Moog 500 Series Specifications download pdf (Page 22)

1. As a general rule, hydraulic components should not be

disturbed while they are operating normally.

– This rule particularly applies to Servo or Proportional

Valves.

– They should not be removed unless trouble-shooting has

shown that they are malfunctioning.

– If the system must be “opened” (for example, adding

new pipework, hoses, valves or actuators), then the valve

should be removed, replaced by a flushing plate and the

new system start-up procedure followed.

2. If the valve must be removed, the area around the subplate

should be thoroughly cleansed using non lint producing

materials before raising the valve from the surface.

– If the valve function is critical, a spare Servo or

Proportional Valve should always be held in stock.The

spare should be fitted in place of the removed valve and

the shipping plate placed on the removed valve.The valve

should be returned to Moog Inc. for service. A newly

installed valve may develop a fault soon after fitting if care

is not taken with cleanliness.

– Where no spare valve exists the surface should then be

covered by a clean plastic sheet so as to limit the possibil-

ity of contaminants entering the system.The valve should

be returned to Moog Inc. for service.

3. Some valves are fitted with manual override operators. Most

have null adjust screws. No other adjustments are possible

in the field, apart from the null adjustment.The style of this

adjustment varies with different valves. Consult individual

valve series data sheets for details.

4. The torque motor is a precision device. Do not attempt to

remove or dismantle. Permanent and expensive damage can

result. Likewise, do not try to remove the spool in the main

stage. Return the valve to Moog Inc. for service.

5. Moog Inc. will not partially repair a valve. Our policy is to

always return the valve to its original specification. In so doing

it will always be returned with a 24 month new valve warranty.

6. Moog Inc. Servo and Proportional Valves are used when

precision control is required.The Servovalve is a precision

instrument and consistency in performance is not possible

with “dirty oil.”

7. There are two considerations in filtration for Servo and

Proportional Valves.

7.1 Particle Contamination:

Larger particles from approximately 40 microns and

upwards can lodge in the Servovalves’ pilot stage filter

screen. Particles smaller will generally pass through.

This is a last chance filter and is not intended as a

system filter. See page 20 for filtration details.

7.2 Silt Contamination:

This can, under certain circumstances, lead to seizure

of the main spool in the bushing. However, this is rare

due to the very high spool positioning forces employed.

Silt does affect valve life by eroding the sharp metering

edges on the valve spool and bushing.

8. Contamination Control

Contamination enters the fluid at many points:

8.1 New oil supplied from refineries contains noticeable

residue in the bottom of empty drums. Particles of 100

micron and larger are quite usual in new oil.

8.2 Filling Methods:

Contamination can enter via dirty funnels or other

unhygienic filling methods. Moog Inc. recommends a

transfer pump upstream of the 3 micron low pressure

filter. When in doubt, remove the valve, fit a flushing

block and flush the system out before refitting the valve.

8.3 Airborne Contaminants:

Many factories have very dusty air in the vicinity of the

hydraulic power unit. Sometimes the dust is corrosive. In

systems with large air flows in and out of the reservoir,

Moog Inc. recommends a 3 micron breather filter.

8.4 Airborne contaminants are also collected on the rod

end of hydraulic cylinders and are drawn into the

cylinder in varying amounts, depending on rod wiper

efficiency.These are normally collected in the 3 micron

low pressure filter.

8.5 Contaminants from rubber hose, teflon tape, metal silt

particles from wearing valves, pumps, etc. all contribute

to fluid contamination.

ROUTINE MAINTENANCE FOR SERVO AND PROPORTIONAL VALVES

Maintenance

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Moog 500 Series Specifications Page 22

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