Improvements in Steam and other Valves.
Year: 1890

page_text: Date of Application, 5th Feb., 1890
Complete Specification Left, 5th Nov., 1890-Accepted, 6th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in Steam and other Valves.
I, MARK HEATON ROBINSON, of Chatley, Fassett Road, Kingston-upon-Thames. in
the County of Surrey, Engineer, do hereby declare the nature of this invention to be
as follows:-
This invention has for its object to reduce the inconvenience which may arise
through. imperfect tightness in stop-valves in steam & other pipes, & in similar
situations.
One mode of effecting this is applicable to valves of the class in which (as in the
well-known "Peet" valve) there are two plates or diaphragms, pressed outwards by
internal wedges or screws, against facings surrounding the inlet & outlet openings,-
or, where there is one plate or diaphragm which presses against both such facings,
owing to its wedge form. In such cases I form the body of the valve with a small
opening, capable of being closed by a cock or otherwise, so as to place the space
between the two faces of the valve in communication, when desired, with the
atmosphere, or with any pipe or vessel into which a leak of steam or other fluid from
the valve may conveniently be directed. When it is desired to cut off communication
by closing the valve, the cock which usually closes the hole referred to may be
opened. The steam which may leak past that face of the valve which is pressed
against the inlet will then escape without accumulating sach pressure as might enable
it to establish a leak past the outlet face also.
In valves of other construction, where each hand-wheel or equivalent mechanism
acts to bring a single valve into contact with only one facing, or where it is desired to
obtain greater security with valves of the kind already described, two complete valves
may be contained in one casting, with a small space between them, the opening before
referred to being made into this space.
It is obvious that this plan may be applied with advantage to valves in all positions
where a leak from the valve to the outside is less objectionable than a leak through
the valve into the pipe or other receptacle beyond.
The leak-opening in the body of the valve may, in pipes for steam, compressed
air, &, be arranged to serve as a drain for the removal of water, by connection with
an automatic trap or otherwise.
Dated this Fourth day of February 1890
COMPLETE SPECIFICATION.
Improvements in Steam and other Valves.¨
I, MARK HEATON ROBINSON, of Chatley, Fassett Road, Kingston-upon-Thames, in
the County of Surrey, Engineer do hereby declare the nature cf 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 its object to reduce the inconvenience which may arise
through imperfect tightness in stop-valves in steam & other pipes, & in similar
situations.
In valves of the class known as "full-way," in which there are two plates or
diaphragms pressed outwards by internal wedges, screws, or springs, against facings
surrounding the inlet & outlet openings, or where there is one plate or diaphragin
which presses against both such facings owing to its wedge form, I form the casing or
body of the valve with a hole or small opening, capable of being closed by a cock or
otherwise, so as to place the space between the two faces of the valve in communication

page_text: when desired, with the atmosphere, or with any, pipe or vessel into which a leak
of steam or other fluid from the valve may, conveniently be directed. When it is
desired to cut off communication, between the two sides of the valve, by closing it,
the cock which usually closes the leak-hole referred to may be opened.. The steam or
other fluid which may then leak past that face of the valve which is exposed to the
higher pressure will then escape by the leak-hole without-accumulating sufficient
pressure to enable it to establish a leak past the other face of the valve as well. It is
obvious that this plan may be applied with advantage to valves in all positions where
a leak from the valve to the outside is less objectionable than a leak through the valve
into the pipe or other receptacle beyond.
In valves where each hand-wheel & screw, or equivalent mechanism, acts to bring
only a single valve into contact with a single facing (as in ordinary screw-down
valves) two complete valves may be combined in one casting, or otherwise, with a
small space between them, the leak-opening before referred to being made into
this space.
Figure 1 shews a section through so much of an ordinary full-way valve as
is required to explain the invention. A is the body of the valve; B, B₁ are valves
pressed outwards against the faces C, C; D is the leak-hole, closed by a cock E, to
which a drain-pipe F is shewn connected. If B be the valve exposed to the higher
pressure, it is evident that leakage past it will be carried away by the pipe F, and will
not be able to establish a leak past B' as well.
The cock E may evidently be used also as an ordinary drain, for removing water of
condensation, &c., from a pipe used for conveying steam or other gaseous fluid.
Fig. 2 shews two ordinary screw-down valves combined in one casting, with a
leak-hole D, and cock E, to carry off leakage as above explained.
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
1. The use of a leak-hole, with suitable means of closing the same, in the body of a
valve having two working faces as described, so arranged as to carry away any fluid
which may leak past one of the faces (when the valve is closed) into the space
between the two faces.
2. The combination of two valves of any kind in one casting, or otherwise in
immediate connection with each other, with a leak-hole froin the space between the
two valves, so arranged as to carry away any fluid which may leak past one of the
valves (when both are closed) into the aforesaid space between them.
3. The use of a leak-hole in valves, arranged substantially as, and for the purpose,
.described
Dated this Fourth day of November 1901