Improvements in and connected with Valves for Controlling the Admission of Steam to Steam-heated Evaporators, or to other Apparatus in which a Predetermined Pressure must not be Exceeded.
Year: 1890

page_text: Date of Application, 22nd May, 1890
Complete Specification Left, 18th Feb., 1891-Accepted, 21st Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in and connected with Valves for Controlling the
Admission of Steam to Steam-heated Evaporators, or to other
Apparatus in which a Predetermined Pressure must not be
Exceeded.
We, JAMES WEIR and GEORGE WEIR, of Holm Foundry, Cathcart, in the
County of Renfrew, North Britain, Engineers, do hereby declare the nature of
this invention to be as follows, that is to say :-
Our said invention has for its object an improved construction or combination of
valve details for controlling the admission of steam to apparatus of various kinds,
when the pressure in the boiler supplying the steam is or may be of higher pressure
than that to be allowed within the said apparatus. Very many attempts have been
made to attain what is required by means of what are known as "pressure-
reducing" valves, but such valves have been found unsatisfactory and unreliable in
working. In such "pressure-reducing" valves a completely automatic action has
been sought, whereas our improved apparatus may be distinguished as semi-
automatic.
In carrying out our invention we provide for the admission of the steam a double-
beat or other suitable equilibrium or approximately-equilibrium valve, arranged to
close with an upward movement, the steam passing from the outside into the
interior and thence to the evaporator or other apparatus. This admission valve
can be closed or turned on its seats by means of a screw spindle entered up through
a stuffing box below, but is free to move up and down when the spindle is not in
the closing position. The top of the admission valve is made or fitted with a disk
which works quite loosely in a cylindrical part of a chamber formed in the valve
box above the admission valve; and to the top of this chamber there is fitted an
escape valve which may be like an ordinary safety valve. The escape valve is
loaded by means of a spring to correspond with the maximum pressure to be
admitted to the evaporator or other apparatus. In the event of the pressure within
the admission valve rising beyond the limit, steam leaks past the edge of the disk,
and acting in the chamber lifts the escape valve and escapes; and when the
attending engineer notices the escape of steam, he can by the bottom spindle adjust
the admission valve by closing it just sufficiently to stop the escape. Until this
adjustment is made the action of the steam on the disk of the admission valve will
close it sufficiently to prevent the pressure within from getting too high.
Dated this Twenty-first day of May 1890.
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in and connected with Valves for Controlling the
Admission of Steam to Steam-heated Evaporators, or to other
Apparatus in which a Predetermined Pressure must not be
Exceeded.
We, JAMES WEIR and GEORGE WEIR, of Holm Foundry, Cathcart, in the
County of Renfrew, North Britain, 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, that is to say :-
Our said invention has for its object an improved construction or combination of
valve details for controlling the admission of steam to apparatus of various kinds,
Price 621

page_text: C
when the pressure in the boiler supplying the steam is or may be of higher pressure
than that to be allowed within the said apparatus. Very many attempts have been
made to attain what is required, by means of what are known as pressure-
reducing" valves, but such valves have been found unsatisfactory and unreliable
in working. In such pressure-reducing" valves a completely automatic action
has been sought whereas our improved apparatus may be distinguished as semi-
automatic.
In carrying out our invention, according to a simple modification shown in
vertical section on an accompanying sheet of explanatory drawings, we provide for
the admission of the steam a double-beat valve, A, (or it might be any other
suitable equilibrium or approximately equilibrium valve) arranged to close, with an
upward movement, against seats, B1, B2, formed for it in a piece fixed in the
valve box, C. The steam passes from the inlet, D, round the outside of the
valve, A, and its seats, B 1, B 2, and through ports between those seats, pro-
ceeding thence when the valve is open to the evaporator or other apparatus by
the outlet, E. This admission valve, A, can be closed or turned on its seats, B1, B2,
by means of a screwed spindle, F, formed with wings, G, on its upper end, the
spindle extending down through a stuffing box, H, below, but the valve A is free
to move up and down when the spindle, F, is not in the closing position. The top
of the admission valve, A, is made with a disk, A. 1, which is attached to it by
webs, and which works quite loosely in a cylindrical part of a chamber, I, formed
in the same piece as the valve seats, B 1, B 2; and at the top of this chamber, I,
there is fitted an escape valve, K, which may be like an ordinary safety valve.
The escape valve is loaded by means of a spring, L, held in a casing, M, fixed to
the valve box, C, this spring L, being adjusted to correspond with the maximum
pressure to be admitted to the evaporator or other apparatus. In the event of the
pressure within the admission valve, A, rising beyond the limit, steam leaks past
the edge of the disk, A 1, and acting in the chamber, I, lifts the escape valve, K,
and escapes, and when the attending engineer notices the escape of steam he can by
the bottom spindle, F, adjust the admission valve, A, by closing it just sufficiently
to stop the escape. Until this adjustment is made the action of the steam on the
disk, A 1, of the admission valve, A, will close it sufficiently to prevent the
pressure within from getting too high. The escape valve, K, with its spring, I,
and other parts are shown as described in the Specification of our Patent
No. 4061 of 1890; but may be constructed and arranged in any other suitable
manner.
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. Combining the parts of and connected with valves for controlling the
admission of steam to steam-heated evaporators or to other apparatus in which
a predetermined pressure must not be exceeded, substantially in the improved
manner hereinbefore described and shown in the accompanying drawings.
2. The combination of an equilibrium or approximately equilibrium valve means
for positively adjusting or closing the same a disk attached to the valve and
working in a chamber above the valve box; and an adjustably loaded escape valve
applied at the top of the chamber the parts being arranged and operating sub-
stantially as and for the purposes herein before described.
Dated this Seventeenth day of February 1891
EDMUND HUNT,
Applicants' Agent.