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Siemens Building Technologies
Technical Information associated with Guidance
for Control Valves in HVAC Applications
General Guidance for the Use of Control Valves
in HVAC Applications
This information is intended as a general guide
for the application of HVAC control valves. Please consult the
manufacturers relevant data sheets for detailed specifications.
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Control valves must be suitable for the
medium & operating pressure
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Modulating type control valves must not be
used where tight shutoff is required
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Control valves can be manufactured with +/-
10% tolerance on the kvs value. They should not be used as a
reference for balancing purposes
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“Mixing valves” have 2 inlets & 1 outlet
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“Diverting valves” have 1 inlet & 2 outlets
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Most manufacturers valves are “mixing valves”
& when used in a diverting application must be placed in the
return<
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Most valves will work when installed in any
position (see relevant manufacturers details), however they
should be installed upright as far as possible. Installing
valves upside down should be avoided as any water leakage will
run into the electrical actuator & may result in damage
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Valves should be installed with sufficient
room available for removing the actuator & complete valves for
inspection purposes. In addition isolating valves & quick
disconnect fittings should be installed to ease removal
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Water systems should be cleaned, flushed &
treated in accordance with current good practice, as described,
for example in the BSRIA Applications Guide AG 8/91 & AG 2/93
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For further relevant information, see CIBSE
Guide B (Section 7)
(For Valve Sizing Chart & Typical Mixing Valve
Applications see diagrams right.)
Hints on Sizing Control Valves
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The valve sizing chart is based on the
Siemens Building Technologies magnetic valve, kvs/size may vary
for other types & manufacturers
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Control valves should be sized relative to
the pressure drop in the “variable flow part” of the circuit
 Request information:
Siemens Building
Technologies Building Management Systems BMS Energy Management Systems
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Valve Sizing Chart
(Click on image for larger display)
Typical Mixing Valve Applications
(Click on image for larger display)
Siemens Building Technologies
Brunel House
Sir William Siemens Square
Frimley
Camberley
Surrey
GU16 8QD
Email this company
Tel : 0870 850 8453
Fax : 0870 850 8473
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