Introduction:
Valcor Scientific has designed and engineered rugged, reliable solenoid operated pumps
for more than 20 years.
These pumps are activated by a solenoid coil, which when electrically energized and
de-energized, move the piston back and forth to dispense liquids.
The SV600-Series pumps are cost-effective, low maintenance dispensers for a wide
variety of liquids compatible with stainless steel. Each model provides a different output
range.
Construction:
The pump materials in contact with fluids are FDA Generally Regarded As Safe grade of
polypropylene, borosilicate glass, and elastomers of either Viton, EPDM or Silicone.
For less aggressive fluids or those not requiring high-purity contact surfaces, Valcor
Scientific offers the SV500 Series of stainless steel dispensing pumps (see above).
General Operation:
The accompanying diagram illustrates the internal construction of the SV600-Series
pump. A unique feature of these pumps is the employment of a rolling diaphragm to isolate
the metal actuator parts from the wetted pump surfaces.
The pumps employ Valcor's exclusive dynamic o-ring pumping system. This o-ring system
seals the piston while allowing the pump chamber to refill. The piston is retracted when
the solenoid is energized, allowing liquid to enter the volume above the pump o-ring. A
return spring pushes the piston back down when the coil is de-energized.
The dynamic o-ring seal divides the pump into an upper and lower chamber. As the coil
is energized and de-energized, liquids are drawn into the lower chamber at the same time
as they are dispensed from the upper chamber.
The volume of liquid dispensed per stroke depends on the piston stroke length which can
be adjusted manually. Additionally, the frequency of stroking can be controlled digitally.
By adjusting stroke length and frequency, the desired flow rate can be achieved.
To adjust the liquid dispensed per stroke, a lock-nut is loosened on the solenoid stop
screw, the screw is rotated to increase or decrease the stroke length. The lock-nut is
then re-tightened.
To adjust the frequency of stroking, the coil can be energized more or less frequently
until the desired dispense rate is achieved.
