Improvements in Valves for Hydraulic Apparatus
Year: 1898

page_text: Date of Application, 8th June, 1898
Complete Specification Left, 10th Apr., 1899-Accepted, 13th May, 1899
PROVISIONAL SPECIFICATION.
Improvements in Valves for Hydraulic Apparatus
We, JORGEN BJORNSTAD, Engineer, and EASTON, ANDERSON, & GOOLDEN, LIMITED,
both of Erith Iron Works, Erith, in the County of Kent, do hereby declare the
nature of this invention to be as follows
This invention relates to valves for hydraulic apparatus for controlling the
passage of the liquid under pressure to and from the rams or pistons working
in the cylinders of such hydraulic apparatus such for example as hydraulic litts
or cranes and it has for its puncipal objects to provide a valve which cannot
blow off its working face and which will not let down the lift ciane or other
apparatus in case of failure of the supply of the pressure water by fracture of
the supply main or from other causes and also to prevent the edges of the
packings of cup leather or other suitable materials being tuined or rolled back
so as to catch on the edges of the openings in the valve casing and also to produce
a gradual starting and stopping of the hydraulic apparatus by providing for the
gradual opening and closing of the passages controlled by the valve
The valve casing 18 preferably made in one piece provided with short flanged
or screwed branches respectively in communication with the source of liquid
under pressure with the hydraulic cylinder and with the exhaust
The valve reciprocates longitudinally in the casing and is made of metallic
pieces mounted upon the valve spindle and confining the packings or cup leatheis
between them, all being secured by a nut at one end pressing the parts together
and confining them between itself and an abutment at the other end of the
spindle. The packings or cup leathers have their outer lips forced inwards and
supported by metallic parts of the valve so that they cannot catch against the
edges of the ports when passing over them, holes being made in the said parts
of the valve to enable the liquid under pressure to gain access to the inside of
the cup leathers so as to force them outwards against the inner face of the valve
casing.
When the cup leathers pass the ports in the valve casing they are practically
in equilibrium as the pressure inside and outside the said leathers is the same
or nearly so and no great rush of liquid can take place as the metallic edges of
the valve have already cut off the greater part of the liquid
To prevent sudden opening and closing of the ports taper grooves are made
in the parts of the valve which pass over the ports in the casing. The valve
may be reciprocated by any suitable means through the end of the valve casing
and may be drawn out of the said casing for examination when the liquid 19
ent off without breaking the joints or disturbing the packing and all the packings
in the valve may be inspected without removing them from their position in
the valve
Valves may be constructed according to this invention in various forms and

page_text: they may be single acting or made with duplications of the parts to rendor
them double acting
Dated this 8th day of June 1898
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C, Agents.
Improvements in Valves for Hydraulic Apparatus.
We, JORGEN BJORNSTAD, Engineer, and EASTON, ANDERSON & GOOLDEN, LIMITED,
both of Erith Iron Works, Erith, in the County of Kent, 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 valves for hydraulic apparatus for controlling the
passage of the liquid under pressure, to and from the rams or pistons, working
in the ovlinders of such hydraulic apparatus such, for example, as hydraulic
lifts, or cranes; and it has for its principal objects to provide a valve which
cannot blow off its working face, and which will not let down the lift, crane, or
other apparatus, in case of failure of the supply of the pressure water by
facture of the supply main, or from other causes, and also to prevent the edges
of the packings of leather, or other suitable material, being turned, or rolled.
back so as to catch on the edges of the openings in the valve casing. We will
describe the invention more particularly with reference to the accompanying
drawings
Figures 1 and 2 represent a single-acting valve in two positions, and Figures 3
and 4 represent a double-acting valve in two positions In Figures 1 and 3 the
valves proper are shown in elevation and in Figures 2 and 4 they are shewn in
section
The valve casing A, is preferably made in one piece provided with short
flanged, or screwed, branches a, a, a, respectively in communication with the
source of liquid under pressure, with the hydraulic cylinder, and with the
exhaust
The valve B reciprocates longitudinally in the casing and is made of metallic
meces, mounted upon the valve spinille 18, and confining the packings
between them all being secured by a nut 4, at one end pressing the parts
together and confining them between itself and an abutment, at the other
end of the spindle The packings have their outer lips forced inwards, and
supported by metallic parts of the valves, as shewn clearly in the sections, so
that they cannot catch against the edges of the ports when passing over them,
holes d, being made in the said parts of the valve to enable the liquid under
pressure to gain access to the inside of the packings so as to force them outwards
against the inner face of the valve casing.
When the packings pass the ports in the valve casing they are practically in
equilibrium, as the pressure inside and outside the said packings is the same,
or nearly so, and no great ush of liquid can take place as the metallic edges of
the valve have already cut off the greater part of the liquid
The valve may be reciprocated by any suitable means through the end of the
valve-casing, and may be diawn out of the said casing for examination when the
quid is cut off without breaking the joints, or disturbing the packing, and all
the packings in the valve may be inspected without removing them from their
position in the valve
Valves may be constructed according to this invention in various forms, and

page_text: they may be single-acting as illustrated in Figures 1 and 2, or made with
duplications of the parts to render them double-acting, as shewn in Figures 3
and 4.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that
what we claim is:-
:―
1. A valve for hydraulic apparatus, the said valve consisting of a spindle on
which are mounted and secured metallic parts forming the body of the valve,
and confining the packings and forcing their lips inwards, substantially as,
and for the purpose, herein before described
2 Valves for hydraulic apparatus constructed substantially as, and for the
pui posas, hereinbefore descitbed, and illustrated, respectively, in Figures 1
and 2, and 3 and 4, of the accompanying drawings
Doted than 10th, dove
1900
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, WC., Agents