Aqua Environment Inc 873-1500 Manual

drw 875-1500 & 5000
rev1/89, 2/94, 980123, 980902,001217,080816; 090519; 090805PS; 090910PS; 090917PS
OPERATION AND MAINTENANCE
MODEL 873-1500 & -5000 REGULATORS
The model 873 is a piston type hand loading
regulator. It utilizes a balanced poppet design for high
flow and minimum effect of inlet pressure on outlet
pressure. The poppet assembly is contained in a
cartridge with internal filtration for easy in-field
changing. The regulator is self venting but is
optionally available without the vent.
SPECIFICATIONS
• Maximum inlet pressure 6000PSI (40 MPa)
• Maximum Outlet pressure
873-1500 1500 PSI
873-5000 5000 PSI
• Flow coefficient (C
v
) 0.8
(equivalent to 0.23" orifice)
• Rise of outlet pressure with
drop of inlet pressure
873-1500 35 PSI/1000 PSI
873-5000 110 PSI/1000 PSI
• Materials - body and cap - aluminum
internals - brass,stainless,
seals, - KEL-F, Viton
• Fittings 1/4" FNPT inlet
1/2" FNPT outlet
• Size 3" dia x 6" lg
INSTALLATION
Use a suitable pipe thread sealant such as 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. The inlet is on the left when facing
the adjusting knob with the two gage ports upward.
An optional panel mounting nut is available (part no.
952). This nut permits mounting the regulator using a
1.25" hole in a panel or plate. 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. The 1/2" port is the outlet.
The 1/4" port adjacent to the 1/2" port is the outlet
gauge port. The other two 1/4" ports are the inlet and
inlet gauge ports. Either of these ports can be used
as the inlet. Connect the inlet to the source gas such
as a high pressure storage tank. The outlet is capable
of being adjusted from 0 up. AN OUTLET GAUGE
AND RELIEF VALVE SET NO HIGHER THAN
MAXIMUM OUTLET PRESSURE SHOULD BE
CONNECTED TO THE OUTLET. A 1/2" NPT SIZE
RELIEF VALVE SHOULD BE USED FOR FULL
PROTECTION. IF THE INLET PRESSURE CAN
EXCEED 6000 PSI A RELIEF
VALVE SHOULD ALSO BE INSTALLED AT THE
INLET TO PREVENT EXCEEDING 6000 PSI.
OPERATION
Outlet pressure is adjusted by knob 10 (refer to
drawing) to the desired value as read on the outlet
gauge. When reducing the pressure the regulator will
self vent via the vent hole near the cap. This is normal.
When reducing set pressure reduce pressure to below
the new setting then increase pressure to the new
setting. If in-field adjustment is to be avoided, the knob
10 can be replaced by a bolt and lock nut. A 3/8" by 24
thread per inch bolt with a minimum thread length if one
inch is required.
MAINTENANCE & REPAIR
CAUTION As with any regulator or valve,
particulates or moisture can plug or freeze the internal
filter or valve seat. This can occur when up-stream
dryers are not changed or remain unused for long
periods allowing corrosion materials to accumulate. In
critical applications where it is important not to lose flow,
a larger particulate filter should be used upstream. Also
an orifice such as the Aqua model 796 should be used
downstream. This reduces the tendency to freeze
when moisture is present. Consult factory for details.
The user should establish time intervals for changing
the valve cartridge, filter and upstream dryers based on
experience and service conditions. No representation
is made herein as to time intervals as each use is
unique. Back-up systems should be used in very
critical applications since field maintenance is hard to
insure. The poppet cartridge 895 is a factory
assembled item and should be replaced if required and
not disassembled unless absolutely necessary. Spare
cartridges are available at a nominal cost and should be
kept on hand if rapid repairs are required. IN ALL
CASES THE UNIT CAN BE RETURNED TO THE
FACTORY IF APPLICABLE OR DEALER FOR REPAIR
UNDER WARRANTY 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.
If leakage occurs through the regulator or out the
regulator vent, allow the inlet and outlet pressure to
equalize by shutting off the inlet. If leakage continues
after the inlet and outlet equalize the vent seat 5 or
piston seal 14 are leaking. Replace these. If leakage
stops when the inlet and outlet pressure equalize the
poppet cartridge item 1 is leaking. Replace this.
Aqua Environment Inc.
3100 Kerner Blvd, Ste N, San Rafael, CA 94901, [phone]

AQUA ENVIRONMENT CO. INC. drw 875-1500&5000 pg 2 of 2
ASSEMBLY & DISASSEMBLY -
MODELS 873-1500 & 5000 REGULATOR
ITEM QTY PART NO. DESCRIPTION
1 1 895 poppet assy
2 1 893 body
3 1 879 cap
4 1 848 piston for -5000
1 947 piston for -1500
5 1 946-1 vent seat (vented)
1 1035-1 seat- not vented
6 1 849 spring guide
7 1 903 cap
8 1 410 spring guide
9 1 378-2 adjusting screw
10 1 379-30 knob
11 2 379-37 bearing plate
12 1 379-38 bearing
13 1 379-5 spring
14 1 876-15 seal (2-010 V90) -5000
1 876-29 seal (2-015 V90) -1500
15 1 876-15 seal (2-010) Vit. 90
16 1 876-28 seal (2-135 Vit. 90
17 1 876-116 seal (2-020) vit. 90
18 1 919 piston hsg -5000
1 920 piston hsg -1500
19 1or2 952 mount nut - optional
20 979-xxxx REPAIR KIT - includes
items
1,4,5,14,15,16,17,18
NOTES
1. Technical bulletin - 874
895 poppet cartridge assy - drw 896
2. Use Dow silicone grease 111 or
equivalent on threads. Use Cristo-lub MCG
121 on seals. Use Slick 50 EP grease or
equivalent on bearings 11 and 12 and on
threads between items 7 and 9.
3. ASSEMBLY
a. Clean all parts and insure there are no
visible chips or particulates.
b. Inspect vent seat 5 under 10X
magnification at sealing edge. Wipe clean
as required.
c. Install cartridge 1 with seal 16 in
housing 2. Torque to 10 to 20 ft lbs.
d. Install seal 14 on piston 4. Pack heavily
with Cristo-lub MCG 121.
e. Carefully slide piston 4 into hsg 18 as
shown.
f. Install seal 15 and vent seat 5 into
piston as shown.
g. Install seal 16 as shown.
h. Screw cap 3 and body 2 together. Hold cap
3 downward so seat 5 does not fall out during
assembly. Torque to 20 to 40 ft lbs using a
strap wrench. Insure metal to metal contact
is made between body and piston housing. As
indicated by sudden increase of torque.
i. Install spring guide 8. then bearing plate
11, then bearing 12, then second bearing
plate 11, then spring 13, then spring guide 6
into cap as shown. Use ample Slick 50 EP
grease or equivalent on the bearings.
Silicone spray can be used to coat these parts
and act as a preservative.
j. Screw cap 7 onto cap 3. Hold cap 7
downward so parts stay in place during
assembly. Torque to about 20 ft lbs.
k. Install adjusting screw 9 and knob 10 as
shown using Slick 50 or EP grease.
4. model 873-xxxxNA denotes fixed
adjustment and uses a bolt and locking nut
instead of items 9 and 10.
5. model 873-xxxxNV denotes non vented
regulator.
2
3
4
6
7
VENT
outlet inlet
15
17
16
13
12
11
10
9
8
7
6
4
5
3
2
1
14
18