Improvements in Back-pressure Valves.
Year: 1890

page_text: Date of Application, 28th Mar., 1890
Complete Specification Left, 27th Dec., 1890-Accepted, 21st Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in Back-pressure Valves.
I, ROBERT GRUNDY BROOKE, of St. Simons Works, Salford, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:
My invention relates to improvements in back pressure valves used for preventing
the return flow of fluids and consists in an improved method of arranging and
constructing such valves whereby the valve itself together with its seating can be
withdrawn for examination and repair better and more simply than hitherto.
In one arrangement according to my invention the back pressure valve is, like
ordinary valves of this class, screwed at the inlet end to receive the pipe conducting
the water or other fluid, but I make this screwed portion of the inlet end of my
valve separate from the body part or casing but so arranged that by screwing or
otherwise it may be suitably attached to the body part, and I construct this separate
portion so that it also forms the guide & seating for the valve itself.
Accordingly when this separate piece. forming the inlet end & valve seating
combined is unscrewed or detached from the body portion of the back pressure
valve itself the valve is withdrawn together with its seating & both may be readily
examined & repaired.
The valve is sometimes provided with a projection on its further side to act
either as an additional guide, or as a stop to limit the rise of the valve off its seat
or as both and a suitable projection is provided in the valve body or casing to
receive or meet the projection on the valve.
In the case of back pressure valves in which the pipe is attached to the inlet end
by means of two flanges jointed together the valve seating is made. separate as
before but is not necessarily screwed to receive a pipe. It is suitably constructed
for attachment to the valve body as in the first mentioned arrangement but in case
it projects outwardly beyond the surface of the jointing flange on the body part the
loose flange, which also receives the inlet pipe, is recessed so as to inclose and cover
the projection.
Dated this 27th day of March 1890.
COMPLETE SPECIFICATION.
Improvements in Back-pressure Valves.
I, ROBERT GRUNDY BROOKE, Engineer, St. Simon's Works, Salford,
Manchester, in the County of Lancaster, 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 improvements in back pressure valves used for preventing
the return flow of fluids, and consists in an improved method of arranging and con-
structing such valves whereby the valve itself together with its seating can be
withdrawn for examination and repair better and more simply than hitherto
In one arrangement according to my invention the back pressure valve is, like
ordinary valves of this class, screwed at the inlet end to receive the pipe conducting
the water or other fluid, but I make this screwed portion of the inlet end of my
valve separate from the body part or casing, but so arranged that by screwing or
Price d

page_text: otherwise it may be suitably attached to the body part, and I construct this separate
portion so that it also forms the guide and seating for the valve itself.
Accordingly when this separate piece forming the inlet end and valve seating
combined is unscrewed or detached from the body portion of the back pressure valve
itself the valve is withdrawn. together with its seating and both may be readily
examined and repaired.
The valve is sometimes provided with a projection on its further side to act either
as an additional guide, or as a stop to limit the rise of the valve off its seat, or as
both, and a suitable projection is provided in the valve body or casing to receive or
meet the projection on the valve.
In the case of back pressure valves in which the pipe is attached to the inlet end
by means of two flanges jointed together the valve seating is made separate as
before but is not necessarily screwed to receive a pipe. It is suitably constructed
for attachment to the valve body as in the first mentioned arrangement, but in case
it projects outwardly beyond the surface of the jointing flange on the body part,
the loose flange, which also receives the inlet pipe, is recessed so as to inclose and
cover the projection.
Referring to the drawings,
Figure represents a section of one arrangement of back pressure valve according
to my invention.
The body part or casting 1 is screwed at one end to receive a pipe and at the
other end to receive the portion 2. The inner end of portion 2 forms the guide and
seating for the valve 3 and the outer end is screwed to receive the water coming
into the valve. By unscrewing the portion 2 the valve and seating are both taken
out together, and so may be readily repaired. A stop 4 may be cast in the body
piece 1 and by suitably limiting the distance between this and the end of the sliding
valve, the valve will be caused to close by the return flow of water, no matter
in what position it is fixed, which is not the case with ordinary valves.
In Figure 2 is a combined stop and back pressure valve. The arrangement of
the valve 3 and seating 2 as described in Figure 1 being combined in a body part 1
containing a stop valve 5. By closing the stop valve 5 the valve and seating may
be withdrawn for repair while the pipe on the upper side of the valve is under
pressure. The seating of the stop valve is figured 7 and when it is desired to
remove the valve 3 and seating 2 while under pressure the stop valve 5 is screwed
down and closed by means of the handle 8. The outer end of portion 2 is screwed
externally to receive a nut and tail pipe.
In Figure 3 is another arrangement of stop and back pressure valve the general
principle being similar to the valve illustrated by Figure 2, the corresponding parts
being similarly figured. In this arrangement the body part 1 is provided on its
inlet side with an ordinary joint flange 9 to which the inlet pipe is attached by
means of the special flange 10. The valve seating and guide 2 is screwed into the
body part 1, but is not as in the other arrangements attached direct to the pipe.
It projects below the flange 9 and is provided with a hexagon to enable it to be
unscrewed. Flange 10 is cupped as shown to receive this hexagon, and on removing
flange 10 the valve seating 2 together with the valve 3 may be removed.
The arrangement illustrated by Figure 1 may be used in combination with a stop
valve as described, and the arrangements illustrated by Figures 2 and
made and used without stop valves if so desired.
may be
Having now particularly described and ascertained the nature of my invention,
I declare that what I claim is :-
1. The arrangement and construction of the portion 2 of the back pressure valve
illustrated by Figures 1 and 2, comprising valve seating, guide and connection to
inlet pipe arranged to be withdrawn together with the clack or valve as described.
2. In a back pressure valve of the kind described with reference to Figure 1, the
stop 4, as and for the purpose described and in combination with the withdrawable
seating 2 and valve 3.

page_text: 3. The combination with a stop valve of any of the kinds of withdrawable valves
and seatings described herein.
4. The arrangement of a recessed flange to receive the protruding portion of the
withdrawable seating as shown and described with reference to Figure 3.
Dated this Twenty-fourth day of December 1890.
ROBERT G. BROOKE.