Improvements in Safety Water Gauge Cocks.
Year: 1889

page_text: Date of Application, 26th June, 1889-Accepted, 27th July, 1889
COMPLETE SPECIFICATION.
Improvements in Safety Water Gauge Cocks.
We NELS AUGUST SVENSSON, Machinist and PETER RUSS Manufacturer both of
Lübeck in the free state of Lübeck and German Empire 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 :-
The object of this invention is to prevent the steam and hot water from issuing
from the boiler when a gauge glass breaks.
According to this invention we insert valves in the passages leading from the stop
cocks to other casings in which the glasses are inserted.
In the accompanying drawing Fig. 1 shews elevation partly in section of the upper
gauge cock, Fig. 2 similar view of bottom gauge cock. Figs. 3 and 4 are sections
through the plugs of the gauge cocks.
In the passages between the gauge glass casings C and the stop cocks A A' which
open or close the communication between the said casings and the boiler are inserted
valves D which close as soon as there is an excess of upward pressure under the
said valves but which open and remain open when the pressure on both sides of
the valves is equal.
Under working conditions the water and steam from the boiler pass through these
valves but should a gauge glass break the equilibrium being destroyed the pressure
of steam in the boiler lifts the valves, prevents the further escape of steam and
water and minimises the risk of danger to the attendant.
The stop cocks A A¹ are provided with suitable handles and each plug has two
passages b and facing one another so that upon the removal of the screws B B' the
passage to the boiler may be cleaned if the plug is turned so that the passages bb¹
open communication between the passages a and a¹.
At right angles to these passages and on the same level therewith is another passage c.
Now when the passage c corresponds with the passage a (see Fig. 1) the aperture d
opposite to c but at a lower level corresponds with the passage e in the casing U
allowing steam and water to pass round the valves D and D¹ to the gauge glass.
To enable these valves to act properly it is necessary to admit the full pressure at
starting (and after blowing out) to the gauge glass above the valves through the
passages 66 to open the same when they will remain open until closed by a sudden
fall of pressure in the glass.
To ensure the valves being in working order frequent blowing out is necessary to
remove any scum or grit that may accumulate round the valves D D'. As opening
the cock in the usual way will not effect this, such opening merely closing the
On either of the
valves D D special cocks E E¹ are provided for blowing out.
cocks A A' being turned till the aperture corresponds with the passage e (see Fig. 2)
and at the same time the outlet cock E or E' is opened steam or water passes through
the valve casing and escapes through the passage g or g¹ of the cock E or E' thus
clearing away all dirt.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed we declare that what we claim is :-
1st. The employment of cocks A A¹ with passages b b c d f and g and of a
valve D to prevent the escape of water and steam from the boiler when the gauge
glass breaks substantially as described.

page_text: 2nd. The employment of waste cocks E in combination with passages ƒ and g of
the cocks A A¹ to facilitate clearing the valve D substantially as described.
3rd. Safety water gauge cocks substantially as set forth.
Dated this 26th day of June 1889.
BROWNE & Co.,
9 & 10, Sonthampton Buildings, London, W.C., Agents for the Applicants.