I claim the ornamental design for a pressure balance valve, as shown and described.
FIG. 1 is a front perspective view of a pressure balance valve showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines shown in the figures are for the purpose of illustrating portions of the pressure balance valve and form no part of the claimed design.