The Series 20 (wafer) and Series 21 (lug) resilient seated butterfly valves feature a two-piece body. Available in a wide selection of high-quality seat and disc materials for a variety of applications, our Series 20/21 butterfly valves are easily automated for on/off or modulating service. Maximum Operating Pressure: 10 bar
API 609
Butterfly Valves: Double-flanged Lug- and Wafer-ty...
API 598
Valve Inspection and Testing
EN 12266-1
Industrial valves - Testing of metallic valves - Part 1: Pressure tests, test procedures and acceptance criteria - Mandatory requirements
MSS SP-67
Butterfly Valves...
MSS SP-61
Pressure Testing of Valves
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