... 27/93 EC 4)Established in 1987 one way water valve 1. Structure:2. Specification:1) DN40-6002) PN10/ ... 1092, AS 21293) F/F: ANSI B 16.10Butterfly valve is mainly consisted of body, stem, disc, seat and ... and so on. On off and controlling flow of valve are made by turning stem and disc together.3. ... .3. Disc has two-way bearing, perfect seal, without leakage under the pressure test.4. Flow curve tending ...