Reed valve

A reed valve, comprising:

• a valve body;
• a valve seat having a valve hole for passage of a fluid;
• a casing accommodating the valve body;
• and
• a reed including an arm part having a first end portion connected to the casing, and a valve body support part connected to a second end portion of the arm part, the valve body support part supporting the valve body so as to allow the valve hole to be opened and closed,
• wherein, when a first direction is defined as a flow direction of the fluid in the valve hole, and a first surface is a surface facing downstream in the first direction among an inner surface of the casing, the first surface includes a recess facing the arm part,
• wherein the arm part has a through hole penetrating the first end portion,
• wherein the first surface of the casing has a protrusion configured to be inserted in the through hole, and
• wherein, when an extending direction is defined as a direction in which the arm part extends in a valve closed state where the valve body is in contact with the valve seat, a first end of the arm part is at a side of the first end portion, a second end of the arm part is at a side of the second end portion, and a first position is a position on a side surface of the protrusion closest to the second end in the extending direction, and
• wherein the recess is formed, in the extending direction, from a position between the valve hole and the first position to a position between the first position and the first end.

A reed valve, comprising:

• a valve seat having a valve hole for passage of a fluid;
• a valve body having a contact portion which comes into contact with the valve seat when the reed valve is closed;
• a casing accommodating the valve body;
• and
• a reed including a valve body support having an annular shape around the contact portion of the valve body, and an arm part extending from a first end connected to the casing to a second end connected to the valve body support,
• wherein the casing includes:
• a recess disposed in a radially outward region of the valve seat such that a bottom of the recess faces the arm part of the reed;
• and a ridge disposed around the valve seat in a radially intermediate region between the recess and the valve seat, the bottom of the recess being disposed such that a first axial distance between the valve seat and the bottom of the recess is greater than a second axial distance between the valve seat and the ridge.