A pressure regulator for a BOP stack includes a housing having an input port, an output port, and a pilot port and a regulator piston axially movable through the housing between an open position and a closed position. The regulator piston has an internal passage formed through its first axial end. When the regulator piston is in the open position, the internal passage is in fluid communication with the input and output ports. When the regulator piston is in the closed position, the internal passage is in fluid communication with the output port and fluidly isolated from the input port. A space with regulator fluid is also provided within the housing adjacent a second axial end of the regulator piston, opposite the first axial end, wherein the space is fluidly isolated from the input port and the output port in both the open position and the closed position.

A pressure regulator includes a housing having an inlet cap with an inlet flow passage and an outlet cap with an outlet flow passage. A plunger is reciprocally mounted in the housing. A stationary regulator valve seat is disposed between the inlet flow passage and an inlet to the plunger. A drain check shuttle is disposed in the inlet cap and positioned downstream of the regulator valve seat to prevent water from draining out of the regulator when an inlet water pressure is below a predetermined threshold.

A pressure regulator includes a housing having an inlet cap with an inlet flow passage and an outlet cap with an outlet flow passage. A plunger is reciprocally mounted in the housing. A stationary regulator valve seat is disposed between the inlet flow passage and an inlet to the plunger. A drain check shuttle is disposed in the inlet cap and positioned downstream of the regulator valve seat to prevent water from draining out of the regulator when an inlet water pressure is below a predetermined threshold.

An apparatus includes a safety shut-off valve for use with a gas regulator. The safety shut-off valve includes a housing, a valve rod, a vent chamber, and a vent line. The housing includes an interior chamber configured to regulated pressure in a fluid. The valve rod is disposed in the housing and controls a valve for interrupting the fluid in the internal chamber. The vent chamber receives ambient air and maintains pressure equalization of the ambient air and the fluid within a maximum pressure of the fluid. The vent line is disposed in a center of the valve rod and provides fluid communication of the ambient air between the vent chamber and an outside of the housing.

An apparatus includes a safety shut-off valve for use with a gas regulator. The safety shut-off valve includes a housing, a valve rod, a vent chamber, and a vent line. The housing includes an interior chamber configured to regulated pressure in a fluid. The valve rod is disposed in the housing and controls a valve for interrupting the fluid in the internal chamber. The vent chamber receives ambient air and maintains pressure equalization of the ambient air and the fluid within a maximum pressure of the fluid. The vent line is disposed in a center of the valve rod and provides fluid communication of the ambient air between the vent chamber and an outside of the housing.

An electronic device and a method are disclosed. The electronic device includes a sensor, a memory, a processor, and a communication interface. The sensor is configured to detected vibrations of a gas pressure regulator. The memory is configured to store the detected vibrations. The processor is configured to record the detected vibrations caused by the gas pressure regulator at a predetermined time interval. The processor is also configured to generate a report of the recorded vibrations caused by the gas pressure regulator to indicate the operational status of the gas pressure regulator, wherein the generated report includes at least two recorded vibrations. The communication interface configured to transmit the generated report.

An electronic device and a method are disclosed. The electronic device includes a sensor, a memory, a processor, and a communication interface. The sensor is configured to detected vibrations of a gas pressure regulator. The memory is configured to store the detected vibrations. The processor is configured to record the detected vibrations caused by the gas pressure regulator at a predetermined time interval. The processor is also configured to generate a report of the recorded vibrations caused by the gas pressure regulator to indicate the operational status of the gas pressure regulator, wherein the generated report includes at least two recorded vibrations. The communication interface configured to transmit the generated report.

A pressure maintenance device includes: a hydraulic device inside a housing of a battery module together with a plurality of battery cells, the hydraulic device being configured to change its volume to offset a pressure change inside the housing due to deformation of the plurality of battery cells; an accumulator connected to the hydraulic device through a pipe, the accumulator being configured to store fluid and to discharge the fluid to the pipe or to store the fluid introduced from the pipe according to a change in a volume of the hydraulic device; a heater configured to heat the accumulator; and a controller configured to control the heater according to an outdoor air temperature.

A pressure maintenance device includes: a hydraulic device inside a housing of a battery module together with a plurality of battery cells, the hydraulic device being configured to change its volume to offset a pressure change inside the housing due to deformation of the plurality of battery cells; an accumulator connected to the hydraulic device through a pipe, the accumulator being configured to store fluid and to discharge the fluid to the pipe or to store the fluid introduced from the pipe according to a change in a volume of the hydraulic device; a heater configured to heat the accumulator; and a controller configured to control the heater according to an outdoor air temperature.

Disclosed is a method for monitoring pressure, for a vessel assembly including a sealed vessel capable of holding a liquid, a filter capable of capturing vapors from the liquid, a pipe connecting the vessel to the filter, and an isolation valve arranged to selectively shut off the pipe, including a detection of the boiling of the liquid contained in the vessel.