Valves and valve actuation – With material guide or restrictor – Movable or resilient guide or restrictor
Patent
1995-02-03
1996-12-03
Larson, James
Valves and valve actuation
With material guide or restrictor
Movable or resilient guide or restrictor
251208, F16K 4708
Patent
active
055800297
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a valve with presetting facility, having a valve housing, which has an inlet nipple and an outlet nipple, a valve shaft, the closure member of which co-operates with a valve seat, and a cylindrical sleeve arranged concentrically about the valve shaft, which sleeve has a substantially closed base lying with its end face against a base face fixed with respect to the housing, spaced therefrom the valve seat, and in its circumferential wall at least one through-flow opening leading to the one nipple, and, in order to adjust a preset throttle that is formed by eccentrically arranged overlapping control openings in the end and base faces, the sleeve is arranged to be rotated and be fixed in position.
A valve of that kind in the form of a radiator valve is known from DE-PS 22 53 462. The presetting serves to limit the maximum flow of heating medium through the associated radiator. The two control openings are half-moon shaped openings in the base and in a plate set in the valve housing. The sleeve is coupled with a bushing that guides and seals the valve shaft, and can therefore be externally adjusted. Maximum flow volume is produced when the two control openings coincide with one another exactly. By rotating the sleeve the overlap region is reduced and thus a limit on the amount flowing through is set.
The plate set in the housing is required because it is difficult to create a half-moon shaped opening inside the valve housing. This is an expensive solution, however, because the plate has to be secured against rotation, and for that reason has a pin-like member which engages in an extra bore in the valve housing. In addition, it is difficult to set the desired flow rate exactly. That applies particularly when the flow rate is to be restricted to small amounts and in so doing the required setting tolerances are to be observed. These are as follows:
SUMMARY OF THE INVENTION
The invention is based on the problem of providing a valve of the kind mentioned in the introduction which can be manufactured at less expense and, with a simple setting procedure, allows an exact limitation to be set even at low flow rates.
This problem is solved according to the invention in that the base face is part of the valve housing, the control opening in the base face is formed by an eccentric bore that is connected by way of a transverse bore to the other nipple, and the control opening in the end face is formed by a channel which extends over a circular arc of less than 360.degree. is connected at one end by way of an eccentric bore in the base to the inner space of the sleeve and has a cross-section that reduces towards the other end.
The preset throttle can therefore be manufactured with greater accuracy and inexpensively because only a flat base face and a bore associated therewith need to be provided in the valve housing and because providing the channel at the freely accessible base face of the sleeve, for example by milling, has no attendant problems. Adjustment is simple, because virtually a complete rotation is available as the preset range. On rotation, the channel shifts with respect to the control opening fixed in the housing. That determines the size of the overlapping area and the length of the throttling portion of the channel. Great precision is consequently achieved in the adjustment. For a given angular rotation of the sleeve, the area of overlap changes only a little and the length of the throttle passage changes in an exactly defined manner.
The channel preferably extends over a circular arc of at least 270.degree.. In that manner, the adjustment range can comprise virtually a complete rotation.
Advantageously, the channel profile has a depth and width that reduce towards the other end. On rotation, both the top side of the channel serving as control opening and the cross-section of the channel defining a throttle passage change. The channel may have, in particular, a V-shaped cross-section.
In a further construction, provision is made for the base of the sl
REFERENCES:
patent: 1160864 (1915-11-01), De Vaughn
patent: 2290783 (1942-07-01), Turpin
patent: 4205822 (1980-06-01), Bernat
patent: 4518147 (1985-05-01), Andresen et al.
patent: 4715579 (1987-12-01), Hammarstedt
Danfoss A/S
Larson James
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