The performance of our surface grinder control valves

First of all, our co-worker turned on and off the throttle control valve SOL-04TV. Then he walked next to the electronic control box, and demonstrated how to operate it by the box. After that, he went to switch on and off the two way throttle control valves TV-AB-04. Then he adjusted the internal spool of this valve to reduce the speed of working table. Afterwards, he manipulated the working table through the electronic control box again. Next, he turned the internal spool of TV-AB-04 to show the slow motion function.