The ornamental design for a fluid linevalve, as shown and described.
FIG. 1 is a front-top perspective view of a fluid line valve showing my new design;
FIG. 2 is a front-bottom perspective view thereof;
FIG. 3 is a rear-top perspective view thereof;
FIG. 4 is a rear-bottom perspective view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a left elevational view thereof;
FIG. 8 is a right elevational view thereof;
FIG. 9 is a top plan view thereof; and,
FIG. 10 is a bottom plan view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the fluid line valve and form no part of the claimed design.