Medium-controlled pressure reducers are simple control valves offering accurate control while being easy to install and maintain. They control the pressure downstream of the valve without requiring pneumatic or electrical control elements. The DM 505 pressure reducing valve is a diaphragm-controlled springloaded proportional control valve for small volumes. This pressure reducer is manufactured from deep-drawn stainless steel featuring excellent corrosion resistance. The tubular inlet spigot of the valve body accommodates the seat aperture. The soft-sealing valve cone is guided in the seat assembly and connected with the control diaphragm by means of a stirrup which surrounds the seat assembly. The valve type 505 Z, recommended for temperatures up to 200 °C, is identical in its design apart from the metallic cone seal and water-cooled thermal protection between body and diaphragm.