An apparatus for continuously controlling fluid flow in a sewer conduit, comprising: a) moisture sensors detecting levels of fluid in this conduit; b) an inflatable bladder, mounted in the sewer conduit for releasably sealing in fluid tight fashion a section of this conduit; a compressed air source for inflating the bladder; and a control box including a CPU sensitive to the moisture sensor(s) and actuating the air compressor responsively to conduit fluid level conditions reaching beyond a preset threshold value. The performance of the apparatus is independent of the speed of fluid flow in the sewer conduit.

In some examples, a device includes a fluidic circuit may be configured to receive a fluidic input (and optionally a fluidic bias) and to provide a fluidic output based on the fluidic input. In some examples, the fluidic output may be a fluidic difference output based on a difference (such as a pressure and/or flow difference) between the fluidic input and a fluidic bias. In some examples, a device includes a fluidic amplifier configured to receive the fluidic difference output, and to provide a device fluidic output based on the fluidic difference output. The device fluidic output may be provided to a fluidic load, which may include an actuator and/or a haptic device.

An example valve includes: a pilot seat member comprising: a channel that is fluidly coupled to a first port of the valve, a pilot seat, and one or more cross-holes fluidly coupled to a second port of the valve; a pilot check member configured to be subjected to a fluid force of fluid in the channel of the pilot seat member acting on the pilot check member in a proximal direction; a solenoid actuator sleeve comprising a chamber; a first setting spring disposed in the chamber and configured to bias the solenoid actuator sleeve in a distal direction; and a second setting spring configured to bias the pilot check member in the distal direction, such that the first setting spring and the second setting spring cooperate to apply a biasing force in the distal direction on the pilot check member toward the pilot seat against the fluid force.

A control valve includes a piston-housing having a hollow portion. The hollow portion has a first end, an open end, first and second internal chambers, and a fluid port configured to allow fluid to exit the second chamber. The first chamber is nearer the first end, and the second chamber is nearer the open end. A piston is located within the housing and is adapted for reciprocal motion. The piston includes a first and second seal-engaging portions. The first seal-engaging portion has a diameter that is less than the diameter of the second seal-engaging portion.

A system for adjusting pressure of a gas includes: a first shutter unit for causing a pressure drop in the gas, from a supply pressure to a delivery pressure; a pilot unit for providing a pilot pressure depending on the difference between the delivery pressure and a predefined setting pressure; a first drive unit operated by the pilot pressure to reduce the opening of the first shutter unit when the delivery pressure exceeds the setting pressure, and vice versa; a second shutter unit in series with the first shutter unit can assume a closed configuration; a second drive unit operated by the pilot pressure to reduce the opening of the second shutter unit when the delivery pressure exceeds the setting pressure, and vice versa. When the first shutter unit is open the opening of the second shutter unit causes a pressure drop smaller than the pressure drop by the first shutter unit.

Various embodiments of the present disclosure provide a pneumatic inflator for automatically inflating inflatable articles, such as dunnage bags, to a desired pressure. Generally, once activated, the pneumatic inflator of the present disclosure inflates an inflatable article via a compressed air source until the air pressure inside the inflatable article reaches an operator-selected desired pressure. Thereafter, the pneumatic inflator automatically stops inflating the inflatable article. In various embodiments, the pneumatic inflator also includes a manual shut-off that, when activated while the pneumatic inflator is inflating the inflatable article, causes the pneumatic inflator to stop inflating the inflatable article. The pneumatic inflator of the present disclosure thus enables automatic inflation of inflatable articles to particular, operated-selected desired pressures with limited operator input.

A pressure regulator has a pressure chamber connected to an inlet flow area which receives liquid flow. As liquid flows into a forward chamber of the pressure chamber, pressure is exerted on the forward face of the piston, which in turn causes the piston to slide longitudinally through the pressure chamber. A bypass fluidically connects the forward pressure chamber and rear pressure chamber such that as the piston slides into the rear pressure chamber pressure increases at the rear pressure chamber, which in turn forces the piston to move forwardly, thus regulating flow out of the pressure chamber. A hand wheel is configured to turn a movable plate located inside the pressure chamber, with the movable plate configured to impede the piston from moving rearwardly. Pressure sensors and vents with a pressurized air source may be used to keep the pressure within a desired range.

Hydraulic drive and method for driving a pressure booster of a high-pressure apparatus. The hydraulic drive includes a pressure medium pump having one of a constant displacement pump and a pump conveying a constant volume per revolution, a servo motor coupled to drive the pump, and a controller structured to at least one of electrically control, regulate and switch the servo motor, which is arranged on at least one of a low pressure side and a high pressure side of the pressure booster.

Systems and methods described herein provide a pilot-operated oscillating valve including a diaphragm. The valve is configured such that when the diaphragm is in a closed position, pressure of a fluid supply opens the valve, and when the diaphragm is in an open position, the pressure of the fluid closes the valve. The oscillating valve may further include an actuator that can cause the valve to be arrested selectively in the open position or the closed position depending on a state of the actuator. The state of the actuator is switchable with a small expenditure of energy, enabling an extended duty cycle for a battery or other power source associated with the actuator. In some implementations, energy from the oscillating movement of the diaphragm may be captured to recharge the battery for the actuator.

A system for adjusting pressure of a gas includes: a first shutter unit for causing a pressure drop in the gas, from a supply pressure to a delivery pressure; a pilot unit for providing a pilot pressure depending on the difference between the delivery pressure and a predefined setting pressure; a first drive unit operated by the pilot pressure to reduce the opening of the first shutter unit when the delivery pressure exceeds the setting pressure, and vice versa; a second shutter unit in series with the first shutter unit can assume a closed configuration; a second drive unit operated by the pilot pressure to reduce the opening of the second shutter unit when the delivery pressure exceeds the setting pressure, and vice versa. When the first shutter unit is open the opening of the second shutter unit causes a pressure drop smaller than the pressure drop by the first shutter unit.