Valve, and method for manufacturing said valve

A method for manufacturing a valve, wherein the valve is a valve of top entry type, comprising:

• a body having one of a depression and a projection;
• and a valve disc having the other of the depression and the projection on a tip end side in a direction in which the valve disc is inserted into the body, the valve disc being configured to be placed in the body by fitting the projection in the depression,
• the depression having, on an opening side, a tapered section that has an inner diameter gradually decreasing toward a bottom of the depression,
• a part of a tip end edge of the projection being configured to be brought into contact with the tapered section when the projection is inserted into the depression,
• the tapered section being configured to guide the projection so that an entire circumference of the tip end edge of the projection is located on a bottom side with respect to the tapered section;
• said method for manufacturing a valve comprising:
• a first step of inserting the valve disc into the body through an upper end opening of the body, and allowing the valve disc to move downward to a lower portion of the body;
• and
• a second step of, following the first step, fitting the projection in the depression in the lower portion of the body, to place the valve disc at a predetermined position in the body,
• wherein, in the second step, a part of a tip end edge of the projection is brought into contact with the tapered section when the projection is inserted into the depression, and the tapered section guides the projection so that an entire circumference of the tip end edge of the projection is located on the bottom side with respect to the tapered section.

A valve of a top entry type, comprising:

• a body having one of a depression and a projection;
• a valve disc having the other of the depression and the projection on a tip end side in a direction in which the valve disc is inserted into the body, the valve disc being configured to be placed in the body by fitting the projection in the depression;
• and
• a bearing section disposed on an inner circumferential wall of the depression, and configured to be exposed to the depression;
• the depression having, on an opening side, a tapered section that has an inner diameter gradually decreasing toward a bottom of the depression,
• a part of a tip end edge of the projection being configured to be brought into contact with the tapered section when the projection is inserted into the depression,
• the tapered section being configured to guide the projection so that an entire circumference of the tip end edge of the projection is located on a bottom side with respect to the tapered section,
• wherein an end edge of the bearing section on the opening side of the depression is located on a bottom side of the depression with respect to an extension of an inclined surface of the tapered section of the depression.