Flowserve LHS Hydraulic Heavy-Duty Actuator Series User Manual download pdf (Page 21)

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LHS Hydraulic Heavy-Duty Actuator Series FCD LFENIM0003-00-AQ 7/14

Problem Possible Cause Solution

The actuator does not

move

Actuator has not been properly

installed.

Check that all the hydraulic connections and that all the hydraulic

components have been installed correctly, and are in accordance with the

actuator operating mode.

Check that the actuator is properly connected to the valve and that there

aren’t problems in the mounting kit.

Supply Pressure Problems.

Check that sufﬁcient supply pressure is available at actuator inlet port. If

possible, place a gage in line and monitor the pressure level, in order to

discover unexpected pressure drops.

Problems in the control panel (if

present).

Check the correct functioning of the control panel. In particular, check all

the hydraulic and electric connections.

Check the correct level of supply voltage for solenoid valves and other

electrical/electronic components.

The valve is blocked.

Check that valve is free to rotate. If necessary disassemble the actuator

from the valve.

Exhaust port(s) obstructed.

Screw cap(s) must be disengaged. Ensure vent ports are free. If not,

clean them of any obstructions and clean the dust excluders, if present.

Problem with lubricants.

Ensure that the actuator is properly lubricated, and that there is no solid

iﬁed grease among sliding parts or rotating parts. If actuator lubrication

is inadequate or improper, apply a uniform lubricant layer. Follow the

instructions for cylinder maintenance (para. 4.3). Consult Flowserve for

proper oil and grease to be used.

A moving part is seized up.

Check if any moving part is blocked. If so, follow the maintenance

instructions given in the relevant paragraphs of this manual or in special

maintenance operating instructions.

Leakage of the hydraulic cylinder.

A signiﬁcant oil leak may prevent the actuator from operating. Ensure

that there aren’t any leaks in the hydraulic cylinder toward the outside.

If possible, detect them using a leak ﬁnder spray. Check also that there

are not leaks across the piston. If leaks are present, follow the cylinder

maintenance instructions given in paragraph 4.3.

The actuator model is not the correct

one, or is not suitable for the plant

conditions.

Check the actuator nameplate and the plant requirements. If there are

mismatches, contact Flowserve Service Department.

Spring Problems (if actuator is a

single acting model).

Check the proper functioning of the spring can. If problems are found,

contact Flowserve Service Department.

Perform the following test: disassemble the actuator from the valve and

measure the minimum pressure values necessary to move and compress

the spring. Compare the measured values with the ones reported on the

Testing Certiﬁcate. If there are signiﬁcant differences you should contact

Flowserve Service Department.

A lockout device has been inserted

and forgotten in that position.

Disconnect the lockout module.

The valve does not shut

off properly and there are

leaks

The actuator is not correctly adjusted

Adjust the end stop of the hydraulic cylinder can until the valve is leak-

tight across the seat. Follow the instructions given in the paragraph about

travel stop bolts (2.3)

The valve does not fully

perform the stroke, during

opening and closing

The actuator is not correctly adjusted

As above, check the position of the end stop in opening and closing

direction. If necessary adjust them. Follow the instructions given in

paragraph 2.3.

Exhaust port(s) obstructed

Screw cap(s) must be disengaged. Ensure vent port are free. If not, clean

them of any obstruction and clean the dust excluders, if present.

Actuator torque lower than required

In order to do a check it is necessary to perform the following test: disas

semble the actuator from the valve and measure the minimum pressure

values necessary to move and compress the spring (if the actuator is

a single acting model) or the minimum values necessary to move the

actuator yoke and perform a stroke (for double acting models). Compare

the measured values with the ones reported on the Testing Certiﬁcate.

If there are signiﬁcant differences you should contact Flowserve Service

Department.

During the stroke the

actuator exhibits excessive

amounts of backlash.

Some components are excessively

worn.

Identify and replace these components, according to the procedure

described in the relevant paragraphs of this manual, or in special

maintenance operating instructions.

In case of other problems not listed in this table, you should contact Flowserve Service Department.

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Flowserve LHS Hydraulic Heavy-Duty Actuator Series User Manual Page 21

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