Electric servomotor, pneumatic geared drive, pneumatic cylinder, hydraulic cylinder, geared handwheel.

These valves are designed to inject a chemical into a running reactor while controlling throughput during the entire injection operation. This is sometimes required when a chemical cannot be continuously injected.
When the actuator begins operation, the piston withdraws into the valve body. Injection begins when the piston clears the first sealing ring at the valve nose. The internal lining is conical so that the further the piston retracts, the greater the flow cross section.
The location of the back stop allows perfect control of the injection rate and modification of this rate without any additional operation.

Firesafe, hardened piston coating, standby manual control, double gland box, automatic greaser, auxiliary connections, instrumentation.