Servo Valve Tester | Proportional Valve Tester
Tests most popular makes of Servo valves and many Moog Proportional valves used on plastic moulding machinery.
- Minimise machine downtime - Quickly diagnose problems.
- Rugged metal case for typical workshop use.
- Automatic powers on when plugged in - no more flat batteries
Rapidly diagnose problems - save money
Our valve testers are designed to enable maintenance engineers to rapidly fix problems with parison programming and mould movement systems. Being able to manually drive the valve helps you to easily decide if the fault is hydraulic or electronic. This simple procedure can save hours of expensive machine down time.
Servo And Proportional Specific Testers - no compromising
We produce two testers. One for the servo valves that are typically used with parison programmers. We have another model designed specially to check the Moog proportional valves used on mould speed control.
Easy to Use
Using these testers is as easy as counting 123...
- plug them in
- turn the control knob
- observe the cylinder movement.
If the valve is performing normally you should get smooth, fine control of the cylinder's position and speed. If the cylinder moves normally then it is most likely that the electronic unit that drives the valve is the problem. This immediately eliminates the many hours wasted by engineers trying to decide if the problem is “electronic” or “hydraulic” The proportional valve tester also has a meter to show the actual position of the main spool.
Why do valves go wrong?
In blow moulding, the commonest cause of servo valve failure is HEAT. Either the hydraulic cooling water was shut off, or the valve sat “cooking” on the head with the “heats” on, and the hydraulic supply turned off. The oil inside the valve turns to a thick gummy mess, and the valve cannot operate. Additionally the heat turns the “O” rings brittle and the valve will then leak. Hydraulic filtration is also important and we recommend that the pressure line filter element is changed at least once a year. Always ‘cap off’ hose ends and open ports when performing head changes.
Why do proportional valves go wrong?
Most machines have a separate filter in the pressure supply to the pilot stage of the proportional valve. It is very important that the filter element is changed whenever the dirt indicator switch is energised. This is particularly true with older valves that were of a more dirt sensitive design. Unlike servo valves which are virtually always have a ‘closed centre’ ‘zero dead-band’ characteristic, there are numerous different types of proportional valve