Electronics 590-24 - Manual (Page 4)

4
PRODUCT DESCRIPTION
The redesigned 5xx-24 Series MagnaValves provide improved performance and reliability
with an easier calibration mode. MagnaValves regulate the flow of ferrous media in abrasive
blast cleaning and shot peening machines. The 5xx-24 valves have a magnetic control sec-
tion (upper portion) and a shot flow rate sensing section (lower portion). This system of con-
trol makes the valve useful in both Open Loop and Closed Loop systems.
The flow rate ca-
pacity determines the size of the valve, either in lbs/min. or in kg/min. The 5xx-24 Series of
MagnaValves find their use in air-blast applications such as direct pressure, suction blast or
gravity-fed nozzle blast machines.
Specify calibration in
lb/minute or kg/minute,
as well as type and size of
shot with order.
THEORY OF OPERATION
MagnaValves have no moving parts, they rely upon very strong permanent magnets and
cancellation electromagnets to regulate the flow rate of shot. A signal from a shot flow con-
troller, model FC-24, will provide the appropriate control signal for flow rate. The customer
supplies an external 24Vdc power source required to power both the MagnaValve and FC-
24controller. The internal circuitry accepts a 0-10Vdc control signal and converts this signal
to a proportional duty-cycle control of the output signal for shot flow. As the shot falls
through the lower sensing portion of the valve, a 0-10Vdc signal is generated and sent back
to the FC-24 controller as a flow feedback signal. The controller compares this feedback
signal to the requested shot flow rate and adjusts the output signal and sends it back to the
MagnaValve to complete the closed-loop cycle of control.
LOCATION OF ADJUSTMENTS
All of the adjustments are accessible from the front of the MagnaValve (see figure on page
13 for details). It is inadvisable to change the factory settings. The identification label shows
the rated flow range. The calibrated valve produces a 10Vdc output signal at the specified
range, be it calibrated for kg/min or lb/min.
PRELIMINARY ADJUSTMENTS
There are no preliminary adjustments required but, after installation, it is recommended that
the zero adjust on the valve be fine-tuned. The valve is tested and calibrated at the factory
prior to shipment. The product label lists the full-scale range of the valve as well as the me-
dia type and size.
MagnaValve
Model
Flow Range
576-24 2 lbs/min 1 kg/min
578-24 30 lbs/min 13.5 kg/min
579-24 100 lbs/min 45 kg/min
580-24 200 lbs/min 90 kg/min
590-24 300 lbs/min 135 kg/min
577-24 10 lbs/min 4.5 kg/min