This valve disc is provided with a wing communicating plate with perfect cavitation-resistance. The motor operation type is suit Comb Type Regulating ValvevStandard: GB, BS, ISO, DIN, AWWAvSuitable temperature: ≤80 celsiusvNominal pressure: PN0.61.6MPavNominal diameter:DN250-1800mmvMail material: grey cast iron, ductile cast iron, alloy cast iron, steelvSealing material: rubber-stainless Leakage: ...