4-21
Assembly procedure
Before assembly, check the parts for scrapes, damage, deformation, peeling off of paint, and
other abnormality. To assemble the actuator, proceed as followes:
(a) Direct action type
(1) Fix the bottom diaphragm case and yoke with the bolts. (For models HA2D and HA3D,
install the diaphragm case and spring plate together.)
(2) Install the springs on the spring plate. The quantities of springs are as follwes;
Model HA2.....................4 springs
Model HA3, HA4........... 8 springs
Except particular models as follows:
Model HA2, 38 mm stroke,
80 - 240 kPa (0.8 - 2.4 kgf/cm
2
).......Total 8 springs (with double springs)
Model HA3, 50 mm stroke,
80 - 240 kpa (0.8 - 2.4 kgf/cm
2
)....... Total 16 springs (with double springs)
Model HA4, 75 mm stroke,
80 - 240 kPa (0.8 - 2.4 kgf/cm
2
)...... Total l6 springs (with double springs)
(3) Insert the actuator rod (to which the diaphragm is connected) into the bushing, exercising
are not to damage the bushing inside surface or dust seal with the threaded section of the
rod. (For example, cover the threaded section with adhesive tape to prevent damaging the
hushing.) Set the stopper in parallel with the yoke.
(4) Place the top diaphragm case and fix it with the pair of eyebolts.
Notes: • Set the air piping connection port in the location shown in the illustration.
(Figure 4-18)
• Tighten the pair of eyebolts uniformly by tightening them alternately. The
initial setting of the springs is complete by tightening of these eyebolts.
Figure 4-18 Direct Action Type
(5) Clamp the diaphragm case with other clamping-bolts than the pair of eyebolts.
(6) Install the pointer, secure the lock nut, and install the stem connector. (Connect the air
pipe to the air piping connection port of the top diaphragm case.)
(7) After the assembly is complete as above, check the following.
1. Applying an air pressure of 490 kPa (5kgf/cm
2
) via the air piping connection port of
the top diaphragm case, check the diaphragm periphery for air leak by using soapsuds.
2. Check that the actuator smoothly operates for its full stroke.
Note: Check this operation by operating the actuator as an independent unit.
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