COMPONENTS OFFER ENGINEERED ‘VALVE STEM SEALS’
We manufacture high tech Valve Stem
Seals for many years. As the technology grew from umbrellas,
caps, wipers, sleeves or similar rubber articles to Valve
Stem Seal, the most important argument for the application
of Valve Stem Seal to engine manufacturers is reduction of
Oil consumption through Valve train. Our designs of Valve
Stem Seals fulfill the basic requirement of:-
Metered Oil feed over the Seal life.
Small power loss.
Long Useful life.
consistent oil metering small power loss and achievement of
the best life of Valve Stem Seal is the question of tuning
between the Valve Stem Seal design, the oil being used the
physical properties of the elastomer and the Valve Stem surface
(hardness & surface finish),
wiping effect of the Valve Stem Seal in the dynamic mode is
achieved through the radial force applied to Valve Stem, the
lip contact angle (Oil side), and the spring cantilever arm.
The most important, ‘radial force’ is achieved
partly due to the expansion of the polymeric sealing lip and
partly from the tensioned garter spring/metal ring. The oil
supply to the Valve components varies according to the sealing
lip can be influenced by design alterations in the sealing
lip geometry. Also they are designed to maintain the grip
of elastomer seating greater then the force exerted on the
Seal by the reciprocation of the Valve Stem in its working
conditions. Our Valve Stem Seals lead to:-
A reduction of oil consumption
A metering of lubricant to the valves
A reduction in exhaust valve coking
A sealing against gas leakage through gas contamination
A reduction of the noxious content of exhaust gases.
most important property demanded of Valve Stem Seal material
is thermal capability of elastomers with medium being sealed.
Today almost all Valve Stem Seals are being made of flouroelastomer
(Viton, Dyneon etc.) or PTFE because of high performance requirements.
Garter spring/Metal ring is required to give constant spring
force during entire useful life of Valve Stem Seals.
values of ‘Push on Force’ & ‘Pull off
Resistance’ have been established by us for automatic
fitment. As earlier discussed, the grip of Seal seating should
be more than force exerted on the Seal by the reciprocation
of Valve Stem. For this we have specially designed imported
equipment to determine ‘Maximum Push on Force’
& ‘Minimum Pull off resistance’ of Valve Stem
Seal at elevated temperature.
Stem Seals are basically Oil Seals but are not designed for
complete oil Sealing. They are designed for oil metering over
longer period of life so that Valve Stem Seals should be able
to retain the oil and also allow some quantity of oil to pass
through annulus between the Valve Stem outer diameter and
the Valve guide inner bore to avert Valve train seizure.
are fully equipped to design, develop and test the Valve Stem
Seal. Various equipment like performance test rigs and fitting
force test rigs have been installed and expectations of various
OEMs are being met.