Page 6 - GarlockFluidSealing2010

A-4
Excellent sealing Our best available
sealing technology for emissions compliance
¦Patented cup and cone design permits selective
component compression and controlled radial fow
for effective sealing on I.D. and O.D.
¦ End rings act as wiper rings to restrict graphite
particle transfer, prevent extrusion and provide extra
resiliency
Custom design capability
¦ Patented cup and cone design provides sealability
in valves as shallow as three ring cross sections
¦ For deep stuffng boxes requiring more than a 7-ring
set, machined / split carbon bushings can shorten
the box depth
• Grade 250 (Style #4525) for general services
• Grade 580 (Style #4540) for nuclear services
¦ Available in commercial and nuclear grades
¦ Consult Garlock Applications Engineering with
details of your application.
¦ Fire Safe
Specifcations
Construction: GRAPH-LOCK® rings of high-purity
diamond texturized graphite tape,
in cup and cone confguration; end
rings made from Garlock Style 98
Temperature: -328°F (-200°C) to +850°F (+455°C)
atmosphere; to +1,200°F (+650°C)
steam
pH Range: 0-14 (except strong oxidizers)
Pressure: To 10,000 psi plus (690 bar)
* Patent #4,328,974
Live loading
Live loading can provide gland load retention for
in-service consolidation of the packing. A set of disc-
spring washers placed on each gland stud bolt between
the gland fange and gland bolt nut helps exert a con-
tinuous compressive force on the gland follower fange
and, therefore, on the packing set.
Live loading is recommended where any one of
these fve criteria is present:
¦ 5,000 or more complete valve stem actuations are
anticipated before the next scheduled repacking, or
the valve stem is in a state of constant modulation
¦ Standard installation procedures cannot be followed
¦ The valve is critical to the operation of the process
¦ Multiple thermal cycling of the valve is anticipated
due to the process system
¦ The valve is inaccessible for future adjustment
Our live loading program is specifcally designed
to compensate for the reduced in-service consolidation
needs of today’s asbestos-free graphite or carbon-
based packing sets. It consists of even numbers of
opposing disc-spring washers sandwiched between
standard fat washers.
Valve Stem
Live Loaded
Adjustment Bolt
High Density
GRAPH-LOCK ®
Low Density
GRAPH-LOCK®
High Density
GRAPH-LOCK®
Braided
End Rings
Bushing
Carbon
Bushing
Die-Formed
Cup & Cone
Packing Set
Live Load
Spring
Stack
9000 EVSP* Simplifed