The
expansion joint consists of one corrugated pipe and two structures,
it absorbs the axial displacement (also a part of lateral displacement)
of pipelines via flexible deformation of the corrugated pipe, both
ends of the expansion joint are connected with pipelines. In order
to ensure the expansion joint is not damaged during transportation,
the rigid support for the corrugated pipe is often fitted with fixing
bolts, which are removed after the product is installed. Instruction
for application: this type of expansion joint is mainly applied
for compensating axial displacement, and can also be used to compensate
lateral displacement with small compensation amount or axial and
lateral resultant displacement. The capability for compensating
angular displacement is available, but in general the expansion
joint is not used to compensate angular displacement. In this series
products the compensation amount is fulfilled by single-layer corrugated
pipe, if it is replaced by double-or-multi-layer corrugated pipe,
the compensation amount will be greatly increased. The pull rod
in the middle of pipe plays a role of guaranteeing rigid support
for corrugated pipe during transportation and installation of the
expansion joint, the fixing bolts must be unscrewed after installation.
Application and principle
he
pneumatic three-way changeover valve is a commutator separating
the materials conveyed in one way into two ways. The valve is advanced
and reasonable in design, convenient and reliable in operation,
and provides a reliable commutator for positive-pressure air conveyance
in pipelines. This valve is extensively applied in conveying system
of thermal power plant for conveyance of dry, loose solid materials
such as dry ash, raw cement, limestone, pulverized coal and other
powder materials. The sealing element in changeover valve is made
of wear-resistant ceramic material and combined after match grinding,
and can maintain reliable sealing for valve port passage with contact
by plane and being pressurized by spring. The changeover valve is
equipped with a pneumatic device (cylinder) enabling the valve to
stop in proper position.
Main
technical parameters
Working
Pressure：0.3MPa 供气压力：0.4-0.6MPa
Suitable
temperature：-20℃<t<150℃ 密封试验：1.0MPa
|
