Azbil VDD Series, User Manual

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Azbil Corporation
3
Chapter 2: Installation
~CAUTION
The inner surfaces of certain models of control valves are lined with glass, hard
rubber, or other material which is not highly resistant to mechanical shock. Exercise
care when handling these models.
2.1 Maximum Weight for Hoisting with Eyebolts
In principle, use the eyebolts* attached to the diaphragm case for mounting or
removing the actuator only. When hoisting the valve body or accessories along with
the actuator using the eyebolts, observe the maximum total weight shown below.
Table 2-1
Actuator model Maximum weight (kg) Product weight (kg)
PSA1 160 11-15
HA2 160 20-35
HA3 160 40-60
HA4 220 90-100
* A pair of bolts with a ring-shaped head that tighten the diaphragm case.
Note: The eyebolts included with the weir diaphragm control valve can be used to
hoist the entire control valve. However, be extremely careful that no mechanical
shock is applied to the control valve.
2.2 Installation on the Piping
(1) Before installing the valve on the piping, remove foreign matter (scale, welding
spatter, etc.) from both upstream and downstream sides of the pipe.
(2) Make sure that the gaskets do not protrude into the flow path and constrict the
inner diameter of the valve.
Be sure to use gaskets made of a material that is suitable for the process fluid.
(3) Make sure that no excessive stress is conveyed from the process pipe to the
valve body. Tighten the bolts for flange connection evenly.
(4) Install the flange gaskets correctly, not slanted or off-center. Otherwise,
damage on the valve body or poor seal of the gaskets may result.
(5) Before connecting the air pipes to the actuator and positioner, blow air through
the pipes to remove dust and foreign matter.
(6) Do not keep the bonnet in damp or cold conditions.
(7) Do not drop the valve or subject it to impact.
(8) To change the orientation of the actuator, follow the procedure described
in steps 1 and 2 in section 4-1, loosen the nuts that hold the yoke, rotate the
actuator to the desired orientation, tighten the yoke nuts again, and then follow
the procedure in steps 2–6 in section 4-4.