Excess flow valve device and valve assembly

A valve assembly including

• a body including a gas channel, the gas channel including a first channel and a second channel, and
• an excess flow valve configured to restrict flow of gas when a flow rate of the gas flowing through the second channel in a predetermined direction exceeds a predetermined rate, wherein:
• the first channel is configured to be connected to a gas tank that stores the gas;
• the second channel is configured to be selectively connected to any one of a plurality of external devices;
• the plurality of external devices includes a supply source of the gas to be charged into the gas tank, and a consumption device configured to consume the gas fed from the gas tank;
• the second channel includes a valve disc housing portion that houses at least part of the excess flow valve;
• the predetermined direction is a direction in which the gas is fed to the consumption device;
• the excess flow valve includes
• a valve seat provided in the valve disc housing portion and having a valve orifice,
• a valve disc configured to be slidably housed in the valve disc housing portion, and
• a biasing member configured to bias the valve disc in a direction away from the valve seat;
• the valve disc includes
• a head configured to close the valve orifice when the head is seated on the valve seat, and
• a protruding portion protruding from the head and configured to be inserted into the valve orifice;
• a position where the valve disc is located farthest from the valve seat is an open position, and a position where the valve disc is seated on the valve seat is a closed position;
• a travel range of the valve disc between the open position and the closed position includes a first transition range and a second transition range;
• the first transition range is a range in which the valve disc travels with the protruding portion entirely located in the valve disc housing portion;
• and
• the second transition range is a range in which the valve disc travels with at least part of the protruding portion located in the valve orifice.