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Table 2. Maximum Spring and Diaphragm Casing Pressure
(1)
MAXIMUM PRESSURE DESCRIPTION
DIAPHRAGM
CASING MATERIAL
TYPES 627
AND 627OSX
TYPES 627R
AND 627LR
TYPES 627M
AND
627MOSX
TYPE 627MR
TYPES 627H,
627HM,
627HOSX
AND
627HMOSX
psig bar psig bar psig bar psig bar psig bar
Maximum pressure to spring and diaphragm
casings to prevent leak to atmosphere other than
relief action (internal parts damage may occur)
Die cast aluminum
250 17.2 250 17.2
Not Available
Not Available Not Available
Ductile iron
250 17.2
Steel or Stainless steel 250 17.2 800 55.2
Maximum pressure to spring and diaphragm
casings to prevent burst of casings during
abnormal operation (leak to atmosphere and
internal parts damage may occur)
Die cast aluminum 375 25.9 375 25.9 Not Available Not Available
Not Available
Ductile iron 465 32.1 465 32.1 465 32.1 465 32.1
Steel or Stainless steel 1500 103 1500 103 1500 103 1500 103 1500 103
Maximum diaphragm casing overpressure (above
setpoint) to prevent damage to internal parts
All materials 60 4.1 120 8.3 60 4.1 120 8.3 120 8.3
1. If the spring case is pressurized, a metal adjusting screw cap is required. Contact your local Sales Oce for details.
Type 627M or 627HM Regulator
De-Icer System Application
For the Type 627M or 627HM regulator de-icer system,
refer to the application shown in Figure 3. With a large
pressure drop across the working regulator, ice can form
within this regulator. The formation of ice decreases the
size of the orifice, so the regulator is unable to supply
enough flow to satisfy the downstream demand. When the
downstream pressure falls below the outlet pressure setting
of the Type 627M or 627HM regulator, the disk assembly
of the Type 627M or 627HM regulator moves off its orifice,
permitting alcohol to flow into the main gas line. The alcohol
carried to the main regulator by the flowstream prevents
additional ice from forming on the orifice. When normal
flow resumes and as pressure in the downstream system is
restored, the Type 627M or 627HM regulator shuts off.
Overpressure Protection
627 Series regulators have outlet pressure ratings that are
lower than their inlet pressure ratings. A pressure-relieving
or pressure-limiting device must be provided by the user for
the Types 627, 627H, 627M and 627HM regulators if the inlet
pressure can exceed the outlet pressure rating, since these
regulators do not have internal relief.
Types 627R and 627LR regulators provide internal relief
which limits the total outlet pressure buildup over setpoint.
Use Tables 3 and 4 to determine the total outlet pressure.
This internal relief may be adequate for the application, if
not, provide additional pressure relief or a pressure-limiting
device downstream.
Types 627OSX utilizes integral slam-shut device to provide
overpressure and underpressure protection by completely
shutting off the flow of gas to the downstream system.
Pressure is registered on one side of the diaphragm, piston
or bellows and is opposed by the setpoint control spring of
the manometric sensing device. The Type OS2 slam-shut
valve tripping pressure is determined by the setting of the
control spring.
WARNING
Overpressure–When the downstream pressure increases
above the setpoint, the pressure on top of the diaphragm
overcomes the spring setting and moves the manometric
device stem.
Underpressure–When the downstream pressure decreases
below the setpoint, the control spring pressure below the
diaphragm overcomes the downstream pressure and pushes
the diaphragm which moves the manometric device stem.
See Type OS2 Instruction Manual (D102778X012) for
additional information.
Startup and Adjustment
Startup
To avoid personal injury or property damage
due to explosion or damage to regulator or
downstream components during startup,
release downstream pressure to prevent an
overpressure condition on the diaphragm of
the regulator.
In order to avoid an overpressure condition
and possible equipment damage, pressure
gauges should always be used to monitor
pressures during startup.
1. Slowly open the upstream shut-off valve.
2. Slowly open the downstream shut-off valve.
3. Check all connections for leaks.
4. Make final control spring adjustments according to the
adjustment procedures.
6
627 Series
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