I am building a small testing device consisting of a double acting pneumatic cylinder. I am using an existing pneumatic line running at 100 psi and I would like to control the force exerted by the piston on my test sample? My question is whether an electronic 5/3 direction control valve can be used to control the output force of the cylinder, the signal for this valve would be dictated by the readings from a load cell attached to the cylinder rod. This is a cyclic test so i need to ensure that the force remains within the allowable limits across all cycles. In case this is not possible can anyone advice about a proper way of doing it? I don´t require high precision +-5% of variance is accepted. I don´t have a lot of budget so, easy to implement solutions are preferred.