ACL 2 Port Motorised Valve - Flow direction

I am intending fitting some 2 port motorised valves tomorrow, mainly honeywell and one ACL.

I don't have any instructions for the ACL.

The honeywells have to be fitted in the correct direction of the flow.

I assume to prevent the pump fighting the valve motor ?

The ACL doesn't have a flow direction arrow.

Which way round do I fit it ?

It is marked A B on the pipe connectors and has a flap to shut off the water rather than ball.


P.S I have noticed in the past that connections marked A B C are not consistent across different makes !

Thanks for any pointers

ACL model 679h30

A is pump side, B is return side.

thanks very much