A large-capacity bag-type constant-pressure accumulator comprises a shell and a bag placed in the shell, as well as a variable area piston, a floating piston, a piston, and a flange. On the piston rod of the variable area piston is mounted the floating piston, while at the bottom of the variable area piston rod is connected the piston. Additionally, through holes are provided on the central axes of the variable area piston and the piston; such holes are connected to the bag through an inflation valve and connected with a cover plate at the bottom. On the piston are arranged the check valves I and check valves II. The flange is connected to the inner wall of the shell bottom.

A pressure accumulator includes an accumulator housing having first and second ports for receiving first and second pressure mediums, respectively, a movable separating element subdividing an interior of the accumulator housing into at least first and second working spaces, the first working space accommodating the first pressure medium and the second working space accommodating the second pressure medium, wherein the first port is in fluid communication with the first working space and the second port in fluid communication with the second working space. At least one sensor is operatively coupled to the first working space for measuring at least one characteristic of the first working space, and a gas generator is operative to generate a gas from ambient air, the gas generator including an outlet for outputting the generated gas, the outlet in fluid communication with the first port. A controller is operatively coupled to the at least one sensor and the gas generator, the controller configured to calculate an amount of gas in the first working space based on the at least one characteristic and upon the calculated amount of gas in the first working space being below a first threshold level, generate a command to introduce gas from the gas generator into the first working space.

A bladder and attachment member assembly for use with a container comprises an elastomeric gas-filled bladder comprising a valve stem. A first attachment member is disposed over the valve stem within the container with the bladder. A second attachment member is disposed over the valve stem and over the first attachment member. The second attachment member is outside of the container interposed between the valve stem and a container opening. Rotational movement of the valve stem is fixed relative to one or both of the first and second attachment members. In an example, the valve stem comprises one or more surface features that register with one or more surface features of the first and/or second attachment member to thereby fix relative valve stem rotational movement. In an example, the valve stem surface feature is a flat surface that registers with a flat surface of the second attachment member inside diameter.

The present disclosure is an accumulator that has an oil chamber, a first piston separating a first gas chamber from the oil chamber, a second piston separating a second gas chamber from the oil chamber, and a compressible member positioned between the second piston and a stop. The compressible member is configured to dampen motion of the second piston towards the stop.

A fluid pump inlet stabilizer dampener includes a deformable diaphragm separating an enclosure into a gas chamber and a liquid chamber; and a piston coupled to the deformable diaphragm and being movable with respect to a valve housing, wherein the piston is configured to be positioned in at least first, second, and third positions, wherein in the first position a first fluid flow path from a pressurized gas inlet port to the gas chamber is open, in the second position the first fluid flow path is closed, and in the third position the first fluid flow path is closed and a second fluid flow path that activates a venturi vacuum generator is open.

A pressure accumulator includes an accumulator housing having first and second ports for receiving first and second pressure mediums, respectively, a movable separating element subdividing an interior of the accumulator housing into at least first and second working spaces, the first working space accommodating the first pressure medium and the second working space accommodating the second pressure medium, wherein the first port is in fluid communication with the first working space and the second port in fluid communication with the second working space. At least one sensor is operatively coupled to the first working space for measuring at least one characteristic of the first working space, and a gas generator is operative to generate a gas from ambient air, the gas generator including an outlet for outputting the generated gas, the outlet in fluid communication with the first port. A controller is operatively coupled to the at least one sensor and the gas generator, the controller configured to calculate an amount of gas in the first working space based on the at least one characteristic and upon the calculated amount of gas in the first working space being below a first threshold level, generate a command to introduce gas from the gas generator into the first working space.

A barrier system for a dual mechanical seal, the system comprising means for controlling barrier fluid pressure relative to product pressure. The pressure control means comprises means for monitoring the volume of barrier fluid in the system and for supplying additional fluid to the system to maintain the volume within a desired range. The system further comprises means for maintaining the barrier fluid pressure at a pre-determined pressure above product pressure.

An accumulator is provided with a communication passage which allows communication between a space inside a gas filling opening and a gas filled chamber in a state where a diaphragm contacts an opening peripheral edge of the gas filling opening and which is formed by, for example, uneven shapes provided in either or both of the diaphragm or/and the opening peripheral edge of the gas filling opening.

A hydraulic drive unit includes: a pump; a pair of supply-discharge lines; a valve block; a sealed tank; a suction line that leads hydraulic oil in the sealed tank to the pump; a connecting line that connects an air vent port of the pump to the suction line; and a gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other. The pump is disposed upward of the valve block and the sealed tank in a vertical direction.

A hydraulic actuator including a barrel, a plunger piston, and a loose piston. The plunger piston is arranged inside the barrel and at a first axial end thereof includes a piston end element. The loose piston is arranged within the barrel, thereby partitioning the interior of the barrel into a first compartment and a second compartment. The piston end element partitions the interior of the barrel into a second and a third compartment. The hydraulic actuator includes a first opening for providing a hydraulic pressure into the first compartment, and a second opening for providing a hydraulic pressure into the second compartment or into the third compartment. The hydraulic actuator is configured such that the second compartment is in fluid connection with the third compartment.