Maintenance
▲
WARNING
Ensure the tank is at atmospheric pressure
before opening or removing a valve.
Pressure build-up inside the tank can
cause a spray to be emitted from the valve
if opened under pressure.
Springs are energy storage devices and
are dangerous if handled improperly.
Never loosen any nuts or screws until
all spring preload has been relieved.
Instructions for removing spring preload
are provided in this section. Always use
appropriate safety equipment including
safety glasses or shields any time you are
working with a spring-loaded valve.
Determine if the pressure/vacuum relief valve
assembly is an Enardo 860 Series pipe-away
in-line configuration or an Enardo 960 Series vent-to
atmosphere configuration.
Enardo 860 Series Pipe-Away
See Figure 8 for reference.
1. Remove the cylindrical cap(s) from the lid(s) by
removing the small screws.
2. Turn the spring plunger clockwise to remove all
spring preload. Note the number of turns the
plunger has been turned to facilitate reassembly.
3. Remove the hex bolts holding the lid to the body
and lift off the lid.
△
CAUTION
If the lid shows signs of any remaining
spring preload, do not continue with
the disassembly until this condition is
corrected. If the cap screws seem to be
under a load or if the lid starts to rise as
the cap screws are loosened, the spring
is still under load.
Figure 8.
Enardo
960 Series Pressure/Vaccum Relief Valves
2 AND 3 IN. RELIEF VALVES
HEX NUTS
TYPICAL
4 PLACES
SCREWS
TYPICAL
4 PLACES
4 AND 6 IN. RELIEF VALVES
SCREWS
TYPICAL
3 PLACES
ENLARGED HOLES
WITH HEX NUTS
TYPICAL 3 PLACES
WING NUTS
TYPICAL
3 PLACES
9
Enardo 860 and 960 Series
Outside North
America Only
