Year: 1888

page_text: 1 GEORGE PETRIE of Phoenix Foundry Rochdale in the county of Lancaster
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to taps or cocks and is particularly applicable to those taps
or cocks which are to be employed as "blow off cocks". for use in conjunction with
steam-boilers and my invention consists in arrangements by which I prevent the cock
or tap from being injured by the action of dirt, grit, scalo or sediment which may be
doposited within such cock or tap.
In carrying my invention into effect I form the plug of the tap or cock with a
part which when the plug is turned into a certain position within the body of the tap
or cock prevents the passage of liquid or fluid through the exit passage of the said
tap or cock. The part above referred to also prevents dirt, grit, scale or sediment
from acting upon those parts of the surfaces of the "plug" and "
"of the tap
body
or cock by which liquid or fluid is prevented from flowing through such tap or cock
when such tap or cock is "shut."
I form the plug above referred to with surfaces which are in contact with other
surfaces formed upon the body of the tap or cock which surfaces prevent liquid or
fluid from escaping between the ends of the plug and the "casing" in which such
plug is situate.
23
<
I retain the plug before mentioned within the "casing" of the tap or cock by
means of a flange or cover secured to the body of the tap or cock in any suitable and
convenient manner and I provide. the said cover or flange with a suitable "stuffing
box or glund" through which the "spindle" of the plug passes or the said plug
may be retained in the "casing or body" of the tap or cock by means of a nut
and washer upon the end of the plug. In order to strengthen the plug above
mentioned I form a stay or strut extending in the direction of the length of the said
1137
33

page_text: plug. When the plug is turned within the "casing" to "open "the tap or cock
the surface of the plug which closed the exit opening of the tap or cock is turned
away from such opening so as to leave a clear and unobstructed passage through the
tap or cock for liquid or fluid.
In order that the part of the plug which closes the exit opening of the tap or cock
may not be injured by dirt, grit, scale or sediment 1 form a rocess or cavity within
the casing of the tap or cock.

page_text: I, GEORGE PETRIE of Phoenix Foundry, Rochdale in the County of Lancaster Engineer
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:-
My invention relates to taps or cocks and is particularly applicable to those taps
or cocks which are to be employed as "blow off cocks" for use in conjunction with
steam-boilers and my invention consists in arrangements by which I prevent the cock
or tap from being injured by the action of dirt, grit, scale or sediment which may be
deposited within such cock or tap.
In carrying my invention into effect I form the plug of the tap or cock with a part
which when the plug is turned into a certain position within the body of the tap or
cock prevents the passage of liquid or fluid through the exit passage of the said tap
or cock. The part above referred to also prevents dirt, grit, scale or sediment from
acting upon those parts of the surfaces of the "plug" and "body" of the tap or
cock by which liquid or fluid is prevented from flowing through such tap or cock
when such tap or cock is "shut." I form the plug above referred to with surfaces
which are in contact with other surfaces formed upon the body of the tap or cock
which surfaces prevent liquid or fluid from escaping between the ends of the plug
and the "casing" in which such plug is situate. I retain the plug before-mentioned
within the "casing" of the tap or cock by means of a flange or cover secured to
the body of the tap or cock in any suitable and convenient manner and I provide the
said cover or flange with a suitable "stuffing box" or gland" through which the
"spindle" of the plug passes or the said plug may be retained in the "casing" or
body" of the tap or cock by means of a nut and washer upon the end of the plug.
In order to strengthen the plug above-mentioned I form a stay or strut extending in
the direction of the length of the said plug-When the plug is turned within the
"casing" to tr open".the tap or cock the surface of the plug which closed the exit
opening of the tap or cock is turned away from such opening so as to leave a clear
and unobstructed passage through the tap or cock for liquid or fluid. In order that
the part of the plug which closes the exit opening of the tap or cock may not be
injured by dirt, grit, scale or sediment I form a recess or cavity within the casing of
the tap or cock.
r
The accompanying drawings show a tap or cock constructed according to my
invention Fig. 1 is an end view, Fig. 2 a plan and Fig. 3 a vertical section taken in
the plane indicated by the line A A of Fig. 1. Fig. 4 is a horizontal section taken
on the plane indicated by the line B B of Fig. 1 and Fig. 5 is a horizontal section
taken on the plane indicated by the line C C of Fig. 1. The same letters of reference
are applied to corresponding parts throughout the whole series of figures.
a is the body or casing of the tap or cock and 6 is the plug of the tap or cock.
The plug bis retained within the casing a by the cover or flange c secured to the

page_text: casing a by means of the set screws d. In the cover or flange c and around the
spindle of the plug bis a packing fretained in position by the gland g and studs h
and nuts I form the plug 6 with a part 6 which when the plug bis turned so as
to occupy the position in which it is shown in Fig. 4 prevents the passage of liquid
or fluid through the exit passage D of the tap or cock in the direction indicated by
the arrow E. The part also prevents dirt, grit scale or sediment from acting
upon the parts of the surfaces of the plug 6 and the parts a¹ of the surfaces of the
casing a of the tap or cock by which liquid or fluid is prevented from flowing through
such tap or cock when such tap or cock is "shut.” I form the plug b with surfaces 6*
which are in contact with other surfaces a formed upon the casing a of the tap or
cock which surfaces 6 and a² prevent liquid or fluid from escaping between the ends
of the plug and the casing a-I form the plug 6 with a hollow interior 6* which
when the plug b is turned in "opening" the tap or cock is placed in communication
with the inlet passage D' and outlet passage D of the tap or cock.
In some cases I propose to retain the plug b in the casing or body a of the tap or
cock by means of a nut and washer upon the lower end of the plug b.
In order to strengthen the plug b'I form a stay or strut 6 extending lengthwise of
the plug b.
When the plug is turned within the casing a to open the tap or cock the said
plug bis turned into the position in which it is shown in Fig. 6 which is a horizontal
section taken on the plane indicated by the line B B of Fig. 1 so that a clear and
unobstructed passage will be left through the tap or cock for the passage of liquid or
fluid. In order that the part which closes when the tap or cock is shut the exit
opening D of the tap or cock may not be injured by dirt, grit, scale or sodiment I
form a recess or cavity F within the casing a of the tap or cock. I form a groove G
in the cover or flange c such groove G being in the form of an arc of a circle the centre
of which is in the axis of the plug b-In the plug 6 I fix a pog kone end of which
projects into the groove G. When the plug b is turned in the direction indicated by
the arrow H the peg arriving against the end G₁ of the groove G will arrest the
turning of the plug when the cock or tap is open to the fullest extent.
the plug 6 is turned in the direction opposite to that indicated by the arrow H
the motion of the plug 6 will be arrested when the cock or tap is closed.
Whon.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is :-
The hereinbefore described arrangement of tap or cock in which the plug of the
tap or cock is provided with a part such as 63 and a hollow interior such as 66 and the
body or casing of the tap or cock is provided with a recess or cavity such as F
for the purpose of preventing injury from dirt, grit, scale or sediment deposited within
the tap or cock to the surfaces of the plug and body or casing by which the passage
of liquid or fluid through the tap or cock is prevented when the tap or cock is shut."
Dated this Second day of January 1889.