Check valve

A check valve installed in a bore of a modulator block having an inlet fluid path and an outlet fluid path to control one-way flow of oil, the check valve comprising:

• a valve housing having upper and lower ends opened and having an inlet defined along the circumference of the valve housing, the inlet linked to the inlet fluid path;
• an upper cap coupled to seal up an open upper portion of the valve housing;
• a lower holder coupled to an open lower portion of the valve housing, having an outlet defined along the circumference of the lower holder, the outlet linked to the outlet fluid path, and having a first guide hole in a lower portion of the lower holder;
• and
• a plunger installed to move up or down to selectively open or close an orifice while elastically supported by an elastic member supported by the lower holder,
• wherein the valve housing has a sheet forming portion on an inner circumferential wall of the valve housing, the sheet forming portion extending inward from the valve housing to define the orifice,
• wherein the plunger comprises:
• a plunger body having a cylinder shape elongated in a vertical direction;
• at least one lower projection protruding at a bottom end of the plunger body and configured to slidingly move by coming into contact with an inner circumferential face of the first guide hole;
• a second guide hole defined at a top end of the plunger body and configured to move by being guided by a guide projection protruding from a lower side of the upper cap;
• a disc-shaped sheet portion radially protruding from a longitudinal center of the plunger body to come into contact with an inner circumferential face of the sheet forming portion in order to selectively open or close the orifice;
• a disc-shaped supporting portion radially protruding from the plunger body between the sheet portion and the at least one lower projection;
• a fluid path forming portion having a diameter smaller than a diameter of the sheet portion and located between the sheet portion and the top end of the plunger body;
• and
• a sealing member attached to the plunger body entirely between the sheet portion and the supporting portion,
• wherein the sealing member is configured to be in contact with a bottom face of the sheet forming portion to seal up the orifice, and
• wherein the sheet forming portion comprises:
• a curved surface guiding oil flowing in through the inlet downward, the curved surface transitioning to the inner circumferential face of the sheet forming portion via a bottom end of the curved surface;
• and
• a horizontal plane bending at the right angle from a bottom end of the inner circumferential face of the sheet forming portion to contact the sealing member.

A check valve installed in a bore of a modulator block having an inlet fluid path and an outlet fluid path to control one-way flow of oil, the check valve comprising:

• a valve housing having upper and lower ends opened and having an inlet defined along the circumference of the valve housing, the inlet linked to the inlet fluid path;
• an upper cap coupled to seal up an open upper portion of the valve housing;
• a lower holder coupled to an open lower portion of the valve housing, having an outlet defined along the circumference of the lower holder, the outlet linked to the outlet fluid path, and having a first guide hole in a lower portion of the lower holder;
• and
• a plunger installed to move up or down to selectively open or close a cylindrical orifice while elastically supported by an elastic member supported by the lower holder,
• wherein the valve housing has a sheet forming portion on an inner circumferential wall of the valve housing, the sheet forming portion extending inward from the valve housing to define the cylindrical orifice,
• wherein the plunger comprises:
• a plunger body having a cylinder shape elongated in a vertical direction;
• at least one lower projection protruding at a bottom end of the plunger body and configured to slidingly move by coming into contact with an inner circumferential face of the first guide hole;
• a second guide hole defined at a top end of the plunger body and configured to move by being guided by a guide projection protruding from a lower side of the upper cap;
• a cylindrical sheet portion radially protruding from a longitudinal center of the plunger body to come into contact with an inner circumferential face of the cylindrical orifice of the sheet forming portion in order to selectively open or close the cylindrical orifice;
• a disc-shaped supporting portion radially protruding from the plunger body between the sheet portion and the at least one lower projection;
• a fluid path forming portion having a diameter smaller than a diameter of the sheet portion and located between the sheet portion and the top end of the plunger body;
• and
• a sealing member attached to the plunger body entirely between the sheet portion and the supporting portion.