Masoneilan 4700/4800 E (electropneumatic) and 4700/4800 P (pneumatic) are reliable positioners developed by Baker Hughes, designed to deliver precise positioning, rapid response, and tailored control characteristics for control valves through the use of a precision feedback cam.
These positioners are compatible with both rotary and reciprocating actuators. In the case of rotary actuators, the cam is directly affixed to the shaft, while for reciprocating actuators, a robust turnbuckle and lever assembly connects the stem motion to the cam.