INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Dungs gas valve problems

Dungs gas valve problems

(OP)
My problem is with a Dungs MVD 515/5 (1 1/2") gas valve here in Australia. It replaced an old 215/5 which had a burnt out rectifier board. Local agent did not have the same so supplied the higher pressure rated version. Has a 110VAC coil for this particular site. It worked for about a month. Then would not open unless the body was given a thump with your fist. The installation as with the original is with flow vertical up, so coil axis horizontal. This is approved by Dungs. Opened up valve and found no foreign material in the valve. Noted that the valve armature/ slug had a black finish (See attached). Like metal blueing. Have since found out it is a nitriding finish called Corr-I-Dur. The surface finish was not smooth and there was signs of rubbing on this coating. We have never seen this type of coating on a Dungs valve before. Also the small guide pin/spindle has a small wear ridge in it. No sign of any lubrication on either. From the markings it looks like the assembly has "cocked" and misaligned. We polished it up on a lathe with very light emery. The coating came off easy and produced a smooth silver finish. Sprayed on some Teflon dry lube on armature and spindle and refitted. There have been no problems since over the last few weeks. Have checked supply voltage OK. Pressure to this valve is natural gas at only 5.5kPa (The valve is rated to 50kPa). So far Dungs have been unhelpful. They say both the armature and the pin slide in a plastic bush and don't need lubrication. However the agent opened up another similar valve and found grease on the pin. We found no sign of any grease anywhere. Has anyone any ideas or experienced the same? Maybe specifically with a 110VAC coil?? Rod.

Rod Nissen.
Combustion & Engineering Diagnostics

RE: Dungs gas valve problems

You have double posted this. please delete one of your posts.
B.E.

You are judged not by what you know, but by what you can do.

RE: Dungs gas valve problems

(OP)
As far as I am aware it is posted in another forum only, which may have people who have had exposure to a similar problem. If you can't help, why is that of your concern?

Rod Nissen.
Combustion & Engineering Diagnostics

RE: Dungs gas valve problems

Rod you have been on here long enough to know the administrators don't like the practice and will red flag you for doing it, at least link the two posts so that others know what you are up to.
I will not say any more on the subject and will not respond to any further posts.
B.E.

You are judged not by what you know, but by what you can do.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close