A coil spring is disposed in a fluid passage between a cylindrical body and a valve element to urge the valve element toward a closed position. The coil spring comprises a valve support portion supporting the valve element, a secured portion secured to an inner peripheral surface of the fluid passage, an expanding-contracting portion extending from the secured portion, and a connecting portion between the expanding-contracting portion and the valve support portion. The connecting portion comprises a first portion curved so as to pass radially outward of an end winding portion of the expanding-contracting portion, a second portion passing through the center of the valve support portion, a third portion extending curvedly so as to overlap the first portion, and a fourth portion extending to the valve support portion. When the coil spring is compressed, the valve support portion is supported to the expanding-contracting portion 54 through the connecting portion.

A valve assembly (10) comprising a male coupling member (100) and a female coupling member (200) which are connectable by inserting a probe (110) of the male member into a socket (210) of the female member. A fluid passageway (120) within the male member has an aperture (122) on the probe that is opened and closed by a second closing member. A fluid passageway (220) within the female member has an aperture (222) within the socket that is opened and closed by a first closing member (230) moveable within the socket. When mated, fluid flows between the two fluid passageways. The female member includes a first cage (240). During insertion of the probe into the socket, the first cage releasably locks the first closing member to the probe such that the cage carries separation forces created due to the pressure of the fluid within the fluid passageways.

A valve assembly (10) comprising a male coupling member (100) and a female coupling member (200) which are connectable by inserting a probe (110) of the male member into a socket (210) of the female member. A fluid passageway (120) within the male member has an aperture (122) on the probe that is opened and closed by a second closing member. A fluid passageway (220) within the female member has an aperture (222) within the socket that is opened and closed by a first closing member (230) moveable within the socket. When mated, fluid flows between the two fluid passageways. The female member includes a first cage (240). During insertion of the probe into the socket, the first cage releasably locks the first closing member to the probe such that the cage carries separation forces created due to the pressure of the fluid within the fluid passageways.

A non-circular disconnect, comprising: a male body to insert into a non-circular female disconnect; a male poppet, wherein: when the non-circular disconnect is not inserted into the non-circular female disconnect, the male poppet is held in place, via spring force, at an opening of the non-circular male body to create a seal to prevent leakage; and when the non-circular disconnect is inserted into the non-circular female disconnect, the male poppet is pushed inwards, to allow for liquid to flow through the non-circular disconnect, by a plunger in the non-circular female disconnect.

A connector system for medical fluid includes a male connector and a female connector that have a closed configuration when detached from one another. The first end of the male connector is configured to mate with a first end of the female connector. When the male connector is coupled with the female connector, complementary structures engage to move seals away from ports in the male connector and the female connector, opening a fluid pathway through the connectors. The mating ends of the connectors are not exposed to the medical fluid when the connectors are coupled so that when the connectors are disconnected, the mating ends are substantially free of residual medical fluid.

A connector system for medical fluid includes a male connector and a female connector that have a closed configuration when detached from one another. The first end of the male connector is configured to mate with a first end of the female connector. When the male connector is coupled with the female connector, complementary structures engage to move seals away from ports in the male connector and the female connector, opening a fluid pathway through the connectors. The mating ends of the connectors are not exposed to the medical fluid when the connectors are coupled so that when the connectors are disconnected, the mating ends are substantially free of residual medical fluid.

A locking mechanism for a quick connect coupling includes a locking sleeve that is axially displaceable for locking the quick connect coupling in a locked position and for unlocking the quick connect coupling in an unlocked position. The locking mechanism comprises a safety ring, the safety ring is axially displaceable for engaging the locking sleeve and the safety ring being partly inside or partly outside the locking sleeve. The safety ring being positionable in three different axial positions, a first axial position for allowing the locking sleeve to be in the unlocked position, a second axial position for allowing the safety ring to rotate, and a third axial position for allowing the locking sleeve to be in the locked position. The locking mechanism comprises a spring, the spring acting between the locking sleeve and the safety ring. The spring comprising a spring force forcing the locking sleeve and the safety ring away from each other. Methods using the locking mechanism are also provided.

A locking mechanism for a quick connect coupling includes a locking sleeve that is axially displaceable for locking the quick connect coupling in a locked position and for unlocking the quick connect coupling in an unlocked position. The locking mechanism comprises a safety ring, the safety ring is axially displaceable for engaging the locking sleeve and the safety ring being partly inside or partly outside the locking sleeve. The safety ring being positionable in three different axial positions, a first axial position for allowing the locking sleeve to be in the unlocked position, a second axial position for allowing the safety ring to rotate, and a third axial position for allowing the locking sleeve to be in the locked position. The locking mechanism comprises a spring, the spring acting between the locking sleeve and the safety ring. The spring comprising a spring force forcing the locking sleeve and the safety ring away from each other. Methods using the locking mechanism are also provided.

A female coupling unit for a hydraulic coupling device, comprises a female coupling body comprising a hollow core, wherein a rear sealing ring is provided along an inner circumferential surface of a sealing sleeve device and adapted to bear against and slide along a front end portion of a female poppet device during movement of the sealing sleeve device, wherein the rear sealing ring is configured to prevent flow of hydraulic fluid between the rear sealing ring and the female poppet device from the rear end of the female coupling body towards the front end of the female coupling body and enable flow of hydraulic fluid between the rear sealing ring and the female poppet device from the front end of the female coupling body towards the rear end of the female coupling body.

A female coupling unit for a hydraulic coupling device, comprises a female coupling body comprising a hollow core, wherein a rear sealing ring is provided along an inner circumferential surface of a sealing sleeve device and adapted to bear against and slide along a front end portion of a female poppet device during movement of the sealing sleeve device, wherein the rear sealing ring is configured to prevent flow of hydraulic fluid between the rear sealing ring and the female poppet device from the rear end of the female coupling body towards the front end of the female coupling body and enable flow of hydraulic fluid between the rear sealing ring and the female poppet device from the front end of the female coupling body towards the rear end of the female coupling body.