DRESSER RB 1700 Instrucciones De Instalación página 7

Installation
• Check that the maximum inlet pressure is not
higher than the maximum allowable pressure of
the product
• Arrange enough room for the serving of the regu-
lator and/or the safety slam-shut valve
Before installing the product in the piping, the fol-
lowing must be checked:
• the upstream piping must be cleaned from all im-
purities (sand, welding slag, etc )
• the product must not be visibly damaged
• the inlet and outlet chambers of the product must
be perfectly clean
Make sure that the direction of gas flow corre-
sponds to the arrow on the valve body
The regulator must be fitted without undue stress
on the valve body Following torques should not be
exceeded:
3 /4"
Thread size
Max torque 80 Nm
Bolts M12
Max torque 35 Nm
Sensing line
RB 1700 / RB 1800 / RB 1800F regulator require ex-
ternal sensing lines for regulator
controllers An isolating valve on the safety shutoff
valve sensing line is not permitted.
Fig 1 gives a typical example of installation
with exception of RB 1700 - size
1
with exception of RB 1700
2
1" 1 /2
1"
110 Nm 140 Nm
M14 M16
55 Nm 85 Nm
and safety valve
1 2
/ "
3
4
Regulator Start-up
Before start-up, the installation must be
checked for leaks.
To start-up the regulator properly, proceed as fol-
lows:
• check that the upstream and downstream on/off
valves and the vent valve are all closed
• partially open the upstream on/off valve slowly
enough to pass a very small amount of gas;
• reset the safety shutoff valve -
See § Relatching the SSV"
Note that a safety shutoff valve with over- and
under-pressure protection is always closed in
absence of gas downstream of the regulator.
• check that the pressure rises slowly; the down-
stream pressure must stabilize around the set val-
ue If the pressure continues to rise, interrupt the
start-up procedure by closing the upstream on/off
valve and identify the cause of the malfunction;
• after the outlet pressure has stabilized, open the
on/off valve completely;
• then slowly open the downstream on/off valve
until the piping is completely filled
At this point, the pressure regulator is operative
7