An accumulator assembly includes a vessel having an upper portion and a lower portion. The accumulator assembly includes a flexible membrane extending between the upper portion and the lower portion. The membrane may divide the vessel into a first interior chamber and a second interior chamber. The accumulator assembly includes a receptacle located proximate the vessel. The receptacle may be in fluid communication with the second interior chamber. The accumulator assembly includes a plunger located at least partially within the receptacle.

The present disclosure is an accumulator that has an oil chamber, a first piston separating a first gas chamber from the oil chamber, and a second piston separating a second gas chamber from the oil chamber. The first and second piston are independently movable to alter the volume of the oil chamber.

The invention relates to an accumulator device (10), consisting of at least two accumulator elements (14, 16) which are combined to form a structural unit (12) and have independently from one another their own accumulator characteristic curves (18, 20), in particular as a result of different preload pressures, wherein the respective accumulator characteristic curves (18, 20) provide a combined total accumulator characteristic curve (22), according to which a fluid can be stored in the structural unit (12) and can be retrieved therefrom. The invention further relates to a hydropneumatic suspension system (24) having such an accumulator device (10).

Compositions and methods of preparation and use are provided for an engineered tissue substitute system comprising collagen, glycosaminoglycan and hydrogel in a cross-linked matrix. The compositions may be further lyophilized and reconstituted with a physiological fluid prior to use in methods, such as in the treatment of wounds, tissue engineering and cell transplantation.

Disclosed herein is a three-stage hydraulic actuator. The three-stage hydraulic actuator includes a pressurizing chamber, a distribution chamber and an acceleration chamber. The pressurizing chamber has therein separated spaces respectively charged with compressed gas and compressed oil. The distribution chamber is provided to communicate with the pressurizing chamber and is charged with oil pressurized by the compressed oil charged into the pressurizing chamber. The acceleration chamber communicates with the distribution chamber through a distributing orifice. An acceleration piston is installed in the acceleration chamber and is moved forward when the pressurized oil is supplied from the distribution chamber to the acceleration chamber.

Example implementations relate to a pressure regulator assembly for a closed fluid loop of a CDU. The pressure regulator assembly has a cylinder having an internal volume, and first and second hollow pistons slidably connected to the cylinder to split the internal volume into a first volume portion having cooling fluid, a second volume portion having driver fluid, and a third volume portion having compressible matter. The first volume portion is fluidically connected to the closed fluid loop. The first hollow piston is reciprocated by the compressible matter to maintain operating pressure of the cooling fluid in the closed fluid loop. The second hollow piston is driven by the driver fluid in response to predefined pressure drop of the cooling fluid during predefined time period, to inject additional cooling fluid from the first volume portion into the closed fluid loop to restore pressure level of cooling fluid to operating pressure.

The present invention is a new and improved bladder for use with a piston accumulator apparatus, system and method of using same that provides a dispersion tube in the bladder to allow to be communicated under a vacuum from the bladder to the accumulator seawater chamber and back again.

A hydraulic actuator includes a piston accommodated to slide hermetically in a hollow cylinder to divide the internal volume of the hollow cylinder into two chambers. The hydraulic actuator includes a first movable element accommodated so that it can slide hermetically in a longitudinal cavity defined inside the piston stem to divide the longitudinal cavity into two portions with the first one connected to one of the two chambers and the second one connectable to a second circuit adapted to feed under pressure a second fluid into the second portion. The second fluid has a coefficient of compressibility and a nominal pressure greater than those of the first fluid to act as a shock absorber and/or damper in case of sudden peaks of pressure in the chamber connected to the first portion of the longitudinal cavity defined inside the piston stem.

Presented herein are systems and methods that allow for adapting at least one dimension of an accumulator in a hydraulic system when faced with certain dimensional constraints and to vary the compliance or stiffness of an accumulator.

A high pressure separator/accumulator that uses dual bellows is provided. The dual bellows are not mechanically linked but rather operationally coupled through a fluid medium. The high pressure separators includes a housing defining a first internal space. The housing is in fluid communication with a first fluid system and a second fluid system. A first bellows is coupled to the interior of the separator and defines a space with a variable volume. The space is in fluid communication with the first fluid system. A second bellows is coupled to the interior of the separator, generally opposed to the first bellows, and defines a space with a variable volume. The space is in fluid communication with the second fluid system. The two fluid systems, however, are isolated from each other by the separator. The housing is charged with a fluid medium that transmits force between the first and second bellows.