IMPROVEMENTS IN SLIDE VALVES FOR STEAM, HYDRAULIC, AND OTHER MECHANISMS
Year: 1879

page_text: LETTERS PATENT to John Nicholson Holliday, of Sunderland, in the County of
Durham, Engineer for the Invention of "IMPROVEMENTS IN SLIDE VALVES FOR
STEAM, HYDRAULIC, AND OTHER MECHANISMS."
Sealed the 5th March 1880, and dated the 10th September 1879.
T
PROVISIONAL SPECIFICATION left by the said John Nicholson Holliday
at the Office of the Commissioners of Patents on the 10th September
1879.
JOHN NICHOLSON HOLLIDAY, of Sunderland, in the County of Durham,
Engineer. "IMPROVEMENTS IN SLIDE VALVES FOR STEAM, HYDRAULIC, AND
OTHER MECHANISMS."
The object of this Invention relates to steam and hydraulic engines, steam and
hydraulic steering apparatus, steam and hydraulic hammers, steam and hydraulic
reversing gear for marine and stationary engines. It can also, for instance, be
applied to steam and hydraulic hoists, and is especially adapted to do work where
power is required to lift and maintain the same; also to steam steering apparatus,
reversing gear, and pumping purposes in general.
To accomplish this, slide valves are employed, viz., sliding block (and box
valve.
The face of steam cylinder is,made in the ordinary manner, with one exhaust
port and two steam ports, and in addition to these, I employ two auxiliary steam
ports, which communicate vice versa with steam ports. The sliding block is
constructed with three ports, the ports on face side being wider than those on the
back, and allowing steam and exhaust a clear passage and full pressure of steam to
bear on piston at any part of the cylinder. On the back of the sliding block I
employ a box valve, with just sufficient lap to cut the steam off entirely from the
ports of the sliding block.
The exhaust of the box valve closes the same time as it shuts the steam off the
sliding block, causing the steam in the cylinder to be locked in. This is the method
used for steam and hydraulic steering apparatus, hydraulic hoists, etc. When used
for pumping engines, the exhaust is left open, so that the steam that is enclosed in
the cylinder may work expansively. The nut of the screw bar is attached
'

page_text: to the cross head or plug rod, and the box valve is worked with weigh bars. and
tappets.
In rotary engines, where the motion is required to be regular, the eccentric is
attached to the box valve in the ordinary manner. The sliding block is moved for
cutting off the steam with a quick-screw bar attached with a nut to crosshead of
piston rod.
When applied to steam steering apparatus, hoists, reversing gear, and
steam hammers, the nut of the screw bar. is fixed to cross-head, and the screw bar is
attached direct to sliding block, dispensing with cams, levers, eccentrics, etc.
The
box valve is moved by hand power, giving the operator perfect control in shifting
and retaining the same. The exhaust port opening through the slide block at the
same time as the steam is admitted past the end of the valve, causes the piston to
move to the distance the operator may require, causing the screw-bar to actuate the
sliding block, and cause the steam to be boxed in the cylinder as before. This
operation is carried out if required through the whole or any part of the stroke,
and vice versa. The steam in the cylinder when once charged is not emptied unless
the piston is required to travel the full length of the stroke. In the case of short
movements of the piston, the steam is let out through the exhaust valve in the
same proportion as the steam is admitted. In case of a load being suspended, as in
hoists or steam steering apparatus, when the steam condenses and the load slightly
falls back, the piston moves the screw-bar and slide block, which immediately
recharges itself, which brings it to the same point as before. The two auxiliary
ports are not required while the engine is working its regular stroke, but in case
a chain should break, as in the case of hydraulic hoists or steam steering apparatus,
or a spear should break in case of a pumping engine, the slide block moves
over the auxiliary port, admitting steam against the piston and cushioning the
same, and preventing any breakage.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Nicholson Holliday in the Great Seal Patent Office on the
10th March 1880.
JOHN NICHOLSON HOLLIDAY, of Sunderland, in the County of Durham
.Engineer. "IMPROVEMENTS IN SLIDE VALVES FOR STEAM, HYDRAULIC, AND
OTHER MECHANISMS."
The object of this Invention relates to slide valves for steam and hydraulic
' engines, steam and hydraulic steering apparatus, steam and hydraulic hammers,
steam and hydraulic reversing gear for marine and stationary engines.
'It can also, (for instance,) be applied to steam and hydraulic hoists, and is
especially adapted to do work where power is required to lift and maintain the
same, also to steam steering apparatus, reversing gear, and pumping purposes in
general.
To accomplish this, slide valves are employed, viz. -a sliding block valve, and a
box or jockey valve.
The face of steam cylinder is made in the ordinary manner, with one exhaust
port, and two steam ports, and in addition to these, I employ two auxiliary steam

page_text: ports, which communicate vice versa with steam ports. The sliding block is
coustructed with three ports, the ports on face side being wider than those on the
back, and allowing steam and exhaust a clear passage and full pressure of steam to
bear on piston at any part of the cylinder.
:
On the back of the sliding block I employ a box or jockey valve; with just
sufficient lap to cut the steam off entirely from the ports of the sliding block. The
exhaust of the box or jockey valve closes the same time as it shuts the steam off
the sliding block, causing the steam in the cylinder to be locked in. This is the
method used for steam and hydraulic steering apparatus, hydraulic hoists, &c.
When 'used for pumping engines, the exhaust is left open, so that the steam that is
enclosed in the cylinder may work expansively. The nut of the screw bar is
attached to the cross head or plug rod, and the box valve is worked with weigh
bars and tappets.. In rotary engines, where the motion is required to be regular,
the governor is attached to the box or jockey, valve in the ordinary manner. The
sliding block is moved for cutting off the steam with a quick screw bar attached
with a nut to cross-head of piston rod. When applied to steam steering apparatus,
hoists, reversing gear, and steam hammers, the nut of the screw bar is fixed to
cross head, and the screw bar is attached direct to sliding block, dispensing with
cains, levers, éccentrics, etc. The box valve is moved by hand, wheel, or lever,
attached to screw with right and left hand threads, working with one nut as a fixed
centre, and another nut fixed to the valve, giving the operator perfect control in
shifting and retaining the same. The exhaust port opening through the slide block at
the same time as the steam is admitted past the end of the valve, causes the piston
to move to the distance the operator may require, causing the screw bar to actuate
the sliding block which is either direct, radiating, oscillating, or circular, which
causes the steam to be boxed in the cylinder as before. This operation is carried
on if required through the whole or any part of the stroke, and vice versa. The
steam in the cylinder, when once charged, is not emptied unless the piston is
required to travel the full length of the stroke. In the case of short movements of
the piston, the steam. is let out through the exhaust valve in the same proportion
as the steam is admitted: In case of a load being suspended, as in hoists or steam
steering apparatus, when the steam condenses and the load slightly falls back, the
piston moves the screw bar and slide, and direct radial or circular block, which
immediately recharges itself and brings it to the same point as before. The two
auxiliary ports are not required while the engine is working its regular stroke, bu t
in case a chain should break, as in the case of hydraulic hoists or steam steering.
apparatus, or a spear should break in case of a pumping engine, the slide block
(direct, radial, or circular), moves over tha auxiliary port, admitting steam against
the piston, and cushioning the same, thus preventing any breakage.
A

page_text: A, main valve; B, jockey valve or slide; C and D, steam ports in cylinder ;
E, exhaust port; E, exhaust pipe; F, steam pipe; G and H, and auxiliary ports;
J, screw bar, which works the main valve (A), said screw bar being actuated by
nut n from the crosshead attached to piston rod; K, bar carrying jockey valve
or slide (B); L and L', right and left handed threads formed on the bar K; M,
lever to actuate the jockey valve. The screw thread L when action is applied,
screws out from the fixed cenntre (f), the screw L¹ travelling in and out, carrying
with it the slide or jockey valve. The action is as follows:-The lever, or hand
wheel M is moved, and the screws L and L' thereby actuate the jockey valve or
slide B, admitting steam through the main slide, thus causing the piston P to move
along with the crosshead and nut (n),attached to same, thereby actuating the main
slide A, to cut off or close the main valve A, at any part of the stroke. To bring
the piston back to centre or the full stroke, all that is required is to move the
hand wheel or lever to the required position, and the action is repeated. The
auxiliary valves G and H operate so that should any mishap should occur, the main
valve A will open the auxiliary ports to the main ports C and D, as shown by
dotted lines in Fig. 2.
In Figs. 9, 10 and 11, the action is the same as described, the difference being
that the main valve and jockey valve are arranged in circular form, the screws
being arranged to work same in a similar manner to that shown in Fig. 1. Figs. 12
and 13, arrangements in radial form, the main valve and jockey valve being actuated
in similar manner to those already described.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed or carried out in practice,
I hereby declare that I claim the Invention of "improvements in slide valves for
steam, hydraulic, and other mechanisms," substantially as herein before set forth and
described, in which Invention the adoption of a sliding block or valve, and a box
or jockey valve, for opening and shutting the ports to cylinder substantially, as
berein before set forth and described, and actuated substantially as herein before set
forth and described, and especially the construction of the openings in the sliding
block, so that the openings on the face towards the ports of the cylinder are
wider than those to the box or jockey valve, are particular and important points or
features.
In witness whereof, I, the said John Nicholson Holliday, have hereunto set
hand and seal, this Eighth day of March, in the year of our Lord One
thonsand night hundred and night
J. N. HOLLIDAY. (L.S.)
Witness,
T. MORGAN,
Secretary,
Inventors' Patentright Association, Limited,
21, Cockspur Street,
S:W.