Diaphragm metering pump LEWA ecoflow  Ball valve (spring loaded or not) Valve spring Valve guide Handwheel Adjusting spindle Diaphragm drive Snifting valve + Venting valve (various combination possibilities, with venting valve always on top) Scale housing Air filter Seal ring Valve ball Valve seat Disc valve Valve guide Valve spring Valve body discharge side Fluid valve discharge side (in figure disc valve) Sliding shaft Diaphragm body Eccentric disc Seal ring Valve plate Valve seat Sandwich diaphragm (in figure M900 head) Hollow shaft Hexagon head screw / stud bolt Screwed plug Cone valve Valve housing Valve insert Radial seal rings Fluid valve suction side (in figure disc valve) Valve cone Valve seat Plunger with plunger rings Drive element housing Screwed plug Valve body suction side Pressure relief valve Valve spring Plunger rod drive pin Pump Head: product area Pump Head: hydraulic area Worm wheel Worm shaft Drive unit