Aqua Environment Inc 504 Installation guide

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 [phone]

drw 933 sh 2 ; 070708
MODEL 504 & 504H RELIEF VALVE
ASSEMBLY & DISASSEMBLY
PARTS LIST
ITEM QTY PART NO. DESCRIPTION
1 1 505 body
2 1 506-1 washer
3 1 507 guide
4 1 508-1 poppet
5 1 509-1 spring guide
6 1 510 pressure adj. screw
7 1 511 lock nut
8 1 504-8 spring (6000 PSI max)
1 504-8H spring for 504H (6500 PSI)
9 1 504-9 seat - 2-006 - 90duroViton
10 1 504-10 label
NOTES
1. Adjust using 5/16" Allen wrench
2. Inlet is 1/4" MNPT
3. Technical bulletin is 651
4. Repaiir kit - part number 504-12 includes items 4 and 9
1
2
3
4
5
6
7
8
9
Note 2