A valve (V, V1, V2) includes a housing (VG) and a piston (VK) displaceably guided therein. A first end (VK1) of the piston (VK) can be acted upon by a force, with the aid of which the piston (VK) is displaceable against a spring (F) acting upon a second end (VK2) of the piston (VK). The valve (V, V1, V2) has four switching conditions, in which four ports (A, B, P, T) in the housing (VG) are selectively connectable to one another or blocked with respect to one another. In a first switching condition, none of the ports (A, B, P, T) are connected to one another. The spring (F) is configured in such that, in the absence of an application of force onto the first end (VK1), the piston (VK) is held in a position, which corresponds to the first switching condition of the valve (V, V1, V2).

A sleeve is provided inside a body configuring a channel selector valve, and first and second guide portions with which outer peripheries of first and second land portions of a valve body are in sliding contact are formed on one end side and the other end side of the sleeve. The first and second guide portions are formed to axially overlap with the first and second land portions so as to abut the first and second land portions at all times when the valve body axially moves. The valve body includes a plurality of communicating paths penetrating through the valve body in the axial direction, and, in the sleeve, a first space formed on one end side of the valve body and a second space formed on the other end side of the valve body communicate with each other via the communicating paths.

A composite valve apparatus is attachable to an attachment hole. A relief-valve mechanism includes a first valve movable in the depthwise direction of an attachment hole. A thermo-valve mechanism includes a second valve fastened to a thermo actuator, and a cylindrical body that retains therein the second valve. The first valve of the relief-valve mechanism and the second valve of the thermo-valve mechanism have respective axial lines overlapping with each other. The thermo actuator is supported by the first valve, and the cylindrical body is fastened to or integrated with the first valve.

A valve having a metal insert with a fluid passage formed in the metal insert. A composite valve body is disposed at least partially around the metal insert and having at least one port in fluid communication with the fluid passage with the metal insert. A valve member is partially disposed in the metal insert and operable to control the fluid flow through the fluid passage of the metal insert and parts of the valve body.

A controllable gas-storage-form gas supply tube device includes a three way tube having a first opening, a second opening and a third opening; an electric control valve device installed in the three way tube for controlling connections of the three openings; an input tube, a close form air storage tube and a draining tube are connected to the first, second and third openings, respectively. When the electric control valve device is at a first position, the third opening is closed and the first and second openings are communicated so that gas from the input tube flows to the close form air storage tube and is stored therein. When the electric control valve device is at a second position, the first opening is closed, and the second and third openings are communicated so that gas in the close form air storage tube flow to the draining tube.

A hydraulic oil control valve is coaxially disposed with a rotational axis of a valve timing adjustment device. The hydraulic oil control valve includes a sleeve and a spool that is slidably moved in an axial direction within the sleeve in a radial direction. The sleeve includes an inner sleeve disposed radially outside of the spool and an outer sleeve defining an axial hole extending in the axial direction. The inner sleeve is inserted into the axial hole. The outer sleeve is fixed to an end portion of one shaft when an axial force is applied to the outer sleeve in the axial direction. An inner sleeve end portion of the inner sleeve in the axial direction away from the actuator protrudes from the outer sleeve away from the actuator in the axial direction.

An inner subassembly for assembling a valve assembly includes a spool defining a central bore that extends axially through the spool forming a spool annular wall, and including a spool cone tip that is disposed at the first axial end, as well as a hydraulic activation ridge extending radially outwardly from the spool annular wall, and that is disposed axially between the second axial end and the first axial end. The spool may further define a first bypass bore. A stem defines a first flow bore that aligns with the first bypass bore.

A hydraulic fluid control valve (HFCV) configured to recirculate an exiting hydraulic fluid from a first hydraulic actuation chamber to a second hydraulic actuation chamber is provided. The HFCV includes a spring well that combines a hydraulic fluid received from a hydraulic fluid pressure source with a recirculated hydraulic fluid from the first hydraulic actuation chamber and delivers the combination to the second hydraulic actuation chamber.

A braking system for a vehicle may include a regulating device disposed between a braking device and a pressure agent source that causes the braking device to move. The regulating device may include a slide having an internal chamber with a supply port, a venting port, and a regulating port opening into the internal chamber and through which a pressure agent from the pressure agent source may flow. The regulating port can be located between the supply port and the venting port. Each of the supply port and the venting port may have a general cross-section for passage of the pressure agent substantially having a shape with at least one apex.

A valve piston has a central axis along which mutually spaced control geometries are provided, which are bypassed by a passage that extends through the valve piston. The valve piston is, at least in portions, manufactured additively. A valve is includes a valve housing and a housing recess, in which the valve piston is received so that it is adjustable relative to the valve housing.