Improvements in or relating to Plug Cocks for Hydraulic Ash Ejectors, and for other Purposes..
Year: 1898

page_text: Complete Specification Left, 12th Dec., 1898-Accepted, 18th Feb., 1899
PROVISIONAL SPECIFICATION.
Improvements in or relating to Plug Cocks for Hydraulic Ash
Ejectors, and for other Purposes..
We, FRANCIS JAMES TREWENT, Naval Architect, and WILLIAM EDWARD PROCTOR,
Engineer, both of 43, Billiter Buildings, Billiter Street, in the City of London, do
hereby declare the nature of this invention to be as follows:
This invention relates to plug cocks and has for object to provide an improved
construction of plug cock more particularly adapted for use as a substitute for the
ordinary valve or cock in the ejector pipe of hydraulic ash ejectors such as those
described in the Specification of Letters Patent No. 11135 of 1897.
When an ordinary valve or cock is employed in the ejector pipe of the hydraulic
ash ejector above referred to, and the valve or cock is closed with more or less
suddenness, a water-hammer action of considerable force is produced with the
result of jarring the pipes, and straining or starting the joints of the connected
parts of the apparatus.
Now the present invention has for its main object an improved construction of
plug cock which may be closed suddenly without the production of water-
hammer" and consequently without the disagreeable and damaging jarring above ·
referred to.
With this object the plug of the improved cock, in addition to having the usual
wide through-bere or passage-way is formed with a smaller lateral aperture in
the closing side or wall of the plug.
The plug is further formed with a relief opening or passage leading from the
usual bore into the atmosphere or into a suitable discharge pipe. The said relief
opening is normally closed by a spring-pressed valve.
The arrangement of the parts is such that when the cock is open, that is to say,
when the cock plug is in a position in which it allows of water passing through
its bore from the inlet to the delivery side of the cock, the aforesaid spring-pressed
valve will be closed, but when the cock is closed by the plug being turned so as to
cut off the passage of water through its hore, the aforesaid lateral aperture in the
closing side or wall of the plug will consequently be brought into coincidence with
the inlet passage of the cock casing, so that the water on being shut off instead
of impinging violently against the solid wall of the closed plug as is the case
in ordinary plug cocks, and thereby producing water-hammer" and jarring
of the supply pipe, will pass through the said lateral aperture in the closing
wall of the plug, into the bore of the plug where it will expend its momentum in
forcing open the spring-pressed valve above referred to. By this means a relatively
small quantity of water will pass out through the relief opening, thereby reducing
the momentum of the water, the valve being closed again by the action of its
spring.
The moving body of water in the supply pipe will thus be brought to rest
gradually without jar or noise.
In a form of construction particularly designed for use in the hydraulic asli-

page_text: ejector herein before referred to, the spring pressed valve is an ordinary metal lift
valve arranged to be opened against the action of a coiled spring encircling a guide
tube bearing against or fixed to the valve. By forming one or more holes in the
end of the said guide tube nearest the valve and by arranging a cup leather or other
suitable packing between the said holes and the bearing washer of the spring the
water passing out through the relief opening past the open valve, will be led
through the guide tube to any desired point of discharge, thereby avoiding contact
with and consequent rusting of the spring, and the slopping of the adjacent parts.
When a cock plug of this kind is designed for use with the ejector nozzle
of the hydraulic ash ejector herein before referred to the device becomes a combined
cock nozzle and escape valve and it is preferred to construct the delivery side of
the cock in the form of the said ejector nozzle, the connecting passage through the
cock being made conical and there being a clear sweep right through the cock
casing and plug from the wide connection to the donkey or force pump at the
inlet end to the smaller nozzle outlet at the delivery end of the cock.
Dated this 10th day of March 1898.
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.
.
Improvements in or relating to Plug Cocks for Hydraulic Ash
Ejectors and for other Purposes.
We, FRANCIS JAMES TREWENT, Naval Architect, and WILLIAM EDWARD PROCTOR,
Engineer, both of 43, Billiter Buildings, Billiter Street, in the City of London, do
hereby declare the nature of this invention and in what manner the same is to he
performed, to be particularly described and ascertained in and by the following
statement:
-
This invention relates to plug cocks and has for object to provide an improved
construction of plug cock more particularly adapted for use as a substitute for the
ordinary valve or cock in the ejector pipe of hydraulic ash ejectors such as those
described in the Specification of Letters Patent No. 11135 of 1897.
When an ordinary valve or cock is employed in the ejector pipe of the hydraulic
ash ejector above referred to, and the valve or cock is closed with more or less
suddenness a water-hammer" action of considerable force is produced with the
result of damaging the pump or jarring the pipes and straining or starting the
joints of the connected parts of the apparatus.
<
Now the present invention has for its main object an improved construction of
plug cock which may be closed suddenly without the production of water-
hammer" and consequently without damaging the pump or producing the
disagreeable jarring above referred to. The improved construction has the further
advantage that when the cock is closed and the pump is started the water will
commence to escape as soon as the pressure is attained at which it is desired to
work the ejector. An indication is therefore given without the necessity of
examining the pressure gauge.
With this object the plug of the improved cock in addition to having the usual
wide through-bore or passage-way is formed with a smaller lateral aperture in
the closing side or wall of the plug.
The plug is further formed with a relief opening or passage leading from the
usual bore into the atmosphere or into a suitable discharge pipe. The said relief
opening is normally closed by a spring-pressed valve.
-
The arrangement of the parts is such that when the cock is open, that is to say,

page_text: when the cock plug is in a position in which it allows of water passing through
its bore from the inlet to the delivery side of the cock, the aforesaid spring-pressed
valve will be closed, but when the cock is closed by the plug being turned so as to
cut off the passage of water through its bore, the aforesaid lateral aperture in the
closing side or wall of the plug will consequently be brought into coincidence with
the inlet passage of the cock casing, so that the water on being shut off instead
of impinging violently against the solid wall of the closed plug as is the case
in ordinary plug cocks, and thereby producing "water-hammer" and damaging the
pump and jarring and the supply pipe, will pass through the said lateral aperture
in the closing wall of the plug, into the bore of the plug where it will expend its
momentum in forcing open the spring-pressed valve above referred to. By this
means a relatively small quantity of water will pass out through the relief opening,
thereby reducing the momentum of the water, the valve being closed again by the
action of its spring.
The moving body of water in the supply pipe will thus be brought to rest
gradually without jar or noise.
When the pump is started to work the ejector the cock being then closed the
relief valve will be slightly opened by the water pressure as soon as this attains the
pressure required to work the ejector and will thus allow some of the water to
escape and give an indication that such pressure has been attained.
The spring pressed valve is preferably an ordinary metal lift valve arranged to
be opened against the action of a coiled spring preferably made of phosphor bronze
or other suitable non-corroding or non-rusting metal.
Should it be required to use a steel spring, the coiled spring would in that case.
encircle a guide tube bearing against or fixed to the valve. By forming one or
more holes in the end of the said guide tube nearest the valve and by arranging
a cup leather or other suitable packing between the said holes and the bearing
washer of the spring the water passing out through the relief opening past the
open valve, will be led through the guide tube to any desired point of discharge,
thereby avoiding contact with and consequent rusting of the spring, and the
slopping of the adjacent parts.
When this plug cock is used with the ejector nozzle of the hydraulic ash ejector
hereinbefore referred to the device becomes a combined cock nozzle and escape or
relief valve and it is preferred to construct the delivery side of the cock in the form of
the said ejector nozzle, the connecting passage through the cock being made conical
and there being a clear sweep right through the cock casing and plug from the
wide connection to the donkey or force pump at the inlet end to the smaller
nozzle outlet at the delivery end of the cock.
The accompanying drawings illustrate a plug cock constructed according to this
invention and designed for use with the ejector nozzle of the hydraulic ash ejector
hereinbefore mentioned. Figure 1 is a section taken in a plane passing through the
longitudinal axes of the plug and cock casing.
Figure 2 is a separate view on a smaller scale showing the cock plug in cross
section on the line 2-2 of Figure 1 looking from the large end of the plug.
In these figures, A is the cock casing, B is, the cock plug which in addition to
having the usual wide through-bore or passage way B₁ is formed with a smaller
lateral aperture C in the inlet closing side or wall of the plug. The plug B is
further formed with a relief opening or passage D leading from the usual bore 131
and normally closed by an outwardly-opening metal lift valve E. This valve E
is arranged to be opened against the action of a coiled spring which is made of
phosphor bronze or other non-corroding or non-rusting metal and which is loaded
to a greater pressure than the working pressure of the ejector. The plug is packed
and held in place in its casing by means of a stuffing box packing and gland G
through which extends the cylindrical shank 132 of the plug B. A lever or handle H
is mounted on the outer end of the shank and serves for turning the plug B.
The shank 12 is made hollow to receive the coiled spring F which encircles
the stem I of the valve E and which bears at one end against a shoulder J formed

page_text: on the valve. At its other end the coiled spring bears against a flanged ring or
washer K supported by an annular part I which screws into the outer end of the
shank B2 and also provides a guide M for the valve stem I. In the annular part I
is screwed a bib N.
The recess A¹ formed in the casing A to receive the small end of the plug B is
made close-ended, and in its end there is fitted a screw or bolt 0. The small end of
the plug is cut away in part so as to form shoulders P, which, by coming in contact
with the head O¹ of the bolt O, serve to prevent the cock plug being turned in the
wrong direction, that is to say, these shoulders will only allow the cock plug to be
either opened as shown in the figures, or closed with the lateral aperture C situate
next to the inlet end of the cock. In the former or open position the relief
valve E remains closed as shown in the figures. But when the cock is closed by
the plug B being turned through 90° from the position shown, and so as to cut
off the passage of water from the inlet passage A2 of the cock to the outlet
passage A, the lateral aperture C will be brought into coincidence with the inlet
passage A² so that the water on being shut off, instead of impinging violently
against the solid wall of the closed plug as in ordinary plug cocks, and thereby
producing water-hammer will pass through the said aperture C into the bore B
of the plug B where it will expend its momentum in forcing open the relief valve E
against the force of the coiled spring F. By this means a small quantity of water
will pass out through the relief passage 1), thereby reducing the momentum of the
water when the water has been brought to rest, the valve E will be closed again
by the spring F. The water which has passed the valve E will flow through the
hollow shank 1, ring K, annular part L and bib N, into any convenient receptacle
without slopping.
*
In the arrangement shown the delivery side of the cock is fitted with the ejector
nozzle Q, the connecting passage through the cock being made conical and there
being a clear sweep right through the cock casing and plug from the wide con-
nection to the donkey or force pump at the inlet end A to the smaller nozzle
outlet at the delivery end A3 of the cock.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. A plug cock for hydraulic ash ejectors in which the cock plug, in addition to
having the usual wide through-bore or passage way, is formed with a smaller
lateral aperture leading into the usual bore through the inlet closing side or wall
of the plug and in which there is a relief opening or passage leading from the
usual bore and normally closed by a spring-pressed valve, the lateral aperture
in the plug coinciding with the said relief opening when the cock is closed,
substantially as described and for the purposes specified.
2. For use in connection with hydraulic ash ejectors the combination of the
nozzle Q, plug B and relief valve E, all constructed, arranged and operating
substantially as described and shown in the accompanying drawings.
Dated this 12th day of December 1898.
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.