpressure limit, under dynamic balancing conditions, whichensures flow cannot exceed a desired rate. It therefore helpsreduce energy consumption, the risk of noise and simplifiesthe commissioning process.

The EPM diaphragm, which separates the upper and lowerchamber of the valve, in combination with the balanced pistonis key to stabilising differential pressure within the system. Therubber-seated piston, controlled by the diaphragm, closes thevalve on rising differential pressure and opens it on fallingdifferential pressure. The valve will continue to move in thisway until equilibrium of pressure is achieved. This ensuresthe maximum desired flow rates or differential pressures arenot exceeded.

Installing a DPCV in a system to control differential pressure,can also help to minimise the risk of noise.

Installing a DPCV in a circuit ensures the system remainsbalanced, independent from any changes in other areas ofthe circuit, which greatly simplifies the balancing andcommissioning procedure. It also maintains the controlauthority of the 2 port control valve.

Available in sizes from DN15 to DN50, in flow and returnconfigurations, the DPCV operates at a temperature range of-10˚C to 100˚C and is PN16 rated. The pressure differentialis set on installation, across a 20 to 100 kPa range, and canbe easily adjusted on commissioning as required by thechanging conditions.

Hattersley offers other accessories which are highlyrecommended in order to achieve an optimum performance.See page 4 for details.

To meet the growing use of variable speed pumps for HVAC

applications, Hattersley has introduced a range of Differential

Pressure Control Valves (DPCV) specifically aimed at optimising

system performance.

See diagrams for item numbersINT denotes an internal component not visible on these drawings

Size A (mm) B (mm) End Connection Weight (kg)

DN15 90 175 3/4” BSP Parallel Male 2.34

DN20 96 175 1” BSP Parallel Male 2.39

DN25 114 185 1 1/4” BSP Parallel Male 2.62

DN32 132.5 190 1 1/2” BSP Parallel Male 2.76

DN40 150.5 195 1 3/4” BSP Parallel Male 3.07

DN50 184 205 2 3/8” BSP Parallel Male 3.57

Male and female tailpieces are available -please contact Hattersley

Flow ConfigurationFront View

Flow & Return ConfigurationSide View

Return ConfigurationFront View

Adjuster

Easily sets differential pressureacross a 20-100 kPa range,and can be adjusted tomaintain desired flow rates ordifferential pressure, matchingcircuit conditions.

Integral Impulse Tube*

Pressure from before theload is linked to the upperchamber (flow mountedconfiguration only).

Lower Chamber*

The lower pressure, after the load, istransmitted to the lower chamber.

Rubber Seated Piston

Closes on rising differentialpressure and opens onfalling differential pressure.Maintains the desiredsystem flow rate.

Diaphragm

Separates and balances the upper andlower chambers and therefore thedifferential pressure. The Diaphragmreacts quickly to fluctuation in pressure.

Upper Chamber*

The higher pressure,before the load, istransmitted to theupper chamber.

Impulse TubeAlongside the DPCV, an impulsetube is supplied as standard. It is

essential to the valve’s performanceas it taps pressure from the other

side of the circuit and links it to thevalve’s chambers.

Flow Configuration (F300)shown as an example

*Please see page 4 for typical installation layouts

Male Threaded Ends

Male and female adaptersare available so that theDPCV can be placed inany standard pipe work.See page 4 for details.The valve is easilyreplaceable withoutdisturbing thesurrounding pipe work.

Body

PN16 rated. Compactdesign allows for installationin limited spaces.