Emerson Fisher Accu-Pressure Y693 Instruction Manual page 3

Key numbers referenced in this section are shown in
Figures 3, 4 and 5.
1. Use qualified personnel when installing, operating
and maintaining the regulator. Before installing,
inspect the regulator for any shipment damage or
foreign material that may have collected during
crating and shipment. Make certain the body
interior is clean and the pipelines are free of
foreign material. Apply pipe compound only to the
male pipe threads.
2. The regulator may be installed in any position as
long as the flow through the body is in the direction
indicated by the flow arrow attached to the body.
Install the regulator as close as possible to the
blanketed vessel using a straight run of pipe the
same size or larger as the regulator body. Position
the body (key 28) and/or diaphragm spring case
(key 23) so it will not collect moisture or debris
into the screened vent (as shown in Figure 2). If
the regulator requires repositioning, refer to the
body area maintenance procedures and/or the
diaphragm and spring case area maintenance
procedures in the Maintenance section to
reposition the screened vent for the application.
If a block valve is required, install a full flow valve
between the regulator and the blanketed vessel.
3. Attach a downstream pressure control line to the
female connection in the lower spring case. The
female pressure connection is a 1/2 NPT in the
steel or stainless steel lower spring case and
a 3/4 NPT for the aluminum lower spring case.
Connect the other end of the control line to the
vessel. To allow for self-drainage, install the control
line at an angle so that any liquid material will drain
away from the regulator. See Figures 4 and 5 for
the location of the external control line connection.
WaRnInG
!
If the regulator vents some gas or
a leak develops in the system, it
indicates that service is required.
Failure to take the regulator out of
service immediately may create a
hazardous condition. In hazardous
or flammable gas service, vented gas
may accumulate and cause personal
injury, death or property damage due
to fire or explosion. Vent a regulator
in hazardous gas service to a remote,
safe location away from air intakes or
any hazardous location. The vent line
or stack opening must be protected
against condensation or clogging.
TYPE Y693
VEnT
BlOCK
ValVE
ValVE
COnTROl
lInE
A6342
Figure 2. Typical Type Y693 Installation
4. For proper regulator operation, a spring case vent
(key 56) is required to allow atmospheric pressure
to register on the diaphragm. The spring case vent
must be kept open and positioned in such a manner
to prevent the spring case from collecting moisture,
corrosive chemicals or other foreign material. To
allow maximum flexibility in installing the regulator,
the vent assembly is supplied separately in a
bag. Install the vent assembly in the 3/4 NPT vent
tapping and position the vent pointed down as
shown in Figure 2.
Depending on the orientation of the regulator, the
elbow (key 75) supplied with the vent may not be
required to position the vent pointed down.
5. To remotely vent the regulator, remove the vent
and install obstruction-free tubing or piping into
the 3/4 NPT vent tapping. Provide protection on a
remote vent by installing a screened vent cap into
the remote end of the vent pipe.
6. If continuous operation of the system is required
during inspection or maintenance, install a parallel
regulator with a three-valve bypass around
the regulator.
Type Y693
VEnT
ValVE
VEnT
ValVE
BlOCK
ValVE
BlOCK
ValVE
GaS BlanKETInG PRESSURE
VESSEL / TANK
3