Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
106Z688
Field of the Invention
The invention relates to a valve,especially a
radiator valve, having a pre-setting member and a loading spring
for the valve stem, with at least two sealing rings, staggered
; 5 in the longitudinal direction, bearing against the valve stem.
Prior Art
Valves of this kind are normally used as thermostat
radiator valves and, for reasons of safety, they have two seals
arranged one behind the other upon the valve stem, the second
seal carrying out its function only when the first is no longer
serviceable. Now, if the second, i.e. the outermost seal has
to be replaced, this requires the removal of the loading, or
tensioning, spring for the valve stem, and the withdrawal of
other parts built into the valve. Since this is time consuming
lS and therefore costly, it is the purpose of the present invention
to provide a valve of the type described above, in which the
second seal may be removed at no great cost, especially
without removing the valve stem tensioning spring.
Summary of the Invention
This purpose may be achieved in that part of the
; presetting member through which the valve stem passes is farther
away from the valve plate, or the like, than the loading spring
and the second sealing ring, which seals the presetting member
in relation to the valve stem, comes automatically at a
location on the valve stem outside the loading spring, i.e.
it is farther away from the valve plate, or the like, than the
loading spring. As a result of this, the second sealing ring
may be replaced without any difficulty by removing the pre-
setting member, and all of the other internal parts, especially
the loading spring, may be left in place.
According to one particular preferred example of
embodiment of the invention, the first sealing ring associated
with the valve plate, or the like, is inserted into a cup-shaped
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element assembled, or more particularly screwed, into the
neck area of the valve, the bottom of which separates the
interior of the valve from the neck area. In this connection,
and according to one very advantageous development of the
invention, the bottom of the cup-shaped element rests upon a
disc, the outside diameter of which corresponds to the
diameter of the said bottom, and which is supported by a step
or the like in the valve housing, the valve stem passing
concentrically through the said disc and constituting, in
conjunction with the bottom of the cup, an internal groove,
i.e. a groove associated with the valve stem, for the first
sealing ring. This provides advantages both in assembly and
- in production. From the production point of view, the advantage
is that the radial groove is eliminated and a central passage
for the valve stem is sufficient. From the point of view of
assembly, this is simplified and accelerated by the fact that
the sealing ring need be snapped into the retaining groove,
but is merely placed in the expanded portion of the passage.
j The same advantages are provided in another
configuration of the invention, in which the disc forms, in
conjunction with the bottom of the cup, an external groove
for a third sealing ring which seals off the cup-shaped
element from the valve housing. The said disc need not
necessarily be flat or of the same thickness over its entire
width.
According to another characteristic of the
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invention, the grooves for the second and fourth sealing
rings are formed by the presetting member and at least one
retaining member secured removably thereto. The design
of the grooves is therefore comparable with that of the
grooves for the first and third sealing rings. Here again
it is possible for a common element to form the missing
lateral surface for the two radial grooves. A point to which
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1~6Z688
special preference is given here is that the retaining member
is of a cup-shaped configuration, with one edge of the cup
projecting outwardly and the valve spindle passing
concentrically through the bottom of the cup. In this case
the edge of the cup forms the lower or inner flank of the
groove for the second sealing ring. The retaining member
must be held immovably in the presetting member in some
appropriate manner and, if necessary, it must be secured
separately. For example, the connection may be made by
means of an annular bead on the retaining member and a
corresponding annular groove in the resetting member. Under
certain circumstances, the friction between the two parts
may be sufficient to hold them. Finally, a screwed
connection is also possible.
Description of the Drawings
The invention will now be described in accordance
with the accompanying drawing which is a vertical section
, through an example of an embodiment of the invention.
Description of a Preferred Embodiment
The said example of embodiment is a thermostatically
controlled radiator valve, although the thermostat cap is
not shown. The latter holds the closure element, in the form
of valve plate 1, against the force of loading spring 2, in
the form of a coil compression spring, in the closed position,
in which it rests upon valve seat 4 which is integral with
housing 3.
Neck part 5 of valve housing 3 has an internal
thread 6 into which a cup-shaped element 7 is screwed, and
bottom 8 of the cup, through which valve stem 9 passes
~` 30 concentrically, thus separates interior 10 of the valve
from neck part 5. A circular disc 12 lies upon a step 11
in the housing, being pressed thereto by means of cup-shaped
element 7.
1062688
- Screwed into internal thread 13 of cup-shaped
element 7 is a presetting member 14 which is also cup-shaped,
but is inverted in relation to element 7, so that base 15 is
at the top. Valve stem 9 passes concentrically through the
said base 15 of presetting member 14. A first sealing ring
16 and a second sealing ring 17 serve to seal off the valve
stem passages through cup-shaped element 7 and presetting
element 14. Groove 18 for the first sealing ring 16 is formed
by a central bore passing axially through cup bottom 8 on the
one hand, and by the inner edge of annular disc 12 on the
other hand. A groove for second sealing ring 17 is obtained
in a similar manner by means of a central recess on the inside
of bottom 15 of presetting member 14 and a retaining member
29. The lat~er is also in the form of a cup bottom 20
thereof, through which valve stem 9 passes concentrically
; constituting the lower side of groove 19.
The outer edge of disc 12, in conjunction with
a peripheral groove of rectangular cross section at the
outer edge of bottom 9, forms a groove 21 for a third
sealing ring 22. A fourth sealing ring 23, located in a
., :
groove 24, is held in a similar manner, the said groove
~' being formed by the radially outwardly projecting edge 25
of retaining member 29 and another peripheral channel of
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~ rectangular cross section at the edge of presetting member 14. ~
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~ 25 Valve interior 10 is sealed off by first sealing
. .
' ring 16 and third sealing ring 22. If the said first sealing
~ ring fails, the medium, f~or example hot water, can enter
;~ chamber 26. Second sealing ring 17 and fourth sealing ring
23 prevent the meaium from flowing out of chamber 26. One
; 30 end of loading spring 20 bears against bottom 8 of cup~
shaped element 7, while the other end bears against a collar
or circlip 27 on valve stem 9. The distance between circlip
27 and the inside of bottom 15 of presetting member 14 also
.
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corresponds to the maximal lift of valve plate 1. This lift
may therefore be altered by screwing in presetting member 14
to a greater or lesser extent. Retaining member 29 has an
outwardly projecting, peripheral, annular head 28 engaging
;;i 5 with a corresponding annular groove in presetting member 14
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`~ and is thus locked. These two parts may also be locked
s; together in some other known and appropriate manner.
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Assembly of the four sealing rinqs 16, 17, 22,
and 23 is simplified by the use of disc 12 and retaining
member 29. The same also applies to the machining of the
sealing grooves for cup-shaped element 7 and presetting
member 14.
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