Mud valves shall be of the iron body, bronze mounted type with (rising, non-rising, sliding) stems, (Flanged, spigot) ends, (extensionstem, 2” square operating nut, handwheel) and open by turning(left, right).
The frame, yoke and gate shall be sturdily proportioned for strength and rigidity and be of cast iron conforming to ASTM specifications A126 Class B.
The stem, stem nut and seats shall be bronze. The stem shall be machined with accurately cut modified acme threads.
The gate seat shall be rolled into a dovetailed groove under pressure to make one inseparable unit. The body (frame) seat ring shall be threaded and screwed into place in the frame.
Both gate and body seat ring faces shall be machined to a smooth finish.
Mud valves shall be manufactured by Kennedy Valve or approved equal.