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Old 11-11-2017, 01:38 PM   #21 (permalink)
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You can relocate the vent so that the piston seal does not need to pass it, that will prevent it from potentially air locking and give you more adjustability. It will need to be a very small hole, or tap it for a needle valve to adjust it. That should add some seal reliability to the piston too, not having to cross that port.
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Old 11-12-2017, 12:12 PM   #22 (permalink)
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Originally Posted by y0da900 View Post
You can relocate the vent so that the piston seal does not need to pass it, that will prevent it from potentially air locking and give you more adjustability. It will need to be a very small hole, or tap it for a needle valve to adjust it. That should add some seal reliability to the piston too, not having to cross that port.
I don't understand. If the piston seal doesn't pass the vent, then the valve won't....um, vent. If it doesn't vent, then it won't pulse. The piston will stay pushed out until the trigger is released.
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Old 11-12-2017, 12:22 PM   #23 (permalink)
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I think he's saying put the vent in front of the piston seal, not behind. It will ALWAYS be venting, but if the vent is small the pulse will still drive the piston before enough air escapes (needle valve would control how fast it can vent). Tradeoff a little efficiency for reliability and durability
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Old 11-12-2017, 07:00 PM   #24 (permalink)
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I think he's saying put the vent in front of the piston seal, not behind. It will ALWAYS be venting, but if the vent is small the pulse will still drive the piston before enough air escapes (needle valve would control how fast it can vent). Tradeoff a little efficiency for reliability and durability
Okay. I think I understand that. It could work. The Fabco MSV valve always vents when the trigger is pulled....I wonder if that's why.

The more I got to thinking about it, though, the more I started wondering what would happen if I rearranged some of the design. After some work, I think I've come up with a different approach. This design needs an extra o-ring to work, but the single transfer point (with the two o-rings in the middle) will be much easier to place that separate in and out ports. And the o-ring in the front, if positioned right, should help the piston vent.

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Old 11-12-2017, 11:04 PM   #25 (permalink)
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I can see one small issue with the latest design. The piston vent speed will be related the speed at which the trigger is released.

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