Example tapered nut valve plug fastener apparatus disclosed herein include a valve stem, a first nut, a valve plug, and a second nut. The first nut includes a first tapered surface and the second nut includes a second tapered surface. The valve plug includes a bore. The first nut threadably engages the valve stem and the valve stem passes through the bore. The bore engages the first tapered surface. The second nut threadably engages the valve stem and the bore engages the second tapered surface.

A fluid control valve includes: a shaft member that moves along an axis of the shaft by a driving force from a driving source connected to one end of the shaft member; a holding member including a bottomed tubular portion into which the other end of the shaft member is inserted with a radial predetermined gap and which has a recess formed to be recessed radially inward from a surface of the tubular portion, and a valve body formed by fixing a sealing member to an outer periphery of a flat plate shaped main body portion that extends radially outward from the tubular portion; a housing that includes an inlet and an outlet of a fluid, has an annular valve seat on which the valve body abuts to block a communication between the inlet and the outlet, and accommodates the shaft member and the holding member.

A fluid control valve includes: a shaft member that moves along an axis of the shaft by a driving force from a driving source connected to one end of the shaft member; a valve body that is connected to the other end of the shaft member and includes a flat plate shaped main body portion having an outer periphery to which a sealing member is fixed; a housing that includes an inlet and an outlet, has an annular valve seat, and accommodates the shaft member and the valve body, in which the valve body is capable of swinging with respect to the shaft member, the valve seat includes an abutment portion and a protruding portion, and a tip end of the protrusion portion abuts on the main body portion in the state where the sealing member abuts on the abutment portion, so as to regulate movement of the valve body.

A fluid control valve includes: a shaft member that moves along an axis of the shaft by a driving force from a driving source connected to one end of the shaft member; a holding member including a bottomed tubular portion into which the other end of the shaft member is inserted with a radial predetermined gap and which has a recess formed to be recessed radially inward from a surface of the tubular portion, and a valve body formed by fixing a sealing member to an outer periphery of a flat plate shaped main body portion that extends radially outward from the tubular portion; a housing that includes an inlet and an outlet of a fluid, has an annular valve seat on which the valve body abuts to block a communication between the inlet and the outlet, and accommodates the shaft member and the holding member.

A regulating valve includes a valve body having a cylindrical portion, a valve stem inserted into the cylindrical portion and coupled to the valve body, and a locking member, in which the valve body includes a female screw including threads formed on an inner wall of the cylindrical portion and a plurality of first holes penetrating through an inner wall and an outer wall of a region of the cylindrical portion, the region having no threads of the female screw, in which the valve stem includes a male screw having threads formed on a surface close to the other end of the valve stem and at least one second hole formed in a region of the surface close to the other end of the valve stem, the region having no threads of the male screw.

A housing, a solenoid, a pin which can be moved by the solenoid, and a piston which is connected to the pin. The piston is pot-shaped and its base has an aperture. On the exterior of the base an arcuate yoke spans the aperture and the pin projects through the aperture in the base. The pin is connected to the arcuate yoke by a detent connection.

A valve assembly comprises a housing having a first chamber, a second chamber, and a valve seat disposed between the first and second chambers. A valve head is disposed in the housing and is moveable relative to the housing between an open position spaced from the valve seat and a closed position engaged with the valve seat. The valve head defines a bore therethrough along an axis. A valve stem is coupled to the valve head for moving the valve head between the open and closed positions. The valve stem is disposed in the bore and is moveable relative to the valve head from a sealed position preventing fluid communication through the bore to an unsealed position allowing fluid communication through the bore for relieving pressure differences between the first chamber and the second chamber when the valve head is in the closed position. An intermediate member is separate from and coupled to the valve seat and the valve head in the bore. The intermediate member is axially fixed to one of the valve stem and the valve head. The other of the valve stem and the valve head defines a travel space with the intermediate member retained in the travel space between the valve stem and the valve head. The travel space is sized larger than the intermediate member along the axis for allowing selective movement of the valve stem relative to the valve head between the sealed and unsealed positions.

A valve assembly includes a housing having a first chamber, a second chamber, and a valve seat disposed therebetween. A valve head disposed in the housing and is moveable between an open position and a closed position. The valve head defines a bore extending along an axis from the first chamber to the second chamber when the valve head is in the closed position. A valve stem is disposed in the bore and is coupled to the valve head in the bore for moving the valve head between the open and closed positions. The valve assembly allows for selective fluid communication between the first and second chambers to alleviate pressure differences between the first and second chambers. In one embodiment, the valve stem moves in the bore between a sealed position and an unsealed position. In another embodiment, a check valve is disposed in the bore.