The inventive concept provides a flow control system. The flow control system includes a damper provided within the pipe for controlling an opening/closing rate of the pipe by a contraction or an expansion; and a pressure control unit for supplying a gas into the damper or exhausting an inside of the damper, and wherein the pressure control unit includes a pressure control pipe for flowing the gas to/from within the damper through an inlet of the damper.

The present disclosure provides a valve (123), comprising a channel body (1231) defining a bent channel space, an elastically flexible membrane (1233), which separates a control space (Sc) from a flow space (Sf) in the channel space, a control connection (1232), providing a fluid connection to the control space (Sc), The control space (Sc) is provided at a radially outermost portion (Co) of the channel space, as per a channel bending radius (Ro), such that the membrane (1233) is flexible between an open position, whereby a cross section of the flow space (Sf) is substantially that of the channel, and a closed position, whereby the membrane substantially seals against a radially innermost portion (Ci) of the channel, as per the channel bending radius (Ri). Use of the valve in a separator is disclosed, as well as a separator comprising such valve and a method of cleaning a separator body.

A valve for inflating and deflating an inflatable element includes a valve housing fluid connected to the inflatable element, an at least one hole extending through the valve housing and accommodated to let a fluid flow in and out the valve housing for inflating and deflating the inflatable element, and a flap disposed next to the at least one hole inside the valve housing, such that the flap covers the at least one hole and behaves as a flap when inflating the inflatable element. The flap is inflatable and is fluid connected with a nozzle disposed outside the valve housing. The inflatable flap, when inflated, uncovers the at least one hole releasing a fluid flow through the at least one hole for deflating the inflatable element.

A system for storing articles can have at least two operating modes. In the first mode, gases are evacuated from the system whereby the articles are stored at a pressure less than the pressure at the exterior of the system. In the second mode, gases are evacuated while the system is open to the admittance of gases from the exterior of the system whereby the articles are ventilated by the admitted gases. The system also can have a third operating mode wherein both the first and second modes are rendered inoperative. The storage system can function so that when the articles are stored in the first mode, gases are intermittently removed from the system whereby the pressure at which the articles are stored is maintained at less than the pressure at the exterior of the system. The storage system can be located in a refrigeration appliance such as a household refrigerator.

A catheter guide structure is disclosed. Provided are a first guide module provided with an oxygen supply opening, a second guide module connected to the first guide module, and having an internal space that is opened only when the advancement of the catheter into the first guide module is necessary, and a third guide module connected to the second guide module to guide the advancement of the catheter into the first guide module. Accordingly, efficiency is ensured for the process of inserting a catheter in a respiratory system of a patient to suction foreign substances such as sputum present in the respiratory system of the patient assisted by the respirator and the process of removing the catheter such that nursing treatment for the patient can be provided with speed and efficiency. Further, according to the present disclosure, cleaning and sterilization inside and outside the catheter can be performed with ease.

An air spring for a heavy-duty vehicle includes a bellows chamber, a piston chamber, and at least one opening. The piston chamber is operatively connected to the bellows chamber. The at least one opening is in fluid communication with the bellows chamber and the piston chamber to provide fluid communication between the bellows chamber and the piston chamber. An orifice assembly is disposed adjacent the at least one opening for variably changing the size of the opening. The air spring provides damping to the heavy-duty vehicle.

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.

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.

The present disclosure provides a valve (123), comprising a channel body (1231) defining a bent channel space, an elastically flexible membrane (1233), which separates a control space (Sc) from a flow space (Sf) in the channel space, a control connection (1232), providing a fluid connection to the control space (Sc), The control space (Sc) is provided at a radially outermost portion (Co) of the channel space, as per a channel bending radius (Ro), such that the membrane (1233) is flexible between an open position, whereby a cross section of the flow space (Sf) is substantially that of the channel, and a closed position, whereby the membrane substantially seals against a radially innermost portion (Ci) of the channel, as per the channel bending radius (Ri). Use of the valve in a separator is disclosed, as well as a separator comprising such valve and a method of cleaning a separator body.

An inflatable system is described herein, including a body, a top, a bottom, an interior cavity, and a fluid inlet. In one aspect of the present teaching, the top and the bottom are on opposite sides of the body, approximately parallel to one another. The stem opening is located on the top of the body, wherein the stem opening allows the entry of fluid into the interior cavity of the body. The inflatable system is made of a material which allows for stretching when the inflatable system is inflated.