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Grinnell Hydraulic Shock
& Sway Suppressors
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Grinnell
Hydraulic
Shock & Sway Suppressors
STANDARD SETTINGS: The
standard settings are: Locking (Activation) Velocity 8 -2
in/min.
Bleed Rate (Post Activation)
at Normal Rated Load 4 1 in/min.
The valves are calibrated at the
factory within the tolerances indicated at room
temperature. Locking velocity and bleed rate will vary
with temperature. Testing has indicated that there is
little effect of these changes on dynamic operation.
FEATURES:
• Factory Calibrated Valves
• Rapid, Positive Valve Closure
- Special Design Minimizes the "lost
motion" which results from the shifting and
seating of piston seals
• Unlocked resisting force is less than 1% of
rated load
- Ethylene - Propylene Seals
- Stable, non-flammable, long life hydraulic fluid
made highly visible for ease of inspection
• Seals and fluid have been
radiated to a cumulative gama dose of 3 x 101 rad
without impairment of operability
- Self-aligning bushings permit
+/- 5* misalignment or angular motion. Bushings are
coated with a dry lubricant.
• Continuous operation at 200*F with brief
transients to 300*F
HOW TO SIZE:
1 . Bore Size:
Use table on this page to select
bore size large enough to restrain expected load.
2. Stroke:
Define expected movement of the pivot joining the
suppressor with the equipment to be protected (cold
to hot plus any abnormal movements). Determine
maximum and minimum distances between this curve and
the fixed pivot pin of the suppressor. The minimum
required stroke is 20% greater than the difference
between these lengths. NOTE: If erected position at
the suppressor's location on the equipment is outside
of the range of normal cold-to-hot movement (e.g.
cold pull of pipe), the suppressor should not be
installed until after the equipment is in its cold
position. This eliminates the need of providing for
the extra travel in the suppressor's stroke. For 21/2
inch through 8 inch suppressors, standard strokes are
5, 10, 15, and 20 inches. For the 1112 inch
suppressor, 5 and 10 inches are the only standard
strokes.
Installed Piston Setting:
As indicated previously, the suppressor should be
installed at its cold piston position if possible.
From the installed position, take extension (outward
movement) of the piston rod as positive (+) and
retraction as negative ( -). Installed Piston
Position =
Stroke - (Algebraic Sum of Movements)
2
To aid in measuring
the piston position, we have shown a dimension,
"Z". This dimension represents the distance
between the cylinder head and the end of the rod when
the rod is fully retracted. Whenever specifying the
position at which the piston rod is to be set, the
total dimension from the cylinder head to the end of
the rod should be given. Thus, Piston Setting= Piston
Position + Z.
Assembly Length:
Determine the installed "C" dimension by
adding the installed piston position (not setting) to
C minimum. Lay in takeout dimensions E and/or A, and
find required pin-to-pin suppressor length.
If a pin-to-pin length adjustment is desired, use
Fig. 201. Calculate the required "W"
dimension by subtracting (C installed + F) from the
required pin-to-pin length. If this is less than W
minimum, only a Fig. 200 can be used; and one of the
attachments will have to be moved or shimmed to suit.
If a Fig. 200 is to be used, make sure that the
required pin-to-pin length is at least as great as (C
installed + B). If neither a Fig. 200 nor a Fig. 201
can be accommodated, and the installation cannot be
modified, consult your Grinnell representative about
designing a special or modified unit.
ORDERING: Specify figure
number, name, cylinder bore size, stroke, load, cold and
hot piston settings, and option number if other than
standard rod end configuration is required. If pipe clamp
is to be provided, specify nominal pipe size or special
O.D. and clamp material (chromemoly or carbon steel).
Describe any additional optional feature or special
settings required. Include the "W" dimension
when specifying a Fig. 201. Alloy pipe clamps are
available as a special order. The rear bracket assembly
may be ordered separately.
For restraint parallell to the pipe
axis using two supressors, a riser clamp is available. If
a riser clamp is required, consult the nearest Grinnell
representative for information about this clamp.
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