Hi Rate Compression Spring for PCP

[jpigg55]

I found this video that describes how a PCP regulator works: https://www.youtube.com/watch?v=h9CRxVw_vVs
What I'd like to know, or find out, is how to match the spring to the desired pressure. Anyone know where this info could be sourced ?

[RayH]

The pressure desired in the valve chamber divided by the area of the piston head equals the spring load.
That does not include a friction factor but it will get you in the ballpark.

Checkout one or more of the linked catalogs to see if a stock spring will fit your requirements.


https://www.asraymond.com/catalogs.html

[jpigg55]

Thanks Ray, but I'm not sure how springs are rated.
The info I'd need is the compression force range over distance for the spring itself.

[RayH]

Thanks Ray, but I'm not sure how springs are rated.
The info I'd need is the compression force range over distance for the spring itself.

That info is in tables in the catalogs you'll find in the linked site.

[PJB]

Force is the spring constant x deflection.    The catalog should specify eg lbs/in etc.   


Sent from my iPhone using Tapatalk

[RayH]

In the Die Spring Catalog they give you at least FOUR data points of LOAD (same as FORCE) vs DEFLECTION. Plot those four points on a graph and connect the dots. That line (curve?) represents the recommended useful range of that particular spring. What is the difference in deflection? What is the difference in load? Divide the load difference by the deflection difference. That is the spring rate (spring constant).

In the Compression Spring Catalog they specify SPRING RATE (lb/in) in the far right hand column.

It's all right there.

[jpigg55]

Thanks, I goofed initially trying to open with IE. Didn't work so well.
Tried again with FireFox and it worked.