An Automatic Stop Valve.
Year: 1891

page_text: Date of Application, 9th June, 1891
Complete Specification Left, Sth Mar., 1892-Accepted, 9th Apr., 1892
PROVISIONAL SPECIFICATION.
An Automatic Stop Valve.
I, THOMAS FOGG of 25 Ash Street, Great Lever near Bolton in the County of
Lancaster, Engineer, do hereby declare the nature of my said invention to be as
follows:-
The object of my invention is to provide an automatic stop valve that will shut
off steam, water, gas, and other liquids under pressure in case the supply fails or a
pipe bursts, thereby preventing accidents, loss of life, and other damage. This
effect by coupling to the ordinary stop valve spindle or its equivalent a pivoted
lever or a series of levers, links, or other mechanism connected to a piston niounted
in a cylinder fixed on the outlet pipe. If desired a separate stop valve can be fixed
in juxtaposition to the main stop valve, being controlled or operated by the
mechanism described above. To set the automatic apparatus in motion it can be
operated by hand to allow an escape of pressure to operate the piston to open the
main valve to its full extent, or a by pass and tap or other means can be provided
for the purpose.
In case a pipe bursts or the pressure fails the piston is operated in
a contrary direction by a weight, spring, or other means to close the stop valve it is
connected to, thereby automatically shutting off steam, water, gas, and other liquids
under pressure and dispensing with the disastrous results that might take place if
unchecked.
Dated the 8th June 1891
EDMUND CHADWICK,
A cont
COMPLETE SPECIFICATION.
An Automatic Stop Valve.
1, THOMAS FOGG of 25 Ash Street, Great Lever near Bolton in the County of
Lancaster, Engineer, do hereby declare the nature of my said invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
The object of my invention is to provide an automatic stop valve that will shut
off steam, water, gas, and other liquids under pressure in case the supply fails or a
pipe bursts, thereby preventing accidents, loss of life, and other damage. This I
effect by coupling to the ordinary stop valve spindle or its equivalent a pivoted
lever or a series of levers, links, or other mechanism connected to a piston mounted
in a cylinder fixed on the outlet pipe. If desired a separate stop valve can be fixed
in juxtaposition to the main stop valve, being controlled or operated by the
mechanism described above. To set the automatic apparatus in motion it can be
operated by hand to allow an escape of pressure to operate the piston to open the
niain valve to its full extent, or a by pass and tap or other means can be provided
for the purpose.
In case a pipe bursts or the pressure fails the piston is operated
in a contrary direction by a weight, spring, or other means to close the stop valve
it is connected to, thereby automatically shutting off steam, water, gas, and other
liquids under pressure and dispensing with the disastrous results that might take
place if unchecked.

page_text: A is the stop valve; B the inlet pipe, and C the outlet pipe. To the outlet
pipe C is fixed the cylinder D in which operates the piston E by the pressure
underneath the same in the outlet pipe. To the piston E is coupled the valve
lever G by the link or connecting rod H and pins or centres I. On the cylinder D
is mounted the guide J to maintain the lateral position of the valve lever G in its
up and down movements. The latter is provided with the boss N through which
passes the adjusting screw secured by the nuts L and lock-nut M. To one end
of the screw is attached the spring P, the other end of the latter being secured
to the lug R on the pipe C.
This invention operates as follows:- To set this automatic stop valve in motion
when the valve is shut it is effected by lifting the outer end of the lever G by hand, or,
by opening the by pass valve or tap S connected to the inlet pipe B and outlet
pipe C by the pipes T. Immediately pressure is admitted to the outlet pipe C the
piston E is forced up the cylinder D to hold open the stop valve A as shown in
Fig. 1. The resistance on the outside of the piston E can be regulated to any
degree by the sliding weight V on the lever G and the spring P and screw K. In
case a pipe bursts or the pressure fails in the outlet pipe or pipes C the spring P
and weight V forces down the piston E in the cylinder D and closes the valve A,
by which steam, water, gas, or liquids under pressure will be shut off, and the risk
to life and property prevented. This invention is well adapted for steam pipes
connecting steam boilers and engines employed for driving mills, works, vessels,
collieries, and other purposes, also in connection with pipes for heating rooms and
other places.
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 :-
In combination with a stop valve actuated by a lever the use of the cylinder D),
piston E, link or connecting rod H, coupled to the lever G, spring P, and adjustable
screw K, for the purpose specified, substantially as described.
Dated the 3rd March 1892.
EDMUND CHADWICK,
Agent.