Installa on, Use and Maintenance RD10‐RA10‐en Rev.08/2018
Page 11
OMC S.p.A: Via G. Galilei, 18 - 20060 - Cassina de Pecchi (MI) - ITALY - www.omcvalves.com - Tel.: (+39) 02.95.28.468
Our products a
re manufactur
e
d und
er ISO-9001 Qua
lit
y
As
suranc
e
S
yste
m
, approve
d b
y CSQ certifie
d
under nr.9
19
0.OMC2 - F
IRST
IS
SUE 1994/0
8/04
ENGLISH
5.0 AVAILABLE SPARE PARTS
DESCRIPTION
PICTURE
POSITION
Complete actuator
4
5
Diaphragm group
6
9
Bellows group / actuator
8
15
Seat
8
17
Body gasket
8
16
Calibration spring
7
10
Spring supporting bearing
7
13
6.0 MALFUNCTIONING: SYMPTOMS, CAUSES AND REMEDIES
Note: before starting any maintenance operations consult the “Safety Information” in chapter 1.
To disassemble this product you must first depressurize the system and wait until the reducer’s temperature is
equal to the ambient temperature
SYMPTOM
CAUSE
REMEDY
The downstream pressure exceeds the
required calibration one
Actuator not properly dimensioned
Control the design data and, if requi-
red, replace it (Chap. 4.03)
Sensing line pipe (Pic.1 pos.4)
obstructed
Disassemble the pipe and clear it
Actuator diaphragm (Pic.6 pos.9)
damaged
Replace (Chap. 4.04)
Plug or seat damaged
Replace (Chap. 4.05)
Bellows group damaged
Replace (Chap. 4.05)
In full-load conditions the downstream
pressure is lower than the required cali-
Actuator not properly dimensioned
Control the design data and, if requi-
red, replace it (Chap. 4.03)
The actuator is properly dimensioned but
the reducer does not provide the maxi-
mum flow rate
The reducer is not properly dimen-
sioned
Control the design data and, if requi-
red, replace it
The downstream pressure pipe is
too close to the valve or some
turbulences
Make sure about the proper installa-
tion of the reducer (Chap. 2.0)
The pressure reduction ratio is too
high.
Consider two valves in series to de-
crease the reduction ratio
Pressure pipe (Pic.1 pos.4) too
sensitive
Reduce the pipe section.
The downstream pressure fluctuates
ATTENTION!!!
The OMC reducers are univocally identified by a serial number applied on the reducer
and a serial number applied on the actuator, to order the spare parts or for any other need, always refer to
such serial numbers.