Steering serious shudder - '69 Sportsroof GT

[FrankN]

I've just had the Power Steering Control Valve replaced in my "69 Mustang because the old one was leaking oil but worked ok, just leaked a little oil, the new one was installed yesterday and now the steering has a really serious shudder when turning left. The steering guys have been trying many things today to fix the problem but haven't gotten to the bottom it yet, any ideas out there? - Before they re-install the old control valve again?

Thanks in advance for any insight that you can offer.

BTW these guys doing the work spend most of their time on old school, classic and muscle cars.

[Nuts]

Is the orientation of the ram hoses correct?

[nassi]

This may be of some use, http://www.stangerssite.com/KnowControlValve.html