Valve bearings shall be of a self-lubricating, nonmetallic material to effectively isolate the disc-shaft assembly from the valve body. Materials of construction shall be ASTM A, Class B cast iron disc with a stainless steel type edge Discs shall be retained by stainless steel pins which extends through the full diameter of the shaft to withstand the specified line pressure up to valve rating and the torque required to operate the valve. Metal-to-metal thrust bearings in the flow stream are not allowed. All actuator components shall be capable of withstanding an input torque of ft-lbs. Cast iron discs or alloy cast iron is not acceptable. Carbon steel shafts with stainless steel journals are not acceptable. The Corporation recognises that the rim pull and input torque requirements specified in Section 2. 
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Head loss analysis and Cv values shall be provided with the stanadrd submission and will be taken into consideration by the Corporation during any tender analysis. Rubber seats shall be recessed in the valve body.
The lower valve shaft shall incorporate a dual thrust bearing to permit valve positioning in a degree circumference. Carbon steel shafts with stainless steel journals are not acceptable.
All valve shafts shall be one piece of two piece stub-shaft type or ground and polished stainless steel. Thanks for your valued time with interest!
Metal-to-metal thrust bearings in the flow stream are not allowed. Valve seats shall be field replaceable without the dismantling of the valve or actuator or removal from the pipe.
Free standing torque tubes. Valves under mm shall have the seats recessed in the body and supported on three sides. The disc shall be free of hollow chambers.
The disc shall be a lens-shaped design to afford minimal pressure drop and line turbulence. Valve seats shall be field replaceable without the requirements of awa to the disc.
The valves shall be designed for the velocities and pressure set out in these specifications and shall have Class B velocity designation. The bolts shall be capable of lifting the valve together with the actuator as a single unit. For wafer style valves, the seat shall cover the entire inner surface of the valve body and extend over the outside face of standafd valve body to form a flange gasket. All valves shall incorporate four tapped holes strategically located on each flange outside diameter.
Materials of construction shall be ASTM A, Class B cast iron disc with a stainless steel type edge Discs shall be retained by stainless steel pins which awqa through the full diameter of the shaft to withstand the specified line pressure up to valve rating and the torque required to operate the valve. The Corporation shall give preference to those actuators meeting the specifications stated in Section 2. At the operator end of the valve shaft, a packing gland utilizing "V" type chevron packing shall be utilized.
Valves mm and larger shall have seats standarx field adjustable around the full degree circumference, under full pressure from the perimeter without removal of the valve.
The diviner shall incorporate the direction to open or close the valve. All valves shall be comply with the following details. The valve shaft shall be capable awws horizontal mounting. Please feel free to contact with us at Vatac vatacvalve.
Municipal Products
The Corporation recognises that the rim pull and input torque requirements specified in Section 2. The valve shall have a clear inside diameter equal to the stated nominal diameter.
Stzndard stops located in the flow stream are not allowed. All surfaces shall be capable of visual inspection. The manufacturer shall have previously manufactured rubber-seated AWWA butterfly valves of the same design for a minimum period of five years.
DeZURIK AWWA Butterfly Valves (BAW)
All seats shall be of a natural or synthetic rubber. The stuffing box depth shall be sufficient to accept at least four rings of packing. Two eye bolts shall be supplied with each valve. RP Backflow Preventer Specification.
AWWA C Rubber Seated D.I Butterfly Valve – GLOFA VALVE CORP. I GLOFA VALVE MANUFACTURER
Stahdard bearings shall be of a self-lubricating, nonmetallic material to effectively isolate the disc-shaft assembly from the valve body. All actuator components shall be capable of withstanding an input torque of ft-lbs. Sewage Treatment Plant Suggested Specs.
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