A concrete flow leakage-preventing shut-off valve includes an outer flexible casing configured to be disposed around a concrete delivery hose. A flexible inflatable bladder is disposed within the casing and defines a gas chamber therein. A gas intake/exhaust device extends through the casing and into the gas chamber such that pressurized gas introduced and exhausted from the gas chamber enables movement of the bladder to define closed and open concrete flow conditions of concrete relative to an outlet end of the hose. A clamping arrangement secures opposite ends of the casing and the bladder in radially and axially spaced apart relationship, and is configured to maintain a surrounding relationship of the casing and bladder with respect to the hose.

A fluid flow control valve includes a valve body with a fluid flow lumen therethrough and a valve member located within the fluid flow lumen. At least one of the valve body and valve member is resilient and respectively sized for movement between a normally closed position in which the valve member and a fluid lumen surface are in sufficient annular contact to block fluid flow through the fluid flow lumen and an open position in which at least one of the valve body and valve member flexes to a spaced apart position that allows fluid flow between them. Downstream fluid pressure may contact the valve body to enhance sealing. A fluid absorbent member may also be employed with the valve body. Flow control devices, such as medical fluid injection devices, and methods may employ this valve.

The invention relates to a flow control device (10) for industrial filter installations, said flow control device comprising: a valve device (20) which is located in a flow line to, in or from a filter installation, the valve device (20) having a closed-loop control section (23) which is connected to the flow line and which can be controlled in a closed-loop manner via at least one deformable membrane (30); a hydraulic device (40) which controls the pressure in a hydraulic duct (32, 46) in a closed-loop manner by means of an actuator (42), the hydraulic duct (32, 46) being connected to the valve device (20) in such a way that the membrane (30) increases or reduces the flow cross-section depending on the pressure in the hydraulic duct (32, 46); a drive (60) for driving the hydraulic device; and an open-loop control unit (80) which controls the flow control device (10) in an open-loop manner.

A concrete flow leakage-preventing shut-off valve includes an outer flexible casing configured to be disposed around a concrete delivery hose. A flexible inflatable bladder is disposed within the casing and defines a gas chamber therein. A gas intake/exhaust device extends through the casing and into the gas chamber such that pressurized gas introduced and exhausted from the gas chamber enables movement of the bladder to define closed and open concrete flow conditions of concrete relative to an outlet end of the hose. A clamping arrangement secures opposite ends of the casing and the bladder in radially and axially spaced apart relationship, and is configured to maintain a surrounding relationship of the casing and bladder with respect to the hose.

Embodiments disclosed herein provide systems and methods for an in-ground sprinkler to controller a liquid flow rate through a chamber, while reducing or eliminating leakage. Embodiments may utilize a flat, external surface that is configured to be flush with a ground surface to control the liquid flow rate through the in-ground sprinkler. In embodiments, a permanent magnet may be positioned on the flat, external surface to control an internal patch system. Responsive to the permanent magnet controlling the internal patch, liquid flowing through the chamber may be controlled.

Embodiments disclosed herein provide systems and methods for an in-ground sprinkler to controller a liquid flow rate through a chamber, while reducing or eliminating leakage. Embodiments may utilize a flat, external surface that is configured to be flush with a ground surface to control the liquid flow rate through the in-ground sprinkler. In embodiments, a permanent magnet may be positioned on the flat, external surface to control an internal patch system. Responsive to the permanent magnet controlling the internal patch, liquid flowing through the chamber may be controlled.

The invention relates to a flow control device (10) for industrial filter installations, said flow control device comprising: a valve device (20) which is located in a flow line to, in or from a filter installation, the valve device (20) having a closed-loop control section (23) which is connected to the flow line and which can be controlled in a closed-loop manner via at least one deformable membrane (30); a hydraulic device (40) which controls the pressure in a hydraulic duct (32, 46) in a closed-loop manner by means of an actuator (42), the hydraulic duct (32, 46) being connected to the valve device (20) in such a way that the membrane (30) increases or reduces the flow cross-section depending on the pressure in the hydraulic duct (32, 46); a drive (60) for driving the hydraulic device; and an open-loop control unit (80) which controls the flow control device (10) in an open-loop manner.