Tank valve
FIG. 1 is a side elevational view of a tank valve showing my new design; 
     FIG. 2 is a front elevational view thereof; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is an elevational view taken from the side opposite that shown in FIG. 1; 
     FIG. 5 is a bottom view thereof; and 
     FIG. 6 is a top view thereof.