An isolation mechanism for isolating a submerged pump in a storage vessel, where the isolation mechanism comprises a primary valve member and a secondary valve member, which are both biased in a fail-closed position. The isolation mechanism allows for redundancy for safety and reliability, and can be operated externally of the storage vessel. Furthermore, the isolation mechanism comprises venting and purging devices for safe operation of removal and installation of the pump in the storage vessel.

A fuel supply system for an internal combustion engine may include a plurality of fuel injection pumps, each fuel injection pump being configured to pressurize fuel and provide the pressurized fuel to an associated fuel injector. The fuel supply system may further include a low-pressure fuel supply line fluidly connected to the plurality of fuel injection pumps and configured to provide fuel from a fuel supply tank to the plurality of fuel injection pumps. The fuel supply system may still further include a low-pressure fuel return line fluidly connected to the plurality of fuel injection pumps and configured to return remaining fuel from the plurality of fuel injection pumps to the fuel supply tank. The fuel supply system may include a first fuel cut-off valve disposed in the low-pressure fuel supply line and configured to stop a flow of fuel from the fuel supply tank to the plurality of fuel injection pumps.

A method of servicing a pressure relief valve system for a fluid injection system is provided. The method includes providing a skid, with the skid having a frame that supports a horizontal I-beam overhead. The method also includes providing a pressure relieve valve (PRV) system supported by a platform of the skid. The PRV system comprises one or more pressure transducers configured to sense fluid pressure within the fluid injection system. The transducers then generate electrical signals representative of fluid pressure readings within the fluid injection system in real time. Signals are received by a controller which compares pressure readings with a stored pressure threshold. An actuation signal is sent upon detecting a signal representative of a pressure that exceeds the stored pressure threshold, causing an electraulically-actuated valve to rotatably move to an open position. Plug valves may be quickly removed for service using a hoist system supported by the skid.

A flow limiting valve, comprising a valve body adjustable between a closed position and an open position, wherein in the open position a flow channel for a conveying fluid is opened in the flow limiting valve and in the closed position the flow channel is closed, whereby the adjustment of the valve body is subject to conveying fluid pressure; wherein a control valve is integrated into a housing of the flow limiting valve through which the valve body is adjustable between open and closed positions, regardless of the conveying fluid.

This fuel pressure accumulating device comprises: a fuel pressure accumulating unit inside which a pressure accumulating space is provided; a fuel inflow unit which is fitted to the fuel pressure accumulating unit and through which fuel can flow into the pressure accumulating space; a fuel outflow unit which is fitted to the fuel pressure accumulating unit and through which the fuel can flow from the pressure accumulating space; and a fuel storage unit which is provided in the fuel pressure accumulating unit, and which stores fuel that has leaked to a position in the fuel pressure accumulating unit where the fuel inflow unit is fitted, and a position in the fuel pressure accumulating unit where the fuel outflow unit is fitted.

The invention relates to a flow restrictor (16) for an injector of a common rail fuel injection system. The flow restrictor (16) has a closure bolt (5) with a high-pressure connection (20), a valve housing (24), a ball (15), and a spring (17). A support seat (28) is formed on the closure bolt (5), and a valve seat is formed on the valve housing (24). The ball (15) is arranged in an axial bore (11a) formed in the valve housing (24) and is acted upon by the spring (17) in the direction of the support seat (28). Upon contacting the support seat (28), the ball (15) releases a hydraulic connection of the high-pressure connection (20) through the axial bore (11a), and upon contacting the valve seat (18), the ball blocks the hydraulic connection. The support seat (28) has an oval contour.

A pressure-limiting valve for a fuel injection system includes a housing having a fluid inlet and a fluid outlet, a sealing seat, and a sealing body configured to move between a closed position in which the sealing body is in contact with the sealing seat, which blocks fluid flow from the fluid inlet to the fluid outlet, and additional positions that permit such fluid flow, and a holding device for keeping the sealing body in one of the additional positions if the sealing body is moved at least a specified distance away from the sealing seat.

A drive device for generating a drive movement includes a consumer, a fuel tank, which is connected to the consumer through a fuel line, and a pneumatically operable emergency shut-off valve in the fuel line. The emergency shut-off valve shuts off the fuel line in a closed position and allows fuel to pass through in an open position. The device provides a greater level of safety, in that the emergency shut-off valve remains in its closed position, or even automatically shifts to the closed position, in the event of defective operation.

The present disclosure relates to a fuel cut apparatus capable of improving air ventilation while blocking moisture from being infiltrated thereinto by selectively opening and closing an air vent corresponding to engine starting and engine stopping. The fuel cut apparatus includes: a housing; a motor installed at one side of the housing; a rotor rotated by the motor of the housing; and a cam member rotating in association with rotation of the rotor to switch on/off a contact switch, wherein one side of the housing is provided with an air vent, and the air vent is opened or closed by the cam member.

The present disclosure relates to a fuel cut apparatus capable of improving air ventilation while blocking moisture from being infiltrated thereinto by selectively opening and closing an air vent corresponding to engine starting and engine stopping. The fuel cut apparatus includes: a housing; a motor installed at one side of the housing; a rotor rotated by the motor of the housing; and a cam member rotating in association with rotation of the rotor to switch on/off a contact switch, wherein one side of the housing is provided with an air vent, and the air vent is opened or closed by the cam member.