GTA

All Springer/NP/PCP Air Gun Discussion General => "Bob and Lloyds Workshop" => Topic started by: oldpro on August 20, 2018, 04:16:55 PM

Title: Valve stem closing force as a %
Post by: oldpro on August 20, 2018, 04:16:55 PM

 Bob/Lloyd what formula do you use to determine closing force of just the valve stem and closing force percentage of just the valve stem?

Title: Re: Valve stem closing force as a %
Post by: rsterne on August 21, 2018, 02:05:02 AM

The closing force of the valve stem is the stem area times the pressure.... For a 1/8" stem at 3000 psi it would be (0.125 x 0.125) xPI/4 x 3000 = 0.0123 sq.in. x 3000 psi = 37 lbs....

Bob

Title: Re: Valve stem closing force as a %
Post by: oldpro on August 21, 2018, 12:26:24 PM

 Thats substantial! Im working on a stemless valve so I can remove the 37lbs of closing force and the area in the throat the stem takes up.

Title: Re: Valve stem closing force as a %
Post by: rsterne on August 21, 2018, 06:24:48 PM

Remove too much force and how will you close the valve?.... *grin*….

Bob

Title: Re: Valve stem closing force as a %
Post by: oldpro on August 21, 2018, 07:40:13 PM

Quote from: rsterne on August 21, 2018, 06:24:48 PM

Remove too much force and how will you close the valve?.... *grin*….

Bob

The same way Im opening it LOL. Seriously thanks Bob.