Kirloskar brothers offersasv stubbe of germany manufactures a range of valves made of thermoplastic material, for industrial plants and chemical industries which are known as . Diaphragm-valves, type mv 310. These diaphragm valves , are maintenance-free, of solid plastic material design. The body of diaphragm valve optimized by fluidics guarantees a highest flow rate or kv-values, and a tremendous control characteristic. There is no effect of pollution since t, as these valves are hermetically enclosed against media and atmosphere by means of a highly flexible diaphragm with fabric ply therefore there is no effect of pollution.