....."I am intrigued as to where Derek's info comes from"
Certainly, so whilst with a lifetime in industrial hydraulic training, professional education with hands on experience in fluids & systems sealing, this includes most recently after retirement, being engaged in defence to review a multi million Euro marine hydraulic reliability/failure warranty claim that is still pending the awarding of costs Judgement in a Court in the Hague - there were no winners here, the fault lay with the vessel builder
However my comments here [collectively] on model check valve and pump ball selections are from a number of 5" gauge engine builders who I consider highly experienced
Having said this, I did not include any reference to use of chrome plated carbon steel balls (nor a 3 second loss of pump pressure]With respect to model engineering, really no different where some engine builders prefer cast iron piston rings, over Viton or Teflon, or graphited twine ring selections
Derek
Well Derek,
I never expected a run down on your professional life nor your professional education again as you did so many years ago on some other discussions.
I would have thought that you would have been quoting from your own experience with rubber balls and not from second hand information passed down by others.
Your quote
(If not, the hammering of the pump pulsation )to 1000 cycles/minute] will chew them to pieces in 5 minutesThe pump in bypass & non functional within 30 seconds ) You are quite correct about no mention to Steel balls but I would have thought that you would know that this is the recommended method of seating steel balls, you having such a distinguished engineering career.
So to conclude, anybody considering using Nitrile or Viton balls for pumps ,check valves and safety valves go ahead and give them a try.
They are easy to machine to take them and as the other 2- members testify are very good for sealing purposes.
Derek don't get fired up, it sounds very much like nobody is supposed to question Derek Warner but go and tell your Loco friends that they are talking thro' a hole in their hat
regarding the Viton balls, better than that tell them to machine the seats properly.
Jerry,
My apologies for jumping on to your thread, your blue paint looks good.
There will be no more interruptions from me
Have a good day
George.