If you register, you can do a lot more. And become an active part of our growing community. You'll have access to hidden forums, and enjoy the ability of replying and starting conversations.

Davies & Metcalf Brake Ejector

Discussion in 'Locomotive Engineering M.I.C' started by Eightpot, Aug 27, 2008.

  1. Eightpot

    Eightpot Resident of Nat Pres Friend

    Joined:
    Aug 10, 2006
    Messages:
    8,086
    Likes Received:
    2,270
    Gender:
    Male
    Occupation:
    Engineer Emeritus
    Location:
    Aylesbury
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    On the lower part of side of the body of the vacuum relief valve below the actual internal relief valve itself is a loose 1/2" diameter ball retained there by a strap held on with two screws. When loose, this will permit air to enter the system.

    What is the exact function of this ball?
     
    Eightpot, Aug 27, 2008
    #1
  2. Steve

    Steve Resident of Nat Pres Friend

    Joined:
    Oct 7, 2006
    Messages:
    11,977
    Likes Received:
    10,184
    Occupation:
    Gentleman of leisure, nowadays
    Location:
    Near Leeds
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Surprised that no one else has responded on this one. As I understand it, it is to allow any moisture to escape. It is drawn onto its seat when vacuum is created.
     
    Steve, Sep 3, 2008
    #2
  3. Eightpot

    Eightpot Resident of Nat Pres Friend

    Joined:
    Aug 10, 2006
    Messages:
    8,086
    Likes Received:
    2,270
    Gender:
    Male
    Occupation:
    Engineer Emeritus
    Location:
    Aylesbury
    Heritage Railway Volunteer:
    Yes I am an active volunteer
    Sounds sensible. I've ploughed through all the literature I have on vacuum brakes and found nothing on this particular item. Thanks for the info.
     
    Eightpot, Sep 10, 2008
    #3

Share This Page