Improvements in Safety Valves.
Year: 1892

page_text: Date of Application, 9th May, 1892-Accepted, 13th Aug., 1892
COMPLETE SPECIFICATION.
Improvements in Safety Valves.
I, CHARLES REGINALD WINN, Mechanical Engineer, of the firm of Charles
Winn & Co., St. Thomas' Works, Birmingham, in the County of Warwick,
Manufacturers, do hereby declare the nature of my said invention and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
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My invention has for its object improvements in safety valves and has particular
reference to those known as "Dead Weight Safety Valves" and those known as
Compound High Pressure and Low Water Safety Valves." These valves are
so constructed as to allow the parts to be easily put together and to make the
valves work freely and steadily while the general formation of the parts are so
designed as to give the greatest strength where required with a minimum quantity
of metal.
In order that my invention may be clearly understood and more easily carried
into practical effect I have appended hereunto two double sized sheets of drawings
upon which I have illustrated examples of the said improvements which enable
others to apply them to these and similar conditions.
Figure 1., is a vertical section side elevation of my compound high pressure and
low water safety valve.
Figure 2., is a cross section on 1-2 of the inverted bridge a*.
Figure 3., is a vertical sectional elevation of my "dead weight safety valve."
Figure 4., is a plan of the "dead weight safety valve."
Figure 5., is a cross section of the column on line 3-4.
Figure 6., is a cross section of one of the dome bars on line 5-6.
Figure 7., is a sectional side elevation of the weight W.
Figure 8., is a part plan of the weights P.
The
Sheet 1., of the drawings illustrates my "compound high pressure and low
water safety valve." It will be noticed that the general configuration of the valve
casing A is peculiar. The stout head a forms the root of the dome a' which is
much less in diameter than the casing itself but it is connected thereto by a sub-
stantial hollow a³ which not only adds to the appearance but it forms a suitable
abutment for the inverted bridge a' which will be hereafter referred to.
upper part of the dome is thickened at a to form a suitable base for the fulcrum
jaw C to be screwed into. In this fulcrum jaw the lever E is hung so as to operate
upon the valve rod F. This rod F is secured effectively into jaw D by a screw
thread d¹ & f' and is afterwards locked therein by the lock nut d². The lower
portion of the rod operates upon the back of the larger or annular valve H by its
nose piece and its collar f which prevents the valve stalk from coming out as
the nut h³ screws down nearly upon it thus leaving sufficient freedom while at the
same time it is quite secure.
The centre boss a' of the inverted bridge a³ is arranged at such distance above
the valve H as to form a stop thus preventing the valve from rising too high or
becoming displaced from any cause. This inverted bridge is made of cross-section
as seen at Figure 2 by two or more arms which are cast with the casing The
bridge curves downwards as shewn and forms a stop and guard for the larger or
annular valve. The lower portion of the large valve H is guided in its seating J
by four wings which work loosely in the seat. The seat J is fitted in the
upward projecting ring 61 and rests upon the top thereof. The hole Y is for the
purpose of drawing any water away. It will be seen that the outer valve H is
made in two parts as usual for convenience and so that the inner or low water

page_text: valve K can be mounted upon its seat ³ which is formed as a part of the lower
portion of the outer valve H. The inner valve K hangs upon h³ of H as a ball in a
socket the underside of K being curved for that purpose. The rod L which com-
municates with the pendant weight and float in the boiler is secured to the valve K
by means of a screw thread screwed into a boss k¹ at the underside of the valve K
and is then secured in its position by the split cotter 62. The main weight W for
the outer valve is fastened upon the end of the lever E and the lever is nicely
balanced and adjusted by the supplemental sliding weight w¹. I provide a boss a
under the branch a' with an internal screw thread a to receive a drain pipe or
cock. The usual well known means are provided for lifting the valve K when
the level of the water falls.
The "dead weight safety valve," is represented on Sheet 2 of the drawings and
is constructed with lid m¹ bolted upon the casing M and from which the dome m'
rises in the shape of four arms having the stiffening ribs m³ to support them making
a T-section as seen at Figure 6. The top of the dome is surmounted by a boss m
in which the valve N is mounted. This valve N is secured in its position by a
screw neck n' and a cap nut n³ which is a very simple mode of construction and
enables the parts to be put together easily at its destination. The seating L is
formed to the segment of a ball at 61 and is secured to the pillar K which is formed
with a base to join on to the boiler fitting. The body part of K is formed of the
section shewn by Figure 5 which is taken upon the line 3-4 Figure 3 having four
stiffening ribs k. The advantage of thus forming the pillar is that while increased
strength is obtained it also forms a suitable guide with a minimum of friction for
the weight casing. The weights P are so formed with the hand holes p¹ that they
may be easily lifted out and the upper one is shewn thinner as it represents only
half the pressure of the larger ones.or say 5 lbs.
By this arrangement any alteration of pressure is facilitated.
It will of course be understood that though I have described 2 arms to the
inverted bridge a³ and four wings to the outer valve H and 4 bars to the cover m¹
of the dead weight valve and that a greater or less number would answer the
purpose in a similar manner but I should never have less than two and generally
more than two.
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 :-
1st. The improvements in "compound high pressure and low water safety
valves" herein set forth and illustrated upon the drawings whether used separately
or in combination one with the other or any two or more in such combination.
2nd. In valves such as described by Claim 1 the manner of forming a stop and
guard for the outer valve H by means of the inverted bridge a'.
3rd. In valves such as described by Claim 1 the particular manner of guiding
the valve H in its seat by means of the wings h³.
4th. In such valves as described by Claim 1 the particular mode of fixing the
jaw D to the spindle or rod F.
5th. In valves such as described by Claim 1 the particular form of valve casing
for mounting the supplemental parts thereupon and therein.
6th. The improvements in "dead weight safety valves
" as herein set forth and
illustrated upon the accompanying drawings whether used separately or in com-
bination one with the other or any two or more in such combination.
7th. In valves such as described by Claim the formation of the pillar K as
herein set forth and as shewn.
8th. In valves such as described by Claim 5 the particular mode of constructing
the cover with bars m³ united by the boss.
9th. In valves such as described by Claim 5 the particular mode of mounting
and attaching the valve N to the cover m².

page_text: 10th. In valves such as described by Claim 5 the improved ring weights P so as
to facilitate alterations in the load.
11th. In valves such as described by Claim 1 the various modifications herein
set forth of limiting the rise of valve H.
Dated this 7th day of May 1892.
GEORGE BARKER,
77, Colmore Row, Birmingham, Agent.