Category: Technical information associated with Siemens Building
Technologies Guidance for Control Valves in HVAC Applications
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Siemens Building Technologies
Guidance for Control Valves in HVAC Applications
General Guidance for the Use of Control Valves in HVAC Application
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.
- Control valves must be suitable for the medium & operating
pressure
- Modulating type control valves must not be used where tight
shutoff is required
- Control valves can be manufactured with +/- 10% tolerance on the
kvs value. They should not be used as a reference for balancing
purposes
- “Mixing valves” have 2 inlets & 1 outlet
- “Diverting valves” have 1 inlet & 2 outlets
- Most manufacturers valves are “mixing valves” & when used in a
diverting application must be placed in the return
- 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
- 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
- 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
- For further relevant information, see CIBSE Guide B (Section 7)
Valve Sizing Chart
Typical Mixing Valve Applications
Hints on Sizing Control Valves
- The valve sizing chart is based on the Siemens Building
Technologies magnetic valve, kvs/size may vary for other types &
manufacturers
- Control valves should be sized relative to the pressure drop in
the “variable flow part “ of the circuit
Technical information associated with: Siemens Building Technologies -
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Siemens Building Technologies
Brunel House
Sir William Siemens Square
Frimley
Camberley
Surrey
GU16 8QD
Tel : 0870 850 8468
Fax : 0870 850 8473
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