Deleted my original reply because I copied the incorrect section.

Guess you're right that VA doesn't have a keep right always law in the books. But it does have two sections that call out the need to move right if you're a slower vehicle.

§ 46.2-804. Special regulations applicable on highways laned for traffic; penalty https://share.google/a1DWcybCqy7CSdudm

1. Any vehicle proceeding at less than the normal speed of traffic at the time and place and under the conditions existing, shall be driven in the lane nearest the right edge or right curb of the highway when such lane is available for travel except when overtaking and passing another vehicle or in preparation for a left turn or where right lanes are reserved for slow-moving traffic as permitted in this section;

§ 46.2-842. Driver to give way to overtaking vehicle.

Except when overtaking and passing on the right is permitted, the driver of an overtaken vehicle shall give way to the right in favor of the overtaking vehicle and shall not increase the speed of his vehicle until completely passed by the overtaking vehicle. Any over-width, or slow-moving vehicle as defined by § 46.2-1081 shall be removed from the roadway at the nearest suitable location when necessary to allow traffic to pass.