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Electric Rotary Valve Selection Guide
The Bio-Chem Fluidics RV series of Electric Rotary Valves is available in three versions; the RV-E series comprises the valve head assembly only
with no motor or controller, the RV-SN series couples the valve head assembly to a two-phase hybrid stepper motor to drive the valve’s rotor
and the RV-SC series adds an intelligent controller / driver PC board with the stepper motor.
The RV-SC can be used in two distinct modes; Stand Alone-mode where external programs can be downloaded directly in the controller’s
EEPROM memory, and Direct-mode where the controller acts as a “slave” board in conjunction with a “master” external control system. (More
details on operating modes on page 6).
Applications
Bio-Chem Fluidics Electric Rotary Valves are typically used in one of two main applications; fluid selection/distribution applications where
either one stream is diverted to one of multiple ports or multiple streams are diverted to one outlet, and sample injection applications where
the valve can be used to load and inject fluids into a sample loop in two discrete steps.
Fluid Selection/Distribution
Bio-Chem Fluidics Electric Rotary Valves used as selection /
distribution valves allow for accurate and repeatable flow re-
direction. One input can be diverted to any one of multiple outlets,
or, multiple separate inputs
can be diverted to one
common outlet.
Sample Injection
Bio Chem Fluidics switching rotary valves can be used as “sample
injection” valves for analytical systems. They can facilitate “loading”
of a liquid sample into a “loop”, and “injecting” the sample into
an analysis module. This is especially useful in low-pressure
chromatography and Life Science
applications.
Step 1 - the sample can be loaded
into the sample loop while the
mobile phase is pumped directly
through to the column.
Step 2 - when the valve switches
to the inject position, the pump
connects to the sample loop and
the sample is carried onto and
through the column. The “sample
in” and “waste” ports are joined
but are isolated from the loop.
Flow Switching Configurations and Part Numbers
Flow configurations
1
2
3
4
1
2
3
4
Axial
port
1
2
Axial
port
4
3
1
2
3
4
5
6
1
2
3
4
5
6
Axial
port
Valve version
4 port switching 4-way selection /
distribution
4-way combination 6 port switching 6-way selection /
distribution
Part nos.
Valve head assy.
(page 4)
RV-EN0-J4C-PTNB RV-EN0-S4C-PTNB RV-EN0-N4C-PTNB RV-EN0-J6B-PTNB RV-EN0-S6B-PTNB
Valve w/motor
(page 5)
RV-SN2-J4C-PTNB RV-SN2-S4C-PTNB RV-SN2-N4C-PTNB RV-SN2-J6B-PTNB RV-SN2-S6B-PTNB
Valve w/motor
and controller
(page 6)
RV-SC2-J4C-PTNB RV-SC2-S4C-PTNB RV-SC2-N4C-PTNB RV-SC2-J6B-PTNB RV-SC2-S6B-PTNB
One input...
...diverted to one
of multiple outlets
Multiple
inputs...
...diverted to one
outlet
1
2
3
4
5
6
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Inject
1
2
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4
5
6
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Load