Improvements in Safety Valves.
Year: 1895

page_text: Date of Application, 21st May, 1895
Complete Specification Left, 19th Feb., 1896-Accepted, 21st Mar., 1896
We, JAMES CARTER, and FREDERICK CHARLES CARTER, both of The Atlas
Works, Stalybridge, in the County of Chester, Engineers, do hereby declare the
nature of this invention to be as follows:
:-
This invention relates to safety valves for steam boilers arranged to blow off
both for high steam and low water and is designed to provide a valve of this class
in which all the parts will be easy of access for removal or repair.
We construct the apparatus with two chambers and two valves with a common
opening to the boiler. Each of the valve chambers is fitted with a separate outlet
or exhaust so that it can at once be seen which is blowing off or from which steam
is escaping.
Each valve chamber is fitted with a separate cover so that either can be examined
without disturbing the other and without breaking any joints.
In addition to a top cover the low water valve chamber is provided with a side
cover through which the valve can be reached and the weighted rod raised without
having to enter the boiler and remove the weights. For this purpose we provide a
forked or bifurcated plate or lever which can be inserted one arm extending at
either side of the suspended rod. One end of this plate or lever rests upon a pro-
jection on the side of the valve chamber provided for the purpose and the other on
the edge of the chamber and by means of a screw or other suitable device can be
raised to take up and sustain the weights and thereby relieve the weight upon the
valve which can be unscrewed and removed.
By this arrangement we are enabled to construct a safety valve to the parts of
which access can be had and repairs carried out without removing the apparatus
and without breaking any of the joints of steam pipes or other steam connections.
Dated this 15th day of May 1895.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Safety Valves.
We, JAMES CARTER, and FREDERICK CHARLES CARTER, both of The Atlas
Works, Stalybridge, in the County of Chester, Engineers, 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 safety valves for steam boilers arranged to blow off
both for high steam and low water and is designed to provide valves of this class in
which all parts will be easy of access for removal or repair.
It will be fully described with reference to the accompanying drawings.
Fig. 1. Front elevation with cover E removed.
Fig. 2. Longitudinal section.
הד
ith water valve B removed

page_text: Fig. 5. Plan of forked plate G.
Fig. 6. Elevation of cover e.
The
The apparatus is constructed with a high pressure safety valve A and a low
water safety valve B situated in a casing provided with two valve chambers a b
and a main cavity C communicating with the boiler D common to both.
valve chambers a and b are provided with separate outlet or exhaust branches a¹
and so that it may readily be seen which valve is blowing off or from which
steam is escaping.
Each valve chamber is fitted with a separate cover a 6 so that either valve
can be examined without disturbing the other and without breaking any main
joints.
In addition to the top cover b¹ of the chamber 6 for the low water valve B the
main cavity C is provided with an opening E at one side below the valve B
through which the weighted valve rod F can be raised without having to enter the
boiler and remove the weights. The opening E is closed by a removable plate or
cover e. To raise and sustain the weighted valve rod F when desired to remove
or examine the valve B we provide a forked or bifurcated plate or lever G which
can be inserted through the opening E one arm extending at either side of the
rod F. One end of the plate or lever G rests upon a projection 9 provided for the
purpose on one side of the main cavity C and the other end rests on the edge of
opening E. The outer end is fitted with a screw g or other suitable device by
which it can be raised and so suspend by means of collar f upon the rod F the
weight H and thereby relieve the weight upon the valve which can be unscrewed
and removed.
By this arrangement we are enabled to construct a safety valve to all parts of
which access can be had and the valves of which can be removed for examination
or repairs without the necessity of entering the boiler or lifting the weights H
from the valve rod F and without breaking any of the main joints of steam pipes
or other steam connections.
The
weights H lever K and float L inside the boiler are of the usual
construction.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is.-
1. In a safety valve for steam boilers the combination with the valves A and B
and valve chambers a and b therefor of the separate top covers a¹¹ and 6 a side
opening E and side cover e with or without a forked lever plate G through which
opening the valve rod can be raised and held suspended while the valve is removed
substantially as described and shown.
2. A safety valve constructed with a side opening through which the weighted
valve rod can be raised and suspended to allow of the removal of the valve
substantially as and for the purposes described and shown.
Dated this 18th day of February 1896.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.