Valves shall conform
to the latest version of AWWA Standard C-509 covering Resilient
Seated Gate Valves for Water Supply Service.
- The valves shall have
a cast iron body, bonnet and wedge. The wedge shall be totally
encapsulated with rubber.
- The sealing rubber
shall be permanently bonded to the wedge to meet ASTM tests for
rubber metal bond ATSM D429.
- Valves shall be supplied
with O-Ring seals at all joints. No flat gaskets shall be allowed.
- The valves shall be
either non-rising or rising stem, opening by turning (left, right,)
and produced with 2" square operating nut or a handwheel
with the "Open" and an arrow cast in the metal to indicate
the direction to open.
- Stems for NRS assemblies
shall be cast bronze with integral collars in full compliance
with AWWA. OS&Y (rising stems) shall be of bronze. All stems
shall operate with bronze stem nuts, independent of stem (in NRS
valves). Stainless steel stems or stem nuts are not allowed. NRS
stems shall have 2 O-Rings located above thrust collar and one
O-ring below. All stem O-Rings shall be replaceable with valve
fully opened and subjected to full pressure. The NRS stems shall
also have 2 low torque thrust bearings located above and below
stem collar to reduce friction during operation.
- Waterway shall be
smooth, unobstructed and free of all pockets, cavities and depressions
in the seat area. Valves shall accept a full size tapping cutter.
- The body, bonnet and
stuffing plate shall be coated with fusion bonded epoxy, both
interior and exterior on body and bonnet. Epoxy shall be applied
in accordance with AWWA C550 and be NSF 61 certified. PIV plates
shall be painted black.
- Each valve shall have
a maker's name, pressure rating, and year in which it was manufactured
cast in the body. Prior to shipment from the factory, each valve
shall be tested by hydrostatic pressure equal to requirements
of both AWWA and UL/FM.
- All internal parts
shall be accessible without removing the body from the line.
- Valves shall have
all brass components cast and assembled in the USA and shall be
manufactured by Kennedy Valve Company or equal.