A coupling assembly includes a nipple component and a coupler component that are connectable to each other to form a fluid flow pathway through the coupling assembly. The nipple component includes a nipple body that defines a chamber that receives a first valve and a second valve that are moveable within the chamber, and the first valve and the second valve are spring biased against each other by a spring loaded plunger of the first valve, and a second valve spring that biases the second valve in the closed position. During a connection operation and/or a disconnection operation, a balance of forces including the spring bias, in combination with system pressure, maintains the second valve in a closed position, thereby isolating the fluid flow from an area of the chamber in which components of the first valve reside, including isolating an interface seal from fluid flow.

A valve arrangement for a hose end coupler of a transfer hose for the offloading of hydrocarbons from an offshore floating production storage and offloading vessel (FPSO) to a shuttle tanker is described. The valve arrangement comprises a linear valve comprising a linear valve actuator movable between a first position whereat the valve is closed and a second position whereat the valve is open; a secondary valve comprising a secondary valve actuator movable between a first position whereat the valve is closed and a second position whereat the valve is open; wherein the linear valve actuator and the secondary valve actuator are operatively coupled such that movement of the linear valve actuator between the first position and the second position effects a corresponding movement of the secondary valve actuator between the first position and the second position. A hose end coupler with such a valve arrangement, and a transfer hose and transfer system and method incorporating such a hose end coupler with such a valve arrangement are also described.

A connector system for use during hydraulic fracturing operations includes a first connector having a bore and an annular interface defined by a plurality of surfaces disposed at selected angles with respect to each other. A second connector has an annular interface defined by a plurality of surfaces disposed at selected angles to each other. The plurality of surfaces of the annular interface of the first connector are adapted to engage the plurality of surfaces of the annular interface of the second connector to form a seal.

A connector system for use during hydraulic fracturing operations includes a first connector having a bore and an annular interface defined by a plurality of surfaces disposed at selected angles with respect to each other. A second connector has an annular interface defined by a plurality of surfaces disposed at selected angles to each other. The plurality of surfaces of the annular interface of the first connector are adapted to engage the plurality of surfaces of the annular interface of the second connector to form a seal.

A coupler for coupling an attachment to an excavator or other machine comprises a powered actuator for actuating a locking member into and out of said locking state, a first power coupling unit, and a second actuator for moving the power coupling unit into and out of an engaging position in which it is engagable with a corresponding second power coupling unit of the attachment. The coupler is configured to cause the first power coupling unit to move into the engaging position after said latching member adopts the locking state and, when decoupling the attachment from the coupler, to cause said latching member to remain in its locking state until after the first power coupling unit is moved out of its engaging position.

An arrangement for releasing a coupling connection of a hydraulic quick coupler includes a hydraulic coupling for receiving a hydraulic plug. The hydraulic coupling has a coupler housing and a coupler cartridge displaceably mounted therein such that when the hydraulic plug is pushed in, the coupler cartridge adopts an operating position locking the hydraulic coupling. The arrangement also includes an actuating arrangement. The coupler cartridge is movable via the actuating arrangement from the operating position to an ejection position for releasing the hydraulic plug. The coupler cartridge is actuated by an external force operably controlled by a control arrangement.

An arrangement for releasing a coupling connection of a hydraulic quick coupler includes a hydraulic coupling for receiving a hydraulic plug. The hydraulic coupling has a coupler housing and a coupler cartridge displaceably mounted therein such that when the hydraulic plug is pushed in, the coupler cartridge adopts an operating position locking the hydraulic coupling. The arrangement also includes an actuating arrangement. The coupler cartridge is movable via the actuating arrangement from the operating position to an ejection position for releasing the hydraulic plug. The coupler cartridge is actuated by an external force operably controlled by a control arrangement.

A jumper manifold for use in a fracing system including a first outlet interface for coupling to a first outlet line, a second outlet interface for coupling to a second outlet line, and an inlet interface for coupling to an inlet line carrying a slurry under pressure. A jumper, in a first configuration, couples the inlet interface with the first outlet interface for transporting slurry from the inlet line to the first outlet line while isolating the second outlet line. The jumper, in a second configuration, couples the inlet interface with the second outlet interface for transporting slurry from the inlet line to the second outlet line while isolating the first outlet line.

A tensioning cylinder device includes a housing (2), at least partly longitudinally movable piston-rod unit (30, 34) arranged in the housing and a compensating element in the form of a bellows body (18) having bellows folds. The bellows body is longitudinally variable and has a media-carrying connection to a compressible medium accommodated in a medium chamber (12) in the housing (2).

A tensioning cylinder device includes a housing (2), at least partly longitudinally movable piston-rod unit (30, 34) arranged in the housing and a compensating element in the form of a bellows body (18) having bellows folds. The bellows body is longitudinally variable and has a media-carrying connection to a compressible medium accommodated in a medium chamber (12) in the housing (2).