Improvements in Valves for Hydraulic Apparatus.
Year: 1899

page_text: Date of Application, 30th Jan., 1899-Accepted, 4th Mar., 1899
COMPLETE SPECIFICATION.
Improvements in Valves for Hydraulic Apparatus.
I, ROBERT EDWIN PEACOCK CRAVEN, of Highthorn Villas, Armley, Leeds, in
he County of York, Engineer, do hereby declare the nature of this invention and
n what manner the same is to be performed, to be particularly described and
scertained in and by the following statement: —
This invention relates to improvements in valves for hydraulic apparatus and
as for object to obviate the wearing of the leather packing to ensure that the
working-face of the valve is always kept in contact with its seat, and to enable
the movement of the valve to be suitably controlled.
A single acting valve embodying these improvements is shown in Figs. 1, 2
and 3 of the accompanying illustrative drawings by way of example, Fig. 1 being
a sectional elevation of the valve and casing, Fig. 2 a horizontal section thereof
through the ports, and Fig. 3 a plan of the device for controlling the movement
of the valve.
The casing 1 is provided with a cylindrical valve chamber 2 into which opens
an inlet port 3, a supply port 4 communicating with the machine or apparatus,
and an exhaust port 5. In the example shown these ports pass through suitably
screwed bosses 6 provided with screwed coupling nuts 7, or such ports may pass
through ordinary coupling flanges.
In the valve chamber 2 and working against the cylindrical wall thereof, is the
valve suitably shaped at its central portion and provided with projections 9
to engage freely with a rectangular part 10 of the oscillatory spindle 11. This
spindle works in suitable bearings 12 and 13 screwed into the body or casing 1
and which serve to secure the leather packing 14 and 15 in position. 16 is a
removable bush or filling piece adapted to allow the valve to be inserted and
removed. The valve is not rigidly fixed to its spindle 11, but, whilst being capable
of receiving oscillatory movement therefrom, it can be normally pressed outward in
a radial direction by the pressure fluid, the spindle being maintained in equili-
brium.
In order that the valve may only be capable of turning within the required
limits the top end of the spindle 11, which is formed with a square 17 to receive
the end of a lever or other operating means, is provided with a collar 18 formed
with a radial projection 19 capable of oscillating with the spindle 11 between
stops 20, 21 formed by an upwardly extending rim 22, the arrangement being
such that when the valve shuts off supply and opens to the exhaust as shown in
Fig. 2, the face 23 of the projection 19 bears against the stop 20, see Fig. 3, and
when the valve is open, the face 24 is turned against the stop 21, so that the valve
cannot be turned into any position that would prevent pressure fluid acting upon
the back of the valve and pressing the latter against its seat.
The face 25 of the valve 8 is formed with a passage 26 connecting the port 4
leading to the machine with the exhaust port 5.
Fig. 4 shows by a similar view to Fig. 2, a valve of the kind hereinabove
described arranged in a casing provided with two ports 4 leading to the machine

page_text: or apparatus to be supplied, the valve in this case operating as a double-acting
valve.
Fig. 5 shows a valve of this kind suitable for use as a stop or relief valve, the
face 25 in this case being solid as shown.
Having now particularly described and ascertained the nature of the said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:
-
Valves for hydraulic apparatus constructed, arranged, and operating substan-
tially as hereinabove described with reference to and shown in Figs. 1, 2 and 3;
or arranged according to Fig. 4; or modified according to Fig. 5, of the accom-
|panying drawings.
panying drawings.
Dated this 30th day of January 1899.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.