Improvements in Valves for Operating Hydraulic Machinery.
Year: 1896

page_text: Date of Application, 13th July, 1896
Complete Specification Left, 26th Oct., 1896-Accepted, 5th Dec., 1896
PROVISIONAL SPECIFICATION.
Improvements in Valves for Operating Hydraulic Machinery.
I, EDWARD CECIL BARTLETT of 58, Lansdowne Road, London, W. in the County
of Middlesex, Civil Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to that class of hydraulic machinery, in which the motion of
a piston within a cylinder is controlled by a slide valve, and is especially applicable
for operating sluice valves, presses and other similar apparatus.
I shall describe my invention by reference to the apparatus employed in opening.
and closing sluice valves.
In the majority of apparatus for operating sluice valves as heretofore constructed
the water admitted below the piston has been allowed to escape directly into the
exhaust. By my invention I allow the water which has performed the operation of
raising the piston, to flow during the descent of the same into the space above the
piston. When the piston has descended and the water has filled or nearly filled the
space above it, the final pressure required to close the sluice valve completely is
obtained by admitting the water pressure above the piston.
The special feature of my invention is the valve which controls the flow of water
to the two sides of the piston. The exhaust port is preferably rectangular, whereas
the admission ports are arranged on either side of the exhaust port and are triangular
in shape, the vertices of the triangles being further removed from the exhaust port.
On the valve face I arrange a D valve provided with two ports rectangular in section,
with a passage connecting them. The lengths of the ports in the D valve are equal
to the distance from the base of the triangular admission port to the nearer edge
of the exhaust port, and the distance between the outer edge of the face of the
D valve from the nearest port is equal to the length of the admission port, that is to
the distance from the vertex to the base of its triangular section.
The ports in the D valve are at such a distance apart that when the D valve is
in its central position, it places the admission ports in communication.
The hydraulic pressure is admitted into a valve box, within which the D valve.
slides, the valve rod working in a stuffing box and being controlled by suitable
mechanism.
The mode of operation is as follows-Suppose the sluice valve is shut, that is, is
in its lowest position. The sluice valve has now to be opened, and on raising the-
D valve pressure will be admitted below the piston and the sluice valve will open, the
When it is desired
upper admission port being in communication with the exhaust.
to close the sluice valve, the D valve is lowered into its central position, thus connect-
ing the upper and lower portions of the cylinder, which are at this moment
unconnected with either pressure or exhaust. The weight of the sluice valve will
then cause the piston to descend, driving the water from below it into the space above
it. On further lowering the D valve, the lower portion of the cylinder is connected.
to the exhaust, and the pressure is admitted to the upper portion of the cylinder,
which is already full of water, and a complete and effectual closing of the valve will
result, without that waste of water, which has hitherto taken place.
2000
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page_text: Improvements in Valves for Operating Hydraulic Machinery.
I, EDWARD CECIL BARTLETT, of 58, Lansdowne Road, London, W. in the County
of Middlesex, Civil Engineer, 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 invention relates to that class of hydraulic machinery in which the motion of
a piston within a cylinder is controlled by a slide valve and is especially applicable for
operating sluice valves and gates.
I shall describe my invention by reference to the apparatus employed in opening
and closing sluice valves.
In the majority of apparatus for operating sluice valves as heretofore constructed,
the water admitted below the piston has been allowed to escape directly into the
exhaust. By my invention I allow the water which has performed the operation of
raising the piston to flow during the descent of the same into the space above the
piston. When the piston has descended and the water has filled or nearly filled the
space above it, the final pressure required to close the sluice valve completely is
obtained by admitting the water pressure above the piston.
The special feature of my invention is the valve which controls the flow of water
to the two sides of the piston.
The drawing shows in Fig. 1. a section on the centre line of slide valve and valve
box and in Fig. 2. a plan of the top of valve box.
The exhaust port E, is preferably rectangular and the admission ports P. P. are
arranged on either side of the exhaust port, and may be triangular in shape, the
vertices of the triangles being furthest removed from the exhaust port. On the valve
face I arrange a D valve (A.), provided with two ports rectangular in section, with
a passage connecting them. The lengths of the ports in the D valve are equal to the
distance from the base of the triangular admission port to the nearer edge of the
exhaust port, and the distance between the outer edge of the face of the D valve from
the nearest port is equal to the length of the admission port, that is to the distance
from the vertex to the base of its triangular section. The ports in the D. valve are at
such a distance apart that when the D. valve is at its central position, it places the
admission ports in communication.
The hydraulic pressure is admitted through the supply port S. into a valve box B..
within which the D. valve slides, the valve rod R. working in stuffing boxes C. C. and
being controlled by suitable mechanisın.
The mode of operation is as follows:-Suppose the sluice valve is shut, i.e. is at its
lowest position. The sluice valve has now to be opened and on raising the D. valve
pressure will be admitted below the piston, and the sluice valve will open, the upper.
admission port being in communication with the exhaust. When it is desired to close
the sluice-valve the D valve is lowered into its central position, thus connecting the
upper and lower portions of the cylinder, which are at this moment unconnected with
either pressure or exhaust. The weight of the sluice valve will then cause the piston to
descend driving the water from below it into the space above it. On further lowering
the D. valve, the lower portion of the cylinder is connected to the exhaust, and the
pressure is admitted to the upper portion of the cylinder, which is already full of
water, and a complete and effectual closing of the valve will result, without that waste
of water which has hitherto taken place.
Having now particularly described and ascertained the nature of my said: inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
(1.) In valves for operating hydraulic machinery the employment of Dvolve

page_text: adapted during the descent of the piston to close the exhaust port and place the portions
of the cylinder above and below the piston in communication substantially as and for
the purposes described.
(2.) In valves for operating hydraulic machinery the employment of a D. valve
adapted to transfer water from the lower to the upper portion of the cylinder during
the descent of the piston, substantially as and for the purposes described.
(3.) In valves for operating hydraulic machinery the combination of triangular
pressure ports with a valve adapted to place the upper and lower portions of the
cylinder in communication during the descent of the piston substantially as and for
the purposes described.
(4.) The combination of means for transferring the water from the lower to the
upper surface of the piston with means for applying the full pressure requisite to
drive the valve home substantially as described.
E. C. BARTLETT.