Liquid dispensing head with rinsing fluid inlet and installation

Claim 2

An installation for dispensing liquid from a container, comprising a dispensing head adapted to be fitted to the container having a valve plunger with which the dispensing head co-operates to enable liquid in the container to be dispensed through the dispensing head under pressure of a gas supplied to the container through the dispensing head, a source of pressurising gas connected to gas inlet means of the dispensing head and a dispensing tap connected to outlet means of the dispensing head through a length of delivery pipe, wherein the dispensing head has rinsing fluid inlet means connected to a source of a rinsing fluid and a valve member movable between a first position in which the rinsing fluid inlet means is closed, the gas inlet means is in communication with the interior of the container to which the dispensing head is fitted and the outlet means is in communication with the interior of the container through the valve plunger so that liquid is dispensed from the container through the dispensing tap, and a second position in which the outlet means is disconnected from the interior of the container and placed in communication with the rinsing fluid inlet means so that rinsing fluid flows through the outlet means, the delivery pipe and the dispensing tap, and wherein the installation includes control means operable from a position close to the dispensing tap for controlling the position of the valve member independently of the supply of gas to the gas inlet means.

Claim 3

An installation as claimed in claim 1, wherein the valve member is vertically movable in a body of the dispensing head between a first position in which, in use, the valve member engages the valve plunger of the container and holds it in its open position and a second position in which the valve member is disengaged from the valve plunger, the valve member including a piston movable in a cylinder forming part of the body of the dispensing head, and wherein the cylinder has a control inlet separate from the gas inlet means and connected to the course of pressurising gas through a control valve forming part of the control means so that when the control valve is open the pressure of the gas supplied to the cylinder through the control inlet surges the valve member to its first position.

Claim 4

An installation as claimed in claim 2, wherein the control valve is a manually operated valve positioned close to the dispensing tap.

Claim 5

An installation as claimed in claim 2, wherein the control valve is positioned in the region of the dispensing head and the source of pressurising gas, and in that auxiliary control means are provided for operating the control valve from a position close to the dispensing tap.

Claim 6

An installation as claimed in claim 4, wherein the auxiliary control means comprises a further control valve positioned close to the dispensing tap and connected in a branch line between the source of pressurising gas and the first control valve, the first control valve being operable by pressure of gas supplied to it through the further control valve.

Claim 7

An installation as claimed in claim 4, wherein the control valve is a solenoid-operated valve and the auxiliary control means comprises an electrical circuit for controlling operation of the valve, the electrical circuit including an operating switch positioned close to the dispensing tap.

Claim 8

An installation as claimed in claim 4, wherein the control valve is adapted to interrupt the supply of rinsing fluid to the further inlet of the dispensing head when pressurising gas is supplied to the control inlet to hold the valve member in its first position.

Claim 9

A dispensing head adapted to be fitted to a container having a valve plunger with which the dispensing head co-operates to enable liquid in the container to be dispensed through the dispensing head under pressure of a gas supplied to the container through the dispensing head, the dispensing head having first gas inlet means for connection to a source of the pressurising gas, outlet means adapted to be connected to a source of rinsing fluid, a valve member movable between a first position in which the rinsing fluid inlet means is closed, the first gas inlet means is in communication with the interior of the container to which the dispensing head is fitted and the outlet means is in communication with the interior of the container through the valve plunger so that liquid is dispensed from the container, and a second position in which the first gas inlet means is closed and the outlet means is disconnected from the interior of the container and placed in communication with the rinsing fluid inlet means so that rinsing fluid flows through the outlet means, and means for moving the valve member to said first position, comprising a piston coupled to the valve member and movable in a cylinder forming part of the body of the dispensing head, and second gas inlet means separate from the first gas inlet means and opening into the cylinder so that on supply of gas under pressure to the second gas inlet means the valve member is moved to its first position irrespective of the supply of gas to the first gas inlet means.

Claim 10

A dispensing head adapted to be fitted to a container having a valve plunger with which the dispensing head co-operates to enable liquid in the container to be dispensed through the dispensing head under pressure of a gas supplied to the container through the dispensing head, the dispensing head having first gas inlet means for connection to a source of the pressurising gas, outlet means adapted to be connected to a source of rinsing fluid, a valve member movable between a first position in which the rinsing fluid inlet means is closed, the first gas inlet means is in communication with the interior of the container to which the dispensing head is fitted and the outlet means is in communication with the interior of the container through the valve plunger so that liquid is dispensed from the container, and a second position in which the first gas inlet means is closed and the outlet means is disconnected from the interior of the container and placed in communication with the rinsing fluid inlet means so that rinsing fluid flows through the outlet means, and means for moving the valve member to said first position, comprising a piston coupled to the valve member and movable in a cylinder forming part of the body of the dispensing head, and second gas inlet means separate from the first gas inlet means and opening into the cylinder so that on supply of gas under pressure to the second gas inlet means the valve member is moved to its first position irrespective of the supply of gas to the first gas inlet means.

Claim 11

A dispensing head as claimed in claim 8 wherein the valve member is vertically movable in a body of the dispensing head so that in the first position the valve member engages the valve plunger of the container and holds it in an open position and in the second position of the valve member it is disengaged from the valve plunger.

Claim 12

A dispensing head as claimed in claim 8, wherein a further inlet to the cylinder is adapted to be connected to the source of pressurising gas so that supply of gas to the further inlet whilst supply to the second gas inlet means is cut off urges the valve member to its second position.

Claim 13

A dispensing head as claimed in claim 8, characterised in that the valve member has a longitudinal channel providing the outlet means, and a one-way valve is positioned in the channel to prevent rinsing fluid from entering the container to which the head is fitted.