Improvements in Automatic Stop Valves.
Year: 1896

page_text: Date of Application, 12th Aug., 1896-Accepted, 31st Oct., 1896
COMPLETE SPECIFICATION.
Improvements in Automatic Stop Valves.
I, FRANK HENNEBÖHLE of Erie Avenue, South Chicago, Cook County,
Illinois, U.S.A., Manufacturer, 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 has for object to provide an automatic stop safety valve adapted
for automatically shutting off fluid pressure when a leak occurs in the delivery
pipe, and the object is also to enable the same construction of the valve to be
used by merely reversing its position so as to make the inlet the outlet-as an
automatic stop safety valve for air reservoirs, to effect the stoppage of machinery,
driven by compressed air from a reservoir, when the pressure in the latter falls
below a certain point.
In the accompanying drawing
Fig. 1 is a sectional elevation of the valve of this invention on line 1 of Fig. 2
and viewed in the direction of the arrow.
Fig. 2 is a section on line 2 of Fig. 1 and viewed in the direction of the arrow.
Fig. 3 a vertical sectional elevation with a weighted lever substituted for the
spring shewn in Fig. 1 for holding the valve to its seat.
the same area.
A is the valve casing, A¹ the valve seat cast in one piece with the casing so
that the plane of the openings o, o, crosses that of the inlet C and outlet D.
The valve B is of the wing valve kind, though other kinds may be used. The
wings extend between the heads r, r', the former of which seats in the outer edge
portion of the opening o whilst the latter closely fits inside the opening o¹, and the
outer surfaces of the heads present the same area and the inner surfaces thereof
Between the inlet and outlet is provided in one side of the shell
an opening 9 surrounded by a threaded collar g', on which is seated the lower
end of a tubular part E by its flange p', a coupling p engaging the thread of the
collar. In the lower portion of the tubular part is formed a chamber B³ for a
piston B' which is connected with a head r of the valve by a winged neck n.
tube E which is preferably cylindrical, is closed at its outer end except for a small
orifice m, and the closed end of the cylinder affords a bearing for a set screw
acting upon a regulating spring F, for which however a weight may be
substituted.
The
An extension of the head r' is presented to the headed end of an adjusting
screw having its bearing in a screw cap which closes an opening opposite the
opening 9.
To use the device for controlling steam pressure by shutting off the supply in
case a leak occurs in the delivery or distributing system, as by the bursting of a
pipe, the spring F is set to tension to overcome any pressure lower than the lowest
pressure at the outlet D where the valve is connected to the delivery pipe whilst
the inlet C is in connection with the steam supply.
The construction of the valve B reuders it a balanced valve whereby when it is
seated the equal pressure against its opposite heads from the inlet, retains it
closed. To fill the delivery from the inlet, the screw k is employed to unseat
the valve B, until the delivery pipe is filled with a pressure equal to the boiler

page_text: pressure, when the screw k is returned to its normal position (as shewn), and the
valve B remains open by reason of the pressure in the casing acting upon the
piston B. Should any serious leak occur in the delivery pipe the consequent
lowering of the pressure therein will reduce it below the tension of the spring F
and cause the recoil of the latter to force the piston B₁ from its seat and close the
valve B thereby shutting off the supply from the boiler to the delivery.
The orifice m prevents any pressure beyond atmospheric pressure against the
outer surface of the piston.
Where machinery is driven by compressed air supplied to it from a reservoir, it
is important that the pressure in the latter should never be allowed to fall lower
than a certain point, the surplus above which is used for driving the machinery.
To prevent the excessive fall of pressure the valve device is connected at the
opening D with the air reservoir and at the opening C with the delivery to the air
driven machinery. By then setting the spring F to cause the piston B' to effectually
resist the desired minimum pressure in the reservoir, all surplus pressure thereof
will maintain the valve B open by compressing the spring F, which however will
close the valve B whenever the pressure in the reservoir falls to such minimum.
Owing to the operation of the valve device in the last named connection, the
adjusting screw is not required and may be dispensed with when the device is
constructed for that particular use.
The valve device may be placed in any position with equally effective result,
say with the head up (as shewn) or down or at any angle to the position shewn.
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. An automatic stop safety valve comprising in combination, a chamber having
an inlet and an outlet, a balanced valve seating in said chamber to close under a
reduction of pressure therein, a piston extending from said balanced valve and
exposed to the pressure in said chamber, and a regulating spring opposing said
piston to said pressure, substantially as described and shewn.
2. An automatic stop safety valve comprising in combination, a chamber having
an inlet and an outlet, a balanced valve seating in said chamber, to close under a
reduction of pressure therein, a piston extending from said balanced valve and
exposed to the pressure in said chamber, a regulating spring opposing said piston
to said pressure, and a set screw adjustable against the balanced valve to open it in
opposition to said spring, substantially as described and shewn.
3. A valve device comprising in combination, a chamber having an inlet and
an outlet, a balanced valve seating in said chamber, a spring housing extending
from an opening in said chamber and containing near its inner end a piston
chamber, a piston extending from said balanced valve to the piston chamber, and
a regulating spring confiued in the housing and pressing against said piston,
substantially as described and shewn.
4. A valve device comprising in combination, a chamber A, provided with an
inlet and an outlet and containing the valve seat A', a balanced wing valve B
seating in said chamber and carrying at one end a neck n terminating in a piston B'
a tubular spring housing E extending from an opening y in said chamber and
provided at its outer end with a bearing for a set screw / projecting into the housing,
a piston chamber B2 near the inner end of said housing, and a spring F confined in
said housing between the set screw and piston substantially as described and
shewn.
5. A valve device comprising in combination, a chamber A provided with an
inlet and an outlet and containing the valve seat A', a balanced wing valve B
seating in said chamber and carrying at one end a neck n terminating in a piston B',
a tubular spring housing E having an orifice m and extending from an opening
in said chamber and closed at its outer end where it affords a bearing for a set

page_text: screw projecting into the housing, a piston chamber B2 near the inner end of said
housing for the reception of the piston, a spring F confined in said housing between
the set screw and piston, and a set screw k adjustable against the balanced valve
in opposition to said spring, substantially as described and shewn.
Dated this 12th day of August 1896.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.