Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1996-09-10
1999-11-02
Fox, John
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
123323, F16K 122
Patent
active
059751282
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a shut-off or throttle valve comprising a housing encircling a flow passage and a valve flap pivotally arranged about an axis of rotation extending across the flow cross-section of the valve, in particular for flow passages of combustion engines arranged for loading or discharging exhaust gases, the surface of the valve flap being subdivided into a pair of sections by said axis of rotation.
A valve flap has been known which is inclined with respect to the direction of fluid flow when it is in its closed position in order to avoid jamming caused by thermal expansions and which therefore has an inclined cylinder section so that its peripheral surface sealingly engages the tube wall and, respectively, the wall of the cylindrical valve housing. This measure for preventing jamming is effective only at the peripheral portions which are farest from the axis of rotation; it is uneffective in the area of the peripheral portions intersecting the axis of rotation because there is no inclination with respect to the tube axis in the direction of the axis. At this location it is necessary to provide a gap to compensate for thermal expansions, and as a result the valve is not sealed there. For providing the complicate shape of the valve flap, the flap has to be ground or milled at its periphery, which on the one hand will cause high machining costs and on the other hand cannot prevent leakage losses through the valve which increase with higher pressures.
Furthermore, it has become known to provide recesses in the internal wall of the valve housing which are engaged by the valve flap portions remote from the axis of rotation when being in the closed position inclined to the direction of fluid flow, further including abutment surfaces facing said valve flap portions, which abutment surfaces are engaged by the valve flap when it is in its closed position. Also with this arrangement, milling operations of the valve housing are required, and the above mentioned leakage losses in the area of the valve flap peripheral portions intersecting the valve axis are also true for this type of valve.
When such a valve is used in the exhaust conduit of a combustion engine provided with an exhaust gas heat exchanger and a catalytic converter in order to conduct the exhaust gas either through the heat exhanger or through a bypass, with the valve being used for closing the bypass, energy is lost by leakage through the bypass valve. Leakage losses of more than 50% are possible.
The problem to be solved by the invention is to design a valve of the above identified type such that it reliably operates at varying temperatures, that it can be manufactured in a simple and cost effective manner and that it can be relatively easily assembled even under limited space conditions. In particular, it should be able to generate a ram pressure of 5 bar in the exhaust conduit of a combustion engine during idling, i.e. at about 500 rpm. Furthermore, the valve should be suited for a flow control, in particular for controlling the ram pressure in a conduit while remaining in a stable position even at small opening angles and under the influence of flow turbulences, or it should be suited to be used as a check valve, having an opening pressure which may be adjusted if desired.
For solving this problem the valve of the above identified type has been designed such that said valve flap when being in the closed position is located in a closing plane which contains said axis of rotation and extends transversely to the flow direction, and further the valve flap is spaced at its edge in all positions along all sides in the plane of the valve flap from the housing at a distance such that this distance cannot be overcome by thermal expansions to be expected in operation, and further that the peripheral portions of the housing include an abutment edge each extending towards the axis of rotation, and that said abutment edges are disposed on different sides of the valve flap and are associated to said valve sections so as to form a face seal.
Such
REFERENCES:
patent: 1282112 (1918-10-01), Oettinger
patent: 1469686 (1923-10-01), Petry
patent: 1550419 (1925-08-01), Beaurline
patent: 2147801 (1939-02-01), Scanlan
patent: 3234924 (1966-02-01), May
patent: 3635239 (1972-01-01), Farrer
patent: 4176690 (1979-12-01), Clark et al.
patent: 4246918 (1981-01-01), Dean
patent: 4380246 (1983-04-01), Casale et al.
patent: 5072753 (1991-12-01), Ackroyd
Fox John
Schatz Thermo Gastech GmbH
LandOfFree
Shut-off or throttle valve with pivotal flap does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Shut-off or throttle valve with pivotal flap, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shut-off or throttle valve with pivotal flap will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2122753