High Flow, Automatic, Primary Changeover Systems
HPC Series Primary Changeover Systems are
designed to provide a continuous supply of gas from two separate banks of cylinders. Capable of flow rates up to 50 scfm, the changeover allows the user
to deplete gas from one source without the concerns of gas outages and of wasting unused gas as a result of premature change-outs.
Primary changeover systems are designed for use in processes incorporating down streamline or station regulators located at the point of use. A downstream
line regulator (not included) will eliminate pressure variations to the process. The HPC Series incorporates two high flow diffusion-resistant regulators
available in either brass or stainless steel construction. They are supplied entirely installed on a stainless steel panel providing for convenient, wall-mounted
installation. The overall compact design allows for installation in areas where space is at a premium.
Note: See HPC Alarm Changeover Systems for additional information on prewired switches and annunciators.
The HPC Series incorporates two regulators set at slightly different delivery pressures. Gas discharges from the side with the higher setting first (primary
side) which is indicated by the "In Service" arrow located on the hand knob. The side with the lower delivery pressure setting will remain closed
until the primary side has been exhausted(approximately 180-160 psi residual pressure) at which time the changeover will automatically switch to the reserve
bank (secondary side). Since a fluctuation in outlet pressure will occur at this point, a downstream line regulator (not included)should be installed to
eliminate pressure variations to the process. When the operator is ready to service the depleted primary supply, the "In Service" arrow should
be rotated 180° to indicate that the reserve bank is now in service. The first source can then be changed without interruption of the outlet pressure.
Gas will continue to flow from the reserve bank until it is depleted and a changeover to the primary side occurs. The changeover process can be repeated
continuously as long as the depleted supply is replaced.
Maximum Inlet Pressure:
Model HPCH: 3000 psig
Model HPCL: 900 psig
Inlet Pressure Gauge:
Model HPCH: 0–4000 psig
Model HPCL: 0–1000 psig
Minimum Inlet Pressure: 300 psig
Delivery Pressure Gauge: 0–400 psig
Delivery Pressure Range:
160–200 psig non-adjustable
Gauge Size: 2" Dial
Operating Temp. Range: -40°F to 140°F
Flow Coefficient: Cv = 1.2
Flow Capacity: Up to 50 scfm Air
Cylinder Leads: CGA connection with
check valve nipple (standard)
Rigid Pigtail: 36" long w/ 5" dia. service loop,
providing a 23" useable length
Flexible Hose: 36" long
Inlet Connection: 1/2" NPTF port (body)
with CGA adapter installed and CGA
connections (as specified) on pigtail
Outlet Connection: 1/2" NPT male
with restricting flow orifice
Approximate Weight: 10 lbs.
Materials of Construction
Body: Brass or Type 316 SS Bar Stock
Gauges: Brass or Type 316 SS
Brass Systems: Brass Bar Stock
Stn. Stl. Systems: 300 Series SS Bar Stock
Internal Metal Parts Exposed to Gas:
Brass Systems: Brass and Stn. Stl.
Stainless Steel Systems: Type 316 SS
Check Valve Nipple:
Brass Systems: EPDM
Stn. Stl. Systems: Viton®
Diaphragm: Type 316 Stainless Steel
Brass with Brass assemblies
Type 316 SS with Stn. Stl. assemblies
Type 316 SS inner core & end fittings
Type 304 SS double overbraid
To order a changeover system, complete the part number using the "Part Number Key". For example, to order a HPC Series 2-cylinder change-over
regulator system for high pressure gases (>900psig), in brass construction, with flexible hoses, and with CGA 580 connections, the part number would
be HPCH-BF2-580. Order by complete part number.
Note: A two-cylinder changeover system does not include manifold headers. The cylinders are connected directly to the changeover
inlet leads (pigtails).
Warning: Advanced does not recommend the use of stainless steel components in manifolds designed for Oxygen service and will not provide
such manifolds with CGA 540 connections.