A petroleum pipeline safety system for preventing contamination of an environmentally sensitive area close to a pipeline is provided. The system includes a first portion of the pipeline including an upstream portion of the pipeline supplying a flow of fluid material and a flow restriction downstream of the first portion of the pipeline. The system further includes a second portion of the pipeline downstream of the flow restriction, receiving the flow of fluid material from the first portion and conveying the flow of fluid material through the environmentally sensitive area to a downstream portion of the pipeline. The flow restriction is configured to create a lower pipeline internal pressure within the second portion as compared to a pipeline internal pressure within the first portion. The system further includes a third portion of the pipeline downstream of the environmentally sensitive area and including the downstream portion of the pipeline.

A petroleum pipeline safety system for preventing contamination of an environmentally sensitive area close to a pipeline is provided. The system includes a first portion of the pipeline including an upstream portion of the pipeline supplying a flow of fluid material and a flow restriction downstream of the first portion of the pipeline. The system further includes a second portion of the pipeline downstream of the flow restriction, receiving the flow of fluid material from the first portion and conveying the flow of fluid material through the environmentally sensitive area to a downstream portion of the pipeline. The flow restriction is configured to create a lower pipeline internal pressure within the second portion as compared to a pipeline internal pressure within the first portion. The system further includes a third portion of the pipeline downstream of the environmentally sensitive area and including the downstream portion of the pipeline.

A pressure regulating valve assembly includes: a valve having an upstream side receiving an input flow and a downstream side providing an output flow, an actuator for opening and closing the valve, including partially opening the valve, and a regulator controlling the actuator to open, close or partially open the valve. The regulator includes a sense pressure port, wherein pressure at the port is maintained constant by the regulator. A chamber has a first entry orifice, a second entry orifice and an exit orifice. The first entry orifice is connected to the upstream side, the second entry orifice is connected to the downstream side, and the exit orifice is connected to the port. The exit orifice provides that the pressure at the exit orifice lies between the pressure at the first entry orifice and the pressure at the second entry orifice.

A pressure regulating valve assembly includes: a valve having an upstream side receiving an input flow and a downstream side providing an output flow, an actuator for opening and closing the valve, including partially opening the valve, and a regulator controlling the actuator to open, close or partially open the valve. The regulator includes a sense pressure port, wherein pressure at the port is maintained constant by the regulator. A chamber has a first entry orifice, a second entry orifice and an exit orifice. The first entry orifice is connected to the upstream side, the second entry orifice is connected to the downstream side, and the exit orifice is connected to the port. The exit orifice provides that the pressure at the exit orifice lies between the pressure at the first entry orifice and the pressure at the second entry orifice.

A valve comprises a housing having a main inlet, a detection port and an outlet, each providing a channel extending from an exterior of the valve into a hollow interior defined in part by the housing. The inlet is arranged, in use, to be in fluid communication with the interior of a pressurised cylinder of extinguishant fluid. The detection port is arranged, in use, to be in fluid communication with a fire detection system. The valve has two valve parts which are relatively movable between a first position, a second position and a third position. In the first position, a face seal prevents communication between the high pressure chamber and the low pressure chamber, in the second position, the face seal is in an unsealed position and allows communication between the high pressure chamber and the low pressure chamber, and in the third position, the face seal prevents communication between the high pressure chamber and the low pressure chamber.

A valve comprises a housing having a main inlet, a detection port and an outlet, each providing a channel extending from an exterior of the valve into a hollow interior defined in part by the housing. The inlet is arranged, in use, to be in fluid communication with the interior of a pressurised cylinder of extinguishant fluid. The detection port is arranged, in use, to be in fluid communication with a fire detection system. The valve has two valve parts which are relatively movable between a first position, a second position and a third position. In the first position, a face seal prevents communication between the high pressure chamber and the low pressure chamber, in the second position, the face seal is in an unsealed position and allows communication between the high pressure chamber and the low pressure chamber, and in the third position, the face seal prevents communication between the high pressure chamber and the low pressure chamber.

A pressure relief valve configured to vent a pressurized tank in the event of a fire is provided. The pressure relief valve includes a body, a vent passage, a plug and a latch. The vent passage is disposed through the body. The vent passage can be placed in fluid communication with an internal volume of a tank and with the atmosphere. The plug is moveably mounted in the vent passage. The latch has a blocking member disposed in contact with a control end of the plug in a first configuration and out of contact with the control end in a second configuration. The second configuration allows movement of the plug in the vent passage. One or both of a shape memory alloy wire and a trigger piston is configured to actuate the latch from the first to the second configuration. The shape memory alloy wire is configured to shorten when exposed to a temperature above a threshold temperature. The trigger piston moves, e.g., by a pressurized gas, in a trigger actuation passage to actuate the latch from the first configuration to the second configuration.

A pressure relief valve may comprise a housing, a disk, and a seal. The disk may be configured to deflect relative to the housing. The seal may form a sealing interface with at least one of the housing or disk. The pressure relief valve may be coupled to an inflatable slide or an aspirator.

Systems, devices, and methods of modulating a pressure relief valve are provided. A modulating pilot valve assembly can receive an inlet pressure of an inlet of a pressure relief valve and can receive a dome area pressure of a dome area of the pressure relief valve. The modulating pilot valve assembly and the pressure relief valve can be configured to maintain a leak-tight seal until reaching a pilot valve pressure set point, at which the modulating pilot valve assembly instantly reduces the dome area pressure instantly, via a biasing mechanism of the modulating pilot valve assembly causing the pressure relief valve to initially open and thereafter to progressively reduce the dome area pressure in proportion to an increase in the inlet pressure and to cause the pressure relief valve to open in proportion to the increase in the inlet pressure.

Systems, devices, and methods of modulating a pressure relief valve are provided. A modulating pilot valve assembly can receive an inlet pressure of an inlet of a pressure relief valve and can receive a dome area pressure of a dome area of the pressure relief valve. The modulating pilot valve assembly and the pressure relief valve can be configured to maintain a leak-tight seal until reaching a pilot valve pressure set point, at which the modulating pilot valve assembly instantly reduces the dome area pressure instantly, via a biasing mechanism of the modulating pilot valve assembly causing the pressure relief valve to initially open and thereafter to progressively reduce the dome area pressure in proportion to an increase in the inlet pressure and to cause the pressure relief valve to open in proportion to the increase in the inlet pressure.