3-Way Control Ball Valve

The 3-way control valves consist of a heavy-duty ball valve and either a quarter turn electric or pneumatic actuator. The valves provide a high degree of accuracy and repeatability for accurate temperature control and are equally accurate in mixing or diverting service over a wide flow range. The heavy-duty rotor design provides tight temperature control without high maintenance requirements. The system is available in three standard control configurations: electric; pneumatic; and electro-pneumatic, offering flexibility for most requirements.

Some actuator options are designed and reinforced for vibration service and are qualified to Lloyd’s Marine Requirements for shipboard service. Certain valve and actuator combinations can be directly mounted to reciprocating machinery such as diesel engines, without vibration isolation. Standard valves are suitable for a variety of fluids such as water, water/glycol, sea water, lubricating and hydraulic oils. Optional body materials are available for services involving synthetic or fire-resistant oils, deionized water and ammonia or freon in oil.

For the electrically operated valves, a number of actuator options are available, which use an electric motor that rotates in either direction in response to the control signals received. The motor drives a gearbox connected to the rotor shaft and turns the valve rotor clockwise or counterclockwise, normally 0 – 90 degrees. At the end of travel, limit switches are incorporated to isolate the electrical supply to the motor when the valve rotor has reached either end of the rotation. A feedback hall sensor is available on some actuators, providing position indication to the control system.

A typical electric valve system incorporates an electrically actuated three-way control valve with an electronic controller and temperature probe. AMOT’s 8071D PID Controller can be either panel or wall mounted. The system is completed with a temperature sensor type 8060.

The electric valve system is simple to install with standard multicore cable and provides more accurate measurement and control than typical pneumatically operated systems.