A fieldbus solenoid valve system has a solenoid operated control valve mounted and operated by a solenoid pilot. A direct current power source is connected to a coil of the solenoid pilot and a driver for actuating the coil. A resistive element is in series with the power source, the driver, the solenoid and a ground. A frequency generator is connected to the circuit for creating a frequency pulse train to the coil having a characterization so as not to cause the solenoid pilot to actuate. The voltage is measured between the coil and resistive element and the measured voltage is compared to a base voltage value measured from the same circuit location. An indicator signal is displayed on the fieldbus solenoid valve system or externally when the measured voltage increases to a predetermined amount from said base voltage over time.

A control valve (1) for a camshaft adjustment device, and to an internal combustion engine having a camshaft adjustment device and a control valve (1) is provided. The control valve (1) includes a valve housing (3) and a pressure medium guiding insert (23) arranged coaxially in a recess of the valve housing (3). A discharge passage (27, 28) of the pressure medium guiding insert (23) transitions into a discharge duct (22) running in the axial direction, wherein the discharge connection T can be connected to the control connection A, B and wherein the discharge connection T is arranged in a region between the second end (8), which is opposite the first end (6), and the control connections A, B.

Examples are provided that describe a linear hydraulic valve. In one example a linear valve comprises a sleeve with a plurality of ports spaced apart from each other at a distance. The plurality of ports are associated with a plurality of pressurized fluids. A spool comprising a plurality of openings that correspond to the plurality of ports is provided within the sleeve. The plurality of openings are spaced apart in a manner that enables alignment of a given opening of the plurality of openings to a given port of the plurality of ports based on a given position of the spool within the sleeve. The linear valve comprises an actuator for moving the spool in a forward or reverse linear motion along a longitudinal axis of the sleeve. The spool may be moved to a given position based on selection of a pressurized fluid of the plurality of pressurized fluids.

The absence of high efficiency, compact fluidic pumps has until recently blocked the consideration of using hydraulic devices within portable and/or alkaline battery powered consumer and non-consumer products. The higher the functionality and programmability desired for a consumer and/or non-consumer product exploiting a fluidic pump then the more complex the overall fluidic system in terms of the number of actuators, valves, switches etc. within the fluidic system coupled to the one or more fluidic pumps. Accordingly, there exists a requirement to provide compact fluidic valves and switches to support configurability, programmability, and operation of these portable battery-operated consumer and non-consumer devices in conjunction with these newly available high efficiency, compact fluidic pumps. Such fluidic valves and switches should offer high efficiency, have a small footprint, be low complexity for high reliability and ease of manufacture, and low cost.

The invention relates to an electromagnetic valve comprising an electromagnet including a magnet coil, a magnet armature, a pole piece, a magnet yoke and a housing closing the magnetic circuit, and a valve assembly including a valve sleeve, a valve slider and a return spring, wherein the valve assembly is encompassed by the housing in its axial extension. According to the invention, the pole piece consists of an outer magnet pole and the valve sleeve surrounded by the magnet pole, wherein two fluid channels run in an axial direction between the valve sleeve and the magnet pole in fluid-tightly adjacent zones on the circumference of the valve sleeve and/or within the magnet pole, and wherein the valve sleeve has two transverse boreholes which are fluidically connected to the fluid channels and cooperate with control edges of the valve slider according to an axial position of the valve slider.

Disclosed is a railway braking system including a control device having a valve with a body having a cavity and a slide having an internal chamber, supply notches and drainage notches each having an overall passage cross-section for a pressure medium having a shape exhibiting an apex, and being movably mounted in the cavity, between a supply position where the supply notch is opposite a supply groove of the body, and a drainage position where the drainage notch is opposite a drainage groove of the body; the device being configured to allow a substantially stable control configuration, wherein the pressure value of the medium is limited, and wherein the slide is positioned in the cavity such that a control notch of the slide is opposite a control groove of the body while the supply and drainage notches are respectively at a distance from the supply and drainage grooves.

Provided is a valve device and a shock absorber that can prevent them from being in a failure state at the normal time and can freely set a passive valve even when both pressure control and passage opening/closing are performed by a solenoid valve. For this reason, the valve device includes a first passage and a second passage connected downstream of the pressure introducing passage, a solenoid valve that opens the first passage to control the upstream pressure and closes the second passage when energized, and that closes the first passage and opens the second passage when not energized, and a passive valve provided downstream of the solenoid valve in the second passage.

A servo valve includes a fluid transfer valve assembly comprising a supply port and a control port; a valve spool arranged to regulate flow of fluid from the supply port to the control port in response to a control signal; and a drive means configured to move the valve spool relative to the fluid transfer assembly in response to the control signal to regulate the fluid flow. The drive means is arranged to rotate the spool relative to the fluid transfer assembly, the spool provided with openings arranged to selectively align with or block flow channels in the fluid transfer assembly according to the direction and degree of rotation of the spool.

An electrically controlled valve for a shock absorber. The valve comprises a piston providing a primary fluid channel for damping fluid and a housing in which a piston holder is provided with an internal secondary fluid channel for damping fluid. Fluid flow (23) through the secondary fluid channel for damping fluid. Fluid flow through the secondary fluid channel is controlled by a spool movable within the piston holder wherein the movement of the spool is enabled by an electrically controlled actuator. Fluid flow through the secondary fluid channel is controlled by restriction at the inlet of the secondary fluid channel the inlet comprising one or more radial holes through the piston holder.

A valve portion of a solenoid valve has a sleeve and a spool. The sleeve has a housing portion larger than an insertion hole in a radial direction. An elastic member is arranged in the housing portion to urge a stator core toward a bottom of a yoke. The elastic member is in contact with a surface of the housing portion, which is non-contact with the spool, facing toward a solenoid portion. The elastic member is in contact with an end surface of a magnetic attraction core adjacent to the valve portion.