high pressure piston seals
high pressure piston seals
(OP)
What are the leak paths involved in this kind of high pressure piston seals. trying to understand the sealing mechanim in this kinda high pressure liquid seal. We have three seals. on a test pump middle seal have more wear than the first one and third one. What does that mean? First seal didnt energize? Can somebdy explain how these seals work. Please see the attachment for picture.





RE: high pressure piston seals
Its sole mission is to prevent an immediately adjacent seal from extruding itself between the piston and the cylinder.
The seal should be in the middle of the groove, surrounded by backup rings.
Consider the possibility that your pump is assembled incorrectly.
Mike Halloran
Pembroke Pines, FL, USA
RE: high pressure piston seals
Or this one? http://www.kolbenringindia.com/piston-ring-gaps.ht...
Or this one? http://www.grovercorp.com/rings-and-seals/step-cut...
If the middle seal is worn more, the outer two must be working well and the middle seal lacked lubrication, was very dry.
Ted
RE: high pressure piston seals
RE: high pressure piston seals
I have had your experiences a lot with Chevron Packing or vee seals. They are good at high pressures, but experience fluid bypass before their surfaces flex to energize. Sometimes I just put a soft seat I between the packing. Three up, o-ring then three down is my arrangement.
Maybe. You could do the same? Good luck with it.
Regards,
Cockroach
RE: high pressure piston seals
Ted
RE: high pressure piston seals
Stepped rings leak through the steps in most cases it gets worse as the pressure expands the housing.
UHMW is possibly the worst material choice you could make for high pressure.
Ed Danzer
www.danzcoinc.com
www.dehyds.com