Valve

A valve comprising:

• a housing part internally formed with an inlet flow path where a liquid flows in, an outlet flow path where the liquid flows out, and a valve hole that leads the liquid from the inlet flow path to the outlet flow path;
• a valve element part that comes into contact with or separates from a valve seat part disposed around the valve hole to bring the valve hole into a closed state or an open state, the valve element part being disposed in a first chamber in which the liquid from the inlet flow path flows to;
• and
• a diaphragm part that is coupled to the valve element part,
• wherein
• the diaphragm part includes
• a base,
• a tip part that is coupled to the valve element part and inserted into the valve hole, and
• a bellows part that couples between the base and the tip part and is formed with a valley adjacent to a peak, the bellows part being disposed in a second chamber in which the liquid from the first chamber flows to via the valve hole,
• a wetted part in contact with the liquid at the tip part is formed in a cylindrical shape extending along a shaft line and the wetted part extends through the valve hole,
• a lower end part of the bellows part is connected to the wetted part in a connection position coinciding with an outer peripheral surface of the wetted part in a radial direction orthogonal to the shaft line,
• the valley of the bellows part is disposed in the same position as the connection position in the radial direction, and
• the bellows part includes a portion thereof in between the valley and the peak which is positioned radially in between an outer circumference of the valve hole and an outer surface of the wetted part with respect to the shaft line.