Rusty Shackleford
Contributor
Should these be higher than a 70 duro? What is the proper hardness for these O-Rings?
HP Hose and Port Plug O-Ring Durometer
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90 duro
axxel57
Contributor
Depends on the manufacturer. Mostly offered in DURO 70 they don't make any problems.
I've seen what seemed to be DURO 85 on few HP hoses and plugs, never DURO 90.
It's p.i.t.a. to install and remove the D90s without risking damage and since they are just static seals I don't see any benefit using them on those applications.
Different thing with o-rings which are used in dynamic applications like the piston shaft o-ring on balanced 1sts......
I've seen what seemed to be DURO 85 on few HP hoses and plugs, never DURO 90.
It's p.i.t.a. to install and remove the D90s without risking damage and since they are just static seals I don't see any benefit using them on those applications.
Different thing with o-rings which are used in dynamic applications like the piston shaft o-ring on balanced 1sts......
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Depends on the manufacturer. Mostly offered in DURO 70 they don't make any problems.
I've seen what seemed to be DURO 85 on few HP hoses and plugs, never DURO 90.
It's p.i.t.a. to install and remove the D90s without risking damage and since they are just static seals I don't see any benefit using them on those applications.
Different thing with o-rings which are used in dynamic applications like the piston shaft o-ring on balanced 1sts......
spec for most manufacturers is 90 and is what ships with most parts kits that I've seen. Installation is much easier with the piston installation tools so they don't fray over the threads
+1
The mfrs that use 70 duro have a deep land for the o-ring, and a port plug cap that fills the hole completely.
For those mfrs that specify it (e.g., Poseidon old regs), duro 70 will seal better if the port is scratched, because its softness conforms to the land, and their land is designed with tolerances not to extrude.
The risk in using it with other brands is that it may extrude if there is the slightest gap.
As noted above, 85-90 shore is the standard for this area for most mfrs, and you will likely not go wrong this way with ANY first stage HP port plug or hose.
Last edited:
OP
Rusty Shackleford
Contributor
Thanks everybody!
axxel57
Contributor
Just checked, yes, most mfrs nowadays use Duro 90 for the HP port plugs, thanks for correcting.....
Jonny Wishbone
Contributor
According to Vance Harlow's Regulator Maintenance and Repair book you can use 70 on Low Pressure applications and 90 on HP applications.
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