Pressure Control Valves Pressure Reducing Valves DM 3, 4 MANKENBERG GmbH | Spenglerstraße 99 | D-23556 Lübeck Weight Loaded Pressure Reducing Valve Technical Data Connection DN Nominal Pressure PN Inlet Pressure Outlet Pressure Kvs-Value Temperature Medium Description 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 3 and DM 4 pressure reducers are medium-controlled weighted-lever valves for medium to large volumes. These valves require no auxiliary energy. Thanks to their integral control characteristics they are very accurate. The time reponse is set by means of an oil-filled damper. DM 3 is a single seat, DM 4 a twin seat valve; both are piston-controlled. The valves can be supplied with soft or hard seals. The valve seat leakage meets the VDI/VDE Guideline 2174. When the pipeline is depressurised the valve cone is kept in open position by the weighted lever. As the outlet pressure rises a control piston is pressurised via a pilot line, lifting the lever and moving the valve cone towards the „closed“ position. During normal operation the opening force of the weight and the closing force of the piston balance each other and the pressure reducer operates continually. The outlet pressure is kept constant irrespective of inlet pressure and flow volume. The control pressure is set by changing the weight on the lever. The maximum outlet pressure must not exceed 1.5 times the set pressure, unless specified otherwise. In the case of toxic or hazardous media a leakage line must be installed to the control unit capable of draining leaking medium safely and without pressure if the control element should become defective. These valves are no shut-off elements ensuring a tight closing of the valve. In accordance with the VDI/VDE guideline 2174 a leakage rate of 0.05 percent (DM 3) respectively 0.5 percent (DM 4) of the constant volume flow is permitted for the valve in closed position. The valves requires a sense line (to be installed on-site). Options » various seal materials suitable for your medium » special versions on request Operating instructions, know how and safety instructions must be observed. All the pressure has always been indicated as overpressure. We reserve the right to alter technical specifications without notice. Suffix E = enlarged outlet Kvs-Values [m3/h] type nominal diameter DN 150 200 3 (E) 200 300 4 (E) 250 400 Suffix E = enlarged outlet

Pressure Control Valves Pressure Reducing Valves DM 3, 4 MANKENBERG GmbH | Spenglerstraße 99 | D-23556 Lübeck Weight Loaded Pressure Reducing Valve Materials Temperature Nominal Pressure Operating Pressure Body O-Ring Materials Temperature Nominal Pressure Operating Pressure Body Tubular Section Internals Valve Seal O-Ring Dimensional Drawing 80 °C PN 16 PN 40 max. 16 bar max. 40 bar spherodial cast iron cast steel or cast steel steel welded chromium steel / CrNiMo-steel NBR / FPM / EPDM / PTFE cromium steel / CrNiMo-steel NBR / FPM / EPDM / PTFE 280 °C PN 16 PN 40 max. 13 bar max. 28 bar cast...