Thanks for the link. One thing I noticed in those types of valves (also
see SP-8094) is they make use of bellows and other spring type devices
to help compress the components.
-Bob
On 05/30/2016 11:09 AM, Paul Mueller wrote:
As Ben said, I think most if not all vehicle cryo valves have short stems. I doubt this is any help at all, but here's some info on the Space Shuttle main fuel valve: https://www.nasaspaceflight.com/2011/06/sts-135-crew-arrives-tcdt-mfv-work-begins-ssme-3/
On Mon, May 30, 2016 at 9:52 AM, Robert Watzlavick <rocket@xxxxxxxxxxxxxx <mailto:rocket@xxxxxxxxxxxxxx>> wrote:
What kind of stem seal did they use? Was it the type where you
have a cone that squeezes into a sleeve?
I hadn't seen any short stem cryo models. It might be worth me
getting one to take it apart. Were these custom or off the shelf?
-Bob
On May 30, 2016, at 10:24, Ben Brockert <wikkit@xxxxxxxxx
<mailto:wikkit@xxxxxxxxx>> wrote:
To be clear, basically every vehicle I've worked on had short
stem cryo ball valves, and most of them did not leak. Torque
requirements are another issue, but it is not a universal truth
that all short stem ball valves leak out the stem.