Azbil HLS Series User Manual

10-2
10-3. Installation into the gland
10-3-1. Preparation for installation
1. Checking for the surface conditions of parts
If there is any flaw or the like on the surface of a part, the total amount of gland leakage may
exceed a specified value because of fluid leakage from the periphery. For this reason, check the
surface conditions of the following parts:
Table 10-1. Parts whose surface conditions need to be checked
Part name FInding: Assumption
Stem
• No flaws or defects,
including scratches and
dents
• No rust or corrosion
• The finished surface should
be uniform over its entire
area.
• No burrs
• Clean, without adhesion
of any coating material,
powdery material, or dirt
• When necessary, measures
should be taken, such as
cleaning with alcohol.
The total amount of gland
leakage may exceed the
specified value because of fluid
leakage from the periphery of a
flaw .
Stuffing box
Both ends of the spacer
Packing follower
Packing contact surface
O-ring groove
Packing flange
Gland nut contact surface
The amount of gland leakage
may exceed the specified value
because of insufficient
tightening.
Packing flange
Entire surface Gland stud
Gland nut
• No flaws, rust, or defects.
Damage to the control valve
may be caused, and may lead
to physical injury.
2. Preparation of new parts
Be sure to prepare new parts at the time of the first installation or reinstallation of the
following parts.
Table 10-2. Parts that need to be renewed
Part name Finding Assumption
Gland packing
No flaws, coating materials, or
dirt on the surface
The amount of leakage may
exceed the specified value
because of fluid leakage from
the periphery of a flaw or the
like.
Belleville spring
The amount of gland leakage
may exceed the specified value
in a short period of time
because of overtightening or
insufficient tightening.

Azbil HLS Series Specifications

General

Brand	Azbil
Model	HLS Series
Category	Control Unit
Language	English