Abstract: A valve core includes: a barrel part that is cylindrical; a barrel packing that surrounds an outer lateral surface of the barrel part; a washer through which the barrel part penetrates and which abuts on the barrel packing from above; and a head part that includes a male screw part at its outer lateral surface and that rotates relative to the barrel part, wherein a lower surface of the head part abuts on the washer from above.

Abstract: A valve core includes: a core body screwed with a female screw part of a core mounting hole and formed of a seal ring, and a support base including a male screw part and a sleeve part; a shaft part penetrating through the support base; a valve body provided at a tip of the shaft part; an overhang part provided at the sleeve part so as to laterally overhang from a basal end of the sleeve part; a plate part provided at the support base so as to project to a basal end side from the basal end of the sleeve part and having a pair of flat tool abutting surfaces; and a shaft receiving hole penetrating through the plate part. The seal ring has a shape of a ring whose cross-sectional shape is quadrangular and the overhang part and the seal ring abut on each other by their surfaces.

Abstract: A valve includes a tubular body having one end attached to a valve attachment hole; a valve opening; a valve member to open and close the valve opening; a shaft part extending axially along an the body; a valve body part extending radially from the shaft to slide in the opening; a valve chamber adjacent to the opening on one end side in the axial direction, connecting the opening and attachment hole entirely; a valve body holding mechanism holding the body part inside the opening as an operating force causing the member to move in the axial direction, allowing the body part to separate from the opening wherein the member receives an operating force moving towards one end side of the body; a retaining mechanism changes between a restricting state wherein the member is prevented from coming off, and a permitting state wherein the member is allowed to come off.

Abstract: A valve includes a tubular body having one end attached to a valve attachment hole; a valve opening; a valve member to open and close the valve opening; a shaft part extending axially along an the body; a valve body part extending radially from the shaft to slide in the opening; a valve chamber adjacent to the opening on one end side in the axial direction, connecting the opening and attachment hole entirely; a valve body holding mechanism holding the body part inside the opening as an operating force causing the member to move in the axial direction, allowing the body part to separate from the opening wherein the member receives an operating force moving towards one end side of the body; a retaining mechanism changes between a restricting state wherein the member is prevented from coming off, and a permitting state wherein the member is allowed to come off.

Abstract: In order to solve the problem, a valve core according to one aspect of the present disclosure including: a barrel part that is cylindrical; a barrel packing that surrounds an outer lateral surface of the barrel part; a flange part that abuts on the barrel packing from above; and a head part that includes a male screw part at its outer lateral surface and that rotates relative to the barrel part. A lower surface of the head part abuts on the flange part from above.

Abstract: A tire state monitoring device that is able to stabilize fixing of a sensor unit is provided. A tire state monitoring device includes a tire valve mounted on a tire wheel, a cylindrical nut screwed onto the valve stem of the tire valve, and a sensor unit that detects a tire state and transmits a detection result to an external part. A nut insertion hole, into which the cylindrical nut is inserted, is formed in the sensor unit. An elastic ring member is fitted on the outer peripheral surface of the cylindrical nut and elastically deforms in the radial direction of the cylindrical nut while the cylindrical nut is kept inserted in the nut insertion hole. The sensor unit is held by the cylindrical nut by a resilient force of the elastic ring member.

Abstract: A tire state monitoring device that is able to stabilize fixing of a sensor unit is provided. A tire state monitoring device includes a tire valve mounted on a tire wheel, a cylindrical nut screwed onto the valve stem of the tire valve, and a sensor unit that detects a tire state and transmits a detection result to an external part. A nut insertion hole, into which the cylindrical nut is inserted, is formed in the sensor unit. An elastic ring member is fitted on the outer peripheral surface of the cylindrical nut and elastically deforms in the radial direction of the cylindrical nut while the cylindrical nut is kept inserted in the nut insertion hole. The sensor unit is held by the cylindrical nut by a resilient force of the elastic ring member.