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Radiator Valve 1.~'itting
The invention relates to a radiator valve fitting comprising a
housing having a screw-in socket, a supply passage extending
axially thereto and at least one discharge passage branching off
between the screw-in socket and suppl;,r passage, and a valve insert
housing having a bore, an inlet connecaion piece extending axially
thereto and projecting into the supply passage, at least one
radial outlet aperture and an external screwthread for screwing
the valve insert into the screw-in socket, the end of the housing
bore being provided with a valve seat between the inlet connection
piece and outlet aperture and an axi~~lly movable closure element
cooperating with the seat.
Such a radiator valve fitting is known from DE-PS 36 00 130. The
outlet aperture is arranged near where the discharge passages
branch off, so that the water can flow practically without
hindrance from the supply passage when the valve is open, through
the inlet connection piece and into l~he discharge passages. The
spacing between the outlet aperture and the end of the valve
insert housing projecting from the screw-in socket is relatively
large. The valve insert housing is provided with a pin that can
be actuated by a thermostat attachment. The fitting is fixed to
the radiator or may even be part o:E it. The actual valve is
disposed in the valve insert housing where the valve seat and
valve closure member are provided.
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There is an increasing demand for bE~ing able to set the maximum
flow through a radiator, the so-called k~ value, directly at the
valve. Setting basically takes place during assembly of the
radiator but subsequent adjustabilit:~ is an advantage.
Such a possibility of adjusting the k~ value is known from DE-PS
33 00 624. In this case, the flow section of the outlet aperture
is changed by a pre-setting insert which can be operated from the
end of the valve. In this known valve, however, the valve seat is
provided in the housing of the fittin~~ and not in the valve insert
housing. The screw-in socket is generally considerably shorter
than in valves of the aforementioned kind. Such a valve will
therefore always be useful if the flow is to be influenced in a
more or less straight pipe. This valve is not, however, usable
for so-called two plate radiators in which the supply line extends
between the two plates up to the valvES, the discharge passages are
perpendicular thereto and the valve with actuating attachment is
at least partially arranged between the plates. For such
radiators, a valve of the aforementioned kind will be necessary.
However, since in such a valve the screw-in socket is longer and
also varies in length for different makes of radiators, the pre-
setting inserts known from DE-PS 33 I)0 624 cannot be used in the
valve inserts known from DE-PS 36 00 130.
It is therefore the problem of the present invention to provide a
radiator valve fitting in which one cyan use a pre-setting insert
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of the kind used for radiator valves having a valve seat as part
of the fitting. This problem is solved in a radiator valve
fitting of the aforementioned kind in that the size of the outlet
aperture is adjustable with the aid of a pre-setting insert, that
the valve seat and outlet aperture are disposed at the level of
the external screwthread, and that the valve insert housing is
flattened near the outlet aperture, the external screwthread being
interrupted.
One can thereby employ the known pre-setting insert. Since this
is relatively short, the valve seat .and thus the outlet aperture
are transposed deeply into the screw-in socket, namely into the
region of the external screwthread. One thereby ensures that
always the same pre-setting insert cyan be employed regardless of
the length of the screw-in socket. 'This insert can therefore be
manufactured in larger numbers, thereby reducing the production
costs. The flattened region of the valve insert housing in which
the outlet aperture is arranged provides an adequate discharge
cross-section between the valve insert housing and the bore of the
screw-in socket. This cross-section is considerably larger than
in a bore that is simply led through the screwthread. The flat
can, for example, be produced by milling or grinding. Naturally,
there are limits as to how much screwt:hread can be removed and how
closely one can approach the valve ;peat. However, it has been
found that, despite the interruption of the screwthread for making
an adequately discharge cross-section available, a sufficient
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retaining force is applied by the screwthread. Depending on the
form of the valve fitting, the inlet connection piece projects
into the supply passage to a greater or lesser extent. The valve
insert housing can therefore be emp:Loyed for different radiator
valve fittings which vary in the length of the screw-in socket.
In every case, it is ensured that the supply passage is sealed
from the discharge passage by the inlet connection piece which has
a certain length.
In a preferred embodiment, a circumferential projection is
provided on the side of the external screwthread remote from the
inlet connection piece. This proje<aion fulfils two functions.
On the one hand, it brings about part of the seal to prevent the
water or other heating liquid from flowing out of the valve
fitting. On the other hand, the projection serves as an abutment
to define the depth up to which the 'valve housing element can be
screwed into the screw-in socket.
To make the discharge cross-section as large as possible, the
outlet aperture is formed by a radial bore having part of its
cross-section opening into the housin~3 bore, the remaining part of
the radial bore cross-section comprising a base which is formed
below the valve seat. Although a round drill is employed, this
permits one to achieve a discharge aperture having a cross-section
which is semicircular or a different part of a circle. The
cross-sectional area of the discharge aperture is thus larger than
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for a bore which is merely provided between the valve seat and the
projection.
Advantageously, the base of the radial bore is curved outwardly.
The bounding line between the base of the radial bore and the
housing bore preferably forms a section of a circle so that the
valve seat is in its plane alway~~~ surrounded by a strip of
substantially constant width. Closure members of different sizes
can therefore be employed.
To reduce noise, the transition between the wall and base of the
radial bore is rounded off. This provides better conditions for
avoiding the sources of noise.
In a preferred embodiment, the pre-setting insert is formed by a
skirt of which the lower edge rises circumferentially relatively
to a plane perpendicular to the longii~udinal axis of the valve and
which is rotatable about the longitudinal axis of the valve. This
brings about a relatively simply way of adjustment. By turning
the valve setting insert about the longitudinal axis of the valve,
the discharge cross-section can be increased or reduced.
Preferably, the transition between the external diameter of the
housing in the region of the screwthread and the smaller external
diameter of the inlet connection piecE~ is adjacent to the external
screwthread. For one thing, this saves material for the valve
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insert housing. For another, the largest possible discharge
cross-section is made available for the water flowing through the
valve into the radiator. Even if the constriction is still
located in the inlet connection piece, the water is not
excessively braked or throttled by the inlet connection piece.
Advantageously, the transition is Formed by a shoulder which
directly adjoins the screwthread and has a directly adjoining
cone. This ensures that the screwthread has a sufficiently large
diameter over an adequately long 7Length whilst the cone can
readily have a smaller maximum diameter without detrimentally
influencing the valve seat which, of course, is disposed in the
region of the external screwthread.
An example of the invention will now be described in conjunction
with the drawing of which the single figure is a cross-section
through the radiator valve fitting with valve insert housing.
A radiator valve fitting 1 comprises a housing with a screw-in
socket 2, a supply passage 3 and two discharge passages 4, 5 which
branch off between the screw-in sockei~ 2 and the supply passage 3.
The illustrated radiator valve fittin~~ serves to control a circuit
for the heating liquid in a two-platE~ radiator in which a supply
conduit is connected to the supply p<~ssage 3. The two plates of
the radiator are connected to the two discharge passages 4, 5.
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Screwed into the housing of the fitting, there is a valve insert
housing 6 having a shank carrier 7 with a housing bore 8 and an
inlet connection piece 9. The inlet connection piece 9 projects
from the screw-in socket 2 into the supply passage 3. The inlet
connection piece 9 is sealed from th~~ supply passage 3 by a seal
34. The shank carrier 7 is connected to the inlet connection
piece 9, for example by a sealed s~~rew connection. The inlet
connection piece comprises an external screwthread 11 with which
the valve insert housing 6 is screwed into a complementary
screwthread in the screw-in socket 2. Above the screwthread 11,
i.e. on the side remote from the .supply passage 3, the valve
insert housing is provided with a circumferential projection 35
which abuts a corresponding circumfe:rential projection 39 within
the screw-in socket 2. The valve insert housing 6 is sealed in
the screw-in socket 2 by a seal 33.
The bore 8 of the housing of the shank carrier 7 is extended by a
bore 36 of the inlet connection piece 9. A valve seat 12
cooperating with a closure element 13 is disposed at the base of
the housing bore 8, i.e. at the transition between the housing
bore 8 and the bore 36 of the inlet connection piece 9. When the
closure element 13 is pressed onto thE~ valve seat 12, the path for
heating liquid from the supply passage 3 into the discharge
passages 4, 5 is blocked. The valve seat 12 is substantially at
the level of the external screwthread 11.
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Directly above the valve seat, there is an outlet aperture 10
through which the heating liquid can flow from the supply passage
3 to the discharge passages 4, 5 when the closure element 13 is
retracted. The outlet aperture 10 is likewise disposed in the
region of the external screwthread 11. To make an adequate
discharge cross-section available for the heating liquid, the
valve insert housing is provided with a flat 15 in the region of
the external screwthread 11 at the ci.rcumferential position where
the outlet aperture 10 emerges. Although this interrupts the
screwthread il, the remaining part ensures adequate fastening of
the valve insert housing 6 in the fitting 1. Through the flat 15,
there is a bore 16 which at least partially opens into the housing
bore 8. The remaining part of the bore 16 comprises a base 17
disposed beneath' the valve seat 12. This makes the outlet
aperture 10 larger, namely broader, than if only one bore were to
be provided with a diameter corresponding to the spacing between
the valve seat and the projection 35. The base 17 of the bore is
spherically rounded off so that the valve seat 12 is surrounded by
an annular spherical surface having a substantially constant width
over the entire circumference. This enables one to employ
different closure elements 13 without: having to make a new valve
seat 12 each time. The transition between the base 17 of the bore
and the wall l9~of the bore is rounded off at 18 so that the
outflowing heating liquid produces as little noise as possible.
The inlet connection piece converges directly adjoining the
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external screwthread 11, on the one hand by a projection 20 and on
the other by a cone 21. Since the inlet connection piece 9
projects to a certain extent into the screw-in socket 2, one
thereby ensures that it will not excessively impede the outflowing
heating liquid.
The closure element 13 is secured to a shank 22 which can be
pressed with the aid of pin 32 onto t:he valve seat 12 against the
force of a spring 23. The pin 32 ins actuated by a thermostatic
valve attachment (not shown) which c<~n be secured to a neck 27 of
the shaft carrier 7 of the valve insert 6.
As is usual, the valve insert 6 has ~;ecured to it a securing ring
24 having a lug 37 engaging in a groove 25 of the screw-in
socket 2.
The valve closure, element 13 is surrounded by a pre-setting insert
14 which is rotatable about the longitudinal axis of the valve
with the aid of a setting element ;Z6. It can be driven by a
knurled wheel 29 which is pulled upw~~rdly against the force of a
spring 28 so that its teeth 30 engage with corresponding teeth 38
of the setting element 26. In other respects, the construction of
the actuating device of the setting ~slement is as shown in DE-PS
33 00 624.
The pre-setting insert 14 has a skirl: which is circumferentially
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chamfered relatively to a plane perpendicular to the longitudinal
axis of the valve. Thus, when the pre-setting insert is turned,
it closes the outlet aperture 10 to a greater or smaller extent.
This enables one to determine the maximum throughflow for the
heating liquid.
Depending on the length of the screw-in socket 2, the inlet
connection piece 9 projects into the supply passage to a larger or
smaller extent. Nevertheless, the elements necessary for
actuating the valve closure member 13 and the elements necessary
for actuating the pre-setting insert 14 will always have the same
relatively short structural length. Although the heating liquid
might therefore have to traverse a somewhat longer path, the
latter is not impeded by the valve insert housing 6 because the
flat 15 makes an adequate discharge cross-section available
between the valve insert 6 and screw-in socket 2.
sg/lcd
