A valve with a shuttle for use in a flow management system is capable of bypassing a backflow.

A fuel tank isolation valve 10, wherein, the shaft 18 is assembled coaxially inside hole 42 of moving plunger 46 of seal sub assembly 16 and then flow limiter 22 is guided over the shaft 18 through guiding hole 34 to maintain sealing seat 36 in parallel with respect to the sealing surface 38 of rubber seal 44 and avoid misalignment of flow limiter 22 with respect to sealing surface 38 during and after the operation; the sealing seat 36 of flow limiter 22 on the sealing surface 38 of the rubber seal 44 fixed into moving plunger 46 of seal sub assembly 16 performs the over pressure relief function; the sealing surface 40 of rubber seal 44 fixed into moving plunger 46 of seal sub-assembly 16 is resting on surface 48 of nozzle body 20 to perform over vacuum relief function; and the rubber seal 44 assist both over pressure relief (OPR) and over vacuum relief (OVR) function.

One embodiment relates to a valve device. The valve device includes: a valve case; a valve element slidably disposed within a valve chamber defined in the valve case; and a positive pressure spring configured to urge the valve element toward a valve seat in the valve case. The valve element includes an outer circumferential portion having a predetermined length extending along an inner circumference of the valve chamber. The outer circumferential portion includes plural opening portions. And, ribs project from the inner circumference of the valve chamber to enter into the opening portions, thereby limiting movement of the positive pressure spring in a radial direction.

One embodiment relates to a valve device. The valve device includes: a valve case; a valve element slidably disposed within a valve chamber defined in the valve case; and a positive pressure spring configured to urge the valve element toward a valve seat in the valve case. The valve element includes an outer circumferential portion having a predetermined length extending along an inner circumference of the valve chamber. The outer circumferential portion includes plural opening portions. And, ribs project from the inner circumference of the valve chamber to enter into the opening portions, thereby limiting movement of the positive pressure spring in a radial direction.

A relief valve comprises a valve body, a pallet assembly, a relief pallet seat, a pilot pallet seat and a force element. The valve body has an interior in fluid communication with a container having a container pressure and the valve body having an exterior exposed to an atmosphere. The pallet assembly has a relief pallet having a relief pressure bearing area, a pilot pallet having a pilot pressure bearing area, and a shaft connects the pilot pallet and relief pallet to space the pilot pallet from the relief pallet. The relief pallet seat extends from the valve body towards the interior of the valve body and is configured to seal against the relief pallet to seal the valve body. The pilot pallet seat extending from the valve body and away from the interior of the valve body and is configured to seal against the pilot pallet to form a reservoir between the pilot pallet, the pilot pallet seat and the valve body. The reservoir has an equalization port to provide fluid communication between the valve body and the reservoir.

A relief valve comprises a valve body, a pallet assembly, a relief pallet seat, a pilot pallet seat and a force element. The valve body has an interior in fluid communication with a container having a container pressure and the valve body having an exterior exposed to an atmosphere. The pallet assembly has a relief pallet having a relief pressure bearing area, a pilot pallet having a pilot pressure bearing area, and a shaft connects the pilot pallet and relief pallet to space the pilot pallet from the relief pallet. The relief pallet seat extends from the valve body towards the interior of the valve body and is configured to seal against the relief pallet to seal the valve body. The pilot pallet seat extending from the valve body and away from the interior of the valve body and is configured to seal against the pilot pallet to form a reservoir between the pilot pallet, the pilot pallet seat and the valve body. The reservoir has an equalization port to provide fluid communication between the valve body and the reservoir.

A loop flushing valve includes a valve body, a fluid passage plug, and a poppet. The valve body includes an internal shoulder and a bore. The fluid passage plug is disposed in the bore and includes a fluid passage in fluid communication with the bore and a system fluid passage. The poppet is captured between the internal shoulder and the fluid passage plug and extends through the valve body.

An air removal assembly can include an air valve mountable on a fluid system; and a throttling device in fluid communication with the air valve, the throttle device further in fluid communication with the fluid system through the air valve when the air valve is mounted on the fluid system, the throttling device including: a body having an inner and outer surface, the inner surface defining a body cavity, the inner and outer surfaces defining a plurality of body orifices in fluid communication through the body cavity; a throttle movably positioned within the body cavity proximate to a first orifice of the plurality of orifices, the throttle movable to a closed position closing the first orifice and to an open position opening a fluid pathway between the first orifice and the body cavity; and a biasing element biasing the throttle to a partially-open position between the closed and open positions.

A pressure equalization valve comprises a first pressure cylinder, a second pressure cylinder, an aperture, and a stationary member. The stationary member is located between the first pressure cylinder and the second pressure cylinder. The second pressure cylinder is located within the aperture. A primary piston is located within the first pressure cylinder and a secondary piston is located within the second pressure cylinder. A stem is directly connected to the aperture and the primary piston. The stem includes a fluid passage between the first pressure cylinder and the second pressure cylinder. When a pressurized fluid is introduced into the first pressure cylinder, the pressurized fluid pushes the primary piston and the stem to open the aperture in a linear direction, the pressurized fluid travels to the second cylinder through the fluid passage and pushes against the aperture in the same direction as said first piston further opening the aperture.

A combination includes a selectively driven fan and a bypass flow passage for bypassing the fan. The bypass flow passage communicates with a first check valve to allow air to flow from the bypass passage to a downstream location. A second check valve allows air driven by the fan to pass into a return passage and return to an inlet of the fan in the event that the discharge pressure from the fan overcomes a spring force associated with the second check valve. A heat exchanger pack and an environmental control system for use on an aircraft, and a method are all also disclosed.