Improvements in Valves for Hydraulic Lifts and other Hydraulic Apparatus.
Year: 1895

page_text: Date of Application, 3rd Jan., 1895-Accepted, 9th Feb., 1895
COMPLETE SPECIFICATION.
Improvements in Valves for Hydraulic Lifts and other Hydraulic
Apparatus.
I, ARNOLD GOODWIN, of 56 Sumner Street, Southwark, in the County of
Surrey, 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 valves for controlling the passage of
water under pressure to and from the ram cylinders of hydraulic lifts and other
hydraulic apparatus and it has for objects to obviate the use of moving packing
leathers, which are liable to turn or roll back upon themselves when in use and so
become inoperative, and also to prevent shocks being caused by sudden and complete
opening and closing of the ports controlled by the valve.
For these purposes I construct a valve in the improved manner I will now proceed
to explain by reference to the accompanying drawings wherein,
Fig. 1 is an elevation, and
Fig. 2 a vertical section on the line a b of Fig. 1 showing a hydraulic valve
according to this invention.
The valve casing is made in three parts 1, 2 and 3 provided respectively with
short flanged branch pipes 1, 2 and 3" of which 1ª is adapted to be placed in
communication with an accumulator or other source of water under pressure,
2ª with the cylinder fitted with the ram to be operated by hydraulic pressure, and
3ª with the exhaust. 4 is the valve proper in the form of a tube arranged to slide
longitudinally within the valve case through suitable packing leathers 5 and 6
which are held in annular recesses formed by and between the parts 1 and 2 and the
parts 2 and 3 respectively of the valve case. The valve 4 is connected at one end
to a valve operating rod 7 that works through a packing leather 8 held in place in
the end of the valve case by a gland 8. The other end of the valve is closed by a
screw plug as shown. The valve, which may be reciprocated in any suitable
manner through its rod 7, is formed with two sets of apertures 10, 10ª at such a
distance apart that when the valve is in one of its two extreme positions all the
apertures in each set will be uncovered and communication will be established
between the source of pressure and the ram cylinder by way of the branch 1ª, the
apertures 10, the interior of the valve, the apertures 10" and the branch 2; that
when the valve is in its central position, communication between both the source of
pressure and the exhaust and the cylinder of the ram will be cut off, the sets of
apertures 10 and 10ª being then located between the packing leathers 5 and 6; and
that when the valve is moved into its other extreme position, the apertures 10
and 10 will be uncovered and communication will be established between the ram
cylinder and the exhaust by way of the branch 2ª, the apertures 10, the interior of
the valve, the apertures 10" and the branch 3*.
In order that the opening and closing of the communication between the
branches 1, 2 and 38 shall take place in a gradual manner and thus avoid shock,
the apertures composing each set 10, 10" are arranged at different points lengthwise
of the valve so that they will be opened or closed in succession instead of simul-
taneously. For this purpose the apertures in each set may advantageously be
pitched in a spiral manner as shown.
As will be evident valves according to my invention may be constructed in
various forms.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A hydraulic valve in which the valve proper is arranged to slide through
packing leathers fixed within a valve case having inlet, outlet and exhaust branches,
and is made hollow and provided at different parts of its length with sets of
apertures for placing one branch in communication with another through the
hollow valve, the apertures in each set being arranged at different points in
the length of the valve so as to be opened and closed in a successive manner
when the valve is operated, substantially as hereinbefore described for the
purpose specified.
2. The improved hydraulic valve, constructed, arranged and operating substan-
tially as hereinbefore described with reference to and shown in the drawings
annexed.
Dahi ond Tom 2005
ARNOLD GOODWIN.
W. Lloyd Wise.
46, Lincoln's Inn Fields, London, W.C., Applicant's Agent.