Pneumatic
seals
are any of a class of seals used in applications including rotary or
reciprocating motions. They are often used in pneumatic cylinders and
valves. These seals require minimal lubrication when exposed to air
in order to create a tight seal. A pneumatic seal may also be exposed
to high operating speeds at which the pressure is not high. The
difference between a pneumatic seal and a hydraulic seal is pressure.
This kind of seal typically has a pressure range of 1 to 150
pound-force per square inch (psi), while hydraulic pressure can reach
greater than 10,000 psi.
A
pneumatic seal's sealing orientation can be internal as with a rod
seal, external as with a piston, symmetrical, or axial. With internal
seals, a housing bore surrounds the seal and the sealing lip touches
the shaft. This seal requires very little lubricant. In an external
piston pneumatic seal, the seal surrounds a shaft and the sealing lip
touches the housing bore. This system requires more lubrication.
Rotary
applications need only one pneumatic seal. This seal is considered to
be single acting because it can seal in one axial direction while the
application is moving. On the other hand, a reciprocating application
requires two pneumatic seals, or double acting seals. In this case,
one seal is needed for each of the directions. A double acting
pneumatic seal is more complicated than single acting ones. . These
seals can be single or double acting. Single acting pneumatic seals
are used for one axial direction only. These seals can be made of a
variety of materials like Polyurethane, Nitrile, Viton, Silicone,
EPDM and some PTFE. Common pneumatic seals include rod seals, piston
seals, symmetrical seals, V-Rings, wipers, rotary shaft seals, wear
rings, static seals, back-up rings, o-rings, buffer rings, u-cups and
gaskets.
Sometimes,
composite seals are used in pneumatic applications. Composite seals
are seals composed of two or three different materials. Therefore,
these seals are often found in products requiring one seal for many
parts. Composite seals are also used in the diesel engines for
trucks.
The
market comprises several leading brands that manufacture high quality
sealing products. It is imperative to invest only in the finest
quality so as to ensure the safety of your application. Seal failures
have been known to cause substantial damage. The applications of
these seals range from high-end rockets used in space missions to
automotive and aerospace engines. They are also used in the oil and
refinery industries, as well as vacuum applications. Military
applications need to rely on the usage of high grade that will with
stand rugged and extreme applications. No matter what the nature of
your application, the seals used therein should always be sourced
from a reputable supplier. The quality, durability, specifications,
and pricing are just a few aspects that you would need to take into
consideration while choosing with pneumatic applications.
Darcoid
nor-cal seal offers several different grades and types of compounds
for all your application needs. Darcoid nor-cal seal is into supply
of pneumatic seals, emi shielding gaskets and seals, o-rings, molded
rubber parts, electro magnetic inference or rfi shielding products
like adhesives, sealants, conductive compounds, conductive elastomer
gaskets, conductive tapes and laminates, conductive grounding tabs,
metal emi products, o-rings and d-rings, shielding windows, shielding
electro magnetic inference vents, thermal grease and gap fillers,
wave guides, wire mesh gaskets and many more. These products are used
in various sectors like industrial, medical, agro, aerospace,
military and more. Darcoid has a vast experience in the many
industries and offer the design engineering capabilities to deliver
the exact solution for your applications in regard to all kinds of
sealing solutions.
