By Ningbo Valve Factory Inprinted with Ningfa Brand Electrical & Manual operator. DN( Diameter Internal) from 700mm to 1600mm. Suitable For: Water, Vapour & Petrol. Operation Temperature: 80 or less than 80 degrees. Power Driven operator. If you do not feel satisfactory with this type, please give us your ideal standard, drawings, materials for machining services. Welcome to order in our company andy any of you inquiry shall be replied within two days at most. If you have such needs, please let know.