one way water valve 1)Size:DN40-DN1200 2)PN:1.0/ ... 3)ISO9001:2008, 27/93 EC 4)Established in 1987 one way water valve 1. Structure:2. Specification:1) DN40-6002) PN10 ... , quick 90 degree on-off operation.3. Disc has two-way bearing, perfect seal, without leakage under the pressure test.4 ... ten thousands opening and closing operation.5. Packing:6. Certificate: one way water valve