Year: 1897

page_text: I, HERBERT ARTHUR PERTWEE, of Penbryn, Burry Port, in the county of
Carmarthen, Associate Member of the Institution of Mechanical Engineers, do
hereby declare the nature of this invention to be as follows:-
-
My invention consists in the combination with a stop valve of a steam separator,
that is to say, a device for drying steam by separating therefrom particles of water
held in suspension, and of a trap for periodically discharging the water from the
said separator.
In carrying out my invention I construct the valve casing with the usual
partition having in it the seat for the valve proper the space or chamber below the
said partition being made much larger than heretofore in order to receive the
separator and to afford space for the accumulation of the water which is to be dis-
charged from time to time. The steam is arranged to enter the said chamber or
space before passing the valve proper and in order to dry the steam I provide
means for imparting a gyratory or rotary motion to the same in order that centri-
fugal action shall be set up which will cause the particles of water to fly towards the
sides of the vessel from which they drain down to the bottom.
In practice I find it advantageous to employ a separator of the kind in which
a hollow cylinder fitting into the opening beneath the valve extends some distance
down into the chamber and has on its outer side a helical blade which causes the
steam to pass in a circular path from the inlet opening of the valve to the lower
end of the tube of the separator., I sometimes also arrange a helical blade within
the cylinder in such a manner as to counteract the rotary motion of the steam as
it flows towards the valve proper.
The steam trap which I advantageously use consists of a discharge nozzle pro-
jecting up into the vessel and having fitted on to it a cap which normally covers
the discharge openings in the said nozzle, the cap itself has fixed to it a float
which, when a certain quantity of water has collected in the bottom of the casing,
rises to lift the cap to more or less uncover the discharge openings in the nozzle
and thereby allow the escape of the water under the steam pressure the cap again
dropping to close the openings when the water reaches a certain level.
Dated the 29th day of January 1896.

page_text: I, HERBERT ARTHUR PERTWEE, of Penbryn, Burry Port, in the county of
Carmarthen, Associate Member of the Institution of Mechanical Engineers, 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:
-
My invention consists in the combination with a stop valve of a steam separator,
that is to say, a device for drying steam by separating therefrom particles of water
held in suspension, and of a trap for periodically discharging the water from the
said separator.
In carrying out my invention I construct the valve casing with the usual par-
tition having in it the seat for the valve proper the space or chamber below the
said partition being made much larger than heretofore in order to receive the
separator and to afford space for the accumulation of the water which is to be dis-
charged from time to time. The steam is arranged to enter the said chamber or
space before passing the valve proper and in order to dry the steam I provide
means for imparting a gyratory or rotary motion to the same in order that centri-
fugal action shall be set up which will cause the particles of water to fly towards
the sides of the vessel from which they drain down to the bottom.
In practice I find it advantageous to employ a separator of the kind in which a
hollow cylinder fitting into the opening beneath the valve extends some distance
down into the chamber and has on its outer side a helical blade which causes the
steam to pass in a circular path from the inlet opening of the valve to the lower
end of the tube of the separator. I sometimes also arrange a helical blade within
the cylinder in such a manner as to counteract the rotary motion of the steam as
it flows towards the valve proper.
My invention will be clearly understood by reference to the accompanying
drawing, which is a sectional elevation of a combined stop valve and steam.
separator arranged in accordance with my invention.
In this figure a is the casing of the valve, b is the steam inlet, c is the steam
outlet, d is the partition, between the said inlet and outlet, having a circular
aperture formed in it, and e is the valve proper having a seat in the said aperture
the said valve being operated by the stem f in the usual manner.
g is the hollow cylinder of the steam separator which is fitted into the aperture
below the valve e and h, h are helical blades on the outside of this cylinder which
are of a diameter, substantially corresponding with the internal diameter of the
casing, and which serve to impart a gyratory motion to the steam; i is the helical
blade which is arranged inside the cylinder g and which serves to counteract the
rotary motion of the steam as it flows up through the cylinder g.
I advantageously arrange a steam trap in conjunction with my combined stop
valve and separator. As shewn this valve consists of a discharge nozzle j pro-
jecting up into the casing and having fitted on to it a cap k which normally covers
the openings, in the said nozzle. This cap has fixed to it a float m which,
when a certain quantity of water has collected in the bottom, rises to lift the cap k
and thereby more or less uncovers the discharge openings 1, 1 in the nozzle to allow
the escape of the water under the steam pressure. When the water reaches a
certain level the cap again drops on to the nozzle to close the discharge openings.
It is to be understood, however, that any desirable form of steam trap may be used.
n is a curved guide plate which is bolted in the joint at the lower part of the
casing a. Slots n' are cut out of this plate level with the inside of the casing to

page_text: allow the water which runs down the same to enter the trap and the said plate is
made conical at the centre to guide the steam in ascending the hollow cylinder g.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The construction, and application to a steam separator, of a stop valve
substantially as hereinbefore described.
2. The combination with a stop valve of a steam separator and a steam trap,
substantially as described.
Dated the 28th day of October 1897.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.