Improvements in Safety and other Valves for Steam and other Fluids.
Year: 1893

page_text: Date of Application, 13th May, 1893
Complete Specification Left, 13th Feb., 1894-Accepted, 31st Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in Safety and other Valves for Steam and other
Fluids.
We, JOSEPH DUGDALE, of the Firm of John Dugdale and Sons, of Blackburn,
in the County of Lancaster, Machine Makers, and JOHN FROST DAVIES, in the
employ of the said Firm, Foreman Engineer, do hereby declare the nature of this
invention to be as follows --
Our invention relates to dead weight, lever, spring and other safety valves,
employed on economisers, boilers, boiler pumps etc., and the object of our improve-
ments is to prevent such valves sticking on their seats and to maintain the valves
in a good and efficient working state and this we effect by imparting a slow
rotary or reciprocating motion of the valve on its seating, or it might be a lifting
motion.
In applying our invention to the safety valve of a Green's or other economiser
we secure to the valve spindle a worm wheel which may be conveniently driven
from a small eccentric secured upon the worm shaft employed to give motion to the
scrapers; the eccentric gives a reciprocating motion to a rod connected at one end
to a pivoted arm and the movement of this arm is conveyed by a pawl to a ratchet
wheel mounted on a shaft which carries a worm in gear with the worm wheel on
the valve spindle by which means the valve receives a slow rotary motion on its
seat; or this motion can be attained by any other suitable mechanical means.
In the case of a lever weight valve the weight lever is connected to the
valve spindle by a knuckle or other joint so that the valve and spindle can rotate
freely.
In applying our improvements to safety and other valves of different types for
boilers, boiler pumps and other purposes any convenient mechanism may be employed
to give a rotary or reciprocating motion to the valve on its seating.
By imparting an automatic movement to safety and other valves which are only
in use at irregular intervals of time the valves are both prevented from sticking
and are also maintained in such an efficient state that they will lilt or open to
allow steam etc. to escape at or about the pressure to which they are adjusted; and
again the seats of such valves are not liable to get cut or scored by dirt getting
between the valves and their seats.
Dated this 19th day of May 1803
H. B. BARLOW & GILLETT,
Agents for Applicants.
COMPLETE SPECIFICATION.
Improvements in Safety and other Valves for Steam and other
Fluids.
We, JOSEPH DUGDALE, of the Firm of John Dugdale and Sons, of Blackburn,
in the County of Lancaster, Machine Makers, and JOHN FROST DAVIES, in the
employ of the said Firm, Foreman Engineer, 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 :-
Our invention relates to dead weight, lever, spring and other safety valve,
Efrim Bil

page_text: employed on economisers, boilers, boiler pumps etc., and the object of our improve-
ments is to prevent such valves sticking on their seats and to maintain the valves
in a good and efficient working state, and this we effect by imparting a slow
rotary or reciprocating motion of the valve on its seating, or it might be a lifting
motion.
In applying our invention to the safety valve of a Green's or other economiser
we secure to the valve spindle a worm wheel which may be conveniently driven
from a small eccentric secured upon the worm shaft employed to give motion to the
scrapers; the eccentric gives a reciprocating motion to a rod connected at one end
to a pivoted arm and the movement of this arm is conveyed by a pawl to a ratchet
wheel mounted on a shaft which carries a worm in gear with the worm wheel on
the valve spindle by which means the valve. receives a slow rotary motion on its
seat or this motion can be attained by any other suitable mechanical means.
In the case of a lever weight valve the weight lever is connected to the
valve spindle by a knuckle or other joint so that the valve and spindle can rotate
freely.
In applying our improvements to safety and other valves of different types for
boilers, boiler pumps and other purposes any convenient mechanism may be
employed to give a rotary or reciprocating motion to the valve on its seating.
And in order that our invention may be fully understood and readily carried
into effect we will describe the accompanying sheet of drawings reference being had
to the figures and letters marked thereon.
Fig. 1 is a side elevation, partly in section, of a dead weight safety valve fitted
with our improvements and
Fig. 2 illustrates a convenient arrangement for giving a slow rotary motion to
such a valve.
Fig. 3 is a side view and Fig. 4 a plan, partly in section, of a lever weight safety
valve applied to an economiser, and so arranged according to our improvements
that the valve receives a slow rotary and an intermittent lifting motion.
Fig. 5 is a detail view of part of Fig. 3.
In Figs. 1 and 2,-a represents the casing of the dead weight safety valve, fitted
on a pipe b of a steam boiler or other vessel, the valve c is fitted on a short spindle
carried by a casting d which supports the weights e to hold the valve c on to its
seating at the top of a pipe g; all these parts are of the usual or other con-
venient construction. Above the valve is a casting or frame h which is secured to
the part d and a spindle i which has a bearing in the upper portion of the casing a
is square at its lower end where it enters a square hole in the casting h. To the
spindle i above the casing a is secured a worm wheel j which is in gear with a
worm k keyed on a stud k¹. This stud is caused to turn slowly from a shaft l, see
Fig. 2, on which is fixed an eccentric ', which as the shaft rotates causes a curved
lever m pivoted at m¹ to oscillate and by a connecting rod m³ to give motion to an
arm n mounted on the stud k¹, a pawl n on the arm engages with the teeth of a
ratchet wheel secured upon the stud k' and thus imparts a slow rotary movement
to the stud k¹, worm k, worm wheel and spindle which is transmitted by the
latter to the castings and d and thus to the valve r. The square connection
between the casting and spindle i allows the valve to be lifted by steam pressure
and fall again with perfect freedom; any escape of steam under the valve escapes
through the opening a'.
In Figs. 3, 4 and 5 the casing o of a lever weight safety valve is bolted to a
steam pipe o¹ in communication with the pipes of a Green's or other economiser,
the safety valve (not shown) is carried by a spindle p, made in two parts, connected
together at p'; to the upper part is pivoted a levery fulcrumed at 9' and at the
other end carrying a weight q². A rod r is caused to oscillate say from the worm
shaft of the scrapers by means of a small eccentric in the manner illustrated by
Fig. 2 or in other convenient manner, and this rod is connected to an arm pivoted
on a stud s; a pawl ² carried by the arm r¹ gears into a ratchet wheel t secured to

page_text: the studs on which is a worm s¹ that conveys a slow rotary motion to the worm
wheel p², spindle p and valve.
In order to lift the safety valve intermittently and automatically we secure on
the studs a spur wheel s² which gears into a spur wheel u fixed on a stud u¹ which
is carried in a bearing v on a bracket v¹ secured to the pipe o¹; the stud u' also
carries a worm w which gears into a worm wheel mounted loosely on a stud r¹
supported in the bracket ; keyed on the stud is an eccentric y round which is
fitted a strap the fork of which is pivoted to the lever y. To the stud ¹ is also
keyed an arm to which is secured a weight and a stud bolted to the worm
wheel which rotates in the direction of the arrow, Fig. 3, raises the arm as the
wheel rotates into the position shown in Fig. 5 then the weight falls and
carries the arm 2 rapidly forward thus causing the eccentric y to lift the strap z
and weighted lever 9 by which the safety valve is lifted from its seat for a moment
and rapidly closed as the arm a regains the position shown in Fig. 3.
By imparting an automatic movement to safety and other valves which are in
use at regular or irregular intervals of time the valves are both prevented from
sticking and are also maintained in such an efficient state that they will lift or open
to allow steam etc. to escape at or about the pressure to which they are adjusted ;
and again the seats of such valves are not liable to get cut or scored by dirt getting
between the valves and their seats.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The arrangement use and application of means for automatically rotating a
safety or other valve upon its seating substantially as and for the purposes
described.
2. The arrangement use and application of means for automatically lifting a
safety or other valve from its seating substantially as and for the purposes
described.
3. The arrangement use and application of means for giving a combined rotary
and intermittent lifting motion to a safety or other valve substantially as and for
the purposes described.
Dated this 9th day of February 1894.
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicants.