This Honeywell Globe Valve is a reverse-acting, equal-percentage flow control device. It features a 1/2 inch body size, which refers to the internal diameter of the valve's opening. The reverse-acting functionality indicates that the valve opens when the actuator force decreases and closes when it increases. The equal-percentage characteristic means that for each increment of valve stem position change, there is a consistent percentage change in the flow rate. This type of flow characteristic is typically used in heating and cooling applications where load changes are expected to be proportional to the square or cube of the controlled variable change.
