80-4280-10, Rev. 4
13
LINK-ASSIST™ REPORT
Contact your Beck sales engineer to obtain
a Beck Link-Assist™ report specific to your
application. When you provide your application’s
horizontal and vertical shaft offset dimensions,
the damper lever arm radius, the damper lever
arm start angle, and total damper lever arm travel
Beck can provide the appropriate linkage length,
Beck crank arm radius, and Beck crank arm
start angle. For additional information regarding
linkage requirements and to obtain a sample Link-
Assist report, please visit the Beck website at the
following address and navigate to the Link-Assist
Services:
http://www.haroldbeck.com/
The terminology mentioned above is shown in
the linkage definitions diagram on page 19.
LINKAGE KITS AVAILABLE
Standard Beck linkage kits are made to
accommodate a wide variation in linkage lengths
without requiring modification of end fittings. This
adaptability makes it possible to order, with the
drive, the essential linkage end connections even
though the exact linkage length may not be known
until the actuator is mounted in place.
Each linkage kit includes the pipe linkage end
connections (couplings), studs, lock nuts, and a
rod end. Schedule 40 pipe is not included and
must be cut to length and threaded in the field (see
Table 1, this page, for instructions to calculate pipe
length).
To simplify installation of the pipe link,
the kit accepts NPT right-hand threads on both
ends of the pipe. Left-hand threads are internal
to the linkage kit assembly, making final length
adjustments quick and easy.
To order pipe linkage kits, first obtain the
approximate overall linkage length “A” in the
illustration below. Select the kit part number from
Table 1, below. For lengths beyond those listed in
the table, contact your Beck Sales Engineer.
LINKAGE KIT DETAIL
* NOTE: To calculate the length of pipe required,
subtract the length of 2 linkage ends (shown in
Table 1) from the linkage length “A”.
TABLE 1 - PIPE LINKAGE KITS
Linkage Length “A”
Pipe Size
Minimum
Pipe Nipple
Length
Rod End
Thread
(UNF)
Linkage Kit
Part No.
Length of 2
Linkage Ends
(+/- 1.5" (38 mm))
Approximate
Weight*
23.5”-40” (597-1 016 mm)
2” (51 mm)
2” (51 mm)
1-1/2”-12
20-1760-13
21.5” (546 mm)
28 lbs (13 kg)
37.75”-144” (959-3 658 mm)
3” (76 mm)
2.63” (67 mm) 1-1/2”-12
20-1760-10
35.13” (892 mm)
32 lbs (15 kg)
59.75”-144” (1 518-3 658 mm) 3” (76 mm)
2.63” (67 mm) 1-1/2”-12
20-1760-09**
57.13” (1 451 mm)
41 lbs (19 kg)
Note: To calculate length of pipe required, subtract “Length of 2 Linkage Ends” from Linkage Length “A” (shown in diagram above).
* Does not include customer supplied pipe.
** Use when the angle between the linkage and the crank arm is less than 25°.
