Emerson Tartarini PRX Series User manual

PRX Series
Instruction Manual
D103591X012
January 2016 - Rev. 00
TM
SUMMARY
Introduction......................................................................... 1
Characteristics.................................................................... 1
Labelling ............................................................................. 2
Dimensions and Weights.................................................... 2
Installation .......................................................................... 2
Startup................................................................................ 2
Adjustment ......................................................................... 2
Periodic Checks.................................................................. 2
SEP Statement .................................................................. 3
ATEX Requirements .......................................................... 3
Maintenance....................................................................... 3
Spare Parts ........................................................................ 4
Parts Lists........................................................................... 5
Schematic Assemblies........................................................ 6
INTRODUCTION
Scope of Manual
This manual provides installation, startup, maintenance and
spare parts for the pilot PRX series.
Product Description
Designed for pressure regulators and slam-shut valves
control, the following types are available:
• PRX/120, PRX-AP/120
To control regulator or monitor
• PRX/125, PRX-AP/125
To control operating monitor
• PRX/181-PN, PRX/182-PN,
PRXAP/181-PN, PRXAP/182-PN
To control OS/80X-PN slam-shut device
• PRX/131, PRX-AP/131
Booster valve
• PRX/182, PRX-AP/182
To control VSFL relief valve
The full range of PRX pilots can be installed in the
following equipment:
FL Series - Cronos Series - EZH Series - 971 Model
BM5 Series - BM6X Series
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
MODEL
ALLOWABLE
PRESSURE
PS (bar)
SET RANGE
Wd(bar)
BODY AND
COVERS
MATERIAL
PRX/120, PRX/125
100
1 – 40
Steel
PRX-AP/120, PRX-AP/125 30 – 80
PRX/181-PN, PRX/182-PN,
PRX/131, PRX/182, 0.5 – 40
PRX-AP/181-PN, PRX-AP/182-PN,
PRX-AP/131, PRX-AP/182, 30 – 80
1/4-inch NPT female threaded connections.
The Type SA/2 stabilizer lter must be used with PRX series
pilots, for further informations please see the Instruction
Manual D103653X012.
PRX/ and PRX-AP/ Pilots
Figure 1. Type PRX/120 and PRX-AP/120 Pilots

2
PRX Series
LABELLING
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”
INSTALLATION
a. Make sure that specications on the pilot plate comply
with the intended use.
b. Make sure that all connections are correctly made.
STARTUP
Refer to the regulator or slam-shut valve startup instructions.
ADJUSTMENT
Only for PRX/120, PRX/125, PRX-AP/120
and PRX-AP/125 Pilots:
Adjusting response stability and rapidity is achieved by
means of the appropriate adjusting screws, R (restrictor) and
D (damper).
The register D is normally completely unscrewed; by
screwing the register, the response of the regulator can be
slowed down.
The register R is normally completely screwed; in case of
hunting of the set pressure, we suggest unscrewing slowly
the register until pressure steadiness is reached.
By unscrewing the register, the set pressure decreases;
intervene on register screw (key 1) in order to re-establish
the correct pressure.
CAUTION
If register R is completely unscrewed, the
regulator can not deliver the maximum
requested capacity.
In order to better assess the e󰀨ects of
adjustments, it is advisable to turn the
adjusting screws only one fourth of a turn
at a time and to verify the new conditions
before carrying out the further rotation.
PERIODICAL CHECKS
Only for PRX/120, PRX/125, PRX-AP/120
and PRX-AP/125 Pilots:
Gas-tightness Test
When starting up the regulator, and at regular intervals,
check gas tightness as follows:
a. Slowly close downstream cut-o󰀨 valve.
b. In order to avoid excessive lock-up pressures, close the
APPARECCHIO TIPO /DEVICE TYPE
Wau
DN2
DN1
MATRICOLA
bar
bar
SERIALNr.
°C
FLUIDO GRUPPO
FLUIDGROUP
ANNO
YEAR
HARMONIZED STD.
bar
NORMEARMONIZ.
LEAKAGECLASS
CLASSEDI PERDITA
FUNCTIONALCLASS
CLASSEFUNZIONALE bar
Wao
Wa
TS
bar
pao
Cg
PS
body bar PT=xPS bar
PS
covers
EN
bar
pmax
BOLOGNAITALY
O.M.T.
1.5Note 4Note 3
Note 2
Note 1
1
-
DIMENSIONS AND WEIGHTS
Table 2. Dimensions (mm) and Weights (kg)
CODE PRX FULL RANGE PRX-AP FULL RANGE
A 65 65
B 215 257
Weight 3.2 3.5
Figure 2. Label for PRX Series Pilots
Figure 3. PRX Series Pilots Dimensions (mm)
AA
B
B

3
PRX Series
valve and simultaneously open the outlet vent tap. In case
of safety slam-shut device being tted, keep this valve
manually open in order to prevent it from tripping.
c. Slowly close the vent tap and read the lock-up pressure
value. An increase in outlet pressure will initially be
detected, after which pressure will stabilize. If, on the
contrary, outlet pressure continues increasing, then the
seal is defective. Check if leak is ascribable to pilot or
regulator.
Checking Pilot Gas Tightness
a. Link up together connection A, connection B, a vent tap
and a pressure gauge with appropriate scale.
b. Close connection L.
c. Slightly open vent tap, feed either gas or compressed air
to the pilot through connection S. Pressure gauge will
show the pilot set pressure.
d. Close vent tap and read the lock-up pressure value,
which should be less than 0.4 bar. If this value is higher
than 0.4 bar, pilot pad or seal seat are worn out or
damaged.
e. Use soapy water to check there are no gas leaks.
Only for PRX/182 Pilots
and PRX/131 Booster Valves:
Pilot tightness should be tested regularly by referring to the
following procedure:
a. Supply tting A with normal operating pressure.
b. Make sure there is no gas outow from tting B.
SEP STATEMENT
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,
national regulations, if any, and specic
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.
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:
• drainage to safe area via drain lines of foreign materials, if
any, by inow 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
• periodical check/maintenance for surveillance shall be
carried out complying with national regulations, if any, and
specic manufacturer recommendations.
MAINTENANCE
CAUTION
Maintenance should be carried out by skilled
personnel to ensure good servicing results.
Contact our technical support representatives
or our authorized dealers for any information.
Let gas under pressure ow out of the
relevant part of the system before servicing.
General Maintenance
a. Disconnect and remove the pilot from the line.
b. Fully unscrew the adjusting screw (key 1).
c. Unscrew the cap (key 3), remove the spring holder (key 6)
and the spring (key 7). Replace the O-rings (key 4 and 5).
d. Loosen screws (key 10), remove the upper cover (key 8)
and the lower cover (key 21). Replace the O-ring (key 18).

4
PRX Series
e. Lock the stem (key 23) by inserting a key into the notches
and unscrew nuts (key 20 and 26).
f. Disassemble the parts and replace the diaphragm
(key 14) and the pad (key 22).
g. Unscrew the seat (key 19) and replace the O-ring (key 17).
h. Use petrol to cleanse the pilot body and all metal parts. Blow
them thoroughly with compressed air and check for clear
holes along the gas conduits. Replace any worn parts.
Reassembly
Reassemble all parts by following in reverse order the assembly
as described above (see General Maintenance section).
As parts are assembled, make sure they move freely
causing no friction.
Make sure to:
a. O-rings and diaphragms should be lubricated by applying a
thin layer of ‘Molykote 55 M’ grease.
Pay attention not to damage them during reassembly. All
other pilot parts require no lubrication.
b. The cover clamping screws (key 10) should be tightened
evenly to ensure proper tightness.
c. Pilot operation, calibration and tightness should be tested as
described in the Gas-tightness test section.
d. Previously disassembled ttings must be connected. Check
for leaks by using suds.
SPARE PARTS
Spare parts storage shall be done by proper procedures
according to national standard/rules to avoid over aging of
rubber parts or any damage to critical parts.

5
PRX Series
PARTS LISTS
Type PRX/120, PRX/125,
PRX-AP/120 and PRX-AP/125 Pilots
(See Figure 4)
Item Description
1 Adjusting screw
2 Nut
3 Cap
4* O-ring
5* O-ring
6 Spring carrier plate
7 Spring
8 Upper cover
9 Spring carrier plate
10 Screw
11 Washer
12 Filter
13 Plate
14* Diaphragm
15 Plate
16 Body
17* O-ring
18* O-ring
19 Seat
20 Nut
21 Lower cover
22* Pad holder unit
23 Stem
24 Plate
25* O-ring
26 Nut
27 Adjusting screw
28* O-ring
29 Plate
30 Ring nut
31 Screw
32 Adjusting screw with hole
33 Plug
34 Plug
35 Spring barrel extension for AP version
Type PRX/181, PRX/182 Pilots and
PRX/131 Booster Valve
(See Figure 5)
Item Description
1 Adjusting screw
2 Nut
3 Cap
4* O-ring
5* O-ring
6 Spring carrier plate
7 Spring
8 Upper cover
9 Spring carrier plate
10 Screw
11 Washer
12 Filter
13 Plate
14* Diaphragm
15 Plate
16 Body
17* O-ring
18* O-ring
19 Seat
20 Nut
21 Lower cover
Item Description
22* Pad holder unit
23 Stem
24 Plate
25* O-ring
26 Nut
28* O-ring
29 Plate
31 Screw
33 Plug
34 Plug
Type PRX/181-PN and PRX/182-PN Pilots
(See Figure 6)
Item Description
36 Lower cover
37* O-ring
38 Special connection
Rubber parts marked with (*) are supplied in the “spare parts
kit”, recommended as stock.
To order the kit it is necessary to communicate to us the type
of the pilot and its serial number.

6
PRX Series
27
28
29
30
31
30
28
32
33
27
28
29
30
31
34
28
B
SL
R
D
B
S
D
35
4
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
14
18191311
20
10
11
21
22
23
24
A
A
B
A
18
11
26
25
LM/1390
TYPE PRX/120 AND PRX/125
Figure 4. Type PRX/120 and PRX/125 Pilots
AP VERSION
TYPE PRX/120 VERSION - SECTION A-A TYPE PRX/125 VERSION - SECTION A-A
CODE BOOT TRIM TUBE AND HARD TRIM
A Downstream impulse Downstream impulse
B Outlet discharge Pilot feed
S Pilot feed Outlet discharge
LTo regulator loading
pressure chamber
To regulator loading
pressure chamber
Table 3. Type PRX/120 Connections
SCHEMATICASSEMBLIES

7
PRX Series
B
A
A
L
B
S
33
28 31 29
28
34
34
22
19
14
17
16
18
1413
1
2
3
4
5
6
7
8
9
10
11
12
11
20
10
11
21
23
24
15
18
11
13
26
Figure 5. Type PRX/182 Pilot and Booster Valve Type PRX/131 Figure 6. Type PRX/181-PN and PRX/182-PN Pilots
TYPE PRX/182 AND PRX/131
36
37
15
15
25
37
18
11
14
38
36
TYPE PRX/181-PN AND PRX/182-PN
TYPE PRX/182-PN
TYPE PRX/181-PN
SECTIONA-A

PRX Series
The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Tartarini is a mark of O.M.T. O󰀩cina Meccanica Tartarini s.r.l.,
a business of Emerson Process Management.
The contents of this publication are presented for informational purposes only, and while every eort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees,
express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specications of such products at any
time without notice.
Emerson Process Management Regulator Technologies, Inc., does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and
maintenance of any Emerson Process Management Regulator Technologies, Inc., product remains solely with the purchaser.
©Emerson Process Management Regulator Technologies, Inc., 2016; All Rights Reserved
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