Year: 1895

page_text: Date of Application, 23rd May, 1895-Accepted, 29th June, 1895
1, ALEXANDER TURNBULL, of the Firm of A. Turnbull & Company, Engineers,
Bishopbriggs, in the County of Lanark, 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 improvements in stop valves for steam and water pipes
or casings of the kind known as Peat's valves or sluice valves and it has for its
object to render the faces fluid tight when closed by applying any desired degree
of pressure, whilst providing for the relief of such pressure or part of it during
the opening and closing of the valve in order to avoid undue wear of the valve
faces and seats.
As illustrated by the accompanying drawings, Figs. 1 and 2 being part vertical
sections of two modifications of the improved valve, the valve A is composed of
the usual valve sluices or sliding face plates B, one covering the inlet C and the
other the outlet D in the valve casing A, the inlet and outlet being in line or
one opposite the other, whilst the plates or sluices B are pressed against the faces
or valve seats E, formed around the inlet C and outlet D, by means of a wedge
block F on the valve spindle G as shewn at Fig. 1. The seats E of the valve
may be fitted in an annular groove e formed in the valve casing in the manner
shewn at the right hand side of Fig. 1 or the annular groove e may be formed
as shewn at the left hand side and contain a metal ring /, as described in the
Specification of my Patent No. 8357/94, against which the valve seat E bears, the
seat being held in position by having its lower end entered into an inclined semi-
circular groove g formed in the casing, and its upper end being secured by having
a collar h placed over it. The block Facts on two or more spherical segments H
which in turn bear on sockets formed on the inner side of each of the plates or
sluices thereby constituting a ball and socket joint which so adapts itself to any
slight in regularities of the block F or sluice plates B that both plates or sluices
are pressed equally against their seats. Between a collar K on a screw O formed
on the wedge block F a helical or other spring L is interposed and which by
exerting pressure on the wedge block presses outwards the valve plates B
against their seats E the degree of pressure being made variable by applying
more or less compression on the spindle L by means of a nut M acting on a
screw formed on the wedge block F or by like means. To obtain access to
the nut M for this purpose a plug N is screwed into the lower end of the casing.
Such pressure is thus applied as will ensure the holding of the valve plates B closely
on their seats E without any intervening space and when the valve is thus closed
further pressure may be applied by turning the screw threaded valve spindle G to
depress the wedge block F in the usual way whilst in opening the valve the
turning of the spindle G first relieves the valve from the pressure of the wedge F
and the spring L acting on it and then draws the sliding valve plates D over
their seats when the pressure is relieved.
In lieu of using the wedge block F the plates or sluices B may be pressed
against the seats E by toggle levers J connected to the spindle G and the valve
plates B as shewn by Fig. 2 in which case the back of the valve faces may either
be flat as shewn or formed with bearing sockets on which segments are fitted to
bear as in the modification shewn at Fig. 1, the toggle levers being in the latter
case connected to the spindle G and the segments H.

page_text: The spring L may be applied at either end of the wedge block or toggle
levers.
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. A stop valve the parts of which are constructed, combined and arranged to
operate substantially as described under different modifications with reference to
the accompanying drawings.
2. In a stop valve of the class set forth the combination with the valve plates
or sluices and a wedge block or toggle acting thereon, of a spring arranged to
apply closing pressure on the valve substantially as described.
3. In a stop valve the combination with the valve plates or sluices and a wedge
block, toggle or other closing device of spherical segments interposed between
them to form a ball and socket joint substantially as described.
Dated this 22nd day of May 1895.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.