Mechanical Supplies
2-Way Control Valves
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- Modulating and on/off two-way valves with equal-percentage or linear characteristics, sized on Kvs rather than pipe diameter so that valve authority stays above 0.25. Bodies in bronze, brass and cast iron from DN15 to DN150.
Application
Control the water side of AHU, fan coil and chilled beam coils on variable flow circuits, closing off flow to the coil as the space load falls. Correct sizing matters more than any other selection on the branch: an oversized two-way valve does its whole job in the first 20% of travel and hunts for the rest.
Standards & Reference 4 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.
EN 1092-1
Dimensions and pressure/temperature ratings for circular steel flanges, designated by PN. What makes a valve bolt up to the pipework it was specified for.
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