摘要:
In a fuel pump and method of operation, an infeed for low pressure fuel leads to a pumping chamber where in an intake phase low pressure fuel is drawn into the pumping chamber and in a pumping phase high pressure fuel is delivered to a common rail. An inlet metering valve and an inlet check valve are upstream of the pumping chamber, and a control system closes the metering valve when no fuel is to be pumped to the common rail. The inlet check valve is also opened while the inlet metering valve is closed and no fuel is to be pumped to the rail. The inlet metering valve can include a proportionally controlled piston that produces a variable quantity of feed fuel and is closable for the no-demand condition with a maximum travel that contacts and holds open the inlet check valve.
摘要:
The present invention refers to a method for actuating semi-controlled valve that acts in synchronism with the compression cycles of an alternative compressor and to a system for actuating a multi-suction alternative compressor semi-controlled valve. Said method comprises at least a step of detecting at least one compression peak (1) in the course of at least one mechanical cycle (2) of the alternative compressor; and at least a step of switching the functional status of at least an alternative compressor semi-controlled valve (3) based on detecting at least one compression peak (1) in the course of at least one mechanical cycle (2) of the alternative compressor (5).
摘要:
A fluid machine is provided with a housing (23) and a valve block (38). The valve block includes: a valve-block high pressure port (40); a valve-block high pressure passage (42) extending in the valve block to connect the valve-block high pressure port (40) and the working chamber (24) via the high pressure valve (28); a valve-block low pressure port (44); and a valve-block low pressure passage (46) extending in the valve block to connect the valve-block low pressure port (44) and the working chamber (24) via the low pressure valve (30). The housing (23) includes: a housing high pressure port (48) connected to the valve-block high pressure port (40); a housing high pressure passage (50) extending in the housing from the housing high pressure port (48); a housing low pressure port (52) connected to the valve-block low pressure port (44); and a housing low pressure passage (54) extending in the housing from the housing low pressure port (52).
摘要:
A differential pressure control valve has a valve seat, a valve body, and a guiding member. A valve hole through which fluid passes is formed in the valve seat. The valve body is located on the downstream side of the valve seat, and separates from or is seated on the valve seat in accordance with the pressure difference between the upstream side and the downstream side to selectively open and close the valve hole. The guiding member is fixed to the valve seat to guide the valve body. The valve seat is made of magnetic material. The valve body has a lid made of magnetic material and a guided member made of nonmagnetic material. The lid is seated on the valve seat to close the valve hole, and the guided member is guided by the guiding member. One of the valve seat and the lid has a permanent magnet. The valve body is urged in the direction approaching the valve seat by the magnetic pulling force of the permanent magnet. The permanent magnet is located at a position outside the area in which the valve body is seated on the valve seat.
摘要:
The invention relates to a valve actuator (1, 22, 29, 35), comprising at least one driving means (2, 3, 4, 14, 23, 36) for driving a valve (8) to be actuated by said valve actuator (1, 22, 29, 35), at least one triggering unit (2, 3, 27, 32) for triggering a movement of said driving means (2, 3, 4, 14, 23, 36) to open and/or to close said valve (8), wherein said triggering unit (2, 3, 27, 32) is a directly driven triggering unit (2, 3, 27, 32), converting an input signal directly into a triggering signal of said triggering unit (2, 3, 27, 32). Additionally at least one mechanical energy storing unit (4, 14) is provided.
摘要:
The invention relates to a fluid distribution valve (1, 25, 29, 37, 43), comprising at least a first fluid port (2), a second fluid port (3) and a third fluid port (4). These ports are connecting to a fluid distribution chamber (5). The second fluid port (3) can be selectively connected to the first fluid port (2) and/or the third fluid port (4) through said distribution chamber (5). The second fluid port (3) is arranged between the first fluid port (2) and the third fluid port (4).
摘要:
A fluid-working machine has a plurality of working chambers, e.g. cylinders ( 11 ), of cyclically changing volume, a high-pressure fluid manifold ( 14 ) and a low-pressure fluid manifold ( 16 ), at least one valve ( 13, 15 ) linking each working chamber to each manifold, and electronic sequencing means ( 20 ) for operating said valves in timed relationship with the changing volume of each chamber ( 11 ), wherein the electronic sequencing means is arranged to operate the valves of each chamber in one of an idling mode, a partial mode in which only part of the usable volume of the chamber is used, and a full mode in which all of the usable volume of the chamber ( 11 ) is used, and the electronic sequencing means ( 20 ) is arranged to select the mode of each chamber on successive cycles so as to infinitely vary the time averaged effective flow rate of fluid through the machine.