Valves and valve actuation – With material guide or restrictor – Movable or resilient guide or restrictor
Patent
1999-02-09
2000-08-08
Lee, Kevin
Valves and valve actuation
With material guide or restrictor
Movable or resilient guide or restrictor
251356, F16K 136, F16K 152
Patent
active
060989556
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a valve arrangement for the delivery of fluids.
BACKGROUND OF THE INVENTION
For the temporary closing off or throttling of a gas, vapour or fluid flow, a multitude of different types of valves are known. It is for instance differentiated between straight-way valves with a linear fluid flow, corner valves with a bent flow and shuttle valves. In many areas of application, highly viscous fluids, for some part under pressure, are led through the valves. In spite of the high viscosity, the gas, vapour or fluid flow delivered from the valve should run as uniformly as possible. Particularly with valves in which a change in direction of the fluid flow is effected, it is difficult to achieve such a uniform delivery. With the valve closed, the fluid to be delivered presses laterally on a closing element, for example on a valve lifter. As soon as the closing element is moved away and thus the valve is opened, the fluid is delivered. When the highly viscous fluid enters laterally under pressure into the valve, it is often not possible for a delivery of the fluid in a straight jet. Depending on pressure and viscosity of the fluid, there results a deviation of the jet. The above mentioned problems are present for example with highly viscous fluids such as printing inks.
SUMMARY OF THE INVENTION
It is the object of the present invention to avoid the disadvantages of that which is known, in particular to provide a valve arrangement for the delivery of fluids, by way of which the delivery also of highly viscous fluids is possible in a uniform jet. A further object of the present invention lies in providing a valve arrangement which can be simply and cheaply produced and which is composed of as little as possible moving parts. The device according to the invention is also to be able to be cleaned in a simple manner.
U.S. Pat. No. 3,286,736 discloses a valve for use with viscous liquids which comprises a cylindrical distribution space in which a closing element having a conical sealing surface is displaceably arranged.
According to the invention, these objects are achieved with a valve arrangement with the features of claim 1.
The valve arrangement having the features of the invention consists essentially of a valve housing and a closing element movably arranged in the valve housing. The valve housing is provided with a lateral inlet opening and an axial outlet opening. The outlet opening can be closed with a sealing section of the closing element in a valve seat of the valve housing. The valve seat is arranged axially at a distance to the inlet opening. So that a uniform delivery of also a highly viscous fluid, where appropriate under pressure, is made possible, between the valve seat and the inlet opening there is provided a circumferential distribution space which at least with a closed valve arrangement, is in connection with the inlet opening. In this context, highly viscous fluids are to be understood as fluids such as printing inks of which the viscosity is typically more than 2 Pa.multidot.s. On the one hand the distribution space is limited by the inner surface of the valve housing and on the other hand by the outer surface of the closing element. When the valve is closed, the fluid fills the circumferential distribution space so that a uniform pressure prevails in the whole circumference of the closing element. As soon as the sealing section of the closing element is brought out of engagement with the valve seat, the fluid collected in the distribution space leaves the valve. Due to the homogeneous pressure distribution of the fluid in the distribution space, the delivery is effected uniformly.
The closing element is preferably axially displaceably mounted in the valve housing. Other arrangements however are also conceivable, for example a rotatable closing element, which by rotation opens or closes holes for the delivery of the fluid.
In a particularly advantageous embodiment example, the width of the distribution space continually reduces from a point of maximum width towards the ou
REFERENCES:
patent: 1891374 (1932-12-01), Ehemann
patent: 3753547 (1973-08-01), Topham
Lee Kevin
SICPA Holding S.A.
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