Vesconite Hilube solves bearing problem in ball valves by replacing acetal
A three piece ball valve
was specifically designed for high pressure
systems at 5000 psi.
The actual operation in the field required 3000 cycles over a five year period.
Acetal bearings had been used previously but only lasted 2 years. Acetal has a
lower compression strength than Vesconite Hilube.
To simulate field conditions in the laboratory, the test rig was run for 4 hrs
continuously with 3000 cycles executed in four hours.
The Vesconite Hilube bearing
was tested at 4 times the working pressure. The bursting pressure is 10 400 psi
The actual test was conducted at 180 bar (18MPa). The torque before and after
was 90 Nm.
The Vesconite Hilube bearings were inspected after the tests and showed no
wear.
It was found that acetal showed a much higher turning differential force than
Vesconite Hilube.
Vesconite Hilube has a much lower co-efficient of friction than acetal and avoids stick slip problems.
Updated Aug 05 2003
