... of position and torque is accurate and reliable VALVE ELECTRIC ACTUATOR:1. MAIN TECHNICAL PARAMETERS1) Power supply: 380 V, 50 Hz ... used for the control of ball valve, butterfly valve, and damper etc.3.FEATURES OF ACTUATORSNon-intrusive design is audio-visual ... meter below water surface for 68 hours)Provided with two series products of normal model and flame-proof modelSmall in size ...