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Size: DN50-DN800 (232) Nominal Pressure: PN10/PN16 Design Standard: API594 Flange Connection: DIN2501; BS4504; ANSI125/150; GB17241.6 Face to Face: ISO5752;GB12221 Test Inspection: API598; Suitable Medium: Water,Sewage,etc. 1) Small in size, light in weight,compact in structure, easy in maintenance. 2) Two torsion springs are used exerting on each of the pair valve plates, which close the plates quickly and automatically. 3) The quick-close action prevents the medium from flowing back and eliminates water hammer effect. 4) Short body structure length and good rigidity. 5) Easy installation, it can be installed on both horizontal and vertical direction pipes. 6) This valve is tightly sealed without leakage under the pressure water test. 7) Safe and reliable in operation, high-interference resistance.