Products Sanitary Valves High Purity Valves DVP Series Pneumatic Diaphragm Valves Sing-Tao® DVP Series Pneumatic Diaphragm Valve: hard-sealed, metallic bellows, fully welded body, ultra-low leakage, rapid response. Ideal for semiconductor applications. DVM Series Manual Diaphragm Valves Sing-Tao® DVM Series Manual Diaphragm Valve: hard-sealed, metallic bellows, fully welded body, ultra-low leakage, and smooth operation. Ideal for semiconductor applications. Page 1 of 1