Azbil Corporation
Model: AMT, HDT - CV3000 Series Control Valves
27
(b) Reverse Action Type
(1) Fix the bottom diaphragm case and yoke with the bolts.
(2) Insert the actuator rod (to which the diaphragm is connected) into the
hushing, exercising care not to damage the bushing inside surface or dust
seal with the thread section of the rod. (For example, cover the threaded
section with adhesive tape to prevent damaging the bushing.)
(3) Make the stopper (in the diaphragm plate) in parallel with the yoke by
turning the rod.
(4) Install the springs on the spring plate. The quantities of springs are as
follows:
HA2 ....................4 springs
HA3, HA4 ........... 8 springs
Except particular models as follows:
HA2, 38 mm stroke,
80 - 240 kPa (0.8 - 2.4 kgf/cm
2
) ....... Total 8 springs (with double springs)
HA3, 50 mm stroke,
80 - 240 kpa (0.8 - 2.4 kgycm
2
) ........ Total 16 springs (with double springs)
HA4, 75 mm stroke,
80 - 240 kPa (0.8 - 2.4 kgf/cm
2
) ....... Total l6 springs (with double springs)
(5) Place the top diaphragm case and fix it with the pair of eyebolts. Set the air
vent hole in the location shown in the illustration (Fig. 4-17). Uniformly and
alternately tighten the eyebolts. The initial setting of the springs is complete
by tightening of these eyebolts.
Fig. 4-17 Reverse Action Type
(6) Clamp the diaphragm case with other clamping-bolts than the pair of
eyebolts.
(7) Install the pointer, secure the lock nut, and install the stem connector.
(8) Install the rain cap on the air vent port.
(9) Connect the air pipe to the air piping connection port of the bottom
diaphragm case.
(10) After the assembly is complete as above, check the following.
1. Applying an air pressure of 490kPa (5kgf/cm
2
) via the air Piping
connection port of the bottom 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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