Improvements in Steam and like Reducing Valves.
Year: 1898

page_text: Date of Application, 14th Feb., 1898
Complete Specification Left, 14.h Nov., 1898-Accepted, 7th Jan., 1899
PROVISIONAL SPECIFICATION.
Improvements in Steam and like Reducing Valves.
I, JOHN EDWARD LEWIS OGDEN, of Penshurst, Vernon Road, Leytonstone,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the construction and arrangement
of steam and like reducing valves the improvements being particularly applicable
to valves constructed in accordance with the Specification of my invention
No. 1747/93, inasmuch as I am enabled to produce a balancing piston reducing
valve of the type therein described but with modifications in the construction of its
details such as will permit of a more sensitive and more positive action being
obtained in the operation of the valve.
In carrying my invention into effect when constructing a reducing valve for
steam pressure I make the body of the valve with flanges having openings on
the one side for the high pressure and on the other side to the outlet of reduced
pressure while within the casing or central portion of the valve I arrange my
balancing piston valve having within it a pilot or starting valve constructed sub-
stantially in the manner described in my previous Specification herein before
referred to.
Instead of employing a controlled spring pressure for determining the reduced
pressure I employ instead a balanced steami piston which works in a chamber
formed in the upper part of my valve casing and I allow the steam to pass through
the hollow pilot valve spindle and to act upon the upper side of the piston which
piston is rigidly connected to the projecting end of the pilot valve spindle which
passes through the centre of the balanced main valve within the casing.
I construct my pilot valve with a hole bored through the entire length of the
spindle, and a loose sliding plug exactly of the same diameter as the pilot valve
This
is fitted into a nut which secures the spindle to the balancing piston.
arrangement converts the pilot valve into an equilibrium valve either when it
is open or shut at any pressure. The leakage of the high pressure steam passing
the balancing plug on to the top side of the balancing piston maintains a fixed
determined governing pressure notwithstanding that there is a reduced or varying
pressure on the under side of the balancing piston.
The main valve I arrange with a balancing piston fitting in a cylindrical
chamber formed in the central portion of the valve body, while the valve face
itself seats upon or against the underside of the seating formed upon the bottom
portion of the chamber which acts as the cylinder for the piston to work in. The
ports or openings between the piston portion of the valve and the valve face
itself allow the high pressure steam after it has been reduced to escape through

page_text: the opening between the valve face and the balancing piston and thus to pass to
the outlet side of the valve.
The high pressure steam acts to force the main valve against its seat when it
is closed only; when this valve is open the high pressure steam then acts equally
upon both its ends, and at the same time it passes up through the hollow pilot valve.
The steam which is passed up the hollow or core of the pilot valve spindle finds
its outlet by leakage around the loose balancing plug fitting within the nut or
collar which attaches the spindle to the main balancing piston, and the steam thus
escaping past and loose fitting plug acts upon the
piston and tends to force the pilot valve, and n the upper side of the balancing
off their seats; but the
pressure which is required for this purpose is determined by means of a spring
or other loaded blow-off valve arranged in the upper cap or other convenient
position of the piston chamber. The load upon the relief valve can be graduated
or adjusted to suit the pressure at which it is desired to reduce the steam from
the main or high pressure supply to the reduced or outlet side of the valve.
To prevent an undue chattering or a too sensitive movement of the pilot valve
upon its seat I arrange a spring on the underside of the pilot valve stem which
tends to keep the pilot valve closed, the spring being adjustable by means of
external screws and lock-nuts to suit any requirement. I make my pilot valve
with a projecting shoulder or collar which pushes open the main valve when the
pilot valve has been slightly opened and the main valve thereby placed in equi-
librium. the operation of the valve together with the main valve being similar to
the operation of the piston and pilot valve described in my Specification
No. 1747/93, hereinbefore referred to.
I sometimes employ a dash pot or cataract in connection with my pilot valve
spindle to prevent a too sudden motion of the valve from and towards its seat.
Instead of employing a moving piston within a piston chamber
may arrange
a diaphragm against which the steam can work and employ the same arrangement
of a spring loaded relief valve and sliding plug as hereinbefore described when
employing the piston in connection with my pilot valve spindle.
I do not limit the application of my invention to any particular form of valve
casing or chamber but I modify the arrangement of the valve face
and the ports and passages therein, varying also the form and arrangement
of springs to suit the type of valve which is to be constructed and the purposes
for which such valve is to be employed.
I arrange an opening- or series of openings to permit the steam from the outlet
side or the reduced pressure end of the valve to act upon the underside of the
pilot valve piston or the diaphragm so that the piston or diaphragın is subjected
to the live pressure on the one side determined by the adjustable relief valve and
to the reduced pressure on the underside.
Noted this 14th dow of F 1908
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents:

page_text: the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
This invention relates to improvements in the construction and arrangement
of steam and like reducing valves the improvements being particularly applicable
to valves constructed in accordance with the Specification of my invention
No. 1747/93, inasmuch as I am enabled to produce a balancing piston reducing
valve of the type therein described but with modifications in the construction of its
details such as will permit of a more sensitive and more positive action being
obtained in the operation of the valve.
In the two accompanying sheets of explanatory drawings Figure 1 is a sectional
elevation of one form of my improved reducing valve, and
Figure 2 is a similar view of a modified form of construction which I some-
times employ, and
Figure 3 is a detailed sectional view of one form of a direct steam supply
arrangement I sometimes adopt.
In carrying my invention into effect when constructing a reducing valve for
steam pressure of the type, as illustrated in Figure 1 I make the body A of the
valve with flanges having openings on the one side A¹ for the high pressure and
on the other side A to the outlet of reduced pressure while within the casing or
central portion of the valve 1 arrange my balancing piston valve B having
within it a pilot or starting valve C constructed substantially in the manner
described in my previous Specification hereinbefore referred to.
Instead of employing a controlled spring pressure for determining the reduced
pressure I employ a balanced steam piston D which works in a chamber formed
in the upper part of my valve casing and I allow the steam to pass through the
hollow pilot valve spindle and to act upon the upper side of the piston 1) which
piston is rigidly connected to the projecting end of the pilot valve spindle which
passes through the centre of the balanced main valve B within the casing.
I construct my pilot valve C with a hole bored or formed through the entire
length of its spindle, and a loose sliding plug E exactly of the same diameter as
the pilot valve C is fitted into a nut F which secures the spindle c¹ to the balancing
piston D. This arrangement converts the pilot valve into an equilibrium valve
either when it is open or shut at any pressure. The leakage of the high pressure
steam passing the balancing plug E on to the top side of the balancing piston. I
maintains a fixed determined governing pressure notwithstanding that there is
a reduced or varying pressure on the underside of the balancing piston 1).
The main valve B I arrange with a balancing piston G fitting in a cylindrical
chamber formed in the central portion of the valve body A while the valve face
itself seats upon or against the underside of the seating formed upon the bottom
portion of the chamber which acts as the cylinder for the piston G to work in.
The ports or openings g between the piston portion of the valve and the valve face
itself allow the high pressure steam after it has been reduced to escape through
the opening between the valve face and the balancing piston and thus to pass
to the outlet side A2 of the valve.
The high pressure steam acts to force the main valve B against its seat when it
is closed only: when this valve is open the high pressure steam then acts equally
upon both its ends and at the same time it passes up through the hollow pilot
valve c¹. The steam which is passed up the hollow or core e' of the pilot valve
spindle finds its outlet by leakage around the loose balancing plug E fitting
within the nut or collar F which attaches the spindle to the main balancing piston,
and the steam thus escaping past the loose fitting plug acts upon the upper side
of the balancing piston D and tends to force the pilot valve C and main valve B
off their seats: but the pressure which is required for this purpose is determined
by means of a spring or other loaded blow off valve H arranged in the upper cap
or other convenient position of the piston chamber. The load upon the relief
valve H can be graduated or adjusted to suit the pressure at which it is desired
to reduce the steam from the main or high pressure supply A' to the reduced or

page_text: outlet side of the valve A2. To prevent an undue chattering or a too sensitive
movement of the pilot valve upon its seat I sometimes arrange a spring K on the
underside of the pilot valve stem which tends to keep the pilot valve closed, the
spring being adjustable by means of external screws L and lock nuts to suit any
requirement. I make my pilot valve C with a projecting shoulder or collar
which pushes open the main valve B when the pilot valve has been slightly
opened and the main valve thereby placed in equilibrium the operation of the
valve together with the main valve being similar to the operation of the piston
and pilot valve described in my Specification No. 1747/93, herein before referred to.
I sometimes employ a dash pot or cataract as shown at N Figure 2 in con-
nection with my pilot valve spindle to prevent a too sudden motion of the valve
from and towards its seat.
Instead of employing a moving piston within a piston chamber I may arrange
a diaphragm against which the steam can work and employ the same arrangement
of a spring loaded relief valve and sliding plug as hereinbefore described when
employing the piston in connection with my pilot valve spindle.
When constructing the simpler form of positive steam loaded reducing valve
as shown in Figure 3 I convey the high pressure steam from the inlet side A¹
to the upper side of the piston D by means of a tube M or through a passage or
port which may be formed in the body of the valve for this purpose. I adjust
the area of the opening communicating with the upper side of the piston through
the pipe M by means of a set screw or plug O. The piston D may be provided
with plain grooves d or with spring rings as desired. Upon the lower end of
the pilot valve spindle I secure a dash piston N instead of a spring as Kin
Figure 1. The connecting boss of the spindle I provide with passages n¹ for
allowing the high pressure steam to pass through the spindle c¹ to the upper side
of the piston D.
When the possibility of corrosion is great I may place the spring outside
instead of inside the valve casing modifying the connections and position to suit
the altered position.
I do not limit the application of my invention to any particular form of valve
casing or chamber but I modify the arrangement of the valve face and the ports
and passages therein, varying also the form and arrangement of springs to suit
the type of valve which is to be constructed and the purposes for which such valve
is to be employed. I arrange an opening or series of openings to permit the
steam from the outlet side or the reduced pressure end of the valve to act upon
the underside of the pilot valve piston or the diaphragm so that the piston or
diaphragm is subjected to the live pressure on the one side determined by the
adjustable relief valve and to the reduced pressure on the underside.
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 improvements in reducing valves having a positive steam controlling
pressure acting upon the balancing or actuating piston of the valve substantially
as hereinbefore described and as illustrated in the accompanying drawings.
2. In a reducing valve the combination of a pilot valve having a hollow
spindle, with a loose sliding plug working in a collar or nut attached to the
actuating or balancing piston substantially as and for the purposes hereinbefore
described and as illustrated in the accompanying drawings.
3. In a reducing valve the arrangement of a dash pot and piston or an adjust-
able spring in connection with a pilot valve and piston for preventing a too sudden
or vibratory movement of the valve substantially as hereinbefore described and
as illustrated in the accompanying drawings.
4. In a reducing valve the combination of a positively or spring loaded relief
valve for regulating the pressure which acts upon the upper side of the actuating
piston with a piston and pilot valve controlling the movement of the main valve,

page_text: substantially as herein before described and as illustrated in the accompanying
drawings.
5. In a reducing valve the arrangement in combination of an independent
supply passage or pipe for conveying the high pressure steam to tlie upper side
of the actuating piston substantially as hereinbefore described and as illustrated
in Figure 3 of the accompanying drawings.
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.