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Corrosion Resistance. Normal construction is of mild steel, hot dip galvanised. Stainless Steel, in grades 304L or 316L, may also be specified.
Sealing Method. A flat steel door slides vertically within the side frames, and is inclined at a slight angle, as seen in the illustration. A rubber sealing ring, which is riveted and glued into a recess in the body of the valve, is inclined at the same angle as the door. The door and seal come together with a wedging action, as the door is lowered.
Installation. These valves are normally grouted into pipes or headwall structures. The body spigot has attached lugs, which will lock into the grout and also assist with aligning the valve in the pipe opening. The spigot and lugs fit, with a slight clearance, within Class 2 concrete pipe.
Sizes and Pressure Rating
Nominal valve size (mm) and maximum on-seating /off-seating pressure, expressed in metres head.