Overflow valve type 1.8 DN Medium-controlled overflow valves are simple control valves offering accurate control while being easy to install and maintain. They control the pressure upstream of the valve without requiring pneumatic or electrical control elements. The UV 1.8 overflow valve is a spring-loaded seat-controlled proportional control valve featuring diaphragm, piston or bellows control. It is designed for hygienic applications and medium volumes of high-viscosity media. The valve cone can be fitted with a metallic or soft seal.