Valves and valve actuation – Valve – Materials
Patent
1993-04-15
1996-09-17
Lee, Kevin
Valves and valve actuation
Valve
Materials
251366, 251282, F16K 2500
Patent
active
055560750
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a high pressure valve having a valve cone guided by a valve spindle within a valve housing, which valve cone in its closed position engages an annular ridge of hard metal, in particular steel, consituting a valve seat.
Such valves make use of the plastic deformation to which the soft sealing surface is subjected when engaging the hard metal seat, to ensure a constant sealing effect of the valve over an extended period of time. Such a valve has been described, for instance, in German laid-open patent specification DE-A-1 190 756. In the known valves the valve cone is made of copper or of copper-plated or gold-plated steel, and is mounted on a conventional valve spindle, made, for instance, of steel. Such construction requires the separate manufacturing steps of assembly, and the plating of the valve cones, as the case may be.
Furthermore, steel spindles and valve cones made of steel have a high mass inertia which at periodic switching operations of the valve leads to a dynamic pressure loss in the range of about 4-5 bar. Finally, such cone/spindle structures are unsuited for actuation by an electromagnet as they are potentially subject to magnetization.
SUMMARY OF THE INVENTION
It is, therefore, an object of the invention to provide a high pressure valve of the structure referred to in the introduction, which is extremely tight, is of a low mass inertia in a switching operation, and in which the spindle and the valve cone may be assembled in a simple manner and may be actuated by an electromag-net. In accordance with the invention, this object is accomplished by the valve cone, the sealing surface and the valve spindle being an integral structure made of aluminum, and by the valve being a pressure compensated high pressure valve. In accordance with the invention, the dynamic mass of the valve spindle/valve cone structure and, hence--in a periodically switched valve--the dynamic pressure loss is reduced. Furthermore, the manufacture of the valve is simplified because of the one-piece structure of the valve cone, the sealing surface, and the valve spindle. In addition, because of the non-magnetec property of aluminum, an additional advantage is obtained, in that magnetization of the cone/spindle structure by an electromagnet used for actuating the spindle, is avoided. Magnetization does occur in known steel spindles and results in additional dynamic pressure losses because of the attraction forces of the magnetized parts, and in disturbing inherent spindle movements which have not been completely understood.
In the pressure compensated valve structure in accordance with the invention, the aluminum sealing surface is not pressed against the steel annular ridge at full operating pressure, rather, the pressure is generated entirely by the control force acting upon the spindle. It can be seen that because of that, wear of the soft metal sealing surface over an extended time is substantially avoided.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be explained in more detail with reference to the drawing which depicts a two-position, two-way valve in longitudinal section, with the sealing arrangement in accordance with the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The valve is provided with a two-part valve housing 1, 2, the upper part 1 of which at 3 is threaded to the lower part 2. At its upper end the upper part 1 is provided with a terminal flange 4, and at its lower end it is provided with an external thread 5 having standardized outer dimensions, so that the upper part 1, together with the threaded-in lower part 2, may be screwed into a standardized threaded valve receiving bore. A flange seal 6 assures a leak-proof seat of the valve in the threaded bore (not shown). Valves of this kind are also called screw-in cartridge valves (cartridge valves).
The lower part 2 of the housing has a lesser external diameter than the upper part 1 of the housing and in a screwed-in condition thus constitutes a lower valve section 7 of reduced outer d
REFERENCES:
patent: 385052 (1888-06-01), Hodges et al.
patent: 2695628 (1954-11-01), Wheildon, Jr.
patent: 2797061 (1957-06-01), Buchanan
patent: 3060970 (1962-10-01), Aslan
patent: 3770009 (1973-11-01), Miller
Hormann Karl
Lee Kevin
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