Improvements in Reducing and Regulating Valves for Steam and other Pressures.
Year: 1894

page_text: Date of Application, 2nd June, 1891-Accepted, 14th July, 1894
COMPLETE SPECIFICATION.
Improvements in Reducing and Regulating Valves for Steam and
other Pressures.
WILLIAM BOAZ 29 West India Dock Road Limehouse in the County of
London 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 like pressure reducing and
regulating valves, and its object is to construct a reducing and regulating valve in
which the sensitiveness of action is greatly increased, while the wear upon the
valve is practically overcome.
My invention consists in an arrangement of an expansion chamber or chambers,
made of brass, copper, Muntz's metal, phosphor bronze or other suitable metal or
material, in such a manner that the steam pressure in the expansion chamber or
chambers, opens or closes a valve as required, through which valve the high
pressure steam passes to the low pressure side.
And in order that my invention may be readily understood I proceed to describe
the same fully with reference to the accompanying drawings in which :-
Figure 1 is an elevation of my improved steam or other pressure reducing and
regulating valve.
Figure 2 is a plan of same.
Figure 3 is a view of the surface upon which the slide valve moves.
Figure 4 is a section of my invention from line A. B. through line C. D.
Figure 2.
A is an expansion chamber or set of chambers constructed of one, two or more
sets of twin plates, made of brass, copper, Muntz's metal, phosphor bronze or other
suitable metal or material, these twin plates being suitably joined together so as to
form a perfect steam or pressure tight chamber.
To the top end of the said chamber is internally jointed or fixed a spindle or
connecting rod B, at a short distance from the bottom end of the rod B is fixed a
pin or tappet C. this said pin or tappet passes through a slot d in the face or
surface D (upon which the slide valve E moves) into a suitable hole in the slide
valve E.
The steam of high pressure is admitted through the inlet F and passes direct
through the open steam passages or spaces g¹ and g³ into the outlet or low pressure
side. Immediately the steam pressure in the low pressure side exceeds the pressure
the expansion chamber A is set or adjusted for, it acts upon or stretches the said
expansion chamber; the rod B being fixed internally to the top end of the
expansion chamber A at the one end, and the slide valve E (by means of the pin
or tappet C) at the other, the steam or pressure passages gl and g² are thus partly
or wholly closed to the high pressure side by the slide valve E, thus regulating the
exact amount of steam passing from the high pressure or inlet side into the low
pressure or outlet side, to maintain the pressure the expansion chamber is set or
adjusted for.
I regulate the tension of the expansion chamber A by means of the springs G. G.
which fit loosely on the studs or pillars H. H. these springs G. G. being regulated
by means of nuts.
When the steam on the high pressure or inlet side falls below or on a level with
that which the expansion chamber A is set for, the action of the springs G. G. and
the reaction of the expansion chamber keep the steam passages 9 and g² full open,
thus allowing the steam a free passage through from inlet to outlet.

page_text: 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 :-
1. In reducing and regulating valves for. steam and other pressures, the com-
bination of an expansion chamber such as A for opening and closing a valve for
the purpose of reducing and regulating the pressure of steam or other pressures
passing through the valve.
2. The arrangement and combination of a reducing and regulating valve, and for
the purposes hereinbefore described, and as illustrated on the sheet of accompanying
drawings.
WILLIAM BOAZ.