The temperature control valve is marked TV on one side and HC on the other
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There are two temperature control valves; one is labeled TV and the other is labeled HC. Could you please tell me the difference between these two?
Are there two control valves? One is controlled in a single-loop manner based on temperature, while the other is manually operated to adjust the valve.
TV is the control valve of the automatic temperature control circuit, while HV is the control valve of the manual control circuit.
The TV is the control valve in the temperature automatic control circuit； HC is a manual controller, and the corresponding control valve should be labeled as HV.
It’s easy to understand literally: in TV, T stands for temperature, and V stands for valve, that is, the control valve used in the temperature control circuit. In HC, H stands for manual, and C stands for control, meaning the valve is operated manually.
What each letter represents after the initial letter can be seen at a glance in Table 1
TV stands for temperature control valve； HC stands for manual control valve. Many design institutes prefer to label control valves with continuous control as TV ； And the logically controlled control valve is labeled as HC. The specific differences should be stated in the design specifications.
TV stands for temperature control valve； HC stands for manual control valve.
It should be specified in the design notes.