Improvements in Steam and other Pressure Valves.
Year: 1892

page_text: Date of Application, 15th Dec., 1892-Accepted, 4th Mar., 1893
COMPLETE SPECIFICATION.
Improvements in Steam and other Pressure Valves.
1, CHARLES RICHARDS, of 51 Forest Lane, Stratford, in the County of Essex,
Marine 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 :-
My invention relates to improvements in steam and other pressure valves, and
has for its object the attainment of an easy lift against pressure, and avoidance
of impact and strains induced thereby when large areas are suddenly opened
under such conditions.
In order that my invention may be clearly understood I have appended the
accompanying sheet of drawings in which
Figure 1 is an elevation of the valve and seat, and Figure 2 a section thereof;.
similar letters of reference being used to indicate corresponding parts throughout.
In carrying my said invention into effect, I employ a spindle a which may be
operated by a screw, lever or other suitable mechanism. Said spindle carries the
main valve e, loosely fitted thereupon, and a sinaller valve similarly fitted, and
seated within a coned or other seat in the valve e. A washer d, preferably coned,.
fits within a seat in the valve band is held in position by a nut c or equivalent
device fitted to the spindle a. Referring to Figure 2, a clearance his shewn on
the spindle a below b, said spindle being suitably shouldered and calibrated..
A similar, but preferably greater clearance is shewn at g, where said spindle
engages with the main valve base, e. When said spindle a is lifted, the nut or
collar c clears the washer d which being lifted from its seat, admits part of the
steam or other gas or fluid under pressure, and a further lift of the spindle a causes.
the shoulder to lift the valve b which practically places the two surfaces of the
main valve e in equilibrium, and when the spindle is then raised so that the
shoulder g lifts said valve e, the force expended in opening the pressure area to its
full extent is much less than would have been the case had said main valve to have
been opened against pressure by a direct movement of the spindle a.
The pressure
on both sides of the main valve are gradually equalised by the two prior admissions
at d and b.
I do not confine myself to any special type of valve, so that the arrangement.
thereof admits of one or more exits of smaller area than the main valve, under
the pressure of the steam fluid or gas to which it is adapted.
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 ;-
First. In a pressure valve the provision of one or more valves or equivalents
of smaller area than the main valve, in combination with a central spindle, so.
that the gradual motion thereof may equalise the pressure substantially as herein
described with reference to the drawings.
Second. In a pressure valve as referred to in the preceding claim, the com-
bination of a spindle with two or more stops or shoulders for operating valves
in sequence, with a main valve having a smaller valve or valves seated therein.
Dated this 10th day of December 1892.
FREDK. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.