Fluid handling – Removable valve head and seat unit – Threaded into valve casing
Patent
1994-09-26
1995-10-31
Nilson, Robert G.
Fluid handling
Removable valve head and seat unit
Threaded into valve casing
137536, 137538, F16K 1506
Patent
active
054620767
ABSTRACT:
Pressure limiting valves intended for use in underground mining and tunnel construction are able to release the pressure medium discharged if an overload occurs without problems into the return line, since the occurring back pressure is directly neutralized in the pressure limiting valve. For this purpose a discharge of the pressure medium is provided even before the spring chamber, for which purpose the crossbores arranged there are constructed in such a way that they expand, forming a water chamber with increased volume. This water chamber is located in ring form around the valve piston that is exposed in this area and is connected via return bores to the return line. The water chamber with accordingly large volume makes it possible that the back pressure acts simultaneously on the spring and the valve piston, so that the described neutralization takes place.
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Exner et al., Grundlagen und Komponenten der Fluidtechnik Hydraulik (The Foundation and Components of the Fluid Technology Hydraulics), Der Hidraulik Trainer, Band 1 pp. 216-217 (undated).
Creighton Wray James
Nilson Robert G.
Richard Voss Grubenausbau GmbH
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