Position of the valve is not so important in the case of globe valve.In this perticular case the seat(metal to metal contact)may be worn-out or the stem centre line is not exactly perpendicular to the seat plane and hence a small gap exits around the circumference when the valve stem is...
The type of cylinder you are looking for shall be
custum built to meet your requirement of deflection
and load carrying capacity.Any prominent hydrualic
cylinder manufactures will design for you.