A passive isolation valve equipped with one or more nozzles configured to deliver a flow of gas to an area adjacent the valve seat so as to remove accumulated particulate material from the area of the valve adjacent the valve seat that otherwise may adversely affect closure of the valve in response to an energetic event.

Disclosed is a differential pressure valve comprising: a valve body, the valve body having at least one flow inlet and one flow outlet: at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve; at least one flow passage from the flow inlet to the flow outlet; at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet. The biasing member is a non-linear biasing member.

An oil return mechanism includes a base, a control switch, a first blocking ball mounted in the base, an elastic member mounted between the first blocking ball and the base. The base has a liquid storing cavity, a liquid returning cavity, a communicating cavity, a first communicating opening communicating between the liquid returning cavity and the communicating cavity, and a second communicating opening communicating between the communicating cavity and the liquid storing cavity. The present invention can regulate a speed of a fluid flowing from the liquid returning cavity to the communicating cavity, and has the advantages of simple structure and great reduction of cost.

An oil return mechanism includes a base, a control switch, a first blocking ball mounted in the base, an elastic member mounted between the first blocking ball and the base. The base has a liquid storing cavity, a liquid returning cavity, a communicating cavity, a first communicating opening communicating between the liquid returning cavity and the communicating cavity, and a second communicating opening communicating between the communicating cavity and the liquid storing cavity. The present invention can regulate a speed of a fluid flowing from the liquid returning cavity to the communicating cavity, and has the advantages of simple structure and great reduction of cost.

An actuator of a regulator is provided. The actuator is connected to one end of a valve rod (212/312). The actuator comprises a shell (203/303); a limiting component (205/305), the limiting component (205/305) being disposed on an inner wall of the shell (203/303); a diaphragm assembly (204/304), the diaphragm assembly (204/304) being accommodated in the shell (203/303), and the diaphragm assembly (204/304) being movably sleeved on the valve rod (212/312); and an elastic element (226/326), the elastic element (226/326) being accommodated in the shell (203/303), and the elastic element (226/326) being coupled to the diaphragm assembly (204/304), and being movably sleeved, between the diaphragm assembly (204/304) and a tip of one end of the valve rod (212/312), on the valve rod (212/312) in a compressed mode. An inner diameter of a portion, making contact with the shell (203/303), of the limiting component (205/305) is smaller than an outer diameter of an upper portion of the diaphragm assembly (204/304), and the limiting component (205/305) is located above the diaphragm assembly (204/304). A fluid regulator having the actuator is provided. By means of the actuator, the technical problem that a valve rod, a valve flap and a valve port are deformed and even damaged due to extremely large stress in the regulator is solved, the valve rod, the valve flap and the valve port of a valve element assembly are buffered to a certain extent when bearing extremely large stress, and therefore damage is avoided.

A micro-flow throttling device, comprising: a casing used for assembling; a throttling structure mounted inside the casing to form resistance to control a fluid flow, wherein the throttling structure comprises a first axial hole formed inside a fine threaded rod, a first radial hole is formed on one side of the first axial hole, a fine thread flow channel is mounted on one side of the first radial hole, and a second cavity is formed between the fine thread flow channel and a coarse thread flow channel; a regulating structure mounted on the casing and used for regulating the flow rate of the fluid; and a butt-joint structure mounted on the inner wall of the casing and used for performing disassembly and assembly limiting on the throttling structure.

A micro-flow throttling device, comprising: a casing used for assembling; a throttling structure mounted inside the casing to form resistance to control a fluid flow, wherein the throttling structure comprises a first axial hole formed inside a fine threaded rod, a first radial hole is formed on one side of the first axial hole, a fine thread flow channel is mounted on one side of the first radial hole, and a second cavity is formed between the fine thread flow channel and a coarse thread flow channel; a regulating structure mounted on the casing and used for regulating the flow rate of the fluid; and a butt-joint structure mounted on the inner wall of the casing and used for performing disassembly and assembly limiting on the throttling structure.

A valve arrangement comprising: a valve outlet for communication with a low pressure drain; a valve housing provided with a bore for receiving fuel from an accumulator volume; and a valve member having a closed position in which it engages a valve seating defined by the bore to prevent fuel flow from the accumulator volume to the valve outlet. The valve arrangement further comprises a first restricted flow means for restricting the flow of fuel between the accumulator volume and the valve outlet during a first stage of valve opening movement; a second restricted flow means effective during a second stage of valve opening movement to provide a greater restriction than during the first stage; and a third restricted flow means effective during a third stage of valve opening movement to provide a variable restriction to fuel flow dependent on the extent of opening movement of the valve member.

A pressure measuring system is provided in which a closing element supported in the pressure fitting channel is activated or displaced by a pressure surge or a pressure wave and thereby seals the channel to the measuring element and thus prevents an outflow of the fluid.

A pressure measuring system is provided in which a closing element supported in the pressure fitting channel is activated or displaced by a pressure surge or a pressure wave and thereby seals the channel to the measuring element and thus prevents an outflow of the fluid.