Azbil Corporation
Model: AMT, HDT - CV3000 Series Control Valves
51
9. Mechanical stopper
Refer to “Fig.9-1” on page 52 for details of construction. This device can be used
as MIN. stopper or MAX. stopper as required. Also, it can be used as MIN/MAX
stopper.
The MIN. stopper (limits valve’s minimum opening for direct acting valve) regulates
the maximum suction of stopper shaft, and the MAX stopper (limits valve’s
maximum opening of valve opening for direct acting valve) regulates maximum
extrusion of stopper shaft 4.
9.1 Adjustment of MIN. stopper
(1) Loosen detent 2 and remove MAX. stopper 1 (adjust cover) from housing 5.
(2) Loosen hexnut 3 for MIN. stopper and remove from stopper shaft 4. Although
the stopper does not function in this condition, the valve can operate across the
rated range of lift.
(3) Manipulate positioner signal, supply air pressure or manual handle to set the
valve at the stopper’s set position.
(4) Lock the detent at the position when it hits housing 5 while the valve is set.
(5) Assemble and lock MAX. stopper and detent 2 at the position where they do not
hit the maximum protruding position of stopper shaft 4.
9.2 Adjustment of MAX. stopper
(1) Loosen detent 2 and remove MAX. stopper 1 (adjust cover) from housing 5.
(2) Loosen hexnut 3 for MIN. stopper and remove from stopper shaft 4. Although
the stopper does not function in this condition, the valve can operate across the
rated range of lift.
(3) Manipulate positioner signal, supply air pressure or manual handle to set the
valve at fully open position.
(4) Screw on hex head nut for MIN. stopper 3 onto stopper shaft 4. The hexnut for
MIN. stopper 3 should be locked at the top end of the stopper shaft 4 to make
the distance between the lower face of the hexnut 3 and housing 5 larger than the
rated lift.
(5) Manipulate positioner signal, supply air pressure or manual handle to set hte
valve at the stopper’s set position.
(6) Screw MAX. stopper 1 onto housing 5, and when MAX. stopper 1 seats against
hexnut for MIN. stopper 3 or stopper shaft 4, lock MAX. stopper 1 with detent 2.
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