Overload protection. Overloads developed by excessive input torque are absorbed instead of being transmitted to mechanism and valve. Lets you apply up to 450 pounds input torque at open and closed positions without damage to valve or operator. Will produce more than double the AWWA Standard C-504 (Table 1) output torque requirement through entire travel.

Permanently Sealed. Underground operator is permanently lubricated and sealed from ground water.

Reduces Water Hammer. Operator design is such that constant input speed results in variable output speed with slowing down of valve closure at ends of travel. This effect reduces water hammer, while maintaining rated output torque throughout entire travel.

AWWA Operating Nut. The two-inch square operating nut on the underground operator is clearly marked with "open" and direction arrow. All other operators have position indicators which clearly show "open-shut" positions.

Seating provides Bottle-Tight, Permanent Closure

The unique vane-seat and body-seat construction of the M&H Butterfly Valve assures you of 100% bottle-tight sealing for the life of the valve.

The 18-8 Stainless Steel seat (1) is made integral with the valve body for a permanent, corrosion-resistant seating area.

The rubber seat (2) is vulcanized to the stainless steel seat-retaining ring (3) which is firmly clamped to the vane by stainless steel self-locking screw fasteners (4). This construction forms a positive lock between vane and rubber seat which assures 360° leak-free seating.