10
Double Check Pressure Equalizing Valve
The double check pressure equalizing valve
(22)
is provided to
prevent pressure build-up between the
RuptureSeal
™ valve
seat and the rupture disk. This special double check pressure
equalizing valve allows low pressure build-up to bleed-off, but
seals itself under pressure or vacuum
.
Warning:
DO NOT obstruct outlet of the Double
Check Pressure Equalizing Valve.
NOTE:
Regardless of NRS-3’s position, the Double Check Pressure Equalizing Valve
(22)
MUST be
mounted vertically with the filter/vent
(34)
pointing up (
é
).
Supplemental Mounting Support
If the
RuptureSeal
™ valve is to be mounted in the horizontal position,
it is recommended that some type of supplemental support be
provided to relieve any stress the valve may put on the chiller’s relief
stub (see Figure 7). The installer shall determine the best way to
provide such supplemental support.
Figure 7 -
Supplemental Support
Chillers Utilizing R-123
(
special piping instructions
)
When installing a
RuptureSeal
™ valve on a chiller utilizing
R-123 refrigerant, it is suggested that the output of the
Double Check Pressure Equalizing Valve
(22)
be teed into
the water drain line
(37)
(see Figure 8). This will prevent
seepage of R-123 refrigerant into the occupied space in the
event of a failure of the rupture disk.
Figure 8 -
Special Piping for R-123 Systems
(22) Double Check
Pressure
Equalizing
Valve
(14) 1/8" NPT Cross
Connection
(43) Stainless Steel
free floating ball
Double Check Pressure
Equalizing Valve
Figure 6
(35) Alarm Port
Hook-up
(21) Pressure
Guage
(34) Filter/Vent
Chiller
Supplemental
Support
Chiller
(31)
Drip
Leg
(50) Special piping from
Double Check
Pressure Equalizing
Valve to Water
Drain Line
(37 Water
drain
line to
drip leg