Improvement in Stop Valves.
Year: 1898

page_text: Date of Application, 21st Jan., 1898-Accepted, 19th Mar., 1898
COMPLETE SPECIFICATION.
Improvement in Stop Valves.
WILLIAM CRAIG, Mechanical Engineer, of 1055, Herkemer Street, in the City of
Brooklyn, County of Kings, State of New York, United States of America, and
HUGO B. ROELKER, Mechanical Engineer, 43, W. 97th Street, of the City of New
York, County of New York, State of New York, United States of America, 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 stop valves of the puppet kind and consists in the novel
means hereinafter described and claimed, whereby the opening and closing of a
valve of the largest size controlling fluids of the highest pressures, may be effected
very easily and under the most perfect control, by the manipulation of small valves
or cocks, and whereby also such a valve is caused to close automatically but
slowly, in case of the bursting at any point, beyond the valve of the pipe the
opening and closing of which the valve is intended to control.
Figures 1, 2, and 3 represent central sections of the different examples of a
valve, and its accessories embodying this invention. Figure 4, is an outside view
of the same valve which is represented in Fig. 3. In all figures, A designates the
at the other end, and
valve casing, having an inlet a at one end, and outlet
having a seat c for the valve B near its inlet, and directly between the inlet and
outlet.
Between the valve seat c and the outlet end b of the casing A, there is centrally
located within the casing A and concentric with the valve seat ca stationary
cylinder C, the bore of which is larger than the circumference of the outer edge of
the bevel of the valve B and its seat, sufficient room for the passage of the steam or
other fluid is given inside the casing, around the circumference of this cylinder.
To this cylinder which may be called the power cylinder, is fitted a piston D which
is connected positively with the stem d of the valve B. Both ends of the cylinder
are closed by solidly cast or bolted heads and made tight or provided with small
openings as the special purpose of the valve may require. A small passage F
leads from or both ends of the interior of the cylinder to the outside of the valve
case A.
In all of the valves small bye-pass pipes, controlled by small cocks or
valves, lead from one or both ends of the power cylinder to the space between the
inlet end a and the valve B; and also permit an escape of pressure from the
cylinder C at will.
In Fig. 1, the rear head of the cylinder C is shown cast in solidly and the front
head C¹ is bolted, and has one or more small openings h.
The piston rod e passes loosely through the front cylinder head and outside the
same is rigidly joined by means of 2 crossheads g and G, and tie rods H to the
valve stem d of the valve B. A small pipe L with a 3 way cock LI connects
with passage F from the rear end of the cylinder with the space between the inlet
end a of the valve casing A and the valve seat c, and it also connects by means of
this same 3 way cock with the pressure escape pipe l.
Another small pipe K provided with a shut off valve K' leads from the same
space in the valve casing above the valve B to the space below the valve B.

page_text: heads of the power cylinder being tightly closed, the only connection to the interior
of this cylinder is through the channels F1 F2 and the 4 way cock or valve K¹. If
the valve is to be opened against a pressure on the back of the main valve B, and
to be held open against the current of fluid rushing from left to right. The cock or
valve K is opened and K2 is closed, and the 4 way cock is placed in the position
shown in the drawing, Fig. 3. Then the pressure in the space back of the valve B
will rush throngh the cock K and pipe L and the opening in the plug of the 4
way cock K and through the passage F2 into the front end space of the power
cylinder C, while the rear space of the power cylinder is brought into connection
with the pressure escape opening k through passages F1 and 3 and the piston D
being of larger diameter than the valve B, will move the valve from its seat and
will hold it open.
If the main valve B is to be closed against a fluid under pressure rushing from
right to left, the cock K is closed and the cock K2 is opened, then the 4 way
cock is moved by the lever about 90 degrees from the position shown on the
drawing, when it will connect the front end of the power cylinder C with the
pressure escape k' and the rear of the cylinder with the pressure at the nozzle b.
The piston D will then move the valve to its seat and hold it there.
These valves may be placed one on each of a battery of boilers, between the
boilers and the main steam pipe and may each be closed off separately at will by
the turning of the cock handles whether the greater pressure be in the boiler or in the
steam pipe. Or all the valves may be closed by one operation of a handle if their
cocks K and K2 are kept open as shown on the drawing, and the handles of their
This
cocks are by a simple connection to all of them, at once thrown over.
way
is of great importance in case of an accident to any one of the boilers or to the
steam pipe or the machinery.
4
Having now particularly described and ascertained the nature of this
invention and in what manner the same is performed we claim as our inven-
tion:-
1. The combination of a valve casing, a puppet valve and a seat therefor within
said casing, a power cylinder having an area larger than said valve located within
said casing between the valve and the outlet, the end of said cylinder next the
valve being closed to the casing and the other end being open thereto, a piston in
said cylinder, a connection between said piston and said valve, a bye-pass forming
communication between the portions of the casing on opposite sides of the valve
seat, and means for closing said bye-pass and for opening it for the admission of
fluid from the inlet side of the valve seat to the outlet side thereof and to the open
end of the cylinder for opening the valve, substantially as herein described.
2. Te combination of a valve casing, a puppet valve and a seat therefor within
said casing, a power cylinder located within said casing between the valve and the
outlet, the end of said cylinder next the valve being closed to the casing and the
other end being open thereto, a piston in said cylinder, a connection between said
piston and said valve, a bye-pass communication between the portion of the casing
on the inlet side of the valve and the said closed end of the power cylinder and
means for closing said bye-pass and of opening it for the introduction of fluid from
the inlet side of the valve to said cylinder for closing the valve, substantially as
herein described.
3. The combination of a valve casing, a puppet valve and a seat therefor within
said casing, a power cylinder and piston located within said casing between the
valve and the outlet, the end of said cylinder next the valve being closed to
the casing and the other end having contracted openings to the casings for the
cushioning of the fluid between it and the piston, a connection between said piston
and valve, a bye-pass forming communication between the portion of the casing
on the inlet side of the valve and the said closed end of the power cylinder,
and means for closing and opening said bye-pass, all substantially as herein
described.