A valve including a valve seat assembly that includes a first valve seat sealing member positioned between a first valve seat retaining ring and a first radially inwardly extending flange that extends from an inner surface of a hollow valve retainer, and a second valve seat sealing member positioned between a second valve seat retaining ring and a second radially inwardly extending flange that extends from the inner surface of the hollow valve retainer. A valve member is configured to engage and disengage with the first and second valve seat sealing members to permit fluid to travel from a fluid inlet to a fluid outlet.

An electromagnetic actuator includes a pair of plate springs each of which is configured to produce elastic force in a predetermined direction in accordance with an amount of deformation; a movable member supported by the pair of plate springs to be movable in the predetermined direction; and a drive unit which is configured to drive the movable member in the predetermined direction in a non-contact state by means of electromagnetic force to be applied between the pair of plate springs in the predetermined direction.

Valve assemblies are described that provide magnetic coupling between a valve actuator and a valve body housing the valve rotor and stator. A valve assembly embodiment, includes, but is not limited to, a valve body, the valve body including at least one magnet, and a rotor and a stator configured to define a plurality of fluid flow passageways; a valve actuator configured to drive the rotor via a drive shaft; and an actuator mount coupled to the valve actuator and configured to magnetically couple with the at least one magnet of the valve body to magnetically couple the valve body and the valve actuator.

A mounting structure of a valve core seat of a pull-out faucet in a faucet body which has a main pipe and a branch pipe communicating with each other; a restricting portion is protruded out radially into the branch pipe from an inner diameter of an end of the branch pipe in communication with the main pipe; one side of the valve core seat has a boss; a stepped surface is formed the valve core seat surrounding the boss; the valve core seat is inserted from a lower end of the main pipe and installed at a height corresponding to the branch pipe, and the boss is inserted into the branch pipe through a space enclosed by the restricting portion, and the stepped surface is locked and fixed to the restricting portion. A pull-out faucet having a sensing function that includes the above mounting structure is also disclosed.