| 摘要 |
<p>A valve assembly operable to fill a container with pressurized gas from a source thereof and to vent the cylinder and associated passage means in the valve assembly to atmosphere, the cylinder having a valve with a valve member spring biased to a closed position. The valve assembly has a valve housing having a main chamber, a supply port connectable to a source of pressurized gas, a fill port connectable to a cylinder to be filled, and a vent port communicating with the atmosphere, said supply port, fill port and vent port communicating with the main chamber. A valve body is mounted in the main chamber for movement therin and having a first passage operable in a first position of the valve body to connect the fill port to the vent port, second passage operable in a second position of the valve body to connect the supply port to the fill port, and a third passage operable in a third position of the valve body to connect the fill port to the vent port. A valve opening member movably mounted in the valve housing and acutated by the valve body when the body is moved to the second and third positions to engage and move the valve member of a cylinder secured to the fill port to an open position. When a source of pressurized gas is connected to the supply port and a cylinder in connected to the fill port, positioning of the valve body in the first position causes the fill port to be vented through the first passage and the vent port to the atmosphere, positioning the valve body in the second position causes the cylinder to be filled with gas from the source thereof, the gas passing through the second passage means, the fill port and the now-open cylinder valve into the cylinder, and positioning of the valve body in the third position causes the cylinder to be vented through the open cylinder valve, the fill port, the third passage means and the vent port to the atmosphere.</p> |
