Emerson Fisher 644 and 645- Manuals

Instruction Manual D100302X012 644 and 645 Pump Governors February 2014 5 Figure 4. Typical Installation for a Relief Governor SUCTION PUMP DISCHARGE 14A2789-A A1763 EQUALIZING VALVE BOILER PRESSURE RELIEF ACTUATOR CAUTION The equalizing line helps prevent damage to the diaphragm when the system is ...

Instruction Manual D100302X012 644 and 645 Pump Governors February 2014 6 Overpressure WARNING Overpressuring any portion of this equipment may cause damage to the governor parts, leaks in the system, or personal injury due to bursting of pressure-containing parts.To avoid overpressure, provide an a...

Instruction Manual D100302X012 644 and 645 Pump Governors February 2014 7 Principle Of Operation Figure 3 shows a 645-ED being used to directly maintain a differential setting between the pump discharge pressure and the boiler steam pressure in a boiler feedwater system. If pump discharge pressure i...

Instruction Manual D100302X012 644 and 645 Pump Governors February 2014 8 Disassembly Refer to figures 6 and 7. 1. Remove the control line from the upper casing.2. Relieve spring compression by turning the lower spring seat (key 19) clockwise into the yoke.3. Disconnect the stem (key 22) and the dia...

Instruction Manual D100302X012 644 and 645 Pump Governors February 2014 10 Parts Ordering Each actuator has a serial number stamped on the nameplate. Always mention this number when corresponding with your Emerson Process Management sales office regarding technical information or replacement parts. ...