Our company can provide float valves the materials are SS, cast iron, if you are interested, please let us know, thanks 
Design features:
? Full port or reduced bore 
? Resilient or metal to metal seat
? Fire safe, anti-static device
? Blow-out proof stem
? Optional locking device 
? Optional stem extension 
Capabilities and ranges:
? Size range: 1/2" thru 10" (DN15-DN250)
? Pressure rating: ASME #150 to 600 (PN16-PN100)
? Body material: carbon steel, stainless steel, alloy steel, duplex steel, aluminum bronze
? Trim material: carbon steel, stainless steel, alloy steel, duplex steel, aluminum bronze
? Ends connections: FLG R/F or R/TJ, weld B/W or S/W, thread NPT or BSPT 
? Operation: manually lever or gear, electric, pneumatic or hydraulic