S900 Main valve schematicThe S900 series of automatic control valve are Basic valves to provide hydraulically driven solution to pressure, flow and level control applications.Features of the altitude control valve:1 Top and seat ring guided stem and diaphragm assembly for long Iife and reliability.2 All iron components are fusion epoxy bonded for corrosion resistance.3 Easy maintance without removal from the main line.4 Nylon reinforced diaphragm for long time service .5 Drip tight shut off.6 Globe design for superior control characteristics.7 Ductile iron bodies for higher strength and durability.8 Corrosion resistant stainless steel seat and disc retainer ring.9 Various pilots and accessories available for configuration into many different applications.Special V-Port and double chamber are options, please consult factory.10 Meet standards BS EN 1074-5, ISO 5208. BS EN 12266-1, BS EN 558-1,