bypass valves

I know nothing about water softeners, but, if it is like most plumbing standards, the markings on the valve should correspond with the direction the flapper is facing inside the valve.

If the markings are parallel with the pipe that the valve stem is attached to, the flow is open. If they are horizontal to the pipe, the flow is closed.

thanks I believe your are correct. I found the info in another service manual on line
Captainron37