There is provided an attachment device for maintaining positive fluid pressure, the attachment device comprising a body having a fluid outlet port and at least two positive pressure fluid inlet ports; wherein each of the at least two positive pressure fluid inlet ports is connectable to a respective fluid source; wherein each of the at least two positive pressure fluid inlet ports is in fluid communication with the fluid outlet port; wherein each of the at least two positive pressure fluid inlet ports comprises an attachment device mechanism for selectively starting and stopping a flow of fluid from the respective fluid source to the fluid outlet port, and wherein the attachment device mechanism comprises a valve moveable between an open valve position and a closed valve position. An attachment device, connector, and method of using an apparatus suitable for a ventilator is also disclosed.

A first diaphragm and a second diaphragm are disposed between a valve element and a body, a diaphragm chamber is formed between the first diaphragm and the second diaphragm, the first diaphragm separates a valve chamber from the diaphragm chamber, and the second diaphragm separates the diaphragm chamber from a back pressure chamber. The diaphragm chamber communicates with an output port, the valve chamber and the back pressure chamber communicate with an input port. A difference between an effective pressure receiving area of the first diaphragm and an effective pressure receiving area of the second diaphragm is equivalent to a passage area in a valve seat.

A pressure regulator for gas distribution systems includes: a connection body for connection between an upstream pipe and a downstream pipe, the following elements being defined inside the connection body: an inlet duct an outlet duct, a high-pressure chamber connected to the inlet duct, a low-pressure chamber connected to the outlet duct, a passage opening between the high-pressure chamber and the low-pressure chamber, a movable shutter designed to obstruct the passage opening, components for moving the movable shutter in a controlled manner. The components for moving the movable shutter in a controlled manner include: a first main control head fixed to the connection body and configured to operate the movable shutter through a first control rod, a second auxiliary control head configured to operate the movable shutter through a second control rod fixed to the same movable shutter.

A pressure regulator for gas distribution systems includes: a connection body for connection between an upstream pipe and a downstream pipe, the following elements being defined inside the connection body: an inlet duct an outlet duct, a high-pressure chamber connected to the inlet duct, a low-pressure chamber connected to the outlet duct, a passage opening between the high-pressure chamber and the low-pressure chamber, a movable shutter designed to obstruct the passage opening, components for moving the movable shutter in a controlled manner. The components for moving the movable shutter in a controlled manner include: a first main control head fixed to the connection body and configured to operate the movable shutter through a first control rod, a second auxiliary control head configured to operate the movable shutter through a second control rod fixed to the same movable shutter.

A fuel cell arrangement has an anode connected to an H2 inflow and a cathode connected to an O2 inflow. A differential pressure control device is arranged between the H2 inflow and the O2 inflow for controlling a differential pressure between the H2 inflow and the O2 inflow. The differential pressure control device has a fluid connection between the H2 inflow and the O2 inflow, in which a deflectable diaphragm is arranged, to which a pin is coupled, which, when the diaphragm is deflected, opens a valve arranged in the H2 inflow.

The invention relates to a fuel cell arrangement (10) having an anode (26) connected to an H2 inflow (48) and a cathode (30) connected to an O2 inflow (50), wherein a differential pressure control device (52) is arranged between the H2 inflow (48) and the O2 inflow (50) for controlling a differential pressure between the H2 inflow (48) and the O2 inflow (50), the differential pressure control device (52) having a fluid connection (54) between the H2 inflow (48) and the O2 inflow (50) in which a deflectable diaphragm (56) is arranged, to which a pin (64) is coupled which, when the diaphragm (56) is deflected, opens a valve (58) arranged in the H2 inflow (48).

A self-operated regulator can be configured to control a stream of working fluid, such as of a processing plant. The self-operated regulator can include a control valve and a control actuator configured to receive supply energy for the provision of an operating force exclusively from the stream of working fluid and/or from the working fluid for operating the control valve. A magnetic field source can be coupled to the control valve such that the magnetic field source follows the movement of the control valve to determine the movement using, for example, a magnetic sensor. The position of the control valve can be detected based on the determined movement.

An integrated tire inflation valve comprises an inlet configured to receive air from an air tank, a pressure protection assembly configured to control air flow into the tire inflation system when an air pressure reaches a pre-set pressure level, a valve assembly in fluid communication with the pressure protection assembly, a pressure regulator configured to be adjusted to a desired pressure to thereby allow air through the pressure regulator at a desired level, a flow switch configured to selectively allow air therethrough, and an outlet configured to provide air from the flow switch to one or more tires of a vehicle. The inlet, pressure protection assembly, valve assembly, pressure regulator, flow switch, and outlet are all positioned within a single housing.

A self-operated regulator for controlling a stream of working fluid particularly of a processing plant, comprising a control valve and a control actuator configured to receive supply energy for the provision of an operating force exclusively from the stream of working fluid and/or from the working fluid for operating the control valve, characterized by a magnetic field source coupled to the control valve such that it follows the movement of the control valve for determining the movement thereof by means of a magnetic sensor for detection of the position of the control valve.

A fluid regulator assembly for a fluid, such as a gas, includes a housing and a regulator. The housing includes an inlet, an outlet, and a chamber. The regulator is coupled to the housing and includes a control assembly with a plug, a diaphragm, and a control element. The plug is movable relative to the outlet for controlling a flow of fluid through the housing, and the diaphragm controls the plug responsive to a control pressure acting on the diaphragm. The control element is positionable between a first position and a second position for controlling the control pressure acting on the diaphragm, where, in the first position, the control pressure is an outlet pressure downstream from the outlet, and in the second position, the control pressure is at least an inlet pressure upstream from the outlet.