A valve closure for a piston compressor valve including: a valve seat having a plurality of passage openings, a shaft having an axis of rotation (D), and a rotatable closing element connected to the shaft for opening and closing the passage openings, the valve seat having a flat end face, to which the passage openings lead and a center (Z): the passage openings extending radially to the center (Z); and the closing element having a center point (M) and a plurality of closing arms extending radially to the center point (M). The shaft can be rotated about the axis of rotation and can be slid in the extension direction of the axis of rotation extending perpendicularly to the end face and through the center (Z); each closing arm having a sealing surface substantially complementary to the passage openings in accordance with the rotation of the closing element.

A piston compressor valve including a valve seat having a plurality of through openings including a closing element which is rotatable about an axis of rotation (D) for opening and closing the through openings and having an actuating drive for rotating the closing element, wherein the valve seat has an end face into which the through openings lead, wherein the closing element is movably connected to the actuating drive in the running direction of the axis of rotation (D), such that the closing element is both rotatable about the axis of rotation (D) and also movable in the running direction of the axis of rotation (D) relative to the end face, and having a sensor for detecting a condition variable (E) of the piston compressor valve, and having a control device which activates the actuating drive as a function of the condition variable (E).

A connector for transferring fluid and method therefor. The connector may have a first port and a second port which may be coupled together at a main channel with a valve element therein controlling fluid flow through the first port. The first port joins the main channel to provide a fluid path around the valve element and through the second port.

A piston compressor valve including a valve seat having a plurality of through openings including a closing element which is rotatable about an axis of rotation (D) for opening and closing the through openings and having an actuating drive for rotating the closing element, wherein the valve seat has an end face into which the through openings lead, wherein the closing element is movably connected to the actuating drive in the running direction of the axis of rotation (D), such that the closing element is both rotatable about the axis of rotation (D) and also movable in the running direction of the axis of rotation (D) relative to the end face, and having a sensor for detecting a condition variable (E) of the piston compressor valve, and having a control device which activates the actuating drive as a function of the condition variable (E).

A valve closure for a piston compressor valve including: a valve seat having a plurality of passage openings, a shaft having an axis of rotation (D), and a rotatable closing element connected to the shaft for opening and closing the passage openings, the valve seat having a flat end face, to which the passage openings lead and a center (Z): the passage openings extending radially to the center (Z); and the closing element having a center point (M) and a plurality of closing arms extending radially to the center point (M). The shaft can be rotated about the axis of rotation and can be slid in the extension direction of the axis of rotation extending perpendicularly to the end face and through the center (Z); each closing arm having a sealing surface substantially complementary to the passage openings in accordance with the rotation of the closing element.

A hydraulic steering unit is described comprising a housing (1) and a non-return valve (2) having a ball (3) and a valve seat (4) at an end of a channel (5) in the housing (1), wherein a movement of the ball (3) away from the valve seat (4) is limited by an abutment (7) in the channel (5). Such a steering unit should have a non-return valve which can be produced with low costs. To this end the abutment (7) extends transversely through the channel.

Embodiments of a compressor cutoff are presented. In an embodiment, the present invention includes apparatus for cutting off the flow of gas/liquid in the event of compressor failure or breakdown. In this embodiment, gas/liquid flows from its source through one or more passageways into a first input chamber, and also through one or more other passageways into a second input chamber, where the first and second input chambers are separated by a stop plunger. During the down-stroke of the compressor's piston, gas/liquid in the first chamber passes (or is drawn) through an inlet valve of the piston bore, and during the up-stroke of the piston that gas/liquid is forced through an outlet valve to a tank or other compressed gas/liquid receptacle. So long as the compressor operates normally, the pressure in the two input chambers (i.e., on each side of the stop plunger) will be substantially equal, thereby keeping the stop plunger in place. If, however, the compressor fails in a manner that exposes gas/liquid in the piston bore to the atmosphere, or otherwise results in a decrease in pressure in the piston bore, the pressure in the first input chamber will fall below the pressure in the second input chamber, thereby causing the stop plunger to move to a position in which it blocks the flow of gas/liquid from entering the inlet valve of the piston bore.

A connector for transferring fluid and method therefor. The connector may have a first port and a second port which may be coupled together at a main channel with a valve element therein controlling fluid flow through the first port. The first port joins the main channel to provide a fluid path around the valve element and through the second port.

Embodiments of a compressor cutoff are presented. In an embodiment, the present invention includes apparatus for cutting off the flow of gas/liquid in the event of compressor failure or breakdown. In this embodiment, gas/liquid flows from its source through one or more passageways into a first input chamber, and also through one or more other passageways into a second input chamber, where the first and second input chambers are separated by a stop plunger. During the down-stroke of the compressor's piston, gas/liquid in the first chamber passes (or is drawn) through an inlet valve of the piston bore, and during the up-stroke of the piston that gas/liquid is forced through an outlet valve to a tank or other compressed gas/liquid receptacle. So long as the compressor operates normally, the pressure in the two input chambers (i.e., on each side of the stop plunger) will be substantially equal, thereby keeping the stop plunger in place. If, however, the compressor fails in a manner that exposes gas/liquid in the piston bore to the atmosphere, or otherwise results in a decrease in pressure in the piston bore, the pressure in the first input chamber will fall below the pressure in the second input chamber, thereby causing the stop plunger to move to a position in which it blocks the flow of gas/liquid from entering the inlet valve of the piston bore.

The present invention relates to sealing valves that can be mounted within a container wall, enabling controlled fluid flow along both inner and outer surfaces of the sealing valve in the same distal direction.