Specifications include, but are not limited to: This contract includes the supply of rising stems and electrical actuators for gate valves. The spillway sluice gate operators at Cushman 2 Dam are being replaced to provide the option of remote operation. Six hand operators are to be replaced with motorized operators. 2. ACTUATOR SIZING The actuator shall be sized at 200ft-lbs to guarantee valve closure at the existing differential pressure and temperature. The safety margin of motor power available for seating and unseating the valve shall be sufficient to ensure torque switch trip at maximum valve torque with the supply voltage 10% below nominal. For the valves, the operating time will be approximately five (5) minutes to travel 24 inches on a 2 1/4 - 3 ACME thread or 15 RPM. Clockwise nut rotation looking downward opens the gates, right hand thread on riser stem, clockwise handwheel rotation shall close (lower) the gates. 3. ENVIRONMENTAL Actuators shall be suitable for indoor and outdoor use. The actuator shall be capable of functioning in an ambient temperature ranging from -30°C (-20°F) to 70°C (140°F), and up to 100% relative humidity. 4. ENCLOSURE Provide a 2 1/2-foot long clear stem protection tube. Actuators shall be o-ring sealed, watertight to IP66/IP68 7m for 72hrs, NEMA 4X, 6. The motor and all other internal electrical elements of the actuator shall be protected from ingress of moisture and dust when the terminal cover is removed for site for cabling, the terminal compartment having the same ingress protection rating as the actuator with the terminal cover removed. All external fasteners shall be stainless steel. The use of carbon fasteners is not permitted.