Valve Assembly for a Dispenser for Fluids
A valve assembly for a dispenser for fluids includes a housing having at least an inlet opening and an outlet opening and a further opening connected or connectable to a fluid displacement mechanism, and a valve member comprising two parts translatably disposed within the housing, a first part for closing and opening the inlet and a second part for opening and closing the outlet.
1 . A valve assembly for a dispenser for fluids comprising:
a housing having at least an inlet opening and an outlet opening and a further opening connected or connectable to a fluid displacement mechanism, and
a valve member comprising two parts translatably disposed within the housing, a first part for closing and opening the inlet and a second part for opening and closing the outlet.
2 . The valve assembly according to claim 1 , wherein, in at least one position of the valve, the parts are resiliently biased or urged into closing abutment with the inlet and outlet openings.
3 . The valve assembly according to claim 2 , comprising an elastic element positioned between the first and second parts of the valve member.
4 . The valve assembly according to claim 3 , wherein the elastic element is a helical spring.
5 . The valve assembly according to claim 1 , wherein a resilient seat is provided at the interface between at least one of the parts and the opening it closes.
6 . The valve assembly according to claim 1 , wherein the first and second parts are resilient and a rigid element is positioned between the parts.
7 . The valve assembly according claim 6 , wherein the overall length of the valve parts and the rigid element exceeds the length of the cavity defined by the housing.
8 . The valve assembly according to claim 1 , comprising an operating element extending through the wall of the housing and coupled to the valve member.
9 . The assembly according to claim 8 , wherein the operating element provides at least three positions, a first position wherein both parts are in closing abutment with respective openings, a second position wherein the first part of the valve member is withdrawn from the inlet and the second part closes the outlet, and a third position wherein the second part of the valve member is withdrawn from the outlet and the first part closes the inlet.
10 . The valve assembly according to claim 1 , wherein at least one of the parts and/or the inner wall of the housing is provided with guides supporting translating motion of the parts and defining openings or channels that allow the fluid to flow from the inlet to the displacement mechanism and from the displacement mechanism to the outlet.
11 . The valve assembly according to claim 1 , wherein the direction of translation of the first and second parts and of the resilient bias are parallel or aligned and at least substantially normal to the area defined by the inlet and outlet openings.
12 . The valve assembly according to claim 1 , wherein the housing is connected to a piston pump.
13 . An apparatus for dispensing a plurality of fluids, comprising a support, such as a turntable or a linear table, a plurality of containers for holding a fluid and mounted on the support, pumps and valve assemblies according to claim 1 connected to respective containers.
14 . The apparatus according to claim 13 , wherein the pumps form an integral part of the valve assemblies.
15 . The apparatus according to claim 13 , wherein at least some of the pumps are located below the container and/or extend at least substantially horizontally.