Azbil Corporation
Model: AMT, HDT - CV3000 Series Control Valves
31
HDT Type (Diverting Type)
(a) Lift Adjustment
• For Valve with Direct-action Actuator
Keeping the stem connector disconnected, make air piping to apply an air pressure
to the diaphragm. Apply an air pressure to the actuator so that the actuator stem
(pointer) is pressed down by 2mm and, in this state, set the AB-A point of the scale
to the pointer. Next, increase the air pressure until the pointer indicates the AB-B
point on the scale. On the other hand, press down the valve stem until the valve plug
is seated on the upper seat ring. Now connect the actuator stem to the valve stem
with the stem connector.
By adjusting the air pressure applied to the diaphragm, check that the lift (stroke) is
normal.
Next, with the valve position at a midposition of the stroke, slightly loosen the screw
of the stem connector so that it can be rotated with your hand. By adjusting the air
pressure, let the valve plug seated on the upper and lower seat rings. The seated
state can be known as the stem cannot be rotated with your hand when in this state.
If the stem connector can be rotated with your hand, this means that the valve plug is
not seated on the seat. If this is the case, repeat the adjustment all over again.
• For Valve with Reverse-action Actuator
Keeping the stem connector disconnected, make air piping to apply an air pressure
to the diaphragm. Apply an air pressure to the actuator so that the actuator stem
(pointer) is pressed down by 2mm and, in this state, set the AB-B point of the scale
to the pointer. On the other hand, press down the valve stem until the valve plug is
seated on the upper seat ring. Now connect the actuator stem to the valve stem with
the stem connector.
By adjusting the air pressure applied to the diaphragm, check that the lift (stroke) is
normal.
Next, with the valve position at a midposition of the stroke, slightly loosen the screw
of the stem connector so that it can be rotated with your hand. By adjusting the air
pressure, let the valve plug seated on the upper and lower seat rings. The seated
state can be known as the stem cannot be rotated with your hand when in this state.
If the stem connector can be rotated with your hand, this means that the valve plug is
not seated on the seat. If this is the case, repeat the adjustment all over again.
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