Are you interested in ordering Solenoid Operated Pinch Valves? The pinch valves from Bio-Chem Fluidics are solenoid-operated devices. They are designed to open and close tubing to achieve controlled fluid flow. Only the inside of the tubing contacts the fluid. Energizing the solenoid retracts the valve plunger. This either opens the tubing (in the normally closed configuration, as shown left) or closes the tubing (normally open configuration). De-energizing the solenoid allows a spring to push the plunger back to its original position. This returns the tubing to its original closed or open position.