A multi-fuel switching device, including a gas part, is provided. The gas part includes a switching valve. The switching valve includes a housing having an air inlet and an air outlet. An internal rotation of the housing is provided with a valve core located between the air inlet and the air outlet. The valve core is provided with a first airway and a second airway. Cross-sectional sizes of the first airway and the second airway are different. The first airway or the second airway is selected through rotating the valve core to connect the air inlet and the air outlet. The solution solves the issue that a fuel switching device in the prior art cannot adapt to three or more fuels, which causes an internal combustion engine to be unable to maintain the optimal working state.

Systems and methods for optimizing the application of pulse width modulation (PWM) in a voltage signal for delivering a current in a valve used to alternatively deliver pressurized gas to and vent from chambers in a vitrectomy probe used to drive a cutter.

A valve base 15 has: a valve base main body 20 on which a connector accommodating portion 37 and a board installing hole 38 are formed; a board assembly 42 provided with a plurality of output terminals and a plurality of input terminals connected to the output terminals by output wirings, and attached to the board installing hole 38; a relay connector 41 provided with a solenoid-side connection portion connected to a solenoid terminal and a board-side connection portion connected to the output terminals, and attached to the connector accommodating portion 37; and a through hole 55 provided on the valve base main body 20 so as to communicate with the connector accommodating portion 37, and exteriorly exposing a part of the relay connector 41. A manifold electromagnetic valve is formed by striking the valve bases 15 against each other. A type of solenoid valve is indicated by the relay connector 41 attached to the valve base 15.

Systems and methods for optimizing the application of pulse width modulation (PWM) in a voltage signal for delivering a current in a valve used to alternatively deliver pressurized gas to and vent from chambers in a vitrectomy probe used to drive a cutter.

A three way valve adapted to be connected to a water purifier includes a body, an inlet defined in the body for communication with a water source, a first outlet defined in the body to constantly communicate with the inlet, a waterway defined inside the body and between the inlet and the first outlet to communicate the inlet and the first outlet and a second outlet selectively communicating with the waterway. A solenoid valve is mounted to control the communication between the second outlet and the waterway so that pollutant screened by a filtering screen is flushed out from the outlet whenever water is flowing from the inlet to the outlet.

This invention relates to a four-state adjustable air path structure. An air source is connected to an air storage tank and a first two-position three-way solenoid valve via a check valve. The first two-position three-way solenoid valve is connected to a second two-position three-way solenoid valve and a vent hole. The second two-position three-way solenoid is connected to a third two-position three-way solenoid valve and a port of a throttle valve. Another port of the throttle valve is connected to the third two-position three-way solenoid valve. The third two-position three-way solenoid valve is connected to an air tank. The present four-state adjustable air path structure simplifies processing and maintenance of a mechanical structure. Intellectual control of an operating speed can also be achieved. The present invention has advantages such as structural simplicity, low manufacturing costs, safe and reliable operation, long service life, and suitability for long-distance transmission.

A water supply apparatus for the supply of water to a machine tool, including a water pump, a water accumulator device, a suction line, a supply line and a valve device reversibly adjustable into a first and a second position. The water pump is positioned downstream of the valve device. A first connecting line, a second connecting line and a return line are provided. Here, in the first position, the first connecting line, the second connecting line and the return line are connected to one another such that water can be conveyed from the water pump, from the first connecting line, from the second connecting line, from at least a part of the suction line and from at least a part of the supply line into the return line, and, in the second position, the first connecting line, the second connecting line and the return line are not connected to one another.

A control valve according to an exemplary embodiment includes an interlocking mechanism that achieves a first operation and a second operation simultaneously or continuously. In the first operation, a sub-valve is opened by having an actuating rod displaced integrally with a sub-valve element in accordance with the magnitude of solenoidal force. In the second operation, a load, by which to bias a main valve element in a closing direction of a main valve, is increased by displacing the actuating rod relative to the main valve element.

A transducer for a connection to a fluid pressure source having a mechanism for setting a pneumatic output by way of an electrical input signal. The transducer provides a lower housing assembly and an upper housing assembly. The lower housing assembly comprises lower housing configured to receive a supply nozzle. The supply nozzle fluidly communicates with a supply port and intermittently fluidly communicates with an output port of the lower housing through an internal fluid passageway. The lower housing further comprises an exhaust nozzle fluidly communicating with an exhaust port and intermittently fluidly communicates with the output port of the lower housing through the internal fluid passageway. The upper housing assembly comprises an upper housing configured to receive a coil and an armature such that the upper housing, coil and armature define a latching electromagnetic circuit that provides alternating contact of the armature with the supply nozzle and the exhaust nozzle of the lower housing assembly.

An outlet device includes an electronic outlet and mechanical outlet two modes. The outlet device has a mechanical outlet control device, an electronic outlet control device and a central control module; the central control module comprises a first outlet passage controlled by the mechanical outlet control device, a second outlet passage controlled by the electronic outlet control device and a central controller; the first outlet passage is disposed with a sensor, the second outlet passage is disposed with an electromagnet valve; when the mechanical outlet control device controls the first outlet passage to open, the sensor detects water flowing in the first outlet passage, whether the electromagnet valve opens or not, the central controller switches the electromagnet valve to normal close state.