A solenoid valve is an electromechanically operated valve. The valve is controlled by an electric current through asolenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.
Solenoid valves are the most frequently used control elements in fluidics. Their tasks are to shut off, release, dose, distribute or mix fluids. They are found in many application areas. Solenoids offer fast and safe switching, high reliability, long service life, good medium compatibility of the materials used, low control power and compact design.
Besides the plunger-type actuator which is used most frequently, pivoted-armature actuators and rocker actuators are also used.
A motorized valve is a valve type that use an electric motor to open or close its mechanism. This type of valve is ideally suited to very large valve types or remote fluid control applications such as aircraft deicing, agricultural irrigation,and automated fire suppression. Most valve types are suited for motorized applications with some commonly used types being gate, ball, and butterfly. The motorized valve is also well suited to remote flow control applications where system inputs involve incremental valve operation. The internal fluid control mechanisms of motorized valves are generally identical to their manual counterparts; valve actuation inputs are the only difference between the two.
Valves play an integral role in fluid flow circuits ranging from the garden hose to hydroelectric power generation systems. Valve actuation can, however, present logistic problems when valves are too large to be practically opened or closed by hand, are in remote, inaccessible locations, or have to operate during periods when plants or installations are unmanned. The answer to these problems is the use of the motorized valve. This type of valve functions in exactly the same fashion as a manual variety with the exception of being actuated by an electric motor. This type of valve can be remotely opened or closed by an operator or by inputs from an automated system.