Vevor compressor failed

[Xraycer]

Just an aside tip-when you have a screw set with loctite in a small space a soldering iron on the screw will usually loosen it effectively.

Excellent tip!

[Fly]

Well after my ordeal with mine I did take the head off & looked at the sec stage seal. I can make some up, & it looks to be made
out of Delrin plastic. I will look into buying some Monday. I will get back to you guys. But still keep your eyes out for a part source.
The sec stage seal is the same dia as the YH that dia was posted. I bet that piston & seal would work in these. I did mic the OD of
my seal while I had the head off but did not take it off the piston. I was just trying to get mine running.

These compressors really look very good over all. I bet we will have them figured out soon with all the info being shared.

                                                                                                Fly  

[MJP]

I doubt it very much of being delrin, if so its a c.rappy design. Should be graphite infused teflon.

Marko

[Ydoggy]

Can't complain as these chinese clones are getting high pressure air more available to pcp'ers that are hesitant to enter the market... good for the sport.

That said, I've been in the industry where these chinese companies don't quite reverse engineer, but flat out copy designs to a cheaper version.  The design specs are usually missed and these issues pop up as a result.  Using delrin as a high pressure seal is one example.   There are others associated with the various failures in the threads. 

Can't beat the cost for a low quality pump nevertheless. Superior from that point of view.

As an aside, the solder iron tip to loosen the loctite is a fantastic idea! 

[hollowpoint1911]

I agree with MJP, these high pressure seals are not made with straight delrin. If you think our current high pressure seals already rapidly degrade, a straight delrin replacement is going to break apart in 1/4 to 1/2 the time.

Jefferson State Air Rifles / oldpro has been looking into making replacement seals and I think he's using a polymer that's either carbon or graphite impregnated...I can't remember exactly what it was from a old post.

The diameter of the second stage piston is the same across the Yong Heng and all of the other single cylinder clones, but there's at least 3 different styles of seals. My YH head uses a 2-piece seal with a green inner Oring, around a polymer outer ring. My Vevor head uses a 1-piece conical seal attached with a screw at the end of piston assembly. The 3rd style that comes to mind is a 2-piece seal that is split into 2 halves that make a circle when they are attached. It's pretty easy to get replacement seals if you need any of the 2-piece designs via AliExpress, but it's that 1 piece conical design that's currently hard to source. Hopefully oldpro pulls through soon with his work though.

[bandg]

I've seen pictures of a YH labelled compressor that had 3 individual split rings for the high pressure piston and another that had 4 individual rings.  Seems these pictures were linked off the Facebook PCP Compressors group page but I can't find it now so I may be mistaken.  Apparently there are several styles of seal for the high pressure piston, from the Vevor cup style to those noted above to the YH ring style I saw.  The rebuild I saw showed the gentleman removing the rings and they were quite flexible, almost rubbery.  Would graphite impregnated Teflon (or any other material) be that flexible?

[Fly]

This tread is so funny. I try & help some & everyone is now a exspert on plastics. I worked with plastics for 22 years running
a R&D proto type machine shop machining & injection molding plastic parts for a Dutch medical manufactor. I,m pulling my
offer, sorry. 

                                       Fly

[MJP]

What offer? I'm confused.
Have been making high pressure seals, valves and what not for one big gas comppany, but what do I know.
You can keep your thread.

[Fly]

What offer? I'm confused.
Have been making high pressure seals, valves and what not for one big gas comppany, but what do I know.
You can keep your thread.

By reading your past post, from other threads you know more than the rest of us for sure. I did not come to this form to argue with
anyone. I,m always welcome to discussion but nothing productive in argument. I,m new to air guns & here to learn, & I,m not a guy
that subscribes to mine is bigger than yours argumentative discussions ether. So lets just leave it be at that. 

                                                                           Fly

[oldpro]

 They are using bronze infused PTFE no doubt about it. Ive been attempting to find a better solution but the compressor has very poor oiling and high heat loads due to the RPM and pressure. I havent been very successful improving the design so far but Im working on it. The RPM is so high that its hard to keep the seals from wearing really fast and like I said very poor lubrication. This has been a challenge.  https://www.fluorotec.com/materials/ptfe/bronze-filled-ptfe/

[Fly]

Well before I ordered this compressor, I had started on a motorized hand pump using a variable speed motor. I may just finish
that & junk this thing. I should have never invested in PCP air rifles & stuck with my other guns.

                                                                                       Fly

[Wayne52]

If I do get anything before the snow flies I'm seriously thinking about the shoebox, yes they cost more, yes you need to run them from a shop compressor but they're pretty much time proven.  They may be slow but they do get the job done.    Oh they're totally rebuild capable too, from what I've seen they flat out work and keep working with very little TLC.

[oldpro]

If I do get anything before the snow flies I'm seriously thinking about the shoebox, yes they cost more, yes you need to run them from a shop compressor but they're pretty much time proven.  They may be slow but they do get the job done.    Oh they're totally rebuild capable too, from what I've seen they flat out work and keep working with very little TLC.

Wayne if your going that route consider this instead http://www.altaros.cz/en/other-accessories/48-altaros-compressor-booster-unit

[Fly]

Ole Pro. What in that black wire with a probe that plugs in to the head on these compressors? Is it a temp probe that controls something? 

                                                   Fly

[MJP]

It's just a temp probe for the lcd readout.

[Fly]

Thanks I thought it might be. It was hanging out when I got it. When I ran the compressor it was not showing it was rising
in temp much. I guess that's why. But I keep feeling the head & it was just warm, though I have not run it under much load yet.

                                                                                       Fly 

[cootertwo]

OK, I looked at my new yung heng 220 volt model, and the plug is NOT a 110 plug. Both of the flat prongs are at an angle.

[Fly]

Great now lets start it up, open the valves & break it in.   

                                                         Fly

[shinyknight]

I got the same Yong Heng clone too. I went with it cause it was cheaper plus has an auto shut off. The Yong Heng auto shut off is 220v, I wanted the 110, so that's why I went with the clone. anyhow, I took my apart to clean and now it's leaking from the SS pipes. I took them off, tight them back and still leaking air. Could go over 1000 psi. no matter what I tried leaking air. Anyone know if the Yong Heng style head will fit on this vevor clone? Thinking nof either just replacing the whole head assembly. But don't want to drop $69 if it doesn't fit. Anyone have this vevor compressor that install the Yong Heng head on? All the SS pipes are different so not sure will line up.

[MJP]

Leaking from the pipe and flange nut? Check if there are scratches on the conical nipple.
If there are you could chuck it on a drill chuck if you have large enough, and use a fine file to smoothen the cone while rotating it in the drill.
Kind of like a miniature lathe.

Marko