The VMT is a 2-way valve used in controlling the flow of hot water within heating applications. The VMT valve can be installed in applications involving heating or chilled coils, hot water storage tanks, plate heat exchangers or floor heating systems. In the control of the VMT valve, a thermostatic operator type RAVK or a 24VAC electric actuator type TWA-V or ABV can be mounted to the valve to regulate the temperature and flow through the valve.