What are the three control (needle) valves on a common three-valve test kit?
- Inlet, outlet and relief
- High, low and bypass (vent)
- Supply, zone and drain
- Hot, cold and mixed
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B. High, low and bypass (vent)
A three-valve kit has a high-side valve, a low-side valve and a bypass or vent valve, matched to the high, low and bypass hoses. The other names describe parts of an assembly, not of the test kit.
Reference: ASSE Series 5000 field test procedures; USC FCCCHR Manual of Cross-Connection Control, 10th ed., field test procedures