Product's categories
|
Introduction a braid packing
Braid/stuffing box Packing products
are used by industry to insulate
shafts, rods and seats to prevent
escapes of Gas or fluids. The main
fields of application are:
- static seals (covers, frames, furnace
doors, boilers);
- stem seals (valves);
- moving shaft seals (plunger
pumps);
- rotating shafts (centrifugal pum-ps,
mixers, stirrers).
Characteristics
Depending on the end use, when
selecting the type of braid/stuffing
box Packing required, certain welldefined
and basic characteristics
used to distinguish the various types
of Packing need to be borne in
mind. In particular, we recommend
assessing:
- flexibility, to avoid stretching and
twisting due to deformation in the
Packing structure when laid in rings;
- elasticity and elastic return, to
guarantee tightness under pressure;
- homogeneity, acting as a guarantee
of efficient service and longer
life;
- compact external surfaces, guaranteeing
tightness while avoiding
excessive tightening pressure and
possible wear to the shaft;
- impregnation to the heart (also
known as yarn-by-yarn impregnation),
offering guaranteed tightness
to improve efficiency and the value
of the application.
Components
Braid/stuffing box Packing products
have different components to suit
their different applications. The main
components are:
- graphite fibres (providing extra
chemical and thermal resistance);
- insulating glass and ceramic fibres
(generally used for static thermoresistant
seals);
- vegetal fibres, such as cotton,linen, ramie fibre and hemp (especially
suited to applications with
cold water and where hard-wearing
qualities are required);
- synthetic fibres, such as ptfe, polyester,
aramidic and acrylic fibres
(suitable for producing Packing with
high resistance to chemicals and corrosive
agents);
- metals, such as stainless steel,
copper and inconel (used to strengthen
the Packing and thus increase
its mechanical strength at high temperatures
and pressures);
- lubricants and binders, essential
when using Packing as these must
not attack the contact fluids or corrode
the metals insurrounding the Packing
or any metal in this, while at the
same time eliminating friction. This
category includes mineral, vegetal
and synthetic oils and greases (for
universal use), dry or dispersed graphites
(for external treatment with
excellent self-lubrication and antifriction
properties), dispersed (for
lubrication and anti-friction treatment
on Packing coming into contact
with chemicals and corrosive
agents) and Molibdenum disulphide
MoS2 (used in external treatments
with particular self-lubricant and
anti-corrosive properties).
|
