2
20 - 55 20 - 55 20 - 90 20 - 90
YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
TABLE 1 - FUNCTIONAL SPECIFICATIONS
Type 20 - 55 (see fig. 1) 20 - 90 (see fig. 3)
Type Direct acting Direct acting
Action Stem extends with air pressure Stem extends with air pressure
Diaphragm 950 cm
2
950 cm
2
Air displacement 5225 cm
3
8550 cm
3
Max. thrust 11 kN (48.800 lbf) 10 kN (44.400 lbf)
Spring range 1.0 to 3.8 bar (15 to 55 psi) 1.0 to 2.2 bar (15 to 32 psi)
Travel 55 mm (2⅛”) 90 mm (3½”)
Travel speed Depending on spring range, air supply
pressure, piping arrangement and air
capacity of auxiliary devices
Depending on spring range, air supply
pressure, piping arrangement and air
capacity of auxiliary devices
Travel indicator Integrated pointer and stainless steel
travel scale
Integrated pointer and stainless steel
travel scale
Air connection ½” NPT female ½” NPT female
Air supply 6.0 bar (max. 87 psi) 6.0 bar (max. 87 psi)
Ambient temperature
(std)*
-29°C to +70°C (-20°F to +158°F) -29°C to +70°C (-20°F to +158°F)
Weight 46.0 kg (102 lbs) 68.0 kg (150 lbs)
Handwheel Side mounted (see fig. 2) Side mounted (see fig. 4)
Weight 19.0 kg (42 lbs) 19.0 kg (42 lbs)
Protection level (std)** IP55 IP 55
FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4
NOTE
* = Optional temperature: -40°C to +80°C [-40°F to +158°F]
** = Optional protection level: IP66
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