Improvements in or in connection with Working Valves, specially applicable for Hydraulic Purposes.
Year: 1896

page_text: Date of Application, 30th June, 1596-Accepted, 5th Sept., 1896
COMPLETE SPECIFICATION.
Improvements in or in connection with Working Valves, specially
applicable for Hydraulic Purposes.
I HENRY BARRY of Croydon Works Hunslet Leeds in the County of York
Hydraulic 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 refers to improvements in or in connection with working valves,
specially applicable to hydraulic purposes, in connection with which they are for
the sake of illustration more particularly hereunder described; though it will be
evident that they are also applicable to air steam and gas purposes where similar
or analogous conditions or purposes are present.
For the sake of brevity and clearness, reference will be at once had to in the
following description to the accompanying drawings.
Fig. 1 is a plan and Figs. 2 and 3 are vertical sections, on lines A. A and B B
respectively of Fig. 1, of a working valve suitable for hoist purposes, where the
load has to be lowered, as for example in shipping coal. a is an inlet passage to
the valve box from the accumulator, and a' is an outlet passage from the valve box
to the accumulator. c is an outlet passage from the valve box to the cylinder of
the hoist, and e' is an inlet passage from the hoist cylinder to the valve box. bis a
e is an auxiliary
passage connecting a and c, and d is a passage connecting a¹ and c¹.
or actuating valve for shutting off communication from the passage a to b, and fis
a clack or non return valve for shutting off communication from the passace e to b.
Similarly, g is an actuating valve for shutting off communication from the
passage c' to d, and h is a clack or non return valve from shutting off communication
from the passage a¹ to d.
i is a cam- or lifting spindle, and ; the hand lever for the same; the valves e
and g being on opposite sides of the spindle i.
The action of the valve is as follows.
The handle being raised in the direction shewn by the arrow in Fig. 2, raises
the valve e, admitting water from the accumulator. to the passage b. The water
forces the clack valve fupwards, and gains admittance to the passage e and thence
to the cylinder of the hoist, raising the unloaded platform. When the platform
is at the proper height, the handle is brought back into the horizontal position,
and the valves f and e fall on to their seats. The load is now run on to the hoist,
so that the back pressure from the hoist exceeds that in the accumulator. This
pressure would raise the valve e, but is prevented by the clack or non return valve f
As soon as the load is ready to be lowered, the handle is moved in the direction
indicated by the arrow in Fig. 3, raising the valve g and admitting the water from
the hoist cylinder through the passage to the passage d, and the water, having a
greater pressure than in the accumulator, forces up the valve h and returns along a¹
to the accumulator as the load descends.
The passages a al may be connected together, so as to require only one pipe to.
the accumulator; and likewise the passages c, c¹ so as to require only one pipe
to the hoist cylinder.
Fig. 4 is a plan and Figs. 5 and 6 are vertical sections, on lines C C and D D
respectively of Fig. 4, of a working valve for a double pressure; i.e. in which the
lower pressure is employed for filling the working cylinder and moving the plunger.
or piston rod up to its work, and higher pressure in completing the work, as for
a

page_text: example in hydraulic-rivetting and forging machines, aud in cotton presses where a
much greater pressure is required for the finishing part of the stroke.
I is a passage in communication with the low pressure reservoir, and 4 in con-
nection with the high pressure reservoir. c is the passage communicating with
the working cylinder, and e is the exhaust. a is a clack or non return valve, for
preventing the return of water from the chamber of the actuating valve 6 to the
low pressure inlet 1. d is an actuating valve for shutting off communication
between the high pressare inlet A and the passage n, which communicates with the
passage m. g is an actuating valve for closing the exhaust. The passages m and n
lead from the underside of the valves b and d to the upper side of the valve seat 9.
The actuating valves b and dare both on ene side of the spindle i, and the actuating
valve e is on the opposite side.
The working of the valve is as follows:-
The handle is moved to the position indicated by the dotted line L in Fig 6,
lifting the valve b, and allowing low pressure water to pass along the passages m
and c to the working cylinder. When the cylinder is filled, so that the piston or
plunger has been brought up to its work and the pressure is insufficient to move the
piston or plunger further, the water is in equilibrium on both sides of the valve a,
which drops on to its seat, and prevents the return of any water back through the
passage. The lever is moved further, into the position indicated by the line H,
and then but not until then the cam spindle i raises the valve d, admitting high
pressure water along the passages n and m to the cylinder through the passage c.
When the work of the working cylinder is completed, the lever j is moved back to
the horizontal position, the valves & and d then drop on to their seats closing com-
munication with the high and low pressure passages and l, and the same movement
or a continuation of the same movement of the lever to the position, say as indicated
by the dotted line E, raises the valve g opening communication between the cylinder
and the exhaust e.
Fig. 7 is a plan, and Figs. 8 and 9 are vertical sections, on lines E E and F F
respectively of Fig. 7, of a double acting working valve i.e. for admitting the
water or other fluid to both sides of the piston alternately, as for example in.
hydraulic cranes and hoists, where the load has to be raised.
a is the water inlet. is a passage communicating with the top of the working
cylinder, and is a passage communicating with the bottom of the same. e is the
exhaust. m is a passage connecting the underside of the valve h with the upper
side of the seat of the valve y. o is a passage connecting the underside of the
valve with the upper side of the seat of the valve d, and n is a passage connecting
the underside of the valve d with the exhaust passage e. All the four valves lg h
and d are actuating valves, h and d being on one and the same side of the cam-
or tappet spindle i, and I and g on the opposite side of the same.
The working of the valve is as follows:-
e
On moving down the handle j, the valve A is raised, admitting water from the
passage a to the passage m, then round the valve g to the passage b communicating
with the bottom of the working cylinder. The same movement of the lever j
also lifts the valve d, placing the top of the working cylinder in communication
with the exhaust e through the passages t and n. The valves and g being
down, the former shuts off communication between the inlet a and the passage o.
i.e. to the top of the working cylinder, and the latter between the exhaust and
the passage bi.e. the bo:tom of the working cylinder. On raising the lever j, the
valves and g are raised, opening communication, the former between the water
inlet a and the passages o and tie. the top of the cylinder, and the latter between
the passage bi.e. the bottom of the cylinder and the exhaust e; and at the same
time the valves h and d falling, shut off the former the passage m (to the bottom
of the cylinder) from the inlet a, and the latter the passage t, i.e. the top of the
cylinder, from the passages n and e i.e. to the exhaust.
Lastly my invention comprises a new or improved construction of automatic.
valve for use with a hydraulic intensifier. This is shewn in vertical section in

page_text: Fig. 10. a is the inlet from the accumulator. c is a passage communicating with
the working cylinder. i is a passage communicating with the hydraulic intensifier.
e is the exhaust passage. p'is a passage communicating with a supply of water
under a constant pressure. d is a clack or non return valve, closing communication
between the passages a and c. g is a combined piston valve and valve seat, and
sois a combined piston and valve, the valve o closing at the proper times on to the
valve seat formed by the lower inner edge of the hollow piston valve g.
small holes in the upper end of the valve g establishing a restricted communica-
tion between the interior and exterior of the valve. The diameter of the piston s
is less than that of the valve o, and the latter less than that of the piston
valve g.
The action of the valve is as follows. Prior to admitting water from the
accumulator, the pressure on the naderside of the piston a forces the valves dg.
and o into the positions shewn in Fig. 10; in which a is in communication with the
cylinder, and the intensifier in communication with the exhaust. On admitting
water from the accumulator through a, the water passes under and round the
valve d to the working cylinder through the passage c. When the piston of the
latter has moved as far as the accumulator pressure will force it, the back
pressure from the cylinder accumulates on the top of the valve g to the accumulator
pressure, which suffices to force down the valve g on to its seat, shutting off
communication between the intensifier and exhaust passages, i.e. between i and e;
and afterwards as the water forces its way through the openings n, increasing the
pressure inside g, the valve o is pushed back from its seat (forcing back the
piston s) establishing communication between the intensifier and accumulator
passages i and a, thus admitting automatically at the proper time water from the
accumulator to the intensifier. "During this time the establishment of equilibrium
round the valve d permits the latter to drop on to its seat, and shuts off com-
munication between the cylinder passage c and the rest of the valve. When the
communication between the passage a and the accumulator is closed, and the
passage a is placed in communication with the exhaust by means of a working
valve, the constant pressure on the piston s first closes up the valve o, then lifts
the valves g and d, first placing the intensifier in communication with its exhaust,
and afterwards the cylinder through its passage with its exhaust.
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. For hoist and similar purposes the construction and arrangement of valve or
valves comprising a double pair of actuating and clack valves f, e, and gh, each
pair connected on their under sides by a passage b and d respectively, the actuating
valves e and g being respectively on opposite sides of a common cam or
tappet spindle i, substantially as herein set forth and illustrated in Figs. 1, 2
and 3.
2. The construction and arrangement of a double pressure valve or valves
comprising three actuating valves ba and g, the two former on one and the same
side and the latter on the opposite side of a common cam or tappet spindle i, and
one clack valve a, with high and low pressure inlets h and 1, cylinder, communi-
cating, and exhaust passages c, m, n and e respectively, all substantially as herein
set forth and illustrated in Figs. 4, 5 and 6.
3. The construction and arrangement of double acting valve or valves comprising
four actuating valves h d, and land g, the two former on one and the same side of
the common cam or tappet spindle i and the two latter on the opposite side thereof,
and the valve chambers of d and 9 in communication with the top and bottom
cylinder passages and respectively, with inlet exhaust and connecting
passages a, e, nm and o respectively, all substantially as herein set forth and
lustrated in Figs. 7, 8 and 9.
1. The construction and arrangement of automatic valve or valves for use in

page_text: connection with hydraulic or other intensifiers comprising a clack valve d perforated
combined hollow piston valve and valve seat g and combined piston and valve so,
the piston chamber in communication with a source of constant pressure the valve
chamber in communication with the intensifier and with an exhaust e, the two sides
of the piston valve g respectively in communication with accumulator and exhaust
passages (a and e), and the top and bottom of the clack valve seat respectively
in communication with the cylinder and accumulator passages c and
substantially as herein set forth and illustrated in Fig. 10.
all
5. My improved valves constructed arranged and operated substantially as herein
-set forth and illustrated in the accompanying drawings.
Dated this 27th day of June 1896.
J. CLARK JEFFERSON,
30 Park Row, Leeds, Agent for Applicant.