Mechanical Supplies
Pressure Independent Valves
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- Oventrop "Cocon Q" pressure independent control valves, an automatic flow regulator with a manually set nominal value, in series with a control plug, inside one DZR brass or cast iron body. QTZ covers DN 15-32 (30-3600 l/h), QTR DN 40-50, and QFC DN 40-150 flanged or grooved
- PN 16, −10 °C to 120 °C, with an M 30 x 1.5 actuator thread and a 4 bar maximum differential.
Application
The default on variable flow chilled water serving fan coils, AHUs and chilled beams, the "Q4" body covers chilled beam duties specifically. In tall buildings, where pump head and part-load conditions swing the branch differential widely, the valve holds flow at its set maximum regardless, which protects control authority at low load and is the practical fix for the low delta-T syndrome that keeps chillers running inefficiently.
Standards & Reference 6 cited
EN 60534-2-3
Test procedures for control valve flow capacity: how the Kv figure a designer sizes on is actually measured.
IEC 60534-8-3
Predicting the aerodynamic noise a control valve will generate, so the acoustic consequence can be calculated at design stage rather than discovered on site.
EN 12266-1
Pressure testing of metallic valves: the shell and seat tests a valve passes before it leaves the factory.
VDI 2073
German guidance on hydraulic circuits in heating and cooling systems: the basis for how a hydronic network is balanced.
NSF/ANSI 61 Annex G
The lead-content limit within the drinking water standard: the basis of the 'lead-free' designation for potable water components.
PN 16
A nominal pressure rating of 16 bar. The PN figure sets the flange drilling and the pressure the body is rated for.
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