Improvements in Valves.
Year: 1894

page_text: Date of Application, 26th June, 1894
Complete Specification Left. 26th Mar.. 1895-Accepted. 22nd June. 1895
PROVISIONAL SPECIFICATION.
Improvements in Valves.
We THOMAS THORP of Whitefield near Bary in the County of Lancaster
Engineer, and THOMAS GARDINER MARSH of 6 Rosamond Street East,
Manchester, in the County of Lancaster, Mechanical Engineer, do hereby declare
the nature of this invention to be as follows:-
This invention relates to valves for stopping or shatting off the flow of water,
steam, gas or other fluids and consists in an improved construction of the valve or
its face by means of which a tight closure of the valve is obtained without its
having to be screwed or pressed down very tightly upon the seat as required with
the ordinarily used valves.
In order to attain this object we form the valve of a metal part or disc'somewhat
larger in diameter than the seating for the valve and stretch over the same a
diaphragm of leather, indiarubber or similar material suitable to the nature of the
Huid for which the valve is intended. The face of the metal disc may be flat or
concave, and the diaphragm fixed to the same by turning the edges of the leather
or other substance over, and binding them round the outside of the valve, or
pressing on a hoop, or fixing the same by means of a screwed ferrule or in any
other way ordinarily used for such purpose. The diaphragm is formed with a hole
in the centre, through which a spindle connected to the valve disc may pass for
guiding the valve in the seating, but leaving clearance space in the hole so that the
Huid can pass behind the diaphragm. The valve dise may be raised off or lowered
upon the seating by screw, cam, lever or in any known way used for this purpose;
and the valve spindle passing out of the valve case may be packed in any ordinary
way or connected to a diaphragın.
When the valve thus constructed is held tightly down upon its seating, the fluid
pressure passing between the diaphragm and valve dise will force the diaphragm
upon the seat with a force corresponding to the pressure under the valve and thus
make the vulve close tightly without its being pressed hard upon the seat by the
external operating parts, so that a very light pressure exerted upon them
nevertheless produces a tight closure of the ontlet.
Dated the 25th da. S Luno 1001
R. J. URQUHART,
57, Barton Arcade, Manchester, and 5, Clayton Square, Liverpool,
Consulting Engineer and Patent Agent.
We THOMAS THORP of Whitefield near Bury in the County of Lancaster,
Engineer and THOMAS GARDINER MARSH of 6 Rosamond Street East,
Manchester in the County of Lancaster, Mechanical 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 relates to valves for stopping or shutting off the flow of water,

page_text: steam, gas or other fluids, and consists in an improved construction of the valve or
its face by means of which a tight closure of the valve is obtained without its
having to be screwed or pressed down very tightly upon the seat as required with
the ordinarily used valves.
In order to attain this object we form the valve of a metal disc or equivalent
part somewhat larger in diameter or area than the seating for the valve and
stretch over the same a diaphragm of leather, indiarubber or similar material
suitable to the nature of the fluid for which the valve is intended. The face of
dise or equivalent part may be flat or concave, and the diaphragm fixed tight to
the same by turning over the edges of the leather or other substance and binding
them round the outside of the valve disc, or by pressing on a hoop, or by fixing
the edges by means of a screwed ferrule, or in any other way ordinarily used for
such purpose. The diaphragm is formed with a hole or opening, through which
the spindle connected to the valve dise may pass, but leaving clearance space in
the hole so that the fluid can pass behind the diaphragm.
The valve disc may be raised off or lowered upon the seating by screw, cam,
lever or in any known way used for this purpose, and the valve spindle passing out
of the valve casing may be packed in any ordinary way or connected to a
diaphragm.
On the drawing appended hereunto :—
Fig. 1 shows a vertical section and Fig. 2 a plan of a valve casing and improved
valve for a prepayment gas meter.
Fig. 3 a view of a stop cock with improved valve partly in section.
Our improved arrangement of valve is more particularly intended and suitable
for the gas valves of prepayment inetere, because the ordinary disc or similar
valves cannot be made to close tightly, as when the mechanism controlling the
same has nearly closed the valve, the pressure in the drum or bellows of the meter
becomes reduced till it no longer suffices to move them and the prepayment and
valve controlling mechanism, so that a continuous leakage of gas through the valve
and meter occurs. This defect is remedied by our improvements. On Figs. 1
and 2 is the valve casing with inlet opening and outlets e communicating
respectively with the gas inlet and the port c' leading to the drum or bellows.
The valve d is screwed upon the spindle e and formed with a recess d' upon its
face and over its face a leather diaphragm is stretched and fastened on by a hoop,
driven tight on to the turned over edge of the diaphragm. A diaphragm his
nipped at the centre between n shoulder of the valve spindle e and the valve d and
at its edges between a ring i and the cap k screwed upon the casing a and serves
instead of a stuffing box.
The spindle e may be prolonged and guided in the valve casing as shewn, the
opening in the diaphragm being larger than the spindle so as to leave a
clearance.
A spring holds the valve open until the meter mechanism closes it by lifting
the spindle e. As soon as the diaphragm touches the seating a', the gns under
pressure enters the recess d' through the clearance round the spindle and forces the
diaphragm upon the seating, because the area of the diaphragm is larger than the
internal aren of the seating, the pressure in the ensing a becoming reduced as soon
as the flow of gas is interrupted. The gas inlet is thus closed tightly without any
great pressure being put upon the valve spindle e for this purpose.
Fig. 3 shows a stop cock provided with the improved valve m which is constructed
substantially as the valve herein before described with reference to Figs. 1 and 2
and takes the place of the usunl disc with leather washer fixed thereto.
As soon
as the valve is screwed lightly upon the seating, the water or other Blaid under
pressure enters the cavity of the valve disc through the opening a in the diaphragm
and forces the latter upon the seating.
It is not necessary that the valve face should be recessed, as the fluid under
pressure will pass behind the diaphragm also if it is stretched over a flat surface but
the recessing of the diaphragm facilitates such passage. Valves with diaphragms

page_text: on their faces may be used in other cases and we do not confine ourselves to the
construction or applications shown on the drawings which are only shown as
examples.
For instance the valves may be hinged flap valves of circular, rectangular or
other form and pressed upon their seats in any usual manner.
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 :
In stop or shut off valves for fluids the use and arrangement of a disc-valve or
its equivalent over the face of which is stretched a flexible diaphragm of larger
area than the internal area of the valve seating and formed with an opening for
the fluid to pass between the diaphragm and valve disc or its equivalent
substantially as herein before described and illustrated by the drawings.
Dated the 25th day of March 1895.
R. J. URQUHART.