A vent arrangement for a respiratory pressure therapy device may include one or a plurality of vents configured with a variable aperture for communicating a flow of breathable gas. The vent arrangement may be configured with a cross section profile exposed to the flow of breathable gas communicating through the vent that does not change as the aperture size changes. A vent arrangement may include a plurality of the vents and the aperture size of each vent may be controlled independently or together, and may be controlled according to one or more input signals from one or more sensors. Examples of suitable input signals include flow, pressure, noise, accelerometer outputs, orientation of a patient or presence of any obstructions. A patient interface or an air circuit may include the vent arrangement, or the vent arrangement may be configured to connect with a patient interface or an air circuit.

The present flow regulating valve relates to devices for regulating the flow parameters of working media and can be used in equipment in the gas, oil, chemical, power, metallurgical and coal industries. The present flow regulating valve comprises a housing with a regulating element having inlet and outlet pipes with through passages and movable and immovable regulating teeth having a streamlined shape and terminating in a taper, wherein the size of the angle of the tapered portion is defined as 360/n, where n is the number of movable teeth. What is novel is that each tooth has an independent actuator, the immovable teeth have a cross section in the shape of an isosceles triangle, and the regulating zone has a cross section in the shape of a multi-point star. This design provides excellent characteristics in terms of response time and the overall weight of the structure, which is particularly relevant in the case of regulators having a cross-section diameter of 500 mm or more.

A well annular pressure control device includes a housing having a through bore and at least two iris valves within the housing. The iris valves comprise a plurality of vanes operable between an open position and a closed position to define an opening. At least one actuator is coupled to the plurality of vanes to move the plurality of vanes between the open position and the closed position.

The present invention relates to a flow control valve to be connected to a pipe. The valve includes: a plurality of fluid transport tubes having a geometrically variable cross-section and placed in parallel with each other; and a means for connecting to the pipe and located at one end of the fluid transport tubes.

The present invention relates to a flow control valve to be connected to a pipe. The valve includes: a plurality of fluid transport tubes having a geometrically variable cross-section and placed in parallel with each other; and a means for connecting to the pipe and located at one end of the fluid transport tubes.

The flow control valve has a drive, a housing with a regulating member provided with inlet and outlet fittings with passages and movable and fixed regulating teeth. The flow control valve comprises a composite housing having an upper and lower parts mounted on a support. The lateral surface of the drive disc is provided with Archimedes spiral, the regulating member is provided with evenly spaced projections in the central portion forming the fixed teeth, the movable teeth are located in the spaces between the fixed teeth. All the teeth being formed in a streamlined shape ending with a wedge of the cross-section angle defined as 360/n, n is the number of movable teeth. For engagement between the movable teeth and the drive disc for transmission of motion, a counter plate with notches corresponding to the Archimedes spiral parameters on the drive disc is installed on the movable teeth.

The flow control valve has a drive, a housing with a regulating member provided with inlet and outlet fittings with passages and movable and fixed regulating teeth. The flow control valve comprises a composite housing having an upper and lower parts mounted on a support. The lateral surface of the drive disc is provided with Archimedes spiral, the regulating member is provided with evenly spaced projections in the central portion forming the fixed teeth, the movable teeth are located in the spaces between the fixed teeth. All the teeth being formed in a streamlined shape ending with a wedge of the cross-section angle defined as 360/n, n is the number of movable teeth. For engagement between the movable teeth and the drive disc for transmission of motion, a counter plate with notches corresponding to the Archimedes spiral parameters on the drive disc is installed on the movable teeth.

The present invention relates to an adjustment mechanism (100) for variably adjusting the cross-section of a compressor inlet (22) and further relates to a corresponding compressor (20) including such an adjustment mechanism (100). The adjustment mechanism (100) comprises a plurality of rotatable orifice elements (110) and an actuation ring (120). The actuation ring (120) is mechanically coupled to the plurality of orifice elements 110 such that rotation of the actuation ring 120 causes movement of the orifice elements 110. The movement of the orifice elements (110) thereby adjusts the cross-section of a compressor inlet (22). The adjustment mechanism (100) further comprises a plurality of support members (140) which are arranged axially between the plurality of orifice elements (110) and the actuation ring (120). Additionally, the adjustment mechanism (100) comprises a spring (130), more specific a ring-shaped wave spring. The spring (130) is adapted to axially preload the plurality of orifice elements (110) and the actuation ring (120) when being in a mounted state.

Valve device based on a closing disc formed by disc parts which are movably arranged on activation bolts extending between two stop discs, and where movement of the activation bolts or disc parts in longitudinal direction of the valve device results in that the relative position between the disc parts are changed and the valve device opens or closes.

Valve device based on a closing disc formed by disc parts which are movably arranged on activation bolts extending between two stop discs, and where movement of the activation bolts or disc parts in longitudinal direction of the valve device results in that the relative position between the disc parts are changed and the valve device opens or closes.