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English
Danger Analysis
WARNING: General safety regulations must be observed
unconditionally during repair. Qualified personnel must always be
present when installation, maintenance and repair are carried out.
Fault diagnosis
Effect
Cracks, holes,
Leakage, flying
damage, leakage
shrapnel, danger of
poisoning, burns
danger, corrosive
fluid danger,
environmental
pollution
Broken threads
Hot surface
Danger of burns
Insulated valve or
install protective
device
Causes and remedies when malfunction occurs
When experiencing malfunction please check that the installation instruction and
adjustments were carried out in accordance with these instructions.
Information about material, temperature and flow direction are to be verified.
The conditions of usage must also correspond to these instructions, the data sheet
and the technical information given on the ID brass tag.
Troubleshooting
Fault diagnosis
Effects
No flow
Valve closed
Valve not sufficiently open
Dirty filters
Blocked pipes
Incorrect valve / Kvs
coefficient selected
Valve ball stuck
The valve ball is jammed in
the seat due to deposit or
solid particles in the fluid
Leakage at stem
Stem seal leaking
Internal leakage is
Seat and plug leaking
too high when
valve is closed
Excessive noise
Seat and plug dirty
Fluid flow noises or cavitation
Cause
Remedial action /
Minimizing risk
Piping stressed
Reduce pressure
beyond permitted
and stress, change
limits, recoil forces,
piping position,
pressure surges,
install
valve used as fixing
compensators,
point, permitted
select other
pressure and
materials, replace
temperature limits
valve
not observed
Improper transport,
Replace valve,
bending stress too
ensure that piping
great, thermal
is laid free of stress
stress
or tension
Valve without
Insulated valve or
insulating, carrying
install protective
hot fluid, too
device
reached
accidentally
Remedial action /
Minimizing risk
Open valve (using actuator)
Open valve (using actuators)
Clean / replace filters
(only when system is free off
pressure!)
Check piping system
Replace valve with one of
greater Kvs coefficient
Demount actuator and move
repeatedly the valve stem by
the means of a wrench.
If problem still occurs, replace
valve
Replace valve
Replace valve
Demount actuator and move
repeatedly the valve stem by
the means of a wrench.
If problem still occurs, replace
valve
Reduce differential pressure
or mount valve with higher
Kvs
IS_VG1000 Series_14-88356-57_Rev. F_09 2010
Table 1: Kvs values and Close Off pressures
Kvs Control Port /
Size
Kvs Bypass Port*
1.0/0.63
1.6/1.0
2.5/1.6
15
4.0/2.5
6.3/4.0
10/5.0
4.0/2.5
20
6.3/4.0
10/5.0
6.3/4.0
25
10/5.0
16/8.0
10/5.0
32
16/8.0
25/12.5
16/8.0
40
25/12.5
40/20
25/12.5
50
40/20
63/31.5
* for 3-way valves only
This document is subject to change without notice
Closeoff
Flow Disk
Item Codes
KPa
Yes
VG1x05AD
VG1x05AE
VG1x05AF
VG1x05AG
VG1x05AL
No
VG1x05AN
Yes
VG1x05BG
VG1x05BL
No
VG1x05BN
Yes
VG1x05CL
1380
VG1x05CN
No
VG1x05CP
Yes
VG1x05DN
VG1x05DP
No
VG1x05DR
Yes
VG1x05EP
VG1x05ER
No
VG1x05ES
Yes
VG1x05FR
VG1x05FS
No
VG1x05FT
2
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