Installa on, Use and Maintenance RD10‐RA10‐en Rev.08/2018
Page 8
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4.0 MAINTENANCE
Note: before starting any maintenance operations consult the “Safety Information” in chapter 1.
Before operating the reducer:
depressurize the system
close the upstream shut-off valve (Pic.1 and 2 Pos. 1)
fully unload the calibration spring by acting on the ring nut “1” Pic.3.
close the downstream shut-off valve ( Pic.1 and 2 Pos. 7)
wait until the whole pressure reducer reaches the ambient temperature
The reducer is not subjected to ordinary maintenance, but it is recommended to disassemble it every 12/18
months for a precautionary control of the components. The parts which show signs of wear must be replaced.
Specifications of the Spare Parts are provided in paragraph 5.0.
Before performing any controls or installing the spare parts, make sure that the valve is intercepted and that the
upstream and downstream pressure is relieved to zero; then rotate the spring pushing plate "1" Pic.3 so as to fully
unload the spring.
The pipe "4" Pic.1 and 2 of the downstream sensing line must be detached from the actuator.
ATTENTION!!! The balancing bellows provided inside the reducer (Pic.8 Pos.15) is
designed to support 10,000 cycles. Any break would let the fluid contained in the pipe
go out. It is recommended to periodically replace the bellows, according to the actual
use of the reducer. Do not install the reducer in zones where any leakages of the
process fluid, due to a break of the bellows, may injure people and/or animals and/or
damage things.
ATTENTION!!! The diaphragm provided in the actuator (Pic.6 Pos.9) is designed to
support 10,000 cycles. Any break would let the fluid contained in the pipe go out. It is
recommended to periodically replace the diaphragm, according to the actual use of the
reducer. Do not install the reducer in zones where any leakages of the process fluid, due
to a break of the diaphragm, may injure people and/or animals and/or damage things.
4.01 TIGHTENING TORQUES
VALVE DIAME-
TER
SEAT (Pic.8
Pos.17)
Nm ±10%
BODY NUTS
(Pic.8 Pos.2)
Nm ±10%
DN15 - 1/2”
190
30
DN20 - 3/4”
190
30
DN25 - 1”
240
30
DN32 - 1” 1/4
350
30
DN40 - 1” 1/2
570
50
DN50 - 2”
570
50
DN65 - 2”1/2
700
100
DN80 - 3”
700
100
DN100 - 4”
850
100
ACTUATOR BLOCKING RING NUT
(Pic.4 Pos 4)
Nm ±10%
300
300
300
300
300
300
300
300
300
NUTS
(Pic.6 Pos 8)
Nm ±10%
40
40
40
40
50
50
ACTUATOR
MODEL
AR085
AR100
AR120
AR150
AR205
AR265