An igniter 40 activated blocking device 10 blocks a fluid line 4 adapted to carry fluid. The blocking device 10 has a housing 30 disposed about the fluid line, a piston 20 housed in the housing, and an igniter 40 that when activated propels the piston 20 to block the fluid line 4. The igniter 40 generates a shock wave to move the piston 20 to block the line. The piston 20 crushes or squeezes a portion of the line 4 to close the line.

A valve control is configured for use with control valves and other flow controls. The valve control leverages a simplified structure to avoid problems with manufacture and reduce costs. This structure includes a support unit that compresses parts of a valve housing together. Inside of the valve housing, the structure incorporates diaphragms that cause a pair of balanced valves to move in response to changes in pressure of fluid in a conduit. For industrial application, the valve control finds use to maintain pressure of natural gas in pipelines downstream from a control valve.

The invention relates to a pinch valve comprising at least a body having connecting flanges, a sleeve made of elastic material and an actuator, wherein said pinch valve comprises first pinching means that is movable towards the sleeve, wherein as a response to an operation of the actuator, said first pinching means squeezes the sleeve at least partially to control a flow in said sleeve. In the pinch valve, the sleeve is curved, and said connecting flanges are not parallel, whereupon said sleeve is fixed to the body in such a manner that openings of said sleeve are not parallel either.

A pinch valve configured to be combined with an inversion apparatus. An elongated component, such as a rope, cable, or light train, is able to pass through the lumen of the pinch valve during the positioning and curing of a repair assembly into an underground pipe system. A deformable member positioned within the housing is movable between a first position having a first internal diameter and a second position having a second internal diameter that is smaller than the first internal diameter. In the second position the deformable member is moved to constrict around the elongated component as the component passes through the valve. This helps prevent pressure from escaping through the pinch valve by decreasing the space between the deformable member and the elongated component. In this manner, the internal diameter of the pinch valve is able to conform to various diameters of elongated components passing through the valve in real time by moving the deformable member to create the desired internal diameter.

A pinch valve configured to be combined with an inversion apparatus. An elongated component, such as a rope, cable, or light train, is able to pass through the lumen of the pinch valve during the positioning and curing of a repair assembly into an underground pipe system. A deformable member positioned within the housing is movable between a first position having a first internal diameter and a second position having a second internal diameter that is smaller than the first internal diameter. In the second position the deformable member is moved to constrict around the elongated component as the component passes through the valve. This helps prevent pressure from escaping through the pinch valve by decreasing the space between the deformable member and the elongated component. In this manner, the internal diameter of the pinch valve is able to conform to various diameters of elongated components passing through the valve in real time by moving the deformable member to create the desired internal diameter.

A fluidic device comprises a channel, a gate, and one or more additional elements. The channel is configured to transport a fluid from a source to a drain. The gate includes a chamber with an adjustable volume that affects fluid flow within the channel by displacing a wall of the channel toward an opposite wall of the channel based in part on fluid pressure within the chamber exceeding a threshold pressure. A high pressure state of the gate corresponds to a first chamber size and a first flow rate of the fluid. A low pressure state of the gate corresponds to a second chamber size that is smaller than the first chamber size and a second flow rate that is greater than the first flow rate. The additional elements are configured to reduce the threshold pressure past which the chamber decreases the cross-sectional area of the channel.

An igniter 40 activated blocking device 10 blocks a fluid line 4 adapted to carry fluid. The blocking device 10 has a housing 30 disposed about the fluid line, a piston 20 housed in the housing, and an igniter 40 that when activated propels the piston 20 to block the fluid line 4. The igniter 40 generates a shock wave to move the piston 20 to block the line. The piston 20 crushes or squeezes a portion of the line 4 to close the line.

A valve features an outer housing, in which there are provided inlet and outlet channels respectively reaching into the housing from inlet and outlet openings thereof. The two channels are axially closed at adjacent inner ends thereof, but feature perforated circumferential walls. A resiliently expandable sleeve is disposed around the circumferential walls in a position normally overlying the perforations, while leaving a gap between the sleeve and inner surfaces of the housing. A charging port communicates with the gap to enable pressurization thereof. Pressurization of the gap normally holds the sleeve tightly over the perforations to prevent flow from one channel to the other. When pressure in the inlet channel exceeds the pressure in the charging chamber, the sleeve radially expands from the circumferential walls of the channels to uncover the perforations and allow fluid to flow between the channels.

The invention relates to a pinch valve comprising at least a body having connecting flanges, a sleeve made of elastic material and an actuator, wherein said pinch valve comprises first pinching means that is movable towards the sleeve, wherein as a response to an operation of the actuator, said first pinching means squeezes the sleeve at least partially to control a flow in said sleeve. In the pinch valve, the sleeve is curved, and said connecting flanges are not parallel, whereupon said sleeve is fixed to the body in such a manner that openings of said sleeve are not parallel either.

A multiple stage pinch valve generally includes a pinch valve body, a manifold top head connected to a proximal end of the pinch valve body and a nozzle head connected to a distal end of the pinch valve body. In one embodiment, the pinch valve body includes a first pinch valve section and a second pinch valve section disposed downstream of the first pinch valve section. In another embodiment, the pinch valve body includes an inner pinch valve section and an outer pinch valve section disposed coaxially around the inner pinch valve section.