A cryogenic liquid switching system including an electronic control mechanism; a solenoid valve communicatively connected to the electronic control mechanism via an interface cable; a gas input control connected to the solenoid valve; and a pair of pneumatic valve actuators connected to the gas input control via separate isolation tubing components The system also including a pair of valve actuator pins, one each connected to a respective one of the pair of pneumatic valve actuators; a pair of pneumatic valves, one each connected to a respective one of the pair of valve actuator pins; and a cryogenic liquid input in fluid communication with at least a portion of each of the pair of pneumatic valves. The system further including a first cryogenic liquid output in fluid communication with a first of the pair of pneumatic valves; a second cryogenic liquid output in fluid communication with a second of the pair of pneumatic valves; and a temperature probe positioned adjacent to an exit of the cryogenic liquid input to measure the temperature of an incoming cryogenic liquid and send a signal to the electronic control mechanism to open and close the pneumatic valves based at least in part on the temperature of the incoming cryogenic liquid.

A control assembly that is configured to operate large, heavy duty flow controls. The control assembly may include a main support and a thin plate disposed on the main support, the thin plate having four sides forming a mounting surface, the thin plate also having lateral slots that extend lengthwise in a first direction between two of the sides and are arranged so adjacent lateral slots are spaced apart from one another in a second direction perpendicular to the first direction.

An excavator includes: a traveling lower body including left and right crawlers; a revolving upper body on the traveling lower body, to be capable of revolving; hydraulic motors to drive the crawlers; left and right traveling operation device to drive the hydraulic motors; a hydraulic pump to supply hydraulic oil to the hydraulic motors; and a detector to detect states of the traveling operation devices. The excavator causes the detector to detect whether there is a predetermined difference between amounts of operations of the left and right traveling operation devices, and upon detecting the predetermined difference between the amounts of operations of the left and right traveling operation devices, suppresses an amount of change in a command value related to a flow rate of the hydraulic oil discharged by the hydraulic pump.

A redundant accumulator system for delivery of pressurized hydraulic fluid to blowout preventers (BOPs) and other well equipment during coiled tubing and wirelining operations that has sufficient reserve fluid capacity to simultaneously operate a plurality of BOPs and other well equipment and to hold a plurality of BOPs closed in the event of a hydraulic fluid leak, and is appropriately sized for use aboard an offshore vessel or platform or for use in close proximity to an inland wellhead. The accumulator system includes a hydraulic fluid capacity that is at least twice the capacity of the accumulators, a plurality of pneumatically operated pumps in parallel, each having the maximum inlets and outlets for their size to maximize the charging capacity of the accumulator system and allow the system to be charged to operational pressure in less than thirty minutes.

A redundant accumulator system for delivery of pressurized hydraulic fluid to blowout preventers (BOPs) and other well equipment during coiled tubing and wirelining operations that has sufficient reserve fluid capacity to simultaneously operate a plurality of BOPs and other well equipment and to hold a plurality of BOPs closed in the event of a hydraulic fluid leak, and is appropriately sized for use aboard an offshore vessel or platform or for use in close proximity to an inland wellhead. The accumulator system includes a hydraulic fluid capacity that is at least twice the capacity of the accumulators, a plurality of pneumatically operated pumps in parallel, each having the maximum inlets and outlets for their size to maximize the charging capacity of the accumulator system and allow the system to be charged to operational pressure in less than thirty minutes.

A gas and liquid-tight inlet connector to the inner chamber of a mufti-chamber pressure vessel is provided, comprising: a male gland extending through an orifice in the bottom of the flexible wall of the inner chamber and the lower wall of the rigid outer shell of the vessel, the male gland comprising an upper flange permanently, sealingly connected, with the lower surface of the flexible inner wall, so as to form a gas- and liquid-tight seal therewith, and a lower elongated member extending through the outer shell to be sealingly connected with a liquid inlet pipe, permitting liquid flow into the inner chamber, while maintaining the seal between the inner and outer chambers of the tank, thus maintaining pressurization in the outer chamber, as fluid enters the inner chamber, pushing the flexible wall upwardly into the outer chamber.

The present invention in one or more embodiments provides a valve assembly which includes a valve shaft, and a valve head extending from the valve shaft, wherein the valve head defines first and second through-apertures extending along a width direction and a slot extending along a height direction, a longitudinal cross-section of the first and second through-apertures being partially received within the slot.

The present invention in one or more embodiments provides a valve assembly which includes a valve shaft, and a valve head extending from the valve shaft, wherein the valve head defines first and second through-apertures extending along a width direction and a slot extending along a height direction, a longitudinal cross-section of the first and second through-apertures being partially received within the slot.

A flow control device that includes an orifice placed in an opening of a duct. A flexible sheet of material is wrapped around a first duct section to include an extended section which is crimped inwardly around the face of the orifice. A sleeve with tightening straps can be wrapped around the aligned first and second duct sections, with the sections having the orifice positioned between. A bead on the duct sections can assist in orifice positioning, attachment, and sealing. The orifice can also be attached to the duct section using tabs and a retention ring. A duct sleeve is also provided for placement in the opening of a duct. The duct sleeve includes a reception slot that receives an orifice plate that is attached in a secure and sealable manner.

A linear actuator includes a housing and a piston slidably mounted within the housing. The piston has a first portion forming a sliding fit between the piston and the housing, a second portion spaced apart from both the housing and the first portion, and a groove formed between the first and second portions.