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This piston has 4 inches of throw... Assuming that everything but the bore and the tie rods are identical, it may make most sense to actually purchase a piston with much less throw, such as the 1691T69.
Solution No. 2: 4211K121
This piston has a 9/16" diameter with 304 Stainless Steel as the body material and a 4" stroke length. Some notable advantages of this option are:
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Again, it may make sense to go with a similar piston with less stroke length.
Solution No. 3: 5036K121
This piston has a 3/4" diameter with 304 Stainless Steel as the body material and a 4" stroke length. Some notable advantages of this option are:
- It will not rotate, which may provide some advantages against things unscrewing during deployment.
Disadvantages include:
- Two rods, which means that it probably will weigh more.
- Increased manufacturing difficulty associated with a diaphragm with two holes will need to mill instead of power tap it on the lathe–also may require a redesign of diaphragm mass saving cuts.
- Again, need to machine a new bore due to increased necessary throw length as well as bore material (we want to avoid having a steel pressure vessel).
- Correspondingly need to machine a new rod and purchase new tie rods.
Again, it may make sense to go with a similar piston with less stroke length.
Solution No. 4: 6453K119
This piston has a 3/4" bore diameter made from aluminum and has a 5" stroke length. Some notable advantages of this option are:
- The square end plates fit the form factor we have already used.
- Stroke length is exactly what we need, so it is a complete COTS solution that requires no adjustment. We could make mass saving cuts, change rod material (which is currently 303 stainless steel.
- It's port inlet is 1/8 NPT, which for what it's worth, we already have compatible fittings for 1/8 NPT. This shouldn't be a driving factor, just a perk.
Some disadvantages are:
- It probably won't save us that much mass.
When it comes down to it though, I'm not sure how different the different base plates are between pistons, because theoretically, the bore, main rod, and tie rods should be almost identical no matter which option we choose. For that reason, it makes most sense to go with this piston, because
Resources:
The following resources are useful materials for learning about pressure vessel and piston theory:
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