If i look from your pictures the valve bracket is bolt to the base, then you should apply X, Y, Z. It is not move axial, lateral and up but it can rotate.
And apply only support in the middle as Bob said, it is more practical.
I have also have experienced with this kind of modelling several years ago, but it was a Firedos pump that was uused in Fire Water Foam System of LNG Plant as you can see in figure below.