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Understanding valves [beginner]

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sb327:
I made a couple of sketches with notes.

PLEASE BE AWARE. This is not intended to be all inclusive. The op asked about the basics and that is all I’m attempting to portray. The notes are only my opinions and very GENERAL in nature.

There are other combinations of poppets and seats. A ball in a seat can be a poppet.

Dimensions are not always critical to function. For instance, id of a plenum is not as critical to function as the wall thickness is to safety.

Lots to go over but here are some basics.

Dave

WobblyHand:

--- Quote from: Rob M on April 18, 2023, 08:16:17 PM ---very good cad work, this in the modern era may be a more important skill than machining.. As far as understanding the valve , i think your animation pretty much explains it. theres good youtube resources explaining it well




the plastic parts in a 1377 are nylon. The taper does the sealing on the check valve as I recall.
Something you overlooked in the rear drawing was the thrroat. the throat is a larger diameter section below the transfer port section , as you have it drawn , air could not passs the valve stem,

--- End quote ---
Thanks for the complement, it was and continues to be a struggle.  It wasn't that long ago that I learned CAD. 

Hadn't overlooked the throat (so that is what it is called!), simply hadn't drawn it yet.  Actually, I don't know what the dimensions are just yet.  The pic was but an instant in time of an unfinished model.  There appears to be a knife edge that seals the poppet as well that is not in there.  This modeling stuff for me is difficult, sometimes it is harder than the machining itself.  Messed things up this afternoon and nearly busted the model.  For some reason, the settings in the file were really far from the defaults and every operation started chewing up memory.  Just figured out how to fix the file so I can work on it some more.  Before I fixed it, the file would take 20 minutes to open... 

WobblyHand:

--- Quote from: sb327 on April 18, 2023, 09:19:19 PM ---I made a couple of sketches with notes.

PLEASE BE AWARE. This is not intended to be all inclusive. The op asked about the basics and that is all I’m attempting to portray. The notes are only my opinions and very GENERAL in nature.

There are other combinations of poppets and seats. A ball in a seat can be a poppet.

Dimensions are not always critical to function. For instance, id of a plenum is not as critical to function as the wall thickness is to safety.

Lots to go over but here are some basics.

Dave

--- End quote ---
Thanks Dave.  Even the labeled bits help a new guy like me.  There's a jargon to learn, which I don't know yet. 

The Crosman valve uses a flat poppet but uses a machined knife edge in the body for the poppet seat.  Maybe tomorrow I can finish that part of the model.  Now that I have my CAD program defaults under control... 

sb327:
I was aware the Marauder used that type seat (knife edge) but am not familiar with the model you are working on.

Good luck.

Dave

WobblyHand:
It's a 1322 valve, Crosman classic pumper.  Took it out of my 1322 when I flat topped it a few years back.  Been sitting in one of my airgun parts bins.  Thought I'd take it apart and figure out how it worked.

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