Improvements in or relating to Valves.
Year: 1897

page_text: Date of Application, 12th May, 1897
Complete Specification Left, 11th Aug., 1897-Accepted; 11th Sept., 1897
Improvements in or relating to Valves.
We, RICHARD CAMPBELL of 21 Monastery Road Liverpool in the County of
Lancaster, WILLIAM RAILTON of 344 Walton Breck Road, Anfield, Liverpool aforesaid
and SAMUEL GEORGE RAILTON of 11 Melbourne Street, Liverpool aforesaid,
Engineers, do hereby declare the nature of this invention to be as follows:-
This invention relates to equilibrium or balanced valves of that kind in which
steam is admitted on both sides, so as to render them more readily operated by
nearly neutralising the pressure upon the seats, and the object of the invention is to
enable such valves to be more delicately adjusted with accuracy to close both seats
and allow for expansion and contraction of the chest and valves and so prevent
leakage. Valves of this kind are designed to secure a large opening without great
resistance.
In carrying our invention into effect, we form our valves of two discs of the same
or slightly different diameters mounted on a single stem operated by a handle, the
steam (in the case of steam valves) being admitted above and below the upper and
lower discs or valves respectively or between the two. It will be obvious that in this
construction of two seated valves, if the two valves are relatively at a greater distance
apart than the seats owing to unequal expansion or contraction or otherwise, one
valve will completely close on its seat, while the other will not, and so enable steam
to pass by leakage. By our improved arrangement however we entirely avoid this
defect, and insure each valve completely closing on its seat in a steam-tight manner.
To this end we secure one of the discs or valves firmly to one end of the stem; the
other valve we mount loosely thereon, but provide a nut to limit longitudinal move-
ment on the stem. Mounted on the stem between this valve and the other, or a
shoulder on the stem, we provide a spiral spring. This spring absorbs any inaccuracy
in the setting of the valves or inequality in the expansion by heat, because while
normally it tends to keep the two valves at a given distance apart, yet, should the
valves be inaccurately set or should one seat become worn more than the other or one
part expand by heat more than another, then the resiliency of the spring comes into
play and enables both valves to be closed.
The node of action is as follows:-
In closing, the valves are closed by rotating a handle or otherwise, as usual,
whereby each valve is brought towards its seat simultaneously. Should however one
valve close on its seat before the other, owing to inaccurate setting or wear and tear
of the seats or unequal expansion, then by operating the handle, the stem will
forcibly compress the spring and cause the unclosed valve to close on its seat, leaving
the spring in compression, until such time as the valve is again opened. In this
way the spring absorbs any inaccuracy in the valve and prevents leakage.
The above arrangement is the plan we generally prefer when the steam enters
between the two valves.
We have described the above way of carrying the invention into effect, but it
must be understood that we do not restrict ourselves to placing the spring between
the two valves, as it can be equally well arranged beyond one of the valves or other-

page_text: wise, according to the direction of the steam, as for example when the steam enters
above and below the upper and lower valves, instead of between the two.
Dated this 11th day of May 1897.
W. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Patent Agents for the Applicants.
Improvements in or relating to Valves.
We, RICHARD CAMPBELL of 21 Monastery Road, Liverpool in the County of
Lancaster, WILLIAM RAILTON of 344 Walton Breck Road, Anfield, Liverpool aforesaid
and SAMUEL GEORGE RAILTON of 11 Melbourne Street, Liverpool aforesaid, 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 equilibrium or balanced valves of that kind in which steam
is admitted on both sides, so as to render them more readily operated, by nearly
neutralising the pressure upon the seats, and the object of the invention is to enable
such valves to be more delicately adjusted with accuracy to close both seats and allow
for expansion and contraction of the chest and valves, and so prevent leakage.
Valves of this kind are designed to secure a large opening without great resistance.
Referring to the accompanying drawings
Figure 1 is a vertical section and
Figure 2 a plan of a valve constructed according to this invention and
Figures 3 and 4 similar views of a slight modification.
In carrying our invention into effect, we form our valves of two discs A A¹ of the
same or slightly different diameters mounted on a single stem B operated by a
handle, not shown, the steam (in the case of steam valves) being admitted above and
below the upper and lower discs or valves respectively as shown in Figures 3 and 4 or
between the two as shown in Figures 1 and 2. It will be obvious that in this
construction of two seated valves, if the two valves are relatively at a greater distance
apart than the seats owing to unequal expansion or contraction or otherwise, one valve
will completely close on its seat, while the other will not, and so enable steam to pass
by leakage. By our improved arrangement however we entirely avoid this defect,
and insure each valve completely closing on its seat in a steam-tight manner.
this end we secure one of the discs or valves A firmly to one end of the stem B; the
other valve A¹ we mount loosely thereon, but provide a nut C to limit longitudinal
movement on the stem. Mounted on the stem between this valve and the other, or
a shoulder on the stem, we provide a spiral spring D. This spring absorbs any
inaccuracy in the setting of the valves or inequality in the expansion by heat, because
while normally it tends to keep the two valves at a given distance apart, yet, should
the valves be inaccurately set or should one seat become worn more than the other or
one part expand by heat more than another, then the resiliency of the spring comes
into play and enables both valves to be closed.
In the drawings E is the steam inlet and F the outlet.
The mode of action is as follows:-
To
In closing, the valves are closed by rotating a handle or otherwise, as usual,
whereby each valve is brought towards its seat simultaneously. Should however one
valve close on its seat before the other, owing to inaccurate setting, or wear and tear
of the seats, or unequal expansion, then by operating the handle, the stem will

page_text: forcibly compress the spring and force the unclosed valve to close on its seat, leaving
the spring in compression, until such time as the valve is again opened. In this
way the spring absorbs any inaccuracy in the valves and prevents leakage.
The above arrangement is the plan we generally prefer when the steam enters
between the two valves.
We have described the above way of carrying the invention into effect, but it must
be understood that we do not restrict ourselves to placing the spring between the two
valves, as it can be equally well arranged beyond one of the valves or otherwise,
according to the direction of the steam, as for example when the steam enters above
and below the upper and lower valves as shown in Figures 3 and 4 instead of between
the two.
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. An equilibrium or balanced valve having one disc or valve mounted loosely on
the stein or spindle and the other disc or valve fixed firmly on said spindle, and
having a spring arranged to keep the loose disc normally at a given distance from
the fixed disc, suitable means being provided for limiting the longitudinal move-
ment of the loose disc or valve on the stem substantially as and for the purpose
hereinbefore set forth.
2. The general construction and combination of parts taken as a whole forming the
improved equilibrium or balanced valve, substantially as described with reference to
Figures 1 and 2 of the accompanying drawings.
3. The general construction and combination of parts taken as a whole forming the
improved equilibrium or balanced valve substantially as described with reference to
Figures 3 and 4 of the accompanying drawings.
August
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham and London,
Patent Agents.