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Field Service Guide |
New Page 2
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Contents |
| Features - Gorman
Pressure Balance Packing |
| Pressure balance packing is
designed for elevator jacks and has these features. It is a non-adjustable
floating type seal, allowing the cap bolts to be tightly in place. The
internal ribs are molded diagonally to provide internal spring-action for
positive sealing from zero pressure to 1500 psi.
A single seal is all that is required to
provide oil retention. However, when gland clearance is too great, a backup
ring is provided to prevent seal extrusion. Some packing boxes are provided
with an oil return line arrangement that will require two seals and a spacer
(or lantern ring).
Packing friction can affect the operation of
the control valve and should be corrected before adjusting the valve. Both a
rough upstart and/or a bumpy down-start are an indication of excessive
friction. Gorman pressure-balance seals, including GCI wiper and correct
installation procedures, will normally correct friction and/or leaking
problems. |
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© 2003 - 2004
Gorman Co., Inc. All rights reserved. All photos and copy are the sole
property of Gorman Co., Inc. |
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