All non-lubricated eccentric plug valves shall be Homestead Series 120 or
approved equal
Bodies shall be of the rectangular ported design, ASTM A126 Class B cast
iron with bolted bonnets.
Rated for 175psi working pressure for valves 12" and smaller and
150psi for valves 14" and larger.
Flanges shall fully conform to ANSI B16.1 requirements in all respects
including flange thickness.
Port area of valves 20" and smaller shall not be less than 80% of
pipe area, and not less than 70% of pipe area for valves 24" and
larger.
All valves must have fully coated plugs of Neoprene, Hycar, EPDM or
Isoprene as dictated by the application with mating seats of no less than
90% pure nickel in the finished state, raised and welded into the
body.
Stainless steel seats are not acceptable and plug elastomer retained by
means of seat rings and retaining screws are not acceptable.
Upper and lower radial bearings must be removable 316 stainless steel for
valves 20" and smaller; valves 24" and larger shall have 316
stainless steel or bronze bearings.
Stem seals shall be multi-V ring adjustable packing type and shall be
in-line replaceable without valve disassembly.
Flanged ends must be faced and drilled per ANSI B16,1, Class 125;
mechanical joint ends must conform to AWWA C111.