Tap for compressed or liquefied gases having an overcharging prevention function

A tap for compressed or liquefied gases which has an overcharging prevention function, the tap comprising:

• an upper part body provided inside with a first passage and a second passage communicating with the first passage in a perpendicular direction of the first passage, the first passage being connected to an external gas source or a gas combustion apparatus;
• a check valve positioned on the first passage, permitting a gas flow only to the second passage when the pressurized gas above a certain pressure level is charged from the external;
• a safety valve which acts when pressure of the gas inside a gas storage tank is above the preset level and then allows the gas exceeding the preset pressure level to be externally discharged;
• and
• a two-way valve having upper portion connected to the upper part body, acting to prevent the gas charged through the first and second passages from overcharging exceeding a level preset in the gas storage tank and to externally discharge the liquefied gas charged in the gas storage tank at the time of opening the check valve,
• wherein the two-way valve comprises:
• a body provided inside with a third passage communicating with the second passage, the third passage being axially located by a first to third inner diameter parts which sequentially increase, and having at least one or more openings communicating with the inside of the gas storage tank and located at the second inner diameter part,
• a flux valve provided inside with a fourth passage communicating with the third passage, and acting to set the first inner diameter part of the body in a opened or closed condition,
• an elastic spring for imposing a force permitting a descent of the flux valve,
• a nut whose outer peripheral is coupled to the third inner diameter part of the body, and provided inside thereof with a stepped fifth passage communicating with the fourth passage,
• a buffering disk fixed to a lower end of the flux valve by means of the nut and between the fourth and fifth passages, and having a plurality of through-holes for absorbing an abrupt pressure change between the fourth and fifth passages,
• a level-controlling valve which sets the valve between the disk inside the fifth passage and the stepped portion in an opened or closed position, and to which elasticity is loaded, the elasticity acting in a downward direction so as to maintain the closed position at the non-loaded condition, and
• means for detecting a charging level in order to set the level-controlling valve in an opened position until the detected charging level inside the gas storage tank reaches the preset level, and to set the level-controlling valve in a closed position in the case of reaching the preset level.