Pneumatics
Pneumatic controls include:
• Two pinch valves (PV1 & PV2)
• Two pressure regulating valves (PR1 & PR2)
• Two N/C solenoid valves (SOL311 & SOL319)
• One N/O solenoid valve for venting (SOL351)
• Two check valves (CV1 & CV2)
The pinch valve pressure controls the pinch valve. The conveying pressure controls the vessel. A
safety valve opens at 7 bar (102 psi) and limits the maximum pressure in the vessel.
PV1 is operated by compressed air and controlled by SOL351.
Proximity switch PS219 (inside vessel) sends a signal to the PLC to indicate presence of
abrasive. If there is no abrasive, the PLC sends a signal to release the pressure from the vessel,
and then sends a signal to open the pinch valve. When the proximity switch senses abrasive
during refilling, a delay timer starts. When the delay timer ends, the pinch valve closes, and the
vessel pressurizes.
When SOL319 opens pinch valve PV2, pressure is released from the vessel.
© 2021 Flow International Corp.
Retrieved from Flow KB on April 14, 2021 PST
Ancillary option: PASER CF900 Abrasive Delivery System
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