the issue with this valve is the packing of the stem is damaged, so when they are replaced by a new one from another material ( the original one is reinforced graphite but the new one washer is made of resistive rubber to high pressures, now after we have done the reassembly of the stem with body ,, it is noticed that there is small leak in the downstream , the GX type 20 mm length between opening and closing , so the question that , is there any bench set for this fisher GX
