Improvements in Valves for Steam, applicable also for Water, Gas, and similar purposes.
Year: 1895

page_text: Date of Application, coro Jan., 1992
Complete Specification Left. 23rd Oct., 1895-Accepted, 23rd Nov.. 18'5
· PROVISIONAL SPECIFICATION.
Improvements in Valves for Steam, applicable also for Water, Gas,
and similar purposes.
I CHARLES HENZELL HOLGATE of Cardigan Villa, Headingley, Leeds in the
County of York Mechanical Engineer do hereby declare the nature of this inven-
tion to be as follows.
The object of my invention is to overcome the difficulty at present experienced
with steam stop valves of keeping such valves tight, due chiefly to the deforming
effect of high temperatures, leading to irregular expansion with valves and valve
cases of irregular shape and varying thickness. My invention refers more
especially to that type of valve in which two opposite valve seats are provided,
each covered by a separate valve or lid, which latter are forced apart i.e., against
the respective seats by means of a screw and wedge, or knuckle joint,-spring,-
link or other device when the valves or lids have been moved opposite the faces;
the screw or other arrangement serving also to raise or move the valves or lids so
as to more or less fully uncover the valve seats to permit of the free passage of
steam through the valve.
-
My invention consists essentially in forming the valves or lids practically
symmetrical about the axis or centre line through the valve, and of a curved form
in cross section. The valve is thus cup shaped, or forms part of a sphere, or of a
paraboloid about its apex, or of other surface of revolution having a single or
multiple curve as the generating line.
The bearing faces of the valve and the valve seat are usually and preferably at
right angles to the centre line through the valve, but even if inade somewhat
inclined thereto, owing to the symmetry of the valve, the plane of the line of
contact of the valve and seat always retains such position with respect to the
centre line, even under expansion, and consequently is always true with the
valve seat.
The abutting faces for the before-mentioned wedge-or knuckle joint or other
device have hitherto been formed on or as a part of the valve. In my invention
such abutments are formed separate, and fit in a suitable circular recess cast on the
corresponding side of the valve. In order not to interfere with the symmetrical
expansion of the valve, this recess is formed circular or cylindrical about the centre
line of the valve, so that the valve is still truly symmetrical about its centre line
or axis.
The wedge or equivalent device is provided with rectangular side wings, fitting
in corresponding recesses cast in the side of the valve casing, to prevent rotation of
the nut formed in the upper part of the wedge piece or other device during rotation
of the screw.
Similar side wings, but provided with curved outer edges may be provided, so as
to serve as supports for receiving the valves, when the screw is slackened back.
It will be evident that the above construction of valve is applicable to other than
steam purposes, for example to water and gas purposes, especially where the
pressure or range of temperature is great.
Dated this 22nd day of January 1895.
20
J. CLARK JEFFERSON,
2 East Parade, Leeds, Agent for Applicant.

page_text: Improvements in Valves for Steam, applicable also for Water, Gas,
and similar purposes.
I CHARLES HENZELL HOLGATE, of Cardigan Villa, Shaw Lane, Headingley
Leeds in the County of York, 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 :-
The object of my invention is to overcome the difficulty at present experience:
with steam stop valves of keeping such valves tight, due chiefly to the deforming
effect of bigh temperatures, which lead to irregular expansion with valves and
valve cases of irregular shape and varying thickness. My invention refers more
especially to that type of valve in which two opposite valve seats are provided,
each covered by a separate valve or lid. These latter are forced apart i.e. against
their respective seats (by means of a screw and wedge; or knuckle joint; spring;
link; or other device) when the valves or lids have been moved opposite the faces.
The screw or other arrangement serves also to raise or move the valves or lids, so
as to more or less fully uncover the valve seats to permit of the free passage of
steam, etc. through the valve.
My invention consists as follows. The valves or lids are formed practically
symmetrical about the axis or centre line through the valve, and of a curved form
in cross section. The valve is thus cup shape or forms part of a sphere or of a
paraboloid about its apex, or of other symmetrical surface of revolution having
a single or multiple curve as the generating line.
The bearing surfaces of the valve and the valve seat are usually and preferably
at right angles to the centre line through the valve, but even if made somewhat
inclined thereto, owing to the symmetry of the valve, the plane of the line of
contact of the valve and seat always retains its original or normal position with
respect to the centre line even under expansion and consequently is always true
with the valve seat.
Also the abutting fares for the before mentioned wedge or knuckle joint or other
device which have hitherto been formed on or as part of the valve, are in my
invention formed separate and fit in a suitable circular recess cast on the corre-
sponding side of the valve. In order not to interfere with the symmetrical
expansion of the valve this recess is formed circular or cylindrical about the centre
line of the valve, so that the valve is still truly symmetrical about its centre line
or axis.
The wedge or equivalent device is provided with rectangular side wings fitting in
corresponding recesses cast in the side of the valve casing, to prevent rotation of
the nut formed in the upper part of the wedge piece or other device, during
rotation of the screw.
Similar side wings, but provided with curved outer edges may be provided, so as
to serve as supports for receiving the valves, when the screw is slackened back.
It will be evident that the above construction of valve is applicable to other than
steam purposes, for example to water and gas purposes, especially where the
pressure or range of temperature is great.
In the case of high pressure valves, for water purposes, the valve may be
formed with a straight face, and with a cylindrical recess at the back.
In the case of high temperatures leading to great expansion, I propose also to
form the valve seat piece symmetrical and separate from the valve box casting
to which it is fitted, so as to ensure also the symmetrical expansion of the valve
seat, as if formed on the valve box casting, which is irregular in shape, the truth
and therefore the tightness of the valve may be interfered with.

page_text: And in order that my invention and the manner in which the same is to be
performed may be more readily and clearly understood, I have annexed hereto the
accompanying drawings in which:
•
Fig. 1 is a vertical longitudinal section.
Fig. 2 is a vertical transverse section.
Fig. 3 is a horizontal section on A B Fig. 1, and Fig. 4 is a horizontal section
on CD Fig. 1, of a stop valve constructed according to my invention..
a indicates the valve box casting, b, b, are the valves, spherical in shape and
formed with a circular or cylindrical recess c in the centre of the valve.
d, d, are the valves seats, e, e, are the separate abutment pieces fitting in the
recesses c, c, having inclined faces against which the inclined faces of the wedge
piece fabut.
The wedge piece shewn also in elevation in Fig. 5, consists of a hollow tube or
cylinder closed at the lower end, provided at its upper end with a nut thread, in
which works the lifting screw g. The wedge piece is further provided with side
wings h, h, having curved outer edges so as to serve as supports for steadying and
receiving the valves b, b, when the screw g is slackened back.
Two additional side wings or guides i, i, fitting at their outer edges in grooves or
guides attached to or cast on the corresponding sides of the valve box casting are
provided to prevent the rotation of the wedge piece whilst the screw is being
rotated.
j,j, are circular projecting faces for the purpose of steadying the valves as they
are being lifted and lowered.
In the case where link mechanism such as a knuckle joint device is employed for
forcing the valves apart, that is against their respective valve seats, the links may
be conveniently attached by pin joints to the abutment pieces e, e, and these fitting
in the recesses c, c, as also the said recesses may be formed hemispherical.
In the case of great pressures and for water purposes the valve may be made
with a straight face, and the circular recess formed on the back of the valve as
shewn in Fig. 6.
It will be evident from the above described construction of my improved valves,
that they can be rotated round the axis of the valve into any position.
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. In valves for steam, water, gas and the like purposes, the use of valves, the
shape of which is part of a sphere or other symmetrical portion of a surface of
revolution, and which are provided with a circular or cylindrical recess concentric
with the valve substantially as and for the purpose or purposes herein set forth.
2. In valves for steam, water, gas and the like purposes, the combination
consisting of the valves, b, b, separate abutment pieces e, e, and the wedge piece f,
or other equivalent mechanisin, all substantially as described and illustrated.
3. My improved valve substantially of the construction or constructions herein
set forth and illustrated.
Dated this 22nd day of October 1895.
J. CLARK JEFFERSON,
2 East Parade, Leeds, Agent for Applicant.