Blow Moulding Soup of the Day 1

Some hints and tips relating to Moog parison programmers AND occasionally ‘weird stuff’ that won’t necessarily relate directly to the products or services we sell.

Of servo valves

  1. Many blow moulding machines use the Moog 76 & 760 series servo valve for parison control. Experience has shown that Moog’s 62 and 631 series valves are less dirt sensitive, less expensive to buy and service. Ask us about our exchange program.
  2. Never ever try and take the spool out of a servo valve – you will probably wreck to valve.
  3. Most Moog servo valves we get in for repair are damaged by heat, not blocked with dirt. Is your oil cooler blocked ? Do they forget to turn the cooling water on after a mould change?
  4. NUMBER CRUNCHING: Moog servo valves cost thousands of dollars, but 10% of the valves sent to us have no details of who sent it!
  5. Servo valve problems? Check that the filter dirt alarm switches are connected – they often aren’t Better still don’t fix the cause of the problem, just keep sending the servo valves to us for repair – we need the money.
  6. When sending valves to us for repair ask your engineers to fit a cover plate. Without the plate residual oil can make the box soggy and the valve falls out. The shippers insurance does not cover this as it was your fault. If fact he can charge you for the damage caused to other shipments. Insufficient packing is your fault.
  7. Trouble with Moog valves? You might be using one of the older types that are more dirt sensitive than newer models. Tell us what you’ve got, we’ll tell you if it’s the best servo valve for the job.
  8. LVDT transducers don’t go faulty as often as you might think! Unless the wires get damaged or you bash it then the transducer might be OK. Testing is easy.
  9. Companies that have fitted ‘off line’ continuous hydraulic filter units are all reporting a significant reduction in hydraulic problems. Don’t buy a mobile filter trolley for filtration. The only use of these units is filling up the hydraulic tank.
  10. Moog valve arrived today, hanging out of the box. Damage over $600. Not covered by DHL insurance as the valve had no cover plate and the oil leaked out, box got soggy. DHL considering charging for damage to other parcels.
  11. When sending Moog or other servo valves to us for repair, fit the cover plate (We know you have some !)