Saturday, May 28, 2022

Flexible socket valves

Perry Joe CP

Whew!!! what a great response on my original post requesting info with part numbers on Flex socket valves. Too many responses to post but I can summerize….As a side note I have learned that USMC purchases their Bio elastic from Endolite. The original material is called Northvane and can be purchased at a discounted rate.

The valves are as summarized:
Otto Bock 21Y12
Super seal green dot USMC
Endolite 099135
Ipos 008001 with left hand thread
Lyn valve from ESP
USMC SFS valve

I believe I have my problem figured out….the sockets that failed are long residuum’s. We pulled the Bio elastic and attempted to reduce distal end thickness but failed to adequately provide sufficient thickness for the Otto Bock valve housing to purchase and remain seated. Thicker Bio elastic
(Northvane) 1/2″ upgraded to 5/8″ was suggested and should be helpful.

My next attempt will again include the Otto Bock valve and try for increased valve seat purchase. Another tip is to Vaseline parachute chord and install in the plaster model valve seat region prior to pouring plaster. Once the plaster is set, remove the parachute chord and you have a vacuum hole necessary for proper forming.

The valve I would most like to try, assuming Bock valve failure, is the IPOS 008001 it is similar in design to Otto Bock but utilizes a left hand valve body-this eliminates the tendency for the valve seat to loosen with normal use.

Another tip for seat leakage is to pour plaster in the distal end only extending proximally to approximately one quarter OAL , remove from model, reheat the socket material, reposition on plaster model and use parachute chord to reseat. We have done this succesfully with the SFS valve, generally a zip clip gun will aide in maintaining socket/valve seat seal.

Thanks to all responses!!! They continue to pour in!!!

Joe Perry CP

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