Instruction Manual
TM
D103590X012
January 2015 - Rev. 00
Type PS/79-1 and PS/79-2
Type PS/79-1 and PS/79-2 Pilots
SUMMARY
Introduction ........................................................................ 1
Characteristics .................................................................... 1
Labelling ............................................................................. 2
Dimensions and Weight ...................................................... 2
Installation .......................................................................... 2
Startup ................................................................................ 2
Periodic Checks.................................................................. 2
SEP Statement .................................................................. 2
ATEX Requirements .......................................................... 2
Maintenance ....................................................................... 3
Troubleshooting .................................................................. 4
Parts Lists ........................................................................... 5
Schematic Assemblies........................................................ 6
INTRODUCTION
Scope of Manual
This manual provides installation, startup, maintenance,
troubleshooting, and spare parts for the pilot series PS/79-1
and PS/79-2.
Product Description
Designed for pressure regulators control, the following types
are available:
• PS/79-1 - RE/79-1 - PSO/79-1 - REOPS/79-1
• PS/79-2 - RE/79-2 - PSO/79-2 - REO/79-2
Tightness cover version available on request
(e.g. Types PS/79-1-D and PS/79-2-D).
The full range of PS pilots can be installed in the following
pressure regulators:
FL Series - Cronos Series
Figure 1. Type PS/79-1 or PS/79-2 Pilots
This product has been designed to be used with fuel gases of
1st and 2nd family according to EN 437, and with other non
aggressive and non fuel gases. For any other gases, other
than natural gas, please contact your local sales agent.
CHARACTERISTICS
Table 1. Technical Features
APPLICATION
Regulator or
Monitor
PS/79-1
PS/79-2 0.5 - 3
1/4-inch NPT female threaded connections.
All PS/ series pilots are supplied with a lter (5μ ltering degree)
and built-in pressure stabilizer, with the exception of Type
PSO/79-1 and PSO/79-2 pilots (supplied without stabilizer).
ALLOWABLE
PRESSURE PS
(bar)
25
SET RANGE W
(bar)
0.01 - 0.5
d
BODY AND
COVERS
MATERIAL
Aluminum
Type PS/79-1 and PS/79-2
=x
LABELLING
BOLOGNAITALY
O.M.T.
MATRICOLA
SERIALNr.
ANNO
YEAR
NORMEARMONIZ.
HARMONIZED STD.
CLASSEDI PERDITA
LEAKAGECLASS
CLASSEFUNZIONALE
FUNCTIONALCLASS
FLUIDO GRUPPO
FLUIDGROUP
TS
Note 2
EN
Cg
pmax
1
PS
°C
body
Figure 2. Label for PS/79-1 and PS/79-2 Pilots
Note 1: See “Characteristics”
Note 2: Year of Manufacture
Note 3: Class 1: -10° to 60°C
Class 2: -20° to 60°C
Note 4: See “Characteristics”
APPARECCHIO TIPO /DEVICE TYPE
DN1
DN2
Wa
Wao
Wau
bar
PS
bar
covers
DIMENSIONS AND WEIGHT
145
Note 1
pao
bar PT
-
INSTALLATION
a. Check that data on the pilot’s plate are compatible with
actual working conditions.
b. Install in accordance with regulator instruction manual.
bar
bar
bar
bar
PS bar
1.5Note 4Note 3
STARTUP
See the set-up and pilot adjustment instructions applying to
the equipment where the pilot is tted.
PERIODIC CHECKS
Slowly close the outlet slam-shut and check line pressure
between it and regulator. A slight increase in pressure should
be detected: this results from overload due to closing, and
is followed by pressure stabilization. If, however, outlet
pressure continues to rise, then seal is defective. Check if
leak is coming from regulator or pilot, and service.
SEP STATEMENT
270
Emerson Process declares this product conforms to
Pressure Equipment Directive (PED) 97/23/EC.
Article 3 section 3 and was designed and manufactured in
accordance with sound engineering practice (SEP).
Per Article 3 section 3, this “SEP” product must not bear the
CE marking.
ATEX REQUIREMENTS
WARNING
!
If the provisions of EN 12186 & EN 12279,
nationalregulations,ifany,andspecic
manufacturer recommendations are not
put into practice before installation and
if purge by inert gas is not carried out
before equipment’s start-up and shut-down
operations, a potential external and internal
explosive atmosphere can be present in
equipment & gas pressure regulating/
measuring stations/installations.
TYPE PS/79-1 AND PS/79-2 FULL RANGE WEIGHT: 2.5 kg
Figure 3. Type PS/79-1 and PS/79-2 Pilots Dimensions (mm)
2
If a presence of foreign material in the pipelines is foreseen
and purge by inert gas is not carried out, the following
procedure is recommended to avoid any possible external
ignition source inside the equipment due to mechanical
generated sparks:
Type PS/79-1 and PS/79-2
• drainage to safe area via drain lines of foreign materials, if
any, by inow of fuel gas with low velocity in the pipe-work
(5m/sec)
In any case,
• provisions of Directive 1999/92/EC and 89/655/EC shall
be enforced by gas pressure regulating/measuring station/
installation’s end user
• with a view to preventing and providing protection against
explosions, technical and/or organizational measures
appropriate to the nature of the operation shall be taken
(e.g. : lling/exhausting of fuel gas of internal volume
of the isolated part/entire installation with vent lines
to safe area - 7.5.2 of EN 12186 & 7.4 of EN 12279 ;
monitoring of settings with further exhaust of fuel gas to
safe area ; connection of isolated part/entire installation to
downstream pipeline; ….)
• provision in 9.3 of EN 12186 & 12279 shall be enforced
by pressure regulating/measuring station/installation’s end
user
• external tightness test shall be carried out after each
reassembly at installation site using testing pressure in
accordance with national rules
c. Unscrew seat (key 44) and replace pad holder (key 45).
d. Reassemble by reversing the above sequence.
Replacing Valve Seal Pads
e. Remove plug (key 23) and seat (key 25). Slide out spring
(key 27), pad holder unit (key 29) and forked stem (key 31).
f. Replace pad holder (key 29) and O-ring (key 32).
g. Reassemble by reversing above sequence.
General Maintenance
h. Proceed as directed in the replacement of lter, stabilizer
diaphragm and seal pad, and valve seal pads.
i. Completely release spring (key 5) by turning the adjusting
screw (key 1) counterclockwise.
j. Remove screws (key 10) and cover (key 6).
k. Keep plate (key 8) blocked with a box wrench, unscrew nut
(key 7).
• periodical check/maintenance for surveillance shall be
carried out complying with national regulations, if any, and
specic manufacturer recommendations.
MAINTENANCE
CAUTION
Servicingshouldbecarriedoutbyqualied,
skilled personnel only.
For further information, please contact our
Technical Support Representatives or our
authorized dealers.
Before servicing, cut off regulator inlet and outlet and release
any trapped pressurized gas. Use suds to check that there
are no leaks.
Replacing Filter
a. Remove screws (key 54), cover (key 58), and replace felt
(key 41). Reassemble by reversing the above sequence.
Replacing Stabilizer Diaphragm and Seal Pad
b. Remove screws (key 54), cover (key 55), spring (key 52)
and diaphragm assembly (key 53, 51, 50, 49, 48, and 47).
Replace diaphragm if necessary.
CAUTION
This must be done exactly as described to
prevent damage to or breaking of drilled
needle valve (key 17).
l. Unscrew plate (key 8) from stem (key 12) and slide off split
pin (key 35).
m. In Types RE/79-1 and -2, remove locknut (key 15) by
means of an appropriate wrench and slide out parts
(key 62, 63, 16, and 17), make sure that the surface of
seat (key 61) is intact.
n. Replace any worn seals.
Reassembly
Lubricate the static O-rings with a thin layer of Molykote
55 M, be very careful not to damage the O-rings when
reassembling. No other pilot parts are to be lubricated.
Reassemble parts by reversing the above steps. As you
proceed, make sure that parts move freely and without
friction.
In addition:
o. Once lever (key 36) and stem (key 12) have been
mounted, check that, with stem (key 12) against body
(key 19), clearance between forked stem (key 31) and
register (A) of lever (key 36) is 0.2 to 0.3 mm If not, use
register to correct.
3
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