The products are designed and developed in parts in body (Overcenter), these valves are characterized by mechanical moving parts that slide directly on the valve body in zinc-plating steel and allow to maintain and control negative loads and in the presence of gravitational forces. They are designed to support loads in many applications such as lifting, earth moving and agriculture. They can be mounted on in-line or flanged actuators and can be single or double, for applications for open center or closed center.