Improvements in Valves suitable for use in connection with Feed Pumps, Feed Heaters, and Boilers or like Apparatus.
Year: 1899

page_text: Date of Application, 28th June, 1899-Accepted, 12th Aug., 1899
COMPLETE SPECIFICATION
Improvements in Valves suitable for use in connection with Feed
Pumps, Feed Heaters, and Boilers or like Apparatus.
We, JOHN BROKENSHIRE FURNEAUX, of Victoria Works, Gateshead-on-Tyne, in
the County of Durham, Engineer, and WILLIAM ARMSTRONG WOODESON, of the
same address, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:-
This invention has reference to a construction of combined check feed and
circulating valves specially adapted for use in connection with a feed pump
or the like, a feed water heater, economiser or like apparatus (hereinafter called
a feed water heater), and a water tube or other boiler and whereby in the event
of stoppage of the feed pump the communication between the inlet of the feed
water heater and the pump will be automatically closed and a communication
between the boiler and the inlet to the said heater automatically opened so that
circulation of water through the heater will still continue and damage thereof
through overheating that might otherwise result be prevented.
Fig. 1 of the accompanying illustrative drawings shows in vertical section
combined check feed and circulating valves constructed according to this inven-
tion. Fig. 2 is a sectional plan of the circulating valve.
The valve casing A is formed with three branches A1, A2, A3 adapted to be
connected respectively to the outlet of a feed pump, to the inlet of a feed water
heater and to the water space of a boiler, for example to the bottom of the steam
drum in a water tube boiler. Within the casing A is fitted a cylindrical liner B
which forms the seating of a compound valve comprising a lower portion C
which acts as a check valve between the feed pump and the feed water heater,
and an upper portion D which acts as a circulating valve, this latter valve which
is fitted to slide in the upper portion of the liner B, being formed with a series
of ports D arranged to register with similar ports B in the liner B when the
two valves are in their lowered positions in which the check valve C closes the
connection between the branches A¹ and A².
In the example shown, the check valve C is a mitre valve arranged to control
a cylindrical passage B2 formed in the lower end of the liner B in which passage
the lower or winged portion C¹ of the valve is guided, the valve seat being at B³.
The circulating valve D is of hollow cylindrical shape cast in one with or
otherwise secured to the check valve C and guided by the upper portion of the
liner B, the valve D and liner B being formed with rows of holes D¹ and B¹
extending at intervals all round the same. Between the liner B and valve case
is an annular space E in connection with the branch A3 and through the lining
at a part thereof opposite the branch A2 is a hole B' for placing the branches A¹
and A2 in communication with each other when the valve C is lifted. The top
of the casing A is closed by a cover F provided with a gland or stuffing box G
through which passes the valve stem H which is furnished with a handle I by
means of which the valve may be raised, turned, or adjusted by hand, when

page_text: desired, the cover F permitting the combined valves to be inserted or withdrawn,
and giving access to the same for examination or repair.
The operation of the combined valves when connected up to a feed pump, a
feed water heater and a boiler is as follows:-When the feed pump is started
the check valve C will be raised so as to open communication between the pump
and feed water heater through the branches A' and A2 of the valve case A, the
circulating valve D being then raised sufficiently to place the ports 1) therein
out of line with the ports B¹ in the liner and so close the communication between
the feed water heater and the boiler through the branch A³. Should however
the pump stop from any cause whilst the feed water heater is in action, the
check valve C will automatically descend onto its seat 133 so as to close the com-
munication between the pump and heater and at the same time move down the
circulating valve D so as to place the feed water heater in connection with the
boiler through the branch A2, ports 1 and B₁ in the circulating valve D and
liner B respectively, and the branch A, so that, assuming the boiler and heater
be in action, water can circulate from the boiler through the valve casing to
the feed water heater and so prevent overheating of the latter.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is: -
1. Combined check feed and circulating valves so mounted within a casing
having three branches adapted for connection respectively to a feed pump or the
like, a feed water heater or the like, and a boiler or the like that when the
valve casing is connected up as mentioned and the pump is started, the combined
valves will be moved to open communication between the pump and heater and
close a communication between the heater and boiler through the valve casing,
and on stoppage of the pump the combined valves will move automatically so
as to close the communication between the heater and pump and open a com-
munication between the heater and boiler through the valve casing, substantially
as described.
2. Combined check feed and circulating valves constructed arranged and
operating substantially as herein before described with reference to and shown
in the drawings annexed for the purpose specified.
Dated this 08th day of Tue 1800