Improvements in Fluid Pressure Reducing Valves.
Year: 1892

page_text: Date of Application, 9th May, 1892
Complete Specification Left, 9th Feb., 1893—Accepted, 1st Apr., 1893´
PROVISIONAL SPECIFICATION.
Improvements in Fluid Pressure Reducing Valves.
1, ALEXANDER SHIELS, of 190 Bath Street, Glasgow, M.B., C.M., B.Sc., do
hereby declare the nature of this invention to be as follows:-
This invention relates to fluid pressure reducing valves, and it has for its object
to improve their construction.
In constructing my improved reducing valve, I use a hollow casing or chamber,
which is provided with an inlet branch and an outlet branch, and made with valve
seats in its interior. Working in the chamber, is a double-beat valve. The spindle
of the valve is connected, at its upper end, to, or made one with, a plunger, which
passes through a stuffing box on the chamber. The plunger is made heavy enough
(or has a weight or weights, or equivalent, attached to it) to keep the valve open
at the desired reduced pressure, but to close, when that pressure is exceeded. The
spindle of the valve is guided in the usual manner.
The operation of the valve is, as follows:-Supposing the weighted plunger. is
10 lbs., the valve will remain open so long as the pressure in the outlet branch.
does not exceed 10 lbs., but, immediately the pressure, in that branch, exceeds 10 lbs.,
it will force up the plunger, and so close the double-beat valve. The valve opens
again, immediately the pressure falls below the 10 lbs., so as to admit more fluid,
at a higher pressure, from the inlet branch. The valve is automatic in its action.,
Instead of having a plunger, a piston and a weight or a spring, to produce the
requisite pressure on the valve, may be used, or the piston itself may be weighted.
In some cases, a lever and a sliding or adjustable weight, may be used to create the
pressure on the valve.
J
If desired, the spindle may be carried through the casing, and have means for
attaching a weight or weights to it. .
Dated thin 7th CM 1005
H. D. FITZPATRICK:
Glasgow and London, Agentu
.0
COMPLETE SPECIFICATION.
Improvements in Fluid Pressure Reducing Valves.
I, ALEXANDER SHIELS, of 190 Bath Street, Glasgow, M.B., C.M., B.Sc.,
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 fluid pressure reducing valves, and it has for its object
to improve their construction.
In constructing my improved reducing valve, I use a hollow casing or chamber,
which is provided with an inlet branch and an outlet branch, and made with valve
seats in its interior. Working in the chamber, is a preferably double-beat valve.
The spindle of the valve is connected, at its upper end, to, or made one with; a
plunger, which may pass through a stuffing box in the chamber. The plunger is
made heavy enough (or has a weight or weights, or equivalent attached to it) to
keep the valve open at the desired: reduced pressure, but to close, when that pressure
is exceeded: The spindle of the. valve is guided in the usual manner.
Instead of having a plunger, a piston and a weight or a spring, to produce the
requisite pressure on the valve, may be used, or the piston itself, may be weighted.
[Price 8d.1

page_text: In some cases, a lever and a sliding or adjustable weight may be used to create the
pressure on the valve.
If desired, the spindle may be carried through the casing, and have means for
attaching a weight or weights to it.
The valve is automatic in its action.
And in order that my said invention may be properly understood, I have
hereunto appended, by way of illustration, an explanatory sheet of drawings;
whereon
Fig. 1. is a longitudinal section, through a central plane, of the reducing, valve.
Fig. 2 is a cross section on the line -, Fig. 1.
Fig. 3 is a side elevation of the valve.
Fig. 4 is a part section of a modification of the valve.
Fig. 5 is a part section of another modification of the valve.
Referring to the drawings, whereon the same reference letters, wherever repeated,
indicate similar or like parts.
e,
The valve consists of a cast-metal chamber or casing a, which has the usual inlet
passage way b, and outlet passage way c in it. Fitted in the chamber is a double-
beat balanced valve d, d. el are valve seats. The two rings e are connected
together by, preferably, four pillars f. The object of having the pillars is to
ensure an equal expansion in both seats in order that the distance between the
seats may be constant and relative to the valves which are made of the same metal,
preferably gun metal. g is the valve spindle. h is a priming disc screwed on the
valve spindle. i is a hollow piston, fitted on the upper end of the valve spindle
and open to the atmosphere on the top side. j is a guide piece secured in the
plate k. is a lever, which, at one end, is pinned to the top of the valve spindle,
and, at the other end, is fulcrumed to a link m secured to a bracket n, fitted on the
valve casing a. p is a spring, which, as shown at Fig. 3, is secured at the side of
the valve. This spring, bears at its upper end against the bracket n and normally
tends to pull down the rod o and lever . The lower end of the rod o passes freely
through a hole a' in the projection a cast on the casing a. The spring is of the
tension required to give the reduced pressure.
Instead of having a spring p a weight may be used in lieu thereof, as shown at
Fig. 5. The weight may be attached to a sling q and be capable of sliding along
the lever so as to give different pressures or it may be merely hooked to the end
of the lever. (Fig. 5) is a guide piece. In this figure the lever and link m
are arranged differently from Figs. 1 and 3 and the bracket n is dispensed with.
A screw plug k¹ is also used instead of the plate k and the piston i is shown
pinned to the spindle instead of being screwed thereon.
In Fig. 4 the spindle is shown enlarged at its upper end g¹ so as to serve as a
plunger. The plunger g¹ works through a stuffing box s.
The construction of valve may be further altered to suit different requirements.
The action of the valve is as follows:-
Supposing steam, or other fluid, is supplied to the inlet branch b at a pressure of
say 60 lbs. per sq. inch and it is desired to reduce the pressure to 10 lbs. per
sq. inch, then, as the initial pressure of 60 lbs. in the inlet 6 does not affect the
movement of the valve as the discs d, d are of the same area, it follows that all
that is necessary is to load the spindle to such an extent that the downward
pressure on said spindle will balance a reduced pressure in the outlet c, of 10 lbs.
per sq. inch, acting on the underside of the pistoni or plunger g¹ and tending to
force the spindle upwards, against the downward pressure of the load, and close the
valve.
When the spindle has been loaded to such an extent as to counterbalance the
action of the reduced pressure on the piston i or plunger g¹, it follows, that if
the reduced pressure by any means rises above the 10 lbs. then its action on the
piston or plunger will be sufficient to force up the spindle and close the valve.
Immediately the reduced pressure falls down to the proper limit the valve opens
again. Should the reduced pressure fall down below the. 10 lbs. limit then the
L

page_text: action of the load will cause the valve to open further and supply more fluid at a
higher pressure from the inlet b.
If so desired the spindle may be carried through the bottom of the valve casing
and be weighted at its lower end.
If desired, in some cases, the plunger or piston may be made heavy enough to
serve as the load.
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. A fluid pressure reducing valve wherein the exit fluid, at a reduced pressure,
in combination with a load which acts on the valve or valve spindle is made to
automatically control the supply of the entering fluid at the initial pressure,
substantially as hereinbefore set forth.
2. In a fluid pressure reducing valve, the combination with the valve spindle of
a piston or plunger which is acted on by the reduced pressure of the exit fluid,
substantially as and for the purpose hereinbefore set forth.
3. A fluid pressure reducing valve constructed and operating, substantially as
hereinbefore described and shown under modified constructions on the drawings
annexed.
Dated this 8th day of February 1892
H. D. FITZPATRICK,
Glasgow and London, Agent.