The DCV 32 Closed component is a three-port, two-position valve. Typically, port 1 is connected to the pressure line, port 2 is the outlet port, and port 3 is the exhaust port.

There are two paths between different ports in this valve, port 1 to port 2 (1-2), and port 2 to port 3 (2-3). Note that $C_{\min }$is the minimum sonic conductance for all the paths while there is a specific maximum sonic conductance, $C_{\max }$, for each path. There is also a specific critical pressure ratio, $b$$\,$for each path.

The sonic conductance for the path between pairs of ports varies as a function of the spool input signal, $s$,  $C_{\max }$for that path, $C_{\min }$, and $\mathrm{band}$. The following table gives the sonic conductance values for the two end values of spool signal.

Transitions are centered at the midpoint, with the width given by the $\mathrm{band}$ parameter, as shown in the following diagram.