Abstract: Various embodiments of the teachings herein include a nipple. Some example nipples include: a fluid passage; a housing; a valve for the fluid passage; and a relief valve for the valve. The relief valve may include: a first sleeve axially movable for sealing against a first seal of the housing; a second sleeve for sealing against a second seal of the housing; and a third seal for sealing between the first sleeve and the second sleeve. Relative axial movement between the first sleeve and the second sleeve opens or closes, respectively by the direction of the axial movement. The relief valve, the first seal, and the third seal are arranged at a set radial distance from a central axis of the fluid passage.

Abstract: 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.

Abstract: Various embodiments of the teachings herein include a pulse counter for fluid pressure changes. The pulse counter may include: a first and a second housing part with a fluid passage; a circuit board at least partially enclosed within the housing, the circuit board comprising a light pulse transmitter and a light pulse receiver; a battery at least partially within the housing, the battery supplying electric power to the light pulse transmitter and the light pulse receiver; a rod slidably arranged within the housing, with one end of the rod within the fluid passage, and a second end arranged at least partly breaking a light pulse between the light pulse transmitter and the light pulse receiver; and a spring forcing the rod away from the light pulse and towards the fluid passage.

Abstract: Various embodiments of the teachings herein include a pulse counter for fluid pressure changes. The pulse counter may include: a first and a second housing part with a fluid passage; a circuit board at least partially enclosed within the housing, the circuit board comprising a light pulse transmitter and a light pulse receiver; a battery at least partially within the housing, the battery supplying electric power to the light pulse transmitter and the light pulse receiver; a rod slidably arranged within the housing, with one end of the rod within the fluid passage, and a second end arranged at least partly breaking a light pulse between the light pulse transmitter and the light pulse receiver; and a spring forcing the rod away from the light pulse and towards the fluid passage.

Abstract: A locking mechanism for a quick connect coupling having a locking sleeve (100) is disclosed. The locking sleeve is axially displaceable for locking the quick connect coupling in a locked position (110) and for unlocking the quick connect coupling in an unlocked position (120). The locking mechanism comprises a safety ring (200), the safety ring (200) is axially displaceable for engaging the locking sleeve (100) and the safety ring (200) being partly inside or partly outside the locking sleeve (100). The safety ring being positionable in three different axial positions, a first axial position (210) for allowing the locking sleeve (100) to be in the unlocked position (120), a second axial position (220) for allowing the safety ring (200) to rotate, and a third axial position (230) for allowing the locking sleeve(100) to be in the locked position (110). The locking mechanism comprises a spring (300), the spring acting between the locking sleeve (100) and the safety ring (200).