IMPROVEMENTS IN VALVES to be as follows:-
Year: 1884

page_text: We FRANK MORRIS and CHARLES WATSON FOLKARD both of the Gas Works,
Brentford, in the County of Middlesex, Civil Engineers do hereby declare the
nature of our said invention for "IMPROVEMENTS IN VALVES to be as follows:-
"
This invention relates to valves adapted for intercepting the flow of either gas,
water, or other fluids, but are especially applicable for use in gas-works, where it is
of the utmost importance that the valves should be made, and remain practically
perfectly gas tight.
The invention consists of a cast iron chamber having an inlet and outlet formed
at its lower part, and provided with two slide valves, each kept closely in contact
with a faced seat, by a spring, that bears against the back of the slide and a feather
on each side of the chamber. The slides are placed facing each other, but somė
distance apart, and are connected together by a bar that fits into an inclined recess
in the lower part of each slide. This bar has fastened to its centre a rack, the
back of which may be supported by a friction roller. The toothed face of the
rack is engaged by a pinion fixed on a spindle that works in a bearing on one side
of the interior of the chamber, extends across, and passing through a stuffing box
projects beyond the exterior surface of the opposite side of the chamber. The
outer end of the spindle is made square, so as to admit of a winch or other suitable
handle being applied to turn it, and is provided with a removable catch which rests
against a stud, or any other suitable arrangement may be employed, to prevent the
slides of the valve, when the latter is placed vertically, from closing by their own
weight. To the lower, or any convenient part of the chamber between the two
slides there is fixed on the outside a wrought iron tube which rises above the top
of the valve, and at its upper extremity has fixed to it a well made stop cock, or,-
that part of the top of the chamber which covers the space between the two slides
may have a stop cock fitted to it. If found desirable especially in the case of very
large valves, the rising tube before mentioned may have attached to it two branches
each having a stop cock, the one branch being connected to the inlet end of the
valve, and the other to the outlet. The apparatus is provided with a suitable
indicator to show whether the valve is open or shut.
The action of the valve is as follows. Supposing the two slides to be open and
all the stop-cocks closed, the gas or other Huid will flow from the inlet to the
outlet without bindrance, but when it is desired to intercept the flow, the winch,
or other handle, is applied and turned until the two slides close their respective

page_text: openings. The stop cock at the end of the rising tube is then opened, whereupon
the space between the two slides is put in communication with the atmosphere.
The face of each slide is thus relieved from pressure while it is subjected to the
whole of the pressure of the gas or other fluid at its back, thus keeping it close to
its seat, and securing its tightness-a condition that cannot be ensured by any
single-slide arrangement. When it is necessary to open the valve, the stop cock
on the rising tube is closed and the handle turned in the contrary direction. The
slide will then be drawn up, or on one side, as the case may be, and the gas or other
fluid will be at liberty to flow from the inlet to the oultet without interruption.
If in practice it should, at any time, be found necessary to equalize the pressure on
both sides of the slides to allow of the valve being opened more easily, the stop
cock on either of the branch tubes may be opened when the desired effect will
result.
Instead of a rack and pinion movement for opening and closing the valve, a screw
arrangement may be employed if considered more advantageous.
Valves made as before described are especially applicable in connection with
purifiers on account of the very great security they afford against the passage of
impure gas Especially is this the case in purification from the so called "sulphur
compounds," where, as is well known, the presence of even one thousandth of a
per cent of Carbonic acid is of importance. For not only is any leak of either slide
immediately indicated by the escape of gas from the open pipe (which thus acts as
a warning that the valve requires to be over-hauled) but even should one of the
springs break (a frequent cause of trouble in ordinary valves) the pressure of the
gas alone against the backs of the slides is sufficient to keep the valve tight. The
sole use of the spring is to keep the slides bearing against their respective faces
during the time of closing, by which means any deposit of tar, or other accumulation
is scraped away by the slides themselves, and a clean face is secured. By the
construction and arrangement of the parts it is impossible for any gas or other fluid
to pass from the inlet to the outlet when the valve is closed, as any that may leak
by either slide escapes into the atmosphere instead of contaminating the purified
gas, whereas in all single slide valves used as bye-passes (or as inlets or outlets
where there is more than one inlet and one outlet on a purifier) it is well known
that leakage may go on during the whole time the purifier is at work without any
warning being given to the men in charge, except by the chemical tests. being
unsatisfactory.
BOLL 1
J
1001

page_text: We, FRANK MORRIS and CHARLES WATSON FOLKARD, both of the Gas Works,
Brentford, in the County of Middlesex, Civil Engineers, do hereby declare the
nature of our invention for "IMPROVEMENTS IN VALVES" and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement, reference being had to the accompanying drawings and to
the letters and figures marked thereon, that is to say :-
This invention relates to valves adapted for intercepting the flow of either gas,
water, or other fluids, but are especially applicable for use in gas works, where it is
of the utmost importance that the valves should be made, and remain practically
perfectly gas-tight.
In order that the invention may be more easily understood drawings are attached
hereto, Fig 1 being a vertical sectional elevation of the case; the rack, pinion,
roller and cross-bar being in elevation; Fig 2 a section through A, B, Fig 1, and
Fig 3 a side elevation. In the description following similar letters refer to the
same parts, in each of the views.
The invention consists of a cast iron chamber C, having an inlet D and an
outlet E formed at its lower part, and provided with two slide valves F, F each
kept closely in contact with a faced seat G, by a spring H that bears against the
back of the slide and the end of the case of the valve. The slides are placed facing
each other but some distance apart, and are connected together by a bar J that fits.
into a curved and inclined or otherwise shaped recess in the lower part of cach
slide. This bar has fastened to its centre a rack K, the back of which may be
supported by a friction roller L. The toothed face of the rack is engaged by a
pinion M fixed on a spindle N that works in a bearing O on one side of the interior
of the chamber, extends across, and passing through a stuffing box P projects beyond
the exterior surface of the opposite side of the chamber. The outer end of the
spindle is made square so as to admit of a winch or other suitable handle being
applied to turn it, and is provided with a removable catch Qwhich rests against a
pin or stud R, or any other suitable arrangement may be employed to prevent the
slides of the valve, when the latter is placed vertically, from closing by their own
weight. To the lower, or any convenient part of the chamber between the two
slides there is fixed on the outside a wrought iron tube S which rises above the top
of the valve, and at its upper extremity has fixed to it a well made stop-cock T, or,
that part of the top of the chamber which covers the space between the two slides
may have a stop-cock fitted to it. If found desirable especially in the case of very
large valves, the rising tube before mentioned may have attached to it two branches
each having a stop-cock, the one branch being connected to the inlet end of the
valve, and the other to the outlet. The apparatus is provided with a suitable
indicator to show whether the valve is open or shut.
The action of the valve is as follows. Supposing the two slides to be open and
all the stop cocks closed, the gas or other fluid will flow from the inlet to the outlet
without hindrance, but when it is desired to intercept the flow, the winch or other
handle is applied and turned [the catch having been first released by slacking
the set screw I) until the two slides close their respective openings. The stop-
cock T at the end of the rising tube is then opened, whereupon the space between
the two slides is put in communication with the atmosphere. The face of each slide
is thus relieved from pressure while it is subjected to the whole of the pressure of
the gas, or other fluid, at its back, thus keeping it close to its seat, and securing its
tightness, a condition that cannot be ensured by any single-slide arrangement,

page_text: When it is necessary to open the valve, the stop-cock T on the rising tube is closed
and the handle turned in the contrary direction. The slides will then be drawn up,
or on one side, as the case may be, and the gas or other fluid will be at liberty to
flow from the inlet to the outlet without interruption. If in practice it should at
any time be found necessary to equalize the pressure on both sides of the slides to
allow of the valve being opened more easily, the stop cock U on either side of the
branch tubes may be opened when the desired effect will result.
· Instead of a rack and pinion movement for opening and closing the valve, a screw
arrangement may be employed if considered more advantageous.
Valves made as before described are especially applicable in connection with
purifiers on account of the very great security they afford against the passage of
impure gas. Especially is this the case in purification from the so called "sulphur
compounds," where as is well known the presence of even one thousandth of a per
cent of carbonic acid is of importance. For not only is any leak of either slide
immediately indicated by the escape of gas from the open pipe [which thus acts as
a warning that the valve requires to be overhauled] but even should one of the
springs break [a frequent cause of trouble in ordinary valves] the pressure of the
gas alone against the backs of the slides is sufficient to keep the valve tight. The
sole use of the springs is to keep the slides bearing against their respective faces
during the time of closing, by which means any deposit of tar, or other accumulation
is scraped away by the slides themselves, and a clean face is secured. By the
construction and arrangement of the parts it is impossible for any gas or other
fluid to pass from the inlet to the outlet when the valve is closed, as any that may
leak by either slide escapes into the atmosphere instead of contaminating the
purified gas, whereas in all single slide valves used as bye-passes [or as inlets or
outlets where there is more than one inlet and one outlet on a purifier] it is well
known that leakage may go on during the whole time the purifier is at work
without any warning being given to the men in charge, except by the chemical
tests being unsatisfactory.
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,-
The construction of valves with two slides having faces arranged as shown, and
an intervening space, and fitted with tubes and stop cocks for the purpose
herein before set forth, and as herein described and shown on the drawings.
;
Dated this 28th day of November 1884.