Brochure

MK-7821, MK-7921
Floor Mounted Damper Actuators
Model Chart
For proportional pneumatic actuator used to
control inlet vanes on small and medium size fans
or large jackshafted dampers.
Features:
• Dual actuators, operating a single shaft and piloted by a
position, provide maximum capacity for heavy loads.
• Lever with multiple holes facilitates stroke adjustment to
suit various applications.
• Rigid steel base provides firm actuator support.
Model No.
Diaph.
Area
(Total)
in.
2
(cm
2
)
Stroke in. (mm) Max.
Torque
b
Power
Stroke
lb-in.
(N-m)
Return
Stroke
lb-in.
(N-m)
Nominal
Torque for
Proportional
Control
a
lb-in.
(N-m)
a
Based on a 1.5 psig (10kPa) pressure change at the actuator.
4
(102)
5
(127)
6
(152)
7
(178)
8
(203)
9
(229)
10
(254)
11
(279)
12
(305)
13
(330)
Lb (N) Force Available for Various Strokes
b
b
With 20 psig (138 kPa) main supply.
MK-7821
Single
20
(129)
135
(600)
108
(480)
90
(400)
77
(343)
68
(302)
60
(267)
54
(240)
49
(218)
45
(200)
42
(187)
315
(35.5)
360
(40.6)
67.5
(7.6)
MK-7921
Dual
40
(258)
270
(1201)
216
(961)
180
(801)
154
(685)
136
(605)
120
(534)
109
(465)
98
(436)
90
(400)
84
(374)
630
(71.0)
720
(81.2)
135
(15.2)
MK
-
782
MK-79
2
MK-7921
F-27383-1 © Copyright 2006 TAC. All Rights Reserved. 59