Valves for maintaining brake cylinder pressure in freight car brake equipment are provided. A valve includes a first diaphragm defining a first side and a second side, and a second diaphragm defining a first side and a second side. The valve further includes a first port for receiving pressure from one of an emergency reservoir or a control volume, the first port in fluid communication with the first side of the first diaphragm; a second port for receiving pressure from a brake pipe, the second port in fluid communication with the second side of the first diaphragm; and a third port for receiving pressure from a brake cylinder, the third port in fluid communication with the second side of the second diaphragm.

An electronic cigarette includes a power supply device, an atomizer, a liquid storage structure, a fluid transportation device, a casing and a mouthpiece. The atomizer includes an electric heater and a liquid conduit. The electric heater is disposed around liquid conduit. The liquid storage structure includes a liquid container for storing cigarette liquid. The fluid transportation device includes an input channel in communication with the liquid container and an output channel in communication with the liquid conduit. The cigarette liquid is transferred to the liquid conduit through the fluid transportation device at a certain amount. Consequently, an atomized vapor is generated. The casing has an inlet in communication with the atomizer through an airflow chamber. The inlet and the airflow chamber form an airflow path for an airflow to pass through. The mouthpiece is located at an end of the casing and in communication with the airflow path.

An electronic cigarette includes a power supply device, an atomizer, a liquid storage structure, a fluid transportation device, a casing and a mouthpiece. The atomizer includes an electric heater and a liquid conduit. The electric heater is disposed around liquid conduit. The liquid storage structure includes a liquid container for storing cigarette liquid. The fluid transportation device includes an input channel in communication with the liquid container and an output channel in communication with the liquid conduit. The cigarette liquid is transferred to the liquid conduit through the fluid transportation device at a certain amount. Consequently, an atomized vapor is generated. The casing has an inlet in communication with the atomizer through an airflow chamber. The inlet and the airflow chamber form an airflow path for an airflow to pass through. The mouthpiece is located at an end of the casing and in communication with the airflow path.

An electronic cigarette includes a power supply device, an atomizer, a liquid storage structure, a fluid transportation device, a sensing unit, a casing and a mouthpiece. The atomizer includes an electric heater and a liquid conduit. The liquid storage structure includes a liquid container for storing a cigarette liquid. The fluid transportation device is in communication with the liquid container and the liquid conduit. The cigarette liquid is transferred to the liquid conduit through the fluid transportation device. The sensing unit includes an airflow sensor and an air pressure sensor for adjusting the speeds of atomizing the cigarette liquid and providing the cigarette liquid. After an airflow is fed into an entrance of the casing, the airflow passes through an airflow chamber and the sensing unit along an airflow path. The mouthpiece seals an end of the casing and in communication with the airflow path.

An electronic cigarette includes a power supply device, an atomizer, a liquid storage structure, a fluid transportation device, a sensing unit, a casing and a mouthpiece. The atomizer includes an electric heater and a liquid conduit. The liquid storage structure includes a liquid container for storing a cigarette liquid. The fluid transportation device is in communication with the liquid container and the liquid conduit. The cigarette liquid is transferred to the liquid conduit through the fluid transportation device. The sensing unit includes an airflow sensor and an air pressure sensor for adjusting the speeds of atomizing the cigarette liquid and providing the cigarette liquid. After an airflow is fed into an entrance of the casing, the airflow passes through an airflow chamber and the sensing unit along an airflow path. The mouthpiece seals an end of the casing and in communication with the airflow path.

An electronic cigarette includes a power supply device, a sensing unit, an atomizer, a liquid storage structure and a fluid transportation device. The atomizer includes an electric heater and a liquid conduit. The liquid conduit has an input port at one end and plural perforations at the other end, and the electric heater is disposed around the liquid conduit. The liquid storage structure includes a passageway and a liquid container. A cigarette liquid is stored in the liquid container. The fluid transportation device includes an input channel and an output channel. The input channel is in communication with the liquid container. The output channel is in communication with the liquid conduit of the atomizer. The cigarette liquid is transferred to the atomizer at a certain amount. Consequently, an atomized vapor is generated.

An electronic cigarette includes a power supply device, a sensing unit, an atomizer, a liquid storage structure and a fluid transportation device. The atomizer includes an electric heater and a liquid conduit. The liquid conduit has an input port at one end and plural perforations at the other end, and the electric heater is disposed around the liquid conduit. The liquid storage structure includes a passageway and a liquid container. A cigarette liquid is stored in the liquid container. The fluid transportation device includes an input channel and an output channel. The input channel is in communication with the liquid container. The output channel is in communication with the liquid conduit of the atomizer. The cigarette liquid is transferred to the atomizer at a certain amount. Consequently, an atomized vapor is generated.

An electronic cigarette includes a power supply device, an atomizer, a liquid storage structure, a fluid transportation device and a sensing unit. The atomizer includes an electric heater. The liquid storage structure includes a passageway and a liquid container for storing cigarette liquid. The fluid transportation device is in communication with the liquid container and the atomizer for transferring the cigarette liquid to the atomizer at a certain amount. Consequently, an atomized vapor is generated. The sensing unit includes an airflow sensor and an air pressure sensor. The power supply device is selectively enabled or disabled according to a result of detecting the airflow by the airflow sensor, and the air pressure sensor issues a detection signal to the control module according to a result of detecting a pressure of the airflow so as to adjust a speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid.

An electronic cigarette includes a power supply device, an atomizer, a liquid storage structure, a fluid transportation device and a sensing unit. The atomizer includes an electric heater. The liquid storage structure includes a passageway and a liquid container for storing cigarette liquid. The fluid transportation device is in communication with the liquid container and the atomizer for transferring the cigarette liquid to the atomizer at a certain amount. Consequently, an atomized vapor is generated. The sensing unit includes an airflow sensor and an air pressure sensor. The power supply device is selectively enabled or disabled according to a result of detecting the airflow by the airflow sensor, and the air pressure sensor issues a detection signal to the control module according to a result of detecting a pressure of the airflow so as to adjust a speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid.

The invention suppresses hysteresis. A relief valve switching between whether to discharge oil through movement of a valve body includes: a first spacing part, in which the valve body moves; a second space part, connected with the first space part and having a diameter smaller than a diameter of the first space part; an elastic body, connected with the valve body; a seal part, disposed in a circumferential direction of the valve body; and a third space part, formed in the first space part.