A valve timing control device for an internal combustion engine, the valve timing control device includes: a housing; a vane rotor; a lock hole; a lock member; an urging member; a connection passage provided to the vane rotor, and connected to the bolt insertion hole and the back pressure chamber; and an annular passage which is formed between an inner circumference surface of the bolt insertion hole, and an outer circumference surface of a shaft portion of the cam bolt, and which includes one end portion connected to the connection passage, and the other end portion connected to a drain hole formed in the cam shaft.

A spool valve unit includes a sleeve member having a high-pressure port and a low-pressure port, a spool member movably accommodated in the sleeve member in an axial direction, and a spring member for biasing the spool member in a first axial direction. The spool valve unit produces an intermediate fluid pressure to be outputted to an outside of the spool valve unit, when electromagnetic force is applied to the spool member so that the spool member is moved at a high speed between the high-pressure port and the low-pressure port. The spring member is composed of a non-linear spring, a biasing force of which is non-linearly changed with respect to a displacement of the spool member.

The invention is directed to a valve actuating device comprising a body with a bore and a bottom, an actuating element sealingly housed in the bore of the body and forming a first chamber with the body, a piston sealingly extending through a bore in the actuating element, the piston and bore delimiting a second actuating chamber, a passage for an auxiliary fluid between the first and second chambers so that a movement of the piston in the bore of the actuating member can increase the pressure in the first chamber and move the actuating element. The fluid passage comprises a restriction and a check-valve, both arranged in parallel, so as to limit the flow of the auxiliary fluid from the second chamber to the first chamber.

The invention is directed to a valve actuating device comprising a body with a bore and a bottom, an actuating element sealingly housed in the bore of the body and forming a first chamber with the body, a piston sealingly extending through a bore in the actuating element, the piston and bore delimiting a second actuating chamber, a passage for an auxiliary fluid between the first and second chambers so that a movement of the piston in the bore of the actuating member can increase the pressure in the first chamber and move the actuating element. The fluid passage comprises a restriction and a check-valve, both arranged in parallel, so as to limit the flow of the auxiliary fluid from the second chamber to the first chamber.

A method for actuating a solenoid valve, which is loaded with a pneumatic pressure medium, in order to reduce a pressure (p.sub.sys) which is applied to the solenoid valve, where the solenoid valve assumes a closed switching position in the deenergized state and assumes a completely open switching position when it is energized with a switching current intensity (I.sub.s(p)) which is dependent on the applied pressure (p.sub.sys), where a first rise current final value (I.sub.1) is predetermined, which first rise current final value is smaller than the switching current intensity (I.sub.s(p)), where the solenoid valve is energized with an actuating current which follows an actuating current profile (SV1, SV2), and where the actuating current profile (SV1, SV2) comprises a first rise phase (TA1), in which the actuating current is increased to the predetermined first rise current final value (I.sub.1), and, following said first rise phase, a first holding phase (TH1) in which the actuating current is held constant at the first rise current final value (I.sub.1).

A method for actuating a solenoid valve, which is loaded with a pneumatic pressure medium, in order to reduce a pressure (p.sub.sys) which is applied to the solenoid valve, where the solenoid valve assumes a closed switching position in the deenergized state and assumes a completely open switching position when it is energized with a switching current intensity (I.sub.s(p)) which is dependent on the applied pressure (p.sub.sys), where a first rise current final value (I.sub.1) is predetermined, which first rise current final value is smaller than the switching current intensity (I.sub.s(p)), where the solenoid valve is energized with an actuating current which follows an actuating current profile (SV1, SV2), and where the actuating current profile (SV1, SV2) comprises a first rise phase (TA1), in which the actuating current is increased to the predetermined first rise current final value (I.sub.1), and, following said first rise phase, a first holding phase (TH1) in which the actuating current is held constant at the first rise current final value (I.sub.1).

A valve device is provided that is capable of mounting of various electronic devices, and includes a gas-driven type power generation function to solve problems involving wiring or battery-replacement. The problem is solved by a valve device including a piston member that drives a diaphragm, an actuator part that receives supply of a driver gas and drives the piston member, a coil spring that presses the piston member, and a power generation unit that includes a coil provided to a movable part that moves in association with activation of the actuator part, and a permanent magnet provided to a fixed part that docs not move regardless of activation of the actuator part.

The present invention refers to a fluid-conducting pipe of a reciprocating compressor made of polymeric material, and further including at least one vibrational energy dissipation element, basically, aiming at solving the problem of noise and the breakage of the pipe deriving from the resonance of the discharge piping in reciprocating compressors operating at high angular speed regimes.

The present invention refers to a fluid-conducting pipe of a reciprocating compressor made of polymeric material, and further including at least one vibrational energy dissipation element, basically, aiming at solving the problem of noise and the breakage of the pipe deriving from the resonance of the discharge piping in reciprocating compressors operating at high angular speed regimes.

A flow rate trimming device is described comprising a body 12 defining a plurality of convoluted flow passages 22 extending between a first surface 16a of the body and a second surface 16b of the body 12, wherein at the first surface 16a each flow passage 22 defines an opening 24 having a lower edge and an upper edge, at least part of the lower edge of a first one of the openings 24 being at substantially the same level or lower than at least part of the upper edge of a second one of the openings 24, at least part of the upper edge of the first one of the openings 24 being higher than at least part of the upper edge of the second one of the openings 24.