TANK PRESSURE RELEASE VALVE SEALS QUESTION

Jump to latest Follow Reply
SilentSquirrel

SilentSquirrel

Member
Jun 1, 2019
1,792
1,109
The other Washington, United States
Hello members
I feel like a newby
This the kind of stuff I'm supposed to know already
Here goes
I have 2 tanks (90L & 60 minute) on which the fill set pressure release valves are no longer sealing properly.
My question are:
- Which seals do I use?
-Where can I find them

Attached are photos of the 2 release valves and the 2 tanks/fillsets

Thanks
Edward

Release Valves 1.jpg


Release Valve 2.jpg


Tank 2.jpg


TANK 1.jpg
 
Those are your bleed off screws, I guess. Not sure exactly the problem you're describing. Do you mean the bleed screws are not holding as pressure in your tank rises? Is there a white nylon (Delrin) "donut" that the screw closes against? Can you show a picture of the INSIDE of where those screw into?
 
Last edited:
  • Like
Reactions: rc4fun
Upvote 0
If you have calipers measure the i.d. of the screw hole or the outer diameter of the screw itself. You can get those Delrin seals off anywhere that carries pcp compressor parts (Aliexpress, Ebay, Amazon, etc.) I have a bunch of spares. IF you respond to your own post I'll send some. If you have your own compressor you probably got spare parts that came with it & might already have some. For the sake of clarity those "fill set pressure release valves" are bleed screws. Wasn't sure what you meant at first. Please answer & provide pictures if you can.
 
Upvote 0
Thanks for all the replies and good suggestions
With @Humdinger 's recommendation I have started shopping flat (not conical) seals
These seem to me to be soft seals with no hole in them, unlike the hard nylon washer type seals used on compressors and gauges
It will be a while before they get here

There is a photo of the inside of each bore attached for reference

FWIW
I installed an X ring of appropriate OD into the bore on one of the fill sets
With a deadhead in the line it held 220Bar. (tank valve closed)
However, opening the bleed screw at that pressure is darn impossible.
Certainly not a good solution for bleeding
Fortunately, the X-ring released some pressure after about 45 minutes, and it is now open

I'll try something else tomorrow

Edward

PS
@Gerry52
Thanks for the offer
I have a good supply of the seals you mentioned

STEM-tank 2.jpgSTEM-tank 1.jpg
 
Last edited:
Upvote 0
You must log in or register to reply here.
Top Bottom
Back
Home
Forums
Resources
Menu