Metal Bellows Correctedn 7/11/00 6:40 PM Page 74
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X-PRESS EXPANSION JOINTS
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Features
• Long axial movements
• Self draining convolutions
• Integral cover and liner
• Leak proof – packless
• Maintenance free
• Integral guide ring
• 5 Year Warranty with alloy 625 bellows
The X-Press bellows absorbs a very long stroke that minimizes the number of expansion joints required for a
typical installation. Inherent in the design are internal guide rings, a full thickness cover, self draining
convolutions, and an integral liner that is insensitive to flow direction. The internal guide rings permit the
designer to reduce the number of guides compared with a conventional internally pressurized bellows system.
The full thickness cover is designed to contain the full pressure of the system. If a bellows leak were to occur,
flow is directed along the pipe rather than radially toward personnel. The heavy wall cover is also very easy
to insulate due to its nominal pipe size. The self draining convolutions eliminate the possibility of sediment
and residue collecting in the convolutions and causing corrosive attack.
The X-Press design is inherently safe. In the event of an anchor failure, the bellows compress and actually
increase its strength. The end rings limit the extension of the expansion joint so that an anchor failure is
controlled and contained. The X-Press does not require maintenance, therefore, it can be installed in areas
where accessibility is limited. Lubrication and repacking are eliminated.
Normally located near an anchor, the single X-Press should be placed with the fixed end adjacent to the
anchor. The double X-Press is typically mounted in the middle of a long pipe run to absorb similar
movements from either direction. A support foot is uncluded with the double X-Press and acts as an
intermediate anchor.
PURGE and VENT CONNECTION located in
the top of the casing, allows the venting of
air or gases to assure a fluid-filled line. In
conjunction with a drain connection, the
vent can be used to flush the X-Press casing.
ANCHOR FOOT for single X-Press can be supplied
to withstand full pressure thrust and can be bolted
or welded in place. The double X-Press includes an
intermediate anchor foot.
DRAIN CONNECTION located in the bottom of the
casing for the removal of dirt, scale, sludge,
condensate and residue. This is an ideal location
for a steam trap when used for steam service.
A reprint of the paper “ Expansion Joints Vs Loops, an Economic Decision” by Robert K. Broyles, is available without charge on request.
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