Aqua Environment Inc 873 Operation And Maintenance Manual

drw 875-400 1/89, 980123, 990804,010619; 090519; 090805PS; 090910PS; 090917PS
OPERATION AND MAINTENANCE
MODEL 873-400 REGULATOR
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
MPa)
• Outlet pressure
• Flow coefficient (C v )
(equivalent to 0.23" orifice)
• Rise of outlet pressure with
drop of inlet pressure
• Materials - body and cap -
internals -
seals, -
• Fittings
• Size
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.
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 to 400 PSI. AN OUTLET
GUAGE AND RELIEF VALVE SET NO HIGHER THAN
400 PSI 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.
AQUA ENVIRONMENT CO,. INC.
3100 Kerner Blvd, Ste N, San Rafael, CA 94901, (415) 453 8157
6000 PSI (40
0 to400 PSI
0.8
10 PSI/1000 PSI
aluminum
brass,stainless,
KEL-F, Viton
1/4" FNPT inlet
1/2" FNPT outlet
3" dia x 6" lg
The regulator is NOT
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.
MAINTANENCE & REPAIR
CAUTION
As with any regulator or valve,
particulates or moisture
internal filter or valve seat.This can occur when up-
stream dryers are not changed or remain unused for
long periods allowing
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.
should establish time intervals for changing the
valve cartridge, filter and upstream dryers based on
experience and service
representation is made herein as to time intervals as
each use is unique. Back-up systems should be
used in very critical
maintenance is hard to insure.
cartridge 895 is a factory assembled item and
should be replaced
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.
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.
can plug or freeze the
corossion materials
The user
conditions. No
applications since field
The poppet
if required and not
If leakage
to