AWWA C504-58 PDF

This standard covers cast-iron and steel, flanged-end, rubber seat, tight-closure butterfly valves, 3-72 in, in size, for maximum shutoff pressures and line velocities as indicated in Table 1, together with torque requirements for operation. The valves specified are suitable for frequent operation, operation after long periods of idleness, and operation in a throttled position in water lines.