TAC Pneumatic Products Catalog

Floor Mounted Damper Actuators
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 Chart
Model No.
MK-7821
Single
MK-7921
Dual
Diaph.
Area
(Total)
in. 2
(cm 2 )
20
(129)
40
(258)
4
(102)
135
(600)
270
(1201)
5
(127)
108
(480)
216
(961)
6
(152)
7
(178)
a Based on a 1.5 psig (10kPa) pressure change at the actuator.
b With 20 psig (138 kPa) main supply.
Stroke in. (mm) Max.
8
(203)
9
(229)
10
(254)
11
(279)
Lb (N) Force Available for Various Strokes b
90
(400)
180
(801)
77
(343)
154
(685)
68
(302)
136
(605)
60
(267)
120
(534)
54
(240)
109
(465)
49
(218)
98
(436)
12
(305)
45
(200)
90
(400)
13
(330)
42
(187)
84
(374)
MK-7821, MK-7921
MK-7921
Torque
b
Power
Stroke
lb-in.
(N-m)
315
(35.5)
630
(71.0)
Return
Stroke
lb-in.
(N-m)
360
(40.6)
720
(81.2)
Nominal
Torque for
Proportional
Control a
lb-in.
(N-m)
F-27383-1 © Copyright 2006 TAC. All Rights Reserved. 59
67.5
(7.6)
135
(15.2)
MK-782
MK-792