Fault analysis and elimination of hydraulic servo valve

First, the type of servo valve:

- 1 proportional directional valve: 4WRA10E4010-B24N (4 m proportional cutting machine)

- 2 proportional valve: PSV61/220/-5

-52L120/63/EA

-52L120/63/EA

-52L120/63/EA

-EA-G24 (5500T grate cooler)

Two, failure analysis

- 1 servo valve does not act, resulting in the implementation of components do not move

The internal parts are damaged; the spool valve is dead; the nozzle is blocked; the internal filter screen is blocked; the pressure of the oil supply is low, and the plane of the valve is poor;

- 2 frequent zero drift

Valve itself caused by zero drift; oil temperature changes; oil pressure changes; oil pollution; zero drift of electrical parts; mechanical zero and electrical Zero coincidence; mechanical symmetry;

(3) servo valve output flow less

Low fuel supply pressure; insufficient fuel flow; amplifier gain; dirt clogging, stuck

(4) dynamic characteristics, poor stability, large steady-state error

See servo system

(5) no signal input, but the actuator moves to one side

• the main spool stuck in a certain open position; zero offset;

(6) zero leakage increases, pressure gain decreases

The valve clearance increases; control edge angle damage;

Three, the use of servo valve

- 1 oil filter and cleaning;

- 2 pipeline as far as possible without the use of welded pipe joints;

- 3 tank pollution control

- 4 system connections

- 5 servo valve coil connection

- 6 fault occurs, the first to find the external components of the loop fault, the final check servo valve

-7 servo valve installation, pay attention to the force of the screw