Drw 933
6/89, 11/15/96, 001217; 061128; 070708;090805PS; 130802
OPERATION AND MAINTENANCE
MODEL 504 & 504H RELIEF VALVE
The model 504 is an economical,
small, high pressure
relief valve having
excellent set pressure control over
a large pressure range to 6000
PSI. (6500 PSI for the
504H model)
It stays bubble tight to within a few PSI
of
set pressure and reseats bubble tight even after
many
vent cycles. Safety wire holes are provided for
optional locking of set pressure adjustment.
SPECIFICATIONS
• Set pressure -------------
adj. 900 to
6000 PSI (6500 PSI
for 504H)
• Leakage -------------------
bubble tight
• Max. flow (air) ------------
100 SCFM at
3000 PSI
50 SCFM at
1500 PSI
• Equivalent orifice --------
.078 inch dia.
• Fluids -----------------------
gas or liquid
• Inlet -------------------------
1/4" male NPT
• Outlet -----------------------
side vent
• Size -------------------------
7/8" hex by 2.1"
long
• Temperatures ------------
-40F to 160F
• Materials ------------------
bronze,
anodized
aluminum, &
Viton
INSTALLATION
Use pipe thread sealant Teflon tape on inlet and
outlet threads.
Avoid over torquing pipe thread.
Normal torque applied with a 6 or 8 inch long wrench
is
ample. Use ample Teflon tape - 3 or 4 turns, not 1
or 2
turns. It is important to maintain piping internals free
of
particulates such as metal chips, dirt,
weld slag, etc. If
present these will tend to lodge in the relief valve
when it opens causing damage to the seat and
leakage. Since it is
difficult to keep piping completely
clean during assembly it is advisable to blow
high
velocity air through the system and outthe relief valve
port just prior to installing it.
This can normally clean
the system of
particulates. A high pressure air tank
can provide a strong flow for this
cleaning operation.
Suitable ear and eye protection should be
used when
flowing high pressure air.
It is NOT advisable to install
any type
of filter before the relief valve. A filter could
become clogged disabling the safety function
of the
relief.
The
relief can be either set prior to installing in the
system or after. Set
the relief above set pressure
using
the adjusting screw (item 6 in the drawing).
Bring system pressure up to desired relief valve
pressure then back off the adjusting screw until the
relief valve vents.
Use the locking nut (item 7) to
lock the position of the set screw. Cycle pressure
once or twice to insure the relief opens at the
desired pressure. Safety wire
holes are provided in
the body and adjusting screw.
The regulator is
NOT shipped oxygen clean and should NOT be
used for oxygen service as provided. Consult the
factory for details on oxygen service.
MAINTENANCE & REPAIR
Routine maintenance is generally not required. As
mentioned above, the relief is sensitive to solid
particles flowing through it.
As with any relief valve,
these particulates tend to
lodge on the sealing
surfaces or damage
the sealing surfaces as they
pass through. The result is leakage after the
valve
reseats.
In the event of leakage, the valve can be
repaired as
follows. (Refer to
the drawing on the opposite side
of this sheet.) Remove adjusting screw 6, spring 8,
spring guide 5, and poppet 4. Inspect the sealing
edge of the poppet 4 for scratches
and seal surface
9 for imbedded particles. A 5X or
10X magnifier is
helpful for this inspection. In most cases the
problem
will be imbedded particles in the seal.
These can be removed with a Q
tip, or tooth pick. If
this does not correct the problem the seal 9 and
possibly the poppet
4 will need to be replaced. To
replace the seal 9, remove poppet guide 3 using a
large screwdriver. If a new seal is
not available the
old
seal can be turned over and reinstalled. This
exposes a fresh sealing surface.
The seal is a 90
durometer (extra hard) size 2-006 O ring.
These are
readily available.
When installing the seal insure
washer 6 is
installed under the seal as shown.
Insure the seal and washer stay in place until
the
guide 4 is installed. Torque guide 4 about as
tight
as possiblewhile holding the relief valve body - i.e.
without using a wrench on the body.
IN ALL CASES THE UNIT CAN BE RETURNED TO
THE FACTORY OR DEALER FOR REPAIR UNDER
WARRANTY IF APPLICABLE OR AT A NOMINAL
CHARGE. Maintenance or repairs should only be
done by qualified personnel in a clean environment
by following the drawings and parts lists herein.
AQUA ENVIRONMENT INC.
3100 Kerner Blvd. Unit N, San Rafael, CA 94901 (415) 453 8157
