Abstract: A connection valve for connecting together and disconnecting a tank and a hose without wastage or spillage. A first housing part has a duct containing a slidable piston and communicating with at least one connection socket. A second part has a throughbore, a socket coaxial with the duct, a plug for sealing said socket, and a locking device for locking the plug in a sealing position. An axial drawing means is provided for pressing a surface of rotation of the plug against a mating surface of the piston.

Abstract: A nozzle regulating device connected to a suction hose automatically regulates the suction at a nozzle. The suction will be a maximum when the fluid completely covers the suction inlet of the nozzle and a minimum when the suction inlet is completely clear of the fluid. A slide valve member is operable by two pistons of different diameters slidable in respective cylinders of a housing. A first pipe section connects the suction inlet with a valve port in the housing. A second pipe section connects the suction hose with another valve port in the housing. Thus, the suction applied to the suction inlet from the hose is under the control of the slide valve member. A pipe connects the drive space in the larger diameter cylinder housing to the first pipe section, and another pipe connects the drive space in the other cylinder housing to the second pipe section.