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Amp reg. Belleville washers question
- Thread starter allenbowles
- Start date
When you fire a shot, the pressure in the plenum drops. In response to the pressure drop, the Belleville washers (spring washers) push the regulator seat open and allow air to transfer from the reservoir to the plenum to replenish it. As the plenum pressure builds, the Belleville washers compress ever more until the valve seat closes.
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Generally, no. That is unless there is something that is affecting the repeatability of the stack height each time it cycles back and forth. Prime examples would be gnarly Bellevilles with burrs and/or a poor fit between the piston and the ID of the washers such that they can move laterally relative to each other.
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Some common and not-so-common causes of high ES to consider:
1. Is the hammer spring tension adjusted to the velocity knee (95% - 97% of peak velocity)?
2. Tube and hammer smooth, dry, and free-sliding? Dry lube is best.
3. Possible sear drag? Is it a direct sear or drop sear trigger group?
4. Weak valve return spring?
5. Failing breech O-ring or transfer port seal? They will lose varying amounts of air for each shot when they are just beginning to fail.
6. Air cushion building up in front of the hammer as it flies forward? Is the tube or hammer vented/slotted to prevent that from occurring?
7. Hammer spring not supported sufficiently by a spring guide?
8. The pellets themselves. Varying weights or varying diameters will contribute to a higher ES.
Do you have a full shot string you can post? Or if it’s a regulated gun, at least 15-20 shots while still on the regulator and continue until the velocity falls off by at least 10%
1. Is the hammer spring tension adjusted to the velocity knee (95% - 97% of peak velocity)?
2. Tube and hammer smooth, dry, and free-sliding? Dry lube is best.
3. Possible sear drag? Is it a direct sear or drop sear trigger group?
4. Weak valve return spring?
5. Failing breech O-ring or transfer port seal? They will lose varying amounts of air for each shot when they are just beginning to fail.
6. Air cushion building up in front of the hammer as it flies forward? Is the tube or hammer vented/slotted to prevent that from occurring?
7. Hammer spring not supported sufficiently by a spring guide?
8. The pellets themselves. Varying weights or varying diameters will contribute to a higher ES.
Do you have a full shot string you can post? Or if it’s a regulated gun, at least 15-20 shots while still on the regulator and continue until the velocity falls off by at least 10%
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i have them in my labradar,but i would not have a clue how to post it.(i will work on that.) btw 22 fx crown shooting fx 18.13 pellets 500mm barrel 860fps.tryed up to 930. have not changed #4 above,i have a new one i will change. thanks
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