Dispensing – With discharge assistant – Rotary
Patent
1999-02-09
2000-09-12
Shaver, Kevin
Dispensing
With discharge assistant
Rotary
222 1, 13762413, 13762415, G01F 1120, B67B 700, E03B 6520
Patent
active
061164747
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a metering valve and a method for metering preferably pasty mediums.
Many different types of valves are employed for the metered delivery of fluids. Differing requirements must be fulfilled, depending on the field of application and the type of medium to be delivered. Above all it is important that on the one hand, a large discharge of the medium to be delivered is possible, and on the other hand, on reaching the desired amount, the discharge amount can be so heavily reduced that an exact metering is possible. Above all, with pasty mediums it is difficult to meet both these conditions together.
For example, in GB-A-2139322 a lifting valve is known with which the discharge rate may be reduced by an oscillating movement of the valve lifter. The valve according to GB-A-2139322 however is not at all suitable when applied for metering pasty mediums. The path between the valve entry and the valve exit is heavily curved and the valve chamber comprises large hollow cavities. This geometry has a negative effect on the flow behavior of pasty mediums and makes the exact metering difficult.
In particular, with delivery of mediums which do not keep for too long a time such as for example printing inks, it must be avoided that the medium, on account of its high viscosity, gets stuck in the hollow cavities and does not flow away by itself.
It is the object of the present invention to avoid the known disadvantages, thus in particular to provide a metering valve and a method for the delivery of preferably pasty mediums, which with high maximum discharge rates, permits a precise metering, even of small quantities. A further object of the invention lies in providing a metering valve and a method for the metered delivery of mediums, with which the preferably pasty mediums have a small period of stay in the valve and do not get stuck in dead spaces. A further object of the invention consists of providing a metering valve and a method for the metered delivery of mediums, which can be manufactured or carried out simply and economically and whose valve comprises as little as possible moving parts and which may be simply cleaned.
According to this invention, a metering valve for the delivery of preferably pasty mediums comprises essentially a valve housing and a flow restrictor. The valve housing is provided with an inlet opening and an outlet opening. The inlet opening is for example connected to a storage container of the medium and the outlet opening may open into a smaller container. The valve according to the invention may be applied particularly well in an arrangement for mixing different fluids, with which each fluid is delivered in a metered manner into a common container by way of a valve. One advantageous purpose of application may be the manufacture of printing ink from various base colours. The flow restrictor is movably arranged in the valve housing between the inlet and outlet opening. The flow restrictor is also provided with at least one hole for forming a connection between the inlet opening and the outlet opening. For opening the valve, the flow restrictor may be moved into a position in which the hole connects the inlet opening to the outlet opening. For closing the valve, the flow restrictor is moved away from this position so that the inlet opening is in connection with the surface of the flow restrictor and there is no connection between the inlet opening and the outlet opening.
According to the idea of the invention, the hole may be intermittently positioned between the inlet opening and the outlet opening. This means that the connection between the inlet opening and the outlet opening exists only for a while. When the hole oscillates between a closed position and a completely opened position, thus intermittently positioned between the inlet and outlet opening, the flow of the medium is reduced per unit of time. The hole of the oscillating flow restrictor then comprises an effective cross-section which is smaller than the geometric cross-section which determines the flow quantity wit
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patent: 5148946 (1992-09-01), Mizuta et al.
Gruau Yves
Ruiz Jesus
Bonderer D A
Shaver Kevin
SICPA Holding S.A.
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