Instruction Manual
December 2013
T208VR Series
T208VR Series Tank Blanketing Vacuum Regulator
Table of Contents
Introduction .................................................................. 1
Specifications .............................................................. 2
Principle of Operation .................................................. 2
Installation ................................................................... 4
Startup, Adjustment and Shutdown .............................5
Maintenance ................................................................ 5
Parts Ordering ............................................................. 9
Parts List......................................................................9
Figure 1. Type T208VR Vacuum Regulator
Introduction
Scope of the Manual
This Instruction Manual provides instruction for
installation, startup, maintenance and parts list for the
T208VR Series tank blanketing vacuum regulator.
Instructions and parts lists for other equipment used
with these regulators are found in separate manuals.
Product Description
The T208VR Series vacuum regulators are used
for precise control of small capacity, low-pressure
service applications where a constant vacuum must be
maintained. These direct-operated vacuum regulators
come in 3/4 and 1-inch / DN 20 and 25 body sizes and
have a 7/16-inch / 11 mm ori ce and a 1/4-inch spring
case vent connection with optional umbrella vent
assembly. The individual products are described
as follows:
Type T208VR
The Type T208VR is a vacuum regulator with internal
pressure registration requiring no control line.
Type T208VRM
The Type T208VRM has a control line connection and
blocked throat for external pressure registration.
D103760X012
www.fisherregulators.com
T208VR Series
Specications
The Specications section lists the specications for T208VR Series Tank Blanketing Vacuum Regulator. Factory
specications, such as maximum temperature, maximum inlet and outlet pressures, spring range, orice size and
material and seat material are stamped on the nameplate fastened on the regulator at the factory.
Available Congurations
Type T208VR: Direct-operated vacuum regulator
with internal pressure registration
Type T208VRM: Direct-operated vacuum regulator
with blocked throat and control line connection for
external pressure registration
Body Sizes and End Connection Styles
BODY SIZE END CONNECTION STYLES
Inch DN Gray cast iron 316L/316 Stainless steel
3/4 or 1 20 or 25 NPT NPT or CL150 RF
Maximum (Casing) Pressure
(1)
(1)
35 psig / 2.41 bar
Maximum (Casing) Vacuum Pressure
(1)
Full Vacuum
Maximum Allowable Vacuum Pressure
(1)
See Table 1
Maximum Downstream Vacuum Pressure
(1)
Full Vacuum
1. The pressure/temperature limits in this Instructional Manual and any applicable standard or code limitation should not be exceeded.
!
WARNING
Vacuum Control Pressure Ranges
See Table 1
Pressure Registration
Type T208VR: Internal
Type T208VRM: External
Orice Size
7/16-inch / 11 mm
Control Line Connection
1/2 NPT
Material Temperature Capabilities
Nitrile (NBR):
-20 to 180°F / -29 to 82°C
Fluorocarbon (FKM):
40 to 300°F / 4 to 149°C
Spring Case Connection
1/4 NPT
Approximate Weight
19 pounds / 8.6 kg
performed by unqualied person may
result in improper adjustment and
unsafe operation. Either condition
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
re and/or chemical contamination
may result in equipment damage
or personal injury. Only a qualied
person shall install or service the
T208VR Series vacuum regulators.
causing property damage and personal
injury or death.
Fisher® vacuum regulators must be
installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations
and Emerson Process Management
Regulator Technologies, Inc. (Regulator
Technologies) instructions.
If the vacuum regulator discharges
process uid or a leak develops in
the system, service to the unit may be
required. Failure to correct trouble could
result in a hazardous condition.
Call a qualied service person to
service the unit. Installation, operation
Principle of Operation
The T208VR Series vacuum regulators (Figure 2)
are used to maintain a constant vacuum at the
regulator inlet. A decrease in this vacuum (increase
in absolute pressure) beyond this value registers on
the diaphragm and opens the disk. This permits a
downstream vacuum of lower absolute pressure than
the upstream vacuum to restore the upstream vacuum
to its original pressure setting. On the Type T208VR,
pressure registers underneath the diaphragm. The
Type T208VRM has a control line connecting the
diaphragm casing to the vacuum line and an O-ring
stem seal blocking the throat causing registration
pressure to ow through the control line.
and maintenance procedures
(1)
(1)
2
ADJUSTING NUT
T208VR Series
CONTROL SPRING
VENT
DIAPHRAGM
PIPE PLUG
INLET PRESSURE (CONTROLLED VACUUM)
OUTLET PRESSURE (HIGHER VACUUM SOURCE)
ATMOSPHERIC PRESSURE
PUSHER
POST
LEVER
TYPE T208VR WITH INTERNAL PRESSURE REGISTRATION
VACUUM
PUMP
VACUUM BEING
CONTROLLED
STEM
VALVE PLUG DISK
ORIFICE
HIGHER VACUUM SOURCE
ADJUSTING NUT
CONTROL SPRING
VENT
DIAPHRAGM
CONTROL LINE
CONNECTION PORT
PUSHER
POST
LEVER
INLET PRESSURE (CONTROLLED VACUUM)
OUTLET PRESSURE (HIGHER VACUUM SOURCE)
ATMOSPHERIC PRESSURE
TYPE T208VRM WITH EXTERNAL PRESSURE REGISTRATION
STEM SEAL
THROAT SEAL
STEM
VALVE PLUG DISK
ORIFICE
Figure 2. Type T208VR Operational Schematic
3
T208VR Series
Installation
!
WARNING
Personal injury, property damage,
equipment damage or leakage due to
escaping gas or bursting of pressurecontaining parts may result if this
equipment is overpressured or is
installed where service conditions
could exceed the limits given in the
Specications or where conditions
exceed any ratings of the adjacent piping
or piping connections. To avoid such
injury or damage, provide pressurerelieving or pressure-limiting devices
(as required by the appropriate code,
regulation or standard) to prevent
service conditions from exceeding
those limits.
Additionally, physical damage to this
equipment could cause personal injury
or property damage due to escaping
gas. To avoid such injury or damage,
install the equipment in a safe and well
ventilated location.
Note
If this equipment is shipped mounted on
another unit, install that unit according to
the appropriate instruction manual.
1. Only personnel qualied through training and
experience shall install, operate and maintain this
equipment. For T208VR Series equipment that
is shipped separately, make sure that there is no
damage to or foreign material in it. Also ensure that
all tubing and piping have been blown free.
!
WARNING
This equipment may vent some gas to the
atmosphere. In hazardous or ammable
gas service, vented gas may accumulate
and cause personal injury, death or
property damage due to re or explosion.
Vent equipment in hazardous gas service
to a remote, safe location away from air
intakes or any hazardous area. The vent
line or stack opening must be protected
against condensation or clogging.
2. This equipment may be installed in any position as
long as the ow through the body is in the direction
indicated by the arrow attached to the body. If
continuous operation is required during inspection
or maintenance, install a threeway bypass valve
around the equipment.
3. To keep the vent assembly (key 26) from being
plugged or the spring case (key 3) from collecting
moisture, corrosive chemicals or other foreign
material, point the vent down or otherwise protect
it. The diaphragm casing (key 4,Figure 6) may be
rotated in order to obtain desired positioning.
4. To remotely vent the regulator, remove the vent
assembly (key 26) and install obstruction-free
tubing or piping into the 1/4 NPT vent tapping.
Provide protection on a remote vent by installing
a screened vent cap into the remote end of the
vent pipe. If continuous operation of the system is
required during inspection or maintenance, install a
three-way bypass valve around the regulator.
5. The Type T208VRM requires a control line. Be sure
to install the control line before putting the regulator
into operation. Make the control line as short and
straight as possible and do not install it in a location
where ow may be turbulent. Signicant restrictions
in the control line can prevent proper pressure
registration. When using a hand valve, it should
be a full ow valve, such as a full port ball valve.
Install the control line sloping downward toward the
tank to prevent condensation buildup and avoid low
points (or traps) that could catch liquid. The sensing
line must enter the tank above the liquid level at a
point that senses the vapor space pressure and is
free from turbulence associated with tank nozzles
or vents. The control line pipe should be at least
1/2-inch / 13 mm in diameter and increase 1 pipe
size for every 10 feet / 3.05 m of control line, with
setpoint less than 5-inches w.c. / 12 mbar.
4
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