DS981 DS982 DS984 Moto Balance (FODRV)

User Manual: DS981- DS982- DS984 MotoBalance (FODRV)

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INSTALLATION, OPERATING
AND MAINTENANCE INSTRUCTIONS

Motobalance valves
MOTORISED FIXED ORIFICE DOUBLE REGULATING VALVES - DS981 | DS983 | DS984

• The Motobalance valve offers actuated balancing
solutions for heating and cooling applications.
• Its unique fixed orifice design gives greater accuracy
of flow measurement.
• Operation of the valve is by means of
motorised actuator.
• MotoBalance is based on the proven
Crane D931 FODRV.
• Y-pattern globe valve.
• Integral square edged entrance orifice plates and
P84 insertion test points.
• Double regulating feature allows valve to be manually set.

INSTALLATION
Preparation
The flow direction must comply with the arrow cast on the valve body. The valve may be installed in
any position other than with the actuator pointing vertically downwards. Please refer to the actuator
installation instructions. Ensure fluid is clean, free from debris and non-degrading to EPDM. To
ensure flow measurement accuracy, it is essential that the piping on the inlet and outlet is straight
and has a minimum length equivalent to 5 diameters at inlet and 2 diameters at outlet.

End connections:
Sizes 1/2 & 3/4" DN15 & DN20, ISO 228-1 parallel

Jointing:
No thread jointing materials must be allowed to protrude inside the bore. For compression
connections to copper tube, the tightening torque on the compression nut should not be so great as
to cause crushing on the tube wall.

Tube cutting:
After cutting and threading steel tube, the end must be deburred or reamed before fitting to the flow
measurement device. With copper tube, especially when cutting is carried out by roller cutters, the
end must be deburred and reamed to tube bore dimension before fitting to the flow measurement
device. Failure to carry out this procedure may lead to errors in flow measurement.

OPERATION
Protective cap:
The protective cap can be used to operate the valve during the construction period, i.e. when no
actuator available but the cap must not be used for permanent shut-off of the valve against
system pressure.

Regulation and flow measurement:
Flow regulation is achieved by adjusting the stem position with the key supplied until the required
flowrate is obtained, as derived from the 'signal' measured across the pressure test valves. The set
position can then be recorded from the dial. Valves have a coloured dial to represent the following:
DS981 - White
1/2” flow range of 0.061 to 0.132 l/s.
3/4” flow range of 0.131 to 0.289 l/s.
DS983 - Yellow
1/2” flow range of 0.03 to 0.07 l/s.
DS984 - Green
1/2” flow range of 0.016 to 0.04 l/s.
Flow charts are available for all valve sizes.

Actuator:
Suitable for use with all manufacturers actuators meeting the following
Specification:
• M30 x 1.5 connecting thread

• 24v/230v on/off OR 24v/230v modulating actuator
• Actuators need a force of 90 Newtons against a
differential pressure of 1.2 bar to close the valve

11
.
NO 8 -+
DI CL MIN 0.4
ME OS A
NS IN L
IO G
N

• Suitable for use with either

M3
TH 0 X
RE 1.5
AD

B

Nominal stroke length is 4.0mm
Nominal closing dimension of 11.5mm

Pressure temperature rating:
Maximum static pressure: 16 bar
Maximum differential pressure: 1.2 bar
Maximum working temperature: 120°C
Minimum working temperature: -20°C

CRANE HOUSE
EPSILON TERRACE,
WEST ROAD, IPSWICH
SUFFOLK IP3 9FJ

TELEPHONE: +44 (0)1473 277300
FAX: +44 (0)1473 277301
EMAIL: enquiries@cranefs.com
www.cranefs.com

Every effort has been made to ensure that the information contained in this
publication is accurate at the time of publishing. Crane Ltd assumes no responsibility
or liability for typographical errors or omissions or for any misinterpretation of the
information within the publication and reserves the right to change without notice.

www.cranebsu.com

CFS_MBV_0911
IOM_OED13425R_REV 1

A
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