Improvements in Iron Cased Dry Gas Meters.
Year: 1892

page_text: Date of Application, 10th Nov., 1892-Accepted, 21st Jan.. 1893
COMPLETE SPECIFICATION.
Improvements in Iron Cased Dry Gas Meters.
I, WILLIAM HENRY COWAN of Buccleuch Street Works, Edinburgh in the
County of Midlothian, North Britain, Gas Meter Manufacturer, 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 improvements in iron cased dry gas meters and has for
its object to render the same less liable to get out of order by preventing the
liability of leakage at the valve plate or valve box.
Iron cased dry gas meters as at present constructed usually have the valve plate
cast as part of the iron case, the valve seats as well as the boxing-in cover for the
valves being fixed upon the said cast iron valve plate by screws and puttied joints.
This method of fixing the valve seats and valves boxing-in cover has been found
defective by leakage occurring through such joints.
In accordance with my invention I construct the valve plate of tin plate and I
fix the valve seats and the valves boxing-in cover thereon in the same way as in the
ordinary tin cased dry gas meters that is to say by soldering.
As an illustration of the manner in which my said invention may be carried into
effect I refer to the accompanying drawings.
Figure 1 is a sectional elevation of an iron cased dry gas meter with its iron front
plate removed.
Figure 2 is a plan of the same with the iron cover removed.
Figure 3 is a sectional side elevation.
A is the valve plate constructed of tin plate upon which the valves are mounted;
the said plate forming the division between the diaphragm chamber B and the
upper part of the meter containing the valves and index gearing. The valves are
not shewn in the drawings as they may be precisely the same as at present used in
ordinary iron cased or tin cased dry gas meters but the drawings shew the valve
box C. The valve plate A may be fixed to the iron casing D in any convenient
manner such as by forming the valve plate A with a flange a which is attached to
the ledge d of the iron casing by the screws d¹ Figure 2.
outside gas inlet pipe; F the under gas tube of the valve plate A, leading the gas
E Figures 1 and 2 is the
to the valves; G the gas outlet from the valves and leading to the outside gas outlet
pipe H.
As shewn in Figures 1 and 2 the outside gas inlet pipe E may be connected to
the under tube F of the valve plate by the brass connection J which is attached to
the side of the valve plate A as shewn more particularly in Fig. 1, is passed
through the outer iron casing D, and the outside inlet pipe E screwed on to
the end of the connection J, the whole being tightened up by the nut j, the
pipe E being further secured in position by a screwed attachment at K Fig. 1.
The outlet pipe H may be attached to the iron casing in a similar manner.
By leaving the space between the side of the valve plate A and the outer iron
casing, as shewn in Figures 1 and 2, the connections can be readily made.
Also by this arrangement the connection J is kept outside the gas or diaphragm
chamber.
I do not limit myself to the use of tin plate in the construction of the valve plate
as I may employ any other metal or material with which solder can be used for the
purpose of my said invention.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
(1) The general arrangement and construction of an iron cased dry gas meter
substantially as and for the purposes herein before described and shewn in the
accompanying drawings.
(2) In iron cased dry gas meters the construction of the valve plate of tin plate
or equivalent material substantially as and for the purposes herein before described
and shewn in the accompanying drawings.
Dated this 8th day of November 1892.
J. Y. JOHNSON,
115, St. Vincent Street, Glasgow, Applicant's Agent.