Vulcan Onshore Tip #41: Valve Flutter

In “Vulcan Tip No. 3” issued some time ago, the subject of “Valve Flutter” was covered in part by various methods of control. This problem occurs in older hammers frequently and in some cases in newer hammers when operated on compressed air. In addition to the solutions shown previously, there is another field remedy that is easy to execute.

  1. Remove the Blind Steam Chest Head from the Hammer.
  2. As shown in the drawing above, drill and tap the center of the Blind Steam Chest Head for standard 5/8″ UNC Thread.
  3. Install in this tapped hole a Square Head Cone Point Set Screw 5/8″ x 1-1 12″ with a 5/8″ UNC Jam Nut as shown.
  4. Reinstall the Blind Steam Chest Head on the Hammer.
  5. Tighten the Set Screw so that a moderate amount of pressure is exerted on the end of the Valve Stem. Readjust until Valve Flutter is eliminated and lock Set Screw in place with Jam Nut.


  1. Do not exert excessive force on the Set Screw. This causes excessive wear on the Open Steam Chest Head Bushing.
  2. Use only “Cone Point” Set Screw. This minimizes “drag” on the Valve Stem.

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