Improvements in Pressure Reducing Valves.
Year: 1893

page_text: Date of Application, 13th Jan., 1893
Complete Specification Left, 13th Oct., 1893--Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Pressure Reducing Valves.
I WILLIAM THOMAS ELLISON Junior, of 34 Zachariah Street, Eccles New
Road, Salford, in the County of Lancaster, Engineer, do hereby declare the nature
of this invention to be as follows:-
This invention relates to the construction of what are known as reducing valves
for regulating the pressure of steam or other fluid my object being to obtain
variable pressures, and so regulate the same that should the initial pressure from
the generator be decreased the reduced pressure will still be a constant proportion
thereof.
My invention relates to that class of valve in which the reduced pressure is
obtained by causing a piston to rise in a cylinder, the piston being so connected by
a lever or Beam to a second piston attached to the valve-spindle that the latter
with its valve will be depressed and the admission of steam reduced.
.
According to my invention I form in the casing immediately above the valve
seating a cylindrical chamber in which fits steam tight a plunger or piston connected
to the valve spindle.
The latter is prolonged above the piston and connected near its end to one end
of a lever or beam by a suitable slotted joint.
The fulcrum or pivot of this lever or beam passes through a block which is
capable of sliding in a slot made in the said lever or beam and the other end thereof
is connected to a rod at the lower end of which is a piston or plunger fitting steam
tight into a second cylinder or chamber formed in the top of the valve casing and of
twice the area of the piston or plunger before named.
The fulcrum or pivot of the lever or beam is carried by a block which is capable
of sliding in a cap fixed on the valve casing and which is provided with a bush or
nut through which passes a screwed rod fitted with a suitable handle or wheel by
means of which the fulcrum or pivot can be adjusted in the slot of the lever or
beam, thereby regulating with the utmost accuracy the reduction of the steam or
other pressure.
or rod
Immediately above the top of the valve spindle I mount a screwed spindle
passing through a bush carried by a suitable bridge piece, so that when required
this screwed spindle can be turned and brought to bear upon the upper end of the
valve spindle in order to close the valve, which can be used therefore both as a
reducing valve or a stop valve.
:
It will be seen that the steam pressure acting beneath the piston or plunger of
larger area will raise the same and automatically reduce the pressure from the
generator by depressing the valve which is attached to the piston or plunger of
smaller area, and the reduced pressure will be a constant proportion of the initial
area the said proportion being regulated by the movable fulcrum.
The working parts' also, being all fitted above the pistons or plungers, will not be
interfered with by the action of the steam or other pressure.
Dated this 12th day of January 1893.

page_text: COMPLETE SPECIFICATION.
Improvements in Pressure Reducing Valves.
I WILLIAM THOMAS ELLISON Junior of 12 King Street, Irlams-o'-th'-Height,
formerly of 34 Zachariah Street, Eccles New Road, Salford in the County of
Lancaster, 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 the construction of what are known as reducing valves
for regulating the pressure of steam or other fluid, my object being to obtain
variable pressures, and so regulate the same that should the initial pressure from
the generator be decreased the reduced pressure will still be a constant proportion
thereof.
My invention relates to that class of valve in which the reduced pressure is
obtained by causing a piston to rise in a cylinder, the piston being so connected
by a lever or beam to a second piston attached to the valve spindle that the latter
with its valve will be depressed and the admission of steam reduced; and the same
will be readily understood from the following description on reference to the
accompanying drawings.
Fig. 1 is a side elevation in section of one of my improved valves, Fig. 2 is an
end elevation thereof and Fig. 3 a section through about the centre of the cap
thereof.
. According to my invention I form or fix in the casing a immediately above the
valve seating a¹ a cylindrical chamber 6 in which fits steam tight a plunger.or
piston c connected to the valve spindle d.
The latter is prolonged above the piston c and connected near its end to one end
of a lever or beam f by a suitable slotted joint at f¹.
The fulcrum or pivot of this lever or beam fpasses through a block f' which
is capable of sliding in a slot made in the said lever or beam f and the other end
thereof is connected to a rod g at the lower end of which is a piston or plunger g¹
fitting steam tight into a second cylinder or chamber h formed or fixed in the top
of the valve casing a and of twice the area of the piston or plunger c before
named.
The fulcrum or pivot of the lever or beam f is carried by a block i which is
capable of sliding in a cap k fixed on the valve casing a and which is formed or
provided with a bush or nut i through which passes a screwed rod fitted with a
suitable handle or wheel by means of which the said fulcrum or pivot can be
adjusted in the slot of the lever or beam f thereby regulating with the utmost
accuracy the reduction of the steam or other' pressure.
Immediately above the top of the valve spindle d I mount a screwed spindle or
rod m passing through a bush carried by a suitable bridge piece, so that when
required this screwed spindle m can be turned and brought to bear upon the upper
end of the valve spindle d in order to close the valve which can be used therefore
both as a reducing valve or a stop valve. The recessed end of the spindle or rod m
will also form a guide to ensure the vertical position of the spindle d, see Fig. 1.
I prefer also to prolong the rod 9 of the piston or plunger g¹ and pass it through
a bush or guide in the cap see Fig. 1 and thus the vertical position of the said
rod g is ensured.
It will be seen that the steam pressure acting beneath the piston or plunger (g)
of larger area will raise the same and automatically reduce the pressure from the
generator by depressing the valve which is attached to the piston or plunger cof
smaller area, and the reduced pressure will be a constant proportion of the initial
area the said proportion being regulated by the movable fulcrum.
The working parts also, being all fitted above the pistons or plungers, will not
be interfered with by the action of the steam or other pressure.

page_text: 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. The combination with the two pistons of a reducing valve of the kind herein-
before described, of a slotted lever or beam, pivotted to a sliding fulcrum carried
by a block and nut, and regulated by a screw substantially as herein before described
and illustrated by the annexed drawings.
2. In a reducing valve provided with two pistons acting as herein before
described the combination with the piston of the valve spindle of a screwed spindle
for closing the valve, which can thus act as a reducing valve or a stop valve
substantially as hereinbefore described and illustrated by the annexed drawings.
Dated this 12th day of October 1893.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant