Abstract: A connector housing of a valve connector integrally has a tube connecting portion on one axial end thereof, a pipe inserting portion on the other axial end thereof, and a valve housing between the tube connecting portion and the pipe inserting portion. A valve housing houses a valve body and a compression spring that biases the valve body in an axial direction into abutment with a housing inner surface. Anti-rotation ribs are provided integrally on an inner peripheral surface of the valve housing. The anti-rotation ribs abut the valve body so as to restrain the valve body from rotating.

Abstract: A valve connector has a connector housing with a through-path and an internal valve disposed in the connector housing for opening and closing the through-path. The internal valve has a valve body with a plurality of guides. Each of the guides is provided with a support recess for receiving an axial end portion of a compression spring. A radially inward portion on a radially inward end of the guide with respect to the support recess extends longer than a radially outward portion on a radially outward end of the guide with respect to the support recess.

Abstract: A connector is inserted into a connection hole provided on a fluid piping equipment, and the connector is prevented from dropping out via a retainer held by a retainer holding portion. The connector has a connecting portion including a flange stop portion, and a positioning means is disposed between the connecting portion and the fluid piping equipment. This positioning means is to position the connecting portion in a circumferential direction so as not to rotate relative to the connection hole and has a mounting angle adjusting function capable of positioning the connecting portion in the circumferential direction selectively at any one of a number of mounting angular positions relative to the connection hole. An annular surface on the other end in the axial direction of the stop portion is formed in a taper shape tapered toward the other end in the axial direction.

Abstract: A connector is inserted into a connection hole provided on a fluid piping equipment, and the connector is prevented from dropping out via a retainer held by a retainer holding portion. The connector has a connecting portion including a flange stop portion, and a positioning means is disposed between the connecting portion and the fluid piping equipment. This positioning means is to position the connecting portion in a circumferential direction so as not to rotate relative to the connection hole and has a mounting angle adjusting function capable of positioning the connecting portion in the circumferential direction selectively at any one of a number of mounting angular positions relative to the connection hole. An annular surface on the other end in the axial direction of the stop portion is formed in a taper shape tapered toward the other end in the axial direction.

Abstract: A welding joint for a fuel tank includes a cylindrical portion and an annular weld portion. The weld portion has a multi-layer structure formed by layering an inner layer member made of a resin alloy material obtained by alloying a modified HDPE, to which a functional group having a high affinity to a hydroxyl group of EVOH is introduced, and EVOH, or by alloying the modified HDPE, normal HDPE and EVOH, and an outer layer member which uses the HDPE resin and/or modified HDPE resin and has high weldability to the fuel tank. Each of the inner and outer layer members is heat-welded to the fuel tank at a corresponding welding end surface. In a vicinity of at least one of the welding end surfaces of the inner outer layer members, a flow preventing portion that prevent a molten part of the inner layer member from flowing the outer layer member is provided.

Abstract: A connector housing of a valve connector integrally has a tube connecting portion on one axial end thereof, a pipe inserting portion on the other axial end thereof, and a valve housing between the tube connecting portion and the pipe inserting portion. A valve housing houses a valve body and a compression spring that biases the valve body in an axial direction into abutment with a housing inner surface. Anti-rotation ribs are provided integrally on an inner peripheral surface of the valve housing. The anti-rotation ribs abut the valve body so as to restrain the valve body from rotating.

Abstract: A valve connector has a connector housing with a through-path and an internal valve disposed in the connector housing for opening and closing the through-path. The internal valve has a valve body with a plurality of guides. Each of the guides is provided with a support recess for receiving an axial end portion of a compression spring. A radially inward portion on a radially inward end of the guide with respect to the support recess extends longer than a radially outward portion on a radially outward end of the guide with respect to the support recess.

Abstract: The connector housing is integrally provided with a tube connecting portion on one axial end thereof and a pipe inserting portion on the other axial end thereof. An internal valve is disposed in the connector housing for opening and closing the through-path. The internal valve has a valve seat surface defined on an inner peripheral surface of the tube connecting portion. A valve body includes a closing portion with an abutting surface for abutting with the valve seat surface on an outer peripheral portion of the closing portion, and a compression spring biases the valve body in an axial direction. The valve body is configured to be movable in the axial direction within confines of the tube connecting portion that is provided with an annular stop rib.

Abstract: A quick connector for a fuel piping is constituted by a connector main body having a vertical insertion pipe inserted and fitted into an insertion hole of an mating side installed equipment and a nipple portion formed laterally with respect to the insertion pipe, and an elastic hook portion having a latching hook elastically latched to a latched portion provided in the installed equipment. The elastic hook portion may be structured as an independent body from the connector main body. Or the latching hook may be structured such as to be latched to the latched portion inward from an outer side.

Abstract: A first metal laminate sheet in a form of strip is rolled into a cylindrical shape to form a first impermeable layer. A first gap is defined between widthwise opposite edges of the first metal laminate sheet. Then, a second metal laminate sheet in a form of strip is rolled into a cylindrical shape on an outer periphery of the first metal laminate sheet, with intervening a rubber elastic layer therebetween, to form a second impermeable layer. A second gap is also defined between widthwise opposite edges of the second metal laminate sheet. The first gap and the second gap are staggered with respect to each other in a circumferential direction.

Abstract: A connector mounting structure has a fluid line component with a connecting hole, a connector mounted to the fluid line component and a positioning mechanism. The connector includes a connecting portion inserted in the connecting hole. The positioning mechanism is arranged between the connecting portion and the fluid line component. The positioning mechanism includes a first engaging portion in the connecting portion and a second engaging portion in the fluid line component. The first and the second engaging portions engage with one another so as to position the connecting portion relative to the connecting hole in the circumferential direction. The positioning mechanism allows to position the connecting portion relative to the connecting hole selectively at any one of a number of the mounting angular positions. The second engaging portion may be formed below the rim portion of an opening of the connecting hole.

Abstract: A welding joint has a cylindrical portion being a connection portion and an annular fusion-welded portion disposed at a base end part of the cylindrical portion, the fusion-welded portion being configured to be thermal fusion welded to a resin-made fuel tank. At least parts of the fusion-welded portion and the cylindrical portion are integrally molded by employing a resinous alloy material in which a modified high-density polyethylene obtained by introducing a functional group of high affinity to a hydroxyl group of ethylene-vinylalcohol copolymer is alloyed with the ethylene-vinylalcohol copolymer singly or together with high-density polyethylene.

Abstract: A welding joint has a cylindrical portion being a connection portion, and an annular fusion-welded portion disposed at a base end part of the cylindrical portion, the fusion-welded portion being configured to be thermal fusion welded to a resin-made fuel tank. The cylindrical portion is constructed by employing a resinous alloy material in which a modified high-density polyethylene obtained by introducing a functional group of high affinity to a hydroxyl group of ethylene-vinylalcohol copolymer is alloyed with the ethylene-vinylalcohol copolymer, and at least the fusion-welded portion comprises an inner layer employing the resinous alloy material and an outer layer employing at least one of the high-density polyethylene and the modified high-density polyethylene and externally covering the inner layer.

Abstract: A hose with a corrugated tube has a corrugated tube disposed as an innermost layer. The corrugated tube has a corrugated portion in a shape of corrugations continued in an axial direction. Each of the corrugations includes a corrugation hill on a radially outer side thereof and a corrugation valley on a radially inner side thereof. The corrugation valley includes a bottom portion shaped flat and straight in an axial direction so as to define an axially straight cylindrical inner surface, and an axial length B of an opening portion defined between adjacent said corrugation valleys and an axial length A of the corrugation valley has a relationship of 0.15A=or<B=or<0.5A.

Abstract: A fluid-impermeable composite hose has a laminated layer composed of an inner winding layer formed by winding a laminated sheet spirally in a single layer, leaving a gap between every two adjoining turns, and an outer winding layer formed by winding a laminated sheet spirally in a single layer over the gap in the inner winding layer, leaving a gap between every two adjoining turns. The gap of the inner wind layer gives the hose flexibility and prevents the folding of the spirally wound sheet which might result in the failure of the hose to maintain its fluid impermeability.

Abstract: A fluid-impermeable composite hose has a wall including a laminated layer formed by longitudinally lapping a laminated sheet which contains a metallic foil, or a metallic layer formed by vapor deposition. The laminated layer is bound with thread wound about it at a density not exceeding 20%, and bound to an extent forming constrictions therein if required. The thread prevents the deformation in cross section of the hose and the separation of the overlapping edge portions of the laminated sheet which might otherwise be caused by the bending resistance of the laminated sheet. The constrictions improve the flexibility of the hose.

Abstract: A fluid-impermeable composite hose has a laminated layer having a high impermeability to a refrigerant, etc. and held between two resin layers having a thickness which is small enough to enable the hose to remain flexible. The resin layers secure and protect the laminated layer and protect a metallic foil in the laminated layer from any bending, deforming or stretching force acting upon the hose.

Abstract: A hose for transporting carbon dioxide refrigerant has a wall formed by a plurality of layers, in which at least one metallic layer impermeable to carbon dioxide is positioned between a radially inner layer and a radially outer layer in its wall. The impermeable layer is a metallic layer formed by vapor deposition, or a laminated layer of at least one resin film and at least one metallic layer formed by vapor deposition. The hose is highly impermeable to carbon dioxide refrigerant, and maintains this impermeability with a high degree of reliability even when the hose is stretched.

Abstract: A fluid-impermeable composite hose has a laminated layer composed of an inner winding layer formed by winding a laminated sheet spirally in a single layer, leaving a gap between every two adjoining turns, and an outer winding layer formed by winding a laminated sheet spirally in a single layer over the gap in the inner winding layer, leaving a gap between every two adjoining turns. The gap of the inner wind layer gives the hose flexibility and prevents the folding of the spirally wound sheet which might result in the failure of the hose to maintain its fluid impermeability.

Abstract: A fluid-impermeable composite hose has a laminated layer having a high impermeability to a refrigerant, etc. and held between two resin layers having a thickness which is small enough to enable the hose to remain flexible. The resin layers secure and protect the laminated layer and protect a metallic foil in the laminated layer from any bending, deforming or stretching force acting upon the hose.