Fluid handling – Systems – Supply and exhaust
Reexamination Certificate
1999-07-02
2001-05-22
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Systems
Supply and exhaust
C091S420000, C137S884000, C137S886000
Reexamination Certificate
active
06234201
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a valve arrangement.
Valve arrangements using piston slide valves are known. The disadvantage of these known valve arrangements is that when additional functions are necessary for all or some fluid outlets, this leads to a relatively complex and expensive structure. One of these complex structures is a plate design which requires a plurality of partially very long holes and/or holes which adjoin one another at an angle, as fluid channels and a plurality of sealing sites, etc.
Compared to seat valves, piston slide valves have certain advantages, in that with a small structure relatively large flow cross sections can be accomplished, and in this way pressure drops in fluid systems can be reduced.
Furthermore, generic type valve arrangements are known in which to achieve a simplified structure, while preserving the basic advantages of piston slide valves, several slide valves or their housings are flanged in series, or without an additional valve plate, directly to a valve arrangement.
The object of the invention is to devise a valve arrangement with at least two piston slide valves flanged in series with their valve housings, in which (valve arrangement) the valves have optimum behavior, especially optimum dynamic behavior.
SUMMARY OF THE INVENTION
For the purposes of this invention a “fluid” is defined as a liquid or hydraulic medium, for example, an oil or a hydraulic medium based on another liquid, for example a water-based medium.
The piston slide valves, or their connections, can be made with an additional fluid function. These functions are, for example, additional closing and blocking functions, pressure and/or flow functions, and/or the function of a pilot-controlled check valve, a presser limiter, or a choker check valve.
In the invention, by accommodating the additional functions in the respective valve housing of the piston slide valve, it is possible to interconnect the individual piston slide valves, or their valve housings, by simple flanging in terms of fluid to a valve arrangement.
For the purposes of the invention “flanging” also means that the holes provided in the valve housings, which are made as through holes, and which are open on the connection surfaces, form distributor channels which extend through the valve arrangement for supplying the pressurized fluid (P-channels) and for discharging the fluid, for example, to a tank or to a reservoir (tank channels).
The valve housings in the invention are preferably made cuboidal, in a form such that in one axial direction they have, perpendicular to the connection surfaces, a width as small as possible, so that only very short holes are necessary for the channels for supplying and discharging the fluid.
The invention enables, while retaining the basic advantages of piston slide valves, and with optimum behavior, also the dynamic behavior of the valves, a small and compact, and mainly simplified structure of the valve arrangement, by reducing the number of required line holes and the number of sealing sites. In addition, a special connection plate (series connection plate) for mounting the piston slide valves is not necessary.
REFERENCES:
patent: 4377183 (1983-03-01), Johansson et al.
patent: 4382452 (1983-05-01), Loveless
patent: 4462427 (1984-07-01), Neff
patent: 4465100 (1984-08-01), Neff
patent: 4485846 (1984-12-01), Neff
patent: 4509556 (1985-04-01), Scanlon
patent: 4574844 (1986-03-01), Neff et al.
patent: 4709724 (1987-12-01), Williams
patent: 4770209 (1988-09-01), Neff
patent: 6131610 (2000-10-01), Morisako et al.
Hoffman Wasson & Gitler PC
Knapp MicroFluid, GmbH
Michalsky Gerald A.
LandOfFree
Valve arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Valve arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Valve arrangement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2477914