An electropneumatic magnet valve for a pneumatically actuated field device can include a valve member, an electromagnetic controller, a magnet valve member, and an activator. The valve member can be moveable between at least two operating positions for ventilating and/or exhausting a magnet valve exit. The electromagnetic controller can move the valve member between the operating positions. The magnet valve member operator can move, additionally with respect to the electromagnetic controller, the valve member independently of an operation of the electromagnetic controller. The valve member operator can include an activator to selectively generate/provide a magnetic field for contact free operation of the valve member via which the magnet valve member operator is changeable between a passive operating condition and an active operating condition.

Hydraulic valves for dampening pressure spikes and associated methods are disclosed herein. In one embodiment, a hydraulic valve for dampening pressure spikes includes: a spool configured to move axially inside the hydraulic valve; and a sleeve configured to at least partially house the spool. A location of the spool with respect to the sleeve may determine a flow of a working fluid through the hydraulic valve. A viscous damper is at least partially housed inside an opening in the spool, and a viscous friction between the viscous damper and the opening in the spool slows a motion of the spool.

An electromagnetic valve has: a coil; a casing encircling the coil and having a cylinder portion and nail portions; a movable core moving axially in the wound coil; a fixed core set at an opening end of the casing; a valve body fixed to the opening end of the casing together with the fixed core by bending inwards the nail portions; and a spool valve body moving axially in the valve body. The nail portion is provided with a wide width portion at a root side, a narrow width portion at a top side and a stepped portion between the wide width portion and the narrow width portion. The stepped portion is positioned at a substantially same position as an outer edge of one end portion of the valve body, or positioned at a cylinder portion side with respect to the one end portion outer edge of the valve body.

A servo valve has a movable element disposed inside a body, and a drive unit to slide the movable element in the axial direction. A first elastic portion on one end portion side of the body has a first elastic force to press the movable element toward the drive unit connected to another end portion of the body; a second elastic portion on another end portion side of the body has a second elastic force to press the movable element toward the one end portion side of the body. A connecting portion is connected to the second elastic portion, wherein at a neutral position of the movable element, the connecting portion abuts against an inner peripheral surface of the body and against the movable element. An end of one of the first and second elastic portions is fixed directly to the movable element, and an end of the other of the first and second elastic portions is connected to the connecting portion.

A double action directional fluid flow valve includes a stepped piston connected with a poppet valve and moveable by a controller between open and closed positions by applying a continuous pressure to a small diameter piston face and selectively applying and removing pressure from a large diameter piston face to move the poppet valve between an open position and a closed position.

A vacuum-keeping multistage vacuum-generating and vacuum-destructing valve includes a main body, which includes an introduction port, a vacuum port, a discharge port, and a vacuum-generating valve, in combination with a vacuum-destructing valve. The vacuum-destructing valve is arranged in combination with a flow conducting passage formed in the main body and connected to the vacuum port to allow a pressure fluid received through the introduction port to partly flow through the vacuum-destructing valve, and a vacuum-destructing two-port two-position valve is arranged in the flow conducting passage to increase flow rate of the pressure fluid passing therethrough to make a response of the vacuum port more sensitive in switching to a vacuum-destructing state. The ports of the main body are arranged in a detachable manner to increase service efficiency and ease part replacement. Two side seats are arranged to couple multiple such main bodies together to cope with complicated automatic processing operations.

A valve operating member includes a valve support portion, which supports a valve disk while allowing the valve disk to move relative to the valve operating member in a direction of an axis. An elastic member is disposed inside a valve chest. The elastic member constantly urges the valve disk toward the valve seat in the direction of the axis to cause the valve disk to be seated on the valve seat with an urging force. The valve support portion includes a valve engagement portion, which is engaged with an engaged portion of the valve disk seated on the valve seat, and separates the valve disk apart from the valve seat. When the valve disk is seated on the valve seat, the valve engagement portion is not in contact with the valve disk in the direction of the axis.

A servo valve is provided with a first elastic portion, a second elastic portion, and a connecting portion. The first elastic portion extends in an X direction inside a valve body and has a first elastic force exerted on a movable element toward an X2 direction. The second elastic portion extends in the X direction inside the valve body and has a second elastic force exerted on the movable element toward an X1 direction. The connecting portion is connected to the first elastic portion and the second elastic portion inside the valve body, and is in abutment against a step portion of the valve body and a spool of the movable element at a neutral position of the movable element.

A servo valve is provided with a first elastic portion, a second elastic portion, and a connecting portion. The first elastic portion extends in an X direction inside a valve body and has a first elastic force exerted on a movable element toward an X2 direction. The second elastic portion extends in the X direction inside the valve body and has a second elastic force exerted on the movable element toward an X1 direction. The connecting portion is connected to the first elastic portion and the second elastic portion inside the valve body, and is in abutment against a step portion of the valve body and a spool of the movable element at a neutral position of the movable element.

A directional control valve for selectively communicating a valve outlet to one of a vent port and a pressure supply port includes a poppet extending through a cage. Relative positioning of the poppet to the cage selects which of the vent and pressure supply port is communicated to the valve outlet. The poppet position relative to the cage is provided by supplying fluid pressure to one of the opposed sides thereof, and the poppet latches with the cage so that the fluid pressure on one of the sides of the poppet need not be maintained to maintain the poppet position in the valve.