Improvements in Hydraulic Valves.
Year: 1891

page_text: Date of Application, 7th Oct., 1891
Complete Specification Left, 4th July, 1892-Accepted, 8th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Hydraulic Valves.
I, EDWIN DEARDEN, of Daisy Bank, Darnall, Sheffield, in the County of
York, Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in hydraulic valves for operating
bydraulic presses and it consists in a novel arrangement of water conduits between
the inlet and outlet ports or passages, and also of the rings of leather, or other
suitable material, used as packing for the closing of the passages.
Hydraulic valves have been and are now constructed having two or more rings
of leather, or other pliable material, some of which are placed in recesses in the
cylinder or barrel and the others in the centre part or spindle thereof, such
arrangements have the defect that the rush of water under the immense pressure
acting on the said rings is liable to destroy them.
In my improved valve I place all the said rings in the said cylinder or barrel
and I construct the central movable part or spindle with a cavity, or cavities, therein
to which the water enters through holes, also formed in the spindle, when these
holes are brought into correspondence with the inlet and exhaust ports or passages
in the barrel.
The effect of my improved construction of hydraulic valves is, that the smooth
surface of the spindle being in contact with the rings the latter are protected from
the rush and scouring effect of the water, particularly when the ports or passages
are open for the water to pass through.
Dated this Seventh day of October 1891.
COMPLETE SPECIFICATION.
Improvements in Hydraulic Valves.
I, EDWIN DEARDEN, of Daisy Bank, Darnall, Sheffield, in the County of
York, 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 :——
This invention relates to improvements in hydraulic valves for operating
hydraulic presses and it consists in a novel arrangement of water conduits between
the inlet and outlet ports or passages, and also of the rings of leather, or other
suitable material, used as packing for the closing of the passages.
Hydraulic valves have been and are now constructed having two or more rings
of leather, or other pliable material, some of which are placed in recesses in the
cylinder or barrel and the others in the centre part or spindle thereof; such
arrangements have the defect that the rush of water under the immense pressure
acting on the said rings is liable to destroy them.
In my improved valve I place all the said rings in the said cylinder or barrel
and I construct the central movable part or spindle with a cavity, or cavities,
therein to which the water enters through holes, also formed in the spindle, when
these holes are brought into correspondence with the inlet and exhaust ports or
passages in the barrel.
The effect of my improved construction of hydraulic valves is, that the smooth
surface of the spindle being in contact with the rings the latter are protected from
Pn.

page_text: the rush and scouring effect of the water, particularly when the ports or passages
are open for the water to pass through.
In order that my invention and its practical carrying out may be fully under-
stood I have illustrated it on the accompanying drawing which is a sectional view -
of the complete valve showing the casing or barrel A. having openings or passages
for water marked "Inlet " and." Exhaust" on the left hand side and for connection
to "Press" on the right hand side. The casing or barrel.is truly bored to receive
the three bushes C; these bushes have recesses formed to receive the packing
rings as shown; the ends of these bushes are coned to suit each other; each
end of the casing or barrel is chased or threaded to receive the collars D, which
are also coned to correspond with the bushes so that when screwed firmly home,
the joints at the ends of the said bushes are all secure against the leakage of
water from the passages. A number of holes F are drilled through the bushes
corresponding with the passages in the casing as shown.
The center spindle B is made to fit the bushes and is also perforated. with holes G
which when in position as shown coincide with those in the bushes and passages.
The holes in the spindle open into a cavity H-formed in the center part thereof so
that, as shown on the drawing, the water entering at the inlet may flow freely
round the bush and through the holes into the cavity and down to and through the
other holes to the passage to the press.
It will easily be seen that on the spindle being brought down the distance of one
passage to another, that the holes will then coincide with the passages from the
press and the exhaust and so complete the operation of one stroke of the valve.
Considering that the holes in the spindle have to pass through two of the packing
rings I have provided-metallic-linings to these as shown and with this provision-
make the rings of leather, gutta percha, or any suitable material.
I have drawn the center spindle with a portion removed to show if possible
more clearly the arrangement of the holes through the bushes to the water
passages.
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. A hydraulic valve constructed, combined and arranged to operate substantially
as hereinbefore described and illustrated on the accompanying drawing.
2. In a hydraulic valve, a spindle having a cavity or cavities through which the
water passes in its passage from the inlet to the press and from the press to the
exhaust in the manner substantially as hereinbefore described and shown on
the drawing.
Dated this Fourth day of July 1892.