Disclosed is an aquarium ornamental device. An aquarium ornamental device comprises a compressor configured for compressing inlet air, a multiport valve that is electromechanical or mechanically actuated, a plurality of pipes, and an expandable-and-shrinkable member having at least one one-way valve; the compressor, the multiport valve, and the expandable-and-shrinkable member are connected one another in sequence by means of the pipes; the compressor and the multiport valve are placed outside the aquarium, and the expandable-and-shrinkable member having the one-way valve is placed in the water contained within the aquarium.

An air compressor includes a cylinder being fitted with a piston body and an air storage container formed integrally with the cylinder The air storage container defines therein an air chamber having a diameter greater than or equal to the inner space of the cylinder A pressure relieving mechanism is directly mounted to the air storage container rather than at one outlet provided at the air storage container, wherein one portion of the pressure relieving mechanism is located in the air chamber of the air storage container while the other portion of the pressure relieving mechanism extends out of the air storage container to be in contact with a push button provided on an external enclosure, whereby a user may depress the push button to reduce the air pressure within the air storage container.

An air compressor includes a cylinder being fitted with a piston body and an air storage container formed integrally with the cylinder The air storage container defines therein an air chamber having a diameter greater than or equal to the inner space of the cylinder A pressure relieving mechanism is directly mounted to the air storage container rather than at one outlet provided at the air storage container, wherein one portion of the pressure relieving mechanism is located in the air chamber of the air storage container while the other portion of the pressure relieving mechanism extends out of the air storage container to be in contact with a push button provided on an external enclosure, whereby a user may depress the push button to reduce the air pressure within the air storage container.

A hydraulically operated compressor has a fixed piston and a fixed compression or outer cylinder. A drive or intermediate cylinder is located between the piston and outer cylinder. A compression chamber is formed between the drive cylinder and the outer cylinder. Drive fluid is pumped into and released from an interior chamber in the drive cylinder to reciprocate the drive cylinder. The drive fluid also provides cooling to the interior of the compressor.

A hydraulically operated compressor has a fixed piston and a fixed compression or outer cylinder. A drive or intermediate cylinder is located between the piston and outer cylinder. A compression chamber is formed between the drive cylinder and the outer cylinder. Drive fluid is pumped into and released from an interior chamber in the drive cylinder to reciprocate the drive cylinder. The drive fluid also provides cooling to the interior of the compressor.

A reciprocating compressor includes a cylinder including a cylindrical cylinder portion and a cylinder head portion provided on one side of the cylinder portion, and a piston mechanism reciprocably fittedly inserted on an inner peripheral side of the cylinder portion and including a piston defining a compression chamber and a non-compression chamber. A bottomed hole-shaped valve body housing portion is formed at the cylinder head portion. The valve body housing portion is opened to a piston side facing the piston in an axial direction of the cylinder portion. Further, a discharge valve unit and a valve holding member are provided in the valve body housing portion. The discharge valve unit is inserted in the valve body housing portion. The valve holding member holds the discharge valve unit in the valve body housing portion, and includes a communication hole establishing communication between the valve body housing portion and the compression chamber.

A reciprocating compressor includes a cylinder including a cylindrical cylinder portion and a cylinder head portion provided on one side of the cylinder portion, and a piston mechanism reciprocably fittedly inserted on an inner peripheral side of the cylinder portion and including a piston defining a compression chamber and a non-compression chamber. A bottomed hole-shaped valve body housing portion is formed at the cylinder head portion. The valve body housing portion is opened to a piston side facing the piston in an axial direction of the cylinder portion. Further, a discharge valve unit and a valve holding member are provided in the valve body housing portion. The discharge valve unit is inserted in the valve body housing portion. The valve holding member holds the discharge valve unit in the valve body housing portion, and includes a communication hole establishing communication between the valve body housing portion and the compression chamber.

A process for internally cooling an inline compressor comprises the steps of providing a compression chamber between an outer cylinder and an intermediate cylinder and a drive chamber between the intermediate cylinder and a piston; admitting gas into the compression chamber; pumping drive fluid through the piston into the drive chamber to extend the intermediate cylinder and compress the compression chamber and the gas in the compression chamber; allowing heat from the compressed gas to transfer to the drive fluid; allowing the compressed gas to exit the compression chamber; allowing the withdrawal of the drive fluid from the drive chamber; passing the withdrawn drive fluid through a heat exchanger to cool the drive fluid for reuse in extending the intermediate cylinder.

This disclosure includes subsea pumping apparatuses and related methods. Some apparatuses include one or more subsea pumps, each having an inlet and an outlet, and one or more motors, each configured to actuate at least one pump to communicate a hydraulic fluid from the inlet to the outlet, where the subsea pumping apparatus is configured to be in fluid communication with a hydraulically actuated device of a blowout preventer. Some subsea pumping apparatuses include one or more of: a desalination system configured to produce at least a portion of the hydraulic fluid; one or more valves, each configured to selectively route hydraulic fluid from an outlet of a pump to, for example, a subsea environment, a reservoir, and/or the inlet of the pump; and a reservoir configured to store at least a portion of the hydraulic fluid. Some apparatuses are configured to be directly coupled to the hydraulically actuated device.

This disclosure includes subsea pumping apparatuses and related methods. Some apparatuses include one or more subsea pumps, each having an inlet and an outlet, and one or more motors, each configured to actuate at least one pump to communicate a hydraulic fluid from the inlet to the outlet, where the subsea pumping apparatus is configured to be in fluid communication with a hydraulically actuated device of a blowout preventer. Some subsea pumping apparatuses include one or more of: a desalination system configured to produce at least a portion of the hydraulic fluid; one or more valves, each configured to selectively route hydraulic fluid from an outlet of a pump to, for example, a subsea environment, a reservoir, and/or the inlet of the pump; and a reservoir configured to store at least a portion of the hydraulic fluid. Some apparatuses are configured to be directly coupled to the hydraulically actuated device.