Universal Type of Pinch Valve:

This type of pinch valve has both N.O. (Nomally Open) and N.C. (Nomally Closed) side, which are simultaneously operated. This type of pinch valve can be configured for 3-way (dual tube), 2-way N.O. (single tube) or 2-way N.C. (single tube) operation. Installation of a tube in both sides is not required to have single-tube operations.

Dual Type of Pinch Valve:

This type of pinch valve has both N.O. (Nomally Open) and N.C. (Nomally Closed)side, which are simultaneously operated. This type of pinch valve can be configured for 3-way valve by using a Y-shaped fitting. Installation of a tube in each side is required to secure normal operations.

List of Solenoid Pinch Valves can be viewed from here.