ENGINEERING DIVISION

Body:

All bodies shall be of fabricated steel flanged construction ANSI B16.5 machine faced to 125 RMS. All flanged bodies shall be sufficiently ribbed to prevent body deflection. Body journals shall be designed to incorporate sufficient clearance and shall not incorporate internal shaft bearings when noted. Upper and lower body journals shall be drilled, tapped and plugged to accommodate purge lines as required. All welded components shall be stress relieved.
Disc: 
Discs shall be fabricated thru-shaft removable construction and ribbed for maximum flow and minimal deflection. All discs shall be connected by means of tangential taper pins securely fastened with retaining nuts and tack welded. All discs shall incorporate a machined body seat ring for minimum class IV leakage.
Seat: 
All metal seats shall be located on the disc. The seat will be stepped to maximize the sealing surface and incorporate the specified material. The seat material will be designed to withstand continuous service conditions and not require field adjustment or replacement. Fiber tape replaceable seats will be incorporated as required.
Shaft: 
All shafts shall be one piece design, 316 stainless steel and machined to accommodate actuators for direct mount. Shaft diameters shall be to AWWA C-504 CL-75B. All stub shaft high capacity designs shall incorporate square drives and disc hubs. All shafts shall incorporate shaft-retaining collars or dual thrust bearings.
Packing: 
Valves shall incorporate replaceable adjustable packing without removal or dis-assembly of the valve from the piping. Packing shall consist of 3 rings minimum of .25” Graf oil in each body journal. Dual packing as required with external bearings. Packing journals shall incorporate disc & shaft crush ring and maintain a minimum Journal clearance of .250” on the radius.