Improvements in or relating to Cocks or Valves.
Year: 1899

page_text: Date of Application, 24th May, 1899-Accepted, 12th Aug., 1899
Improvements in or relating to Cocks or Valves.
I, DESIRE DALOZE, of Marchienne-au-Pont, in the Kingdom of Belgium,
Mechanician, do hereby declare the nature of this invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:—
My system of valve can be applied to ordinary cocks with two, three or four
passages, as shewn in the accompanying drawings. My improved valve can be
used in place of cocks now used for hydraulic, atmospheric, and steam pressure
and the like.
Many valves after a certain period of working require repairing or in the case
of a cock, can not act any longer.
Referring to the accompanying drawings Fig. 1 is an elevation of the valve,
Fig. 2 a view at right angles to Fig. and Fig. 3 a diagram shewing a form of
hydraulic brake which can be operated by the said valve.
The entrance C (Figure 1) of my valve is divided into two apertures A and B
thus allowing the pressure to communicate with the top and bottom of the plug
which renders the counter-pressure equal, and by this means the plug I will
always act without ever breaking; it possesses equal play, whilst with an ordinary
cock it is often necessary to turn the plug about; as if this is not done the plug
becomes wedged and cannot be further used without wrenching the tap which
frequently causes the stem of the plug to break.
The distribution is regulated chiefly by these two apertures placed at the
principal entrance. My invention is characterised by the distribution of the
passages of the plug, as if these passages are not in connection with the prin-
cipal entrance C and the exhaust opening G, the piston in the cylinder cannot
act. All valves constructed up to now have no apertures A and B and once the
plug is broken the result is frequently an escape of steam and the like. By means
of these apertures the counter pressure being equal on both sides, the plug always
works very easily and is unbreakable.
The accompanying drawing illustrates an example of my valve applied to the
brake of any kind of locomotive (see Figure 3), especially for station engines
where the brake is most often used. When my valve is fitted to the locomotive
I place a steam cylinder on the bed-plate of the engine in the place of the open-
ings for operating the brake, the handle of my piston replacing the opening,
then a communication is effected between the valve and cylinder by means of
pipes conducting the steam.
As the plug is shewn, the steam enters through C into E by means of the
aperture F in the plug D and passing directly to the cylinder raises the piston,
presses the brake-blocks against the wheels and the steam or atmosphere stored
in the cylinder exhausts through the opening H. This aperture is in communi-
cation with the aperture F of the plug corresponding with the exhaust opening,
from which it results that in placing the aperture F in C H and the aperture F
in E G, the pressure will cause the piston to fall and will withdraw the brake-

page_text: blocks from the wheels and the steam will return into E G to the exhaust (see
Figure 2, plan view).
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
--
A cock or valve provided with two apertures communicating with the entrance
for the pressure, and forming a passage on the top and bottom of the plug for
the purpose of counterbalancing the pressure substantially as described above
and illustrated in the accompanying drawings.
Dated the 24th day of May 1899
W. P. THOMPSON, & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.