1.Cast Iron lug butterfly valve 2. Design standard: MSS SP-67, API609, EN593. 3. Flange to: ... :1:Design standard conform to: MSS SP-67, API609, EN593.2:Connection flange conform to: DIN PN10/16/25, ANSI B16 ... )Product characters:1. Rubber backed seat with stable valve torque.2. Grooved sleeve design to achieve stable positioning.3. Simple construction, small ...