Technical Data Sheet
TD_812
pneum. Multi-Spring-Actuator
Technical Data
Series 812
Diaphragm effective area 320 / 720 cm²
Stroke 20-60 mm
Control signal 6 bar max.
Diaphragm- and spring chamber: Steel ST W 22, 1.0332
(Optional: stainless steel 1.4301)
Diaphragm plate: St W 22 chromatized
Yoke: GGG-40, 0.7040
Materials
Spindle: 1.4122
Springs: 1.1230 plastic-covered
Diaphragm: NBR, fabric-reinforced (moulded)
Gasket: high-quality, special polyurethane
Spring chamber Optionally with air scavenging
Operating temperature -20 to +80°C (Option -40 to + 80°C)
No. of springs 6-12
Control force spring max. 6,3 - 14 kN
Control force air max. 14,4 - 32,4 kN
Functional description
The ARCAPAQ is a pneumatic multi-spring diaphragm actua- splash-proof
tor with spring return (fail safe) and is used to actuate linear protective cap
valves. The actuator positions the valve plug, which in turn is
controlled by a pneumatic or electropneumatic positioner. Actuator housing
These actuators can be operated in the "Air to open" function or
with the reverse action "Air to close". Spring
The actuator has a compact design with a low installed
height. Various spring sets with different ranges ensure Diaphragm
good adaptation to the relevant operating conditions.
A fabric-reinforced diaphragm ensures smooth conversion of Diaphragm plate
the pneumatic application of pressure into the linear motion
of the actuator spindle. The power diaphragm (4), supported
Slide bearing
by the diaphragm disc (5), is connected to the actuator spin-
dle (8) and separates the actuator housing (2) into pressure Special sealing
and spring chambers. If the force of the compressed air con- element
trol signal exceeds the opposing spring force (3), the actua-
tor spindle (8) moves and actuates the linear valve. Actuator spindle
The control signal is carried to the diaphragm chamber via
Stroke indicator
internal channels in the yoke (10). The air supply and vent-
ing (ventilation) of the spring chamber is carried out by
means of the protective cap (1), which is impermeable to Yoke
splash water, or the chamber is purged through internal
channels with the air from the positioner.
The yoke (10) connects the actuator to the control valve,
while the actuator spindle (8) is connected to the valve spin-
dle via the coupling shown as a stroke indicator (9), securely
guided in the slide bearing (6) and sealed with a special
sealing element (7) with wiper.
ARCA Regler GmbH Kempener Strasse 18 D-47918 Tönisvorst
Tel.: +49-(0)2156-7709-0 Fax: +49-(0)2156-7709-55 sale@arca-valve.com www.arca-valve.com
TD_812_gb_11-2011_Rev02.doc - Subject to technical modifications - Page 1 of 4
Technical Data Sheet
TD_812
pneum. Multi-Spring Actuator
Control forces and control ranges
Opening function (air to open - spring to close)
Diaphragm Control range Control see
No. of Stroke
Size surface Type force force
springs (mm) from (bar) to (bar
(cm²) (kN) diagram
3 0,75 1,5 2,4
MFI-20 812-21(2).. 20 I
6 1,5 3,0 4,8
320
3 0,75 1,5 2,4
MFI-30 812-23.. II
6 1,5 3,0 4,8
3 0,7 1,5 5
30
6 1,5 3,0 10
MFIII-30 812-33.. III
9 1,8 3,7 13
12 2,2 4,4 16
720
3 0,7 1,5 5
6 1,4 3,0 10
MFIII-60 812-34.. 60 IV
9 1,7 3,6 12
12 2,0 4,3 14
Closing function (air to close - spring to open)
Control Control force (kN)
Diaphragm
No. of Stroke pressure depending on control pressure
Size area Type
springs (mm) min. 2,0 3,0 4,0 5,0 6,0
(cm²)
bar bar bar bar bar bar
3 1,5 1,6 4,8 8,0 11,2 14,4
MFI-20 812-21(2).. 20
6 3,0 - - 3,2 6,4 9,6
320
3 1,5 1,6 4,8 8,0 11,2 14,4
MFI-30 812-23..
6 3,0 - - 3,2 6,4 9,6
3 1,5 3,6 10,8 18 25,2 32,4
30
6 3,0 - - 7,2 14,4 21,6
MFIII-30 812-33..
9 3,7 - - 2,2 9,4 16,6
12 4,4 - - - 4,3 11,5
720
3 1,5 3,6 10,8 18 25,2 32,4
6 3,0 - - 7,2 14,4 21,6
MFIII-60 812-34.. 60
9 3,6 - - 2,9 10,1 17,3
12 4,3 - - - 5,0 12,2
Force diagram
I MFI-20 II MFI-30 III MFIII-30 IV MFIII-60
ARCA Regler GmbH Kempener Strasse 18 D-47918 Tönisvorst
Tel.: +49-(0)2156-7709-0 Fax: +49-(0)2156-7709-55 sale@arca-valve.com www.arca-valve.com
TD_812_gb_11-2011_Rev02.doc - Subject to technical modifications - Page 2 of 4
Technical Data Sheet
TD_812
pneum. Multi-Spring Actuator
Dimensions and weights
M2=Thread of
particular valve spindle
Diaphragm M1
No of Stroke ØD Ød S A B H HV ØR
Size surf. Type Weight actua-
springs (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)
(cm²) tor
3
812-21.. 10 40
6
MFI-20 14 20 20 120 180 361 508 220
3
320 812-22.. 270 48
6
14
3
MFI-30 812-23.. 16 203 404 551 220
6
3
40 30 56 25 142
6
MFIII-30 812-33.. 20x1,5 251 489 651 335
9
42
12
720 400
3
45
6
MFIII-60 812-34.. 60 20x1,5 72 30 192 309 625 888 335
9
47
12
ARCA Regler GmbH Kempener Strasse 18 D-47918 Tönisvorst
Tel.: +49-(0)2156-7709-0 Fax: +49-(0)2156-7709-55 sale@arca-valve.com www.arca-valve.com
TD_812_gb_11-2011_Rev02.doc - Subject to technical modifications - Page 3 of 4
Technical Data Sheet
TD_812
pneum. Multi-Spring Actuator
Type code
812 -2 2 3 3 2- O B 0 -HV
Series
Actuator size
2 MFI diaphragm surface 320 cm²
3 MFIII diaphragm surface 720 cm²
Yoke (ø = adapter in mm)
0 1 2 3 4 5 6 9
w/o ø40 ø48 ø56 ø72 ø40-8C ø48-8C special
Hub
1 2 3 4 5 6
10 mm 15 mm 20 mm 30 mm 45 mm 60 mm
Spring set
3 = 3 springs 6 = 6 springs 9 = 9 springs 0 = 12 springs
Material of diaphragm chamber
2 = Steel StW22 3 = Stainless steel
Function
O = springs move the spindle downwards (air to open)
S = springs move the spindle upwards (air to close)
Execution
B or C or E
Extra equipment
0 1 2 3 4 5
None Stroke limitation Lifting eye 1+2 Low temperature design Air connection ½“
Handwheel
ARCA Regler GmbH Kempener Strasse 18 D-47918 Tönisvorst
Tel.: +49-(0)2156-7709-0 Fax: +49-(0)2156-7709-55 sale@arca-valve.com www.arca-valve.com
TD_812_gb_11-2011_Rev02.doc - Subject to technical modifications - Page 4 of 4
