A servo valve is the “brain” of any hydraulic test machine, controlling the actuator to allow the machine to move and perform tests as required. Servo valves are fragile components, and require extra care and maintenance.
Take a look at some of our frequently asked questions for answers on how to keep your servo valves in peak condition.
Servo valves are the main control for hydraulic actuators, which in turn enables the movement of energy throughout the test machine.
A servo valve is a very sensitive and delicate piece of equipment, that is easily compromised by debris and contamination within the machine, so it is essential that servo valves are serviced so they can maintain their performance and control of the test system.
Filters and seals from the hydraulic power pack or from other parts of the test machine will break down over time due to general wear and tear and regular use of the machine. The debris from filters and seals will be carried into the hydraulic oil and cause contamination, and this is then carried through to servo valve and causes damage.
Sometimes when new hoses, filters or seals are being replaced or changed, external debris can get caught in the servo valve and cause damage. It is essential that replacing new parts or components is carried out in a clean, non-contaminated environment.
If a servo valve is compromised, the hydraulic system will become less responsive; the machine will be unable to achieve the required test parameters, which eventually affects all hydraulic parts of the machine.
If the servo valve is damaged, then this is usually an indication that there are faults or problems elsewhere within the hydraulic system, especially if the servo valve is being damaged regularly. An investigation visit may be required to find the fault within your system.
Servo valves can have an extended life if regular preventative maintenance measures are carried out.
Having regular oil sample checks will ensure the oil is good quality and not contaminated, changing internal filters annually reduces the risk of debris and contamination, and making sure that the oil within the system is cooled sufficiently; if oil is ran too hot, it will cook the oil and it will start breaking down, leaving debris in the valve and oil tank.
Yes, we offer preventative maintenance checks for all components of hydraulic test machines. Our calibration engineers carry out oil checks and oil sample analysis, replace filters, hoses and seals wherever needed, and checking accumulator pressures.
We recommend that preventative maintenance checks should be carried out every year, which can be combined with our annual calibration visits.
If you need to arrange a maintenance check, or would like more information about our calibration and preventative maintenance services, then please complete a contact form or call us on +44 (0)1384 382 253, and one of our calibration engineers will be able to discuss your requirements.
Rolls Royce Technical Approval for High Temperature and Environmental Testing
The Design, Manufacture, Commissioning, Maintenance and support of Materials Testing Machines. ISO 9001 - ISO 14001, Cert. No. 15997
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