Introduction of eccentric reducing rubber expansion joint
Eccentric reducing rubber expansion joint can solve the problem of different
diameter when connecting to metal pipe, has the effect of the
damping noise reduction at the same time, and can save piping
parts, saving cost. It consists of inner rubber, fabric reinforced
layer, middle layer, outer layer, end reinforced metal ring or
steel wire ring, metal flange or parallel of union.
Characteristics of eccentric reducing rubber expansion joint
With high pressure, good elasticity, large displacement, balancing pipe
deviation, absorption vibration and good noise reduction effect,
convenient installation and other characteristics, eccentric
reducing rubber expansion joint can be widely used in water supply
and drainage, circulating water, hvac, fire protection,
papermaking, pharmaceutical, petrochemical, ship piping system,
water pump, compressor, fan, etc.
Classification of eccentric reducing rubber expansion joint
Generic class: suitable for conveying water that the temperature is -15~80°C and the acid solution or alkali solution that concentration is
Special classes: suitable for special performance requirements,
such as resistance to oil, plug, ozone, abrasion and resistance to
Heat-resistant class: suitable for conveying water that temperature
is higher than 80°C.
Main performance and functions of eccentric reducing rubber
1. Pipe – the pump installation: the eccentric reducing expansion
joint is used to prevent cavitation, when installed at the entrance
of the pump, it generally should be installed roof flat, thus
prevent the pipe gas accumulating in the pump inlet, form big
bubbles into pump cavity, and damage the pump.Only one case can be smooth installation. That is behind the head
size directly after bending elbow upward. In this case the gas
phase may not accumulate.
2. Pump, pipeline concentric reducer installation: there are
differences between the pump export DN and outside pipeline system.
Using the concentric reducing expansion joint, which can realize
the two pipes of different size linear connection, the realization
of variable diameter pipe fittings.
Eccentric reducing rubber expansion joint axial displacement is:
rubber joint’s elongation or compression is in line with the fluid
flow direction (that is, the central axis direction).
Eccentric reducing rubber expansion joint lateral displacement is:
rubber joint’s axis displacement is in a direction perpendicular to
the flow direction.
Eccentric reducing rubber expansion joint angular displacement is:
rubber joint of two end face of the Angle sum of the vertical
centerline and the original axis.
Material list ofeccentric reducing rubber expansion joint:
Polyester cord fabric
Steel wire rope
Rubber expansion joint production progress
(1) Raw material: we never use reclaimed raw rubber, rubber is
imported from USA. Before used, raw material should be tested,
including physical test and some chemical experiment to test the
hardness and so on;
(2) Rubber pretreating and ingredients;
(3)milling: first, rubber plastication, second, rubber mixing, we
will add rubber compounds, like sulfurzing reagent, surfactant,
softener, stabilizer, foaming agent and some special compounds, at
the same time, rubber will be extruded into plates, cut, produce 45
degree angle. The plates cannot directly be used , they should be
cooled about 24 hours;
(4) Molding: it will cost much time;
(5) Vulcanizing: the largest vulcanizing tank in Asia ø5000*15000,
right time, temperature, pressure is very important;
(6) Test and experiment: these tests should be done, hydraulic
test, resistance to vacuum, displacement of the performance, rubber
physical properties, thickness and the strength and other quality
(7) Package: out package the free of fumigation wooden case; inside
package: plastic film and textile membrane.