The Maxton UC4 hydraulic elevator control valve is our most common elevator control valve for low flow hydraulic elevator applications. Use the Maxton valve calculator for valve sizing to the job specifications. The UC4 valve was designed to meet the demands of the hydraulic elevator industry, featuring individualized adjustments, high efficiency solenoids, an integrated relief valve and more. JACK port is located to the right - TANK port straight across to the left - PUMP port at the bottom. Solenoid - Square pattern.