Year: 1895

page_text: Date of Application, 29th June, 1895-Accepted, 24th Aug., 1895
ascertained in and by the following statement :--
The present invention relates to improvements in the seats and plugs of valves
and has for its object to ensure a tight joint or closure even when the parts have
been imperfectly ground in together.
:―
In the accompanying drawings :-
Fig. 1 is a vertical section of a stop valve.
Fig. 2 shows a modification of the invention.
Fig. 3 is a side elevation of the plug in a third modification and
Fig. 4 is a vertical section through the hollow cone in the arrangement shown in
Fig. 3.
In the valve casing A (Fig. 1.) there is provided the valve seat B which differs
from the usual construction heretofore employed only in that instead of having the
ordinary narrow bearing surface or seat the inside wall thereof is of smooth hollow
conical form throughout its length (i.e. from top to bottom) as shown at a. This
hollow cone is of a form such as to prevent all possibility of jamming of the conical
plug hereinafter described.
Tu place of the ordinary valve plug there is employed a solid conical plug C
which has arranged on its circumference sharp angular grooves c these may be
formed or mounted in any suitable manner and which impart to the conical plug C
at its periphery a sharp toothed contour the edges d of which are advantageously
in a straight line.
This conical plug C is connected in the usual manner with the valve spindle D
and is guided in the hollow cone a when the valve is being closed the edges d
fitting accurately against the smooth inside wall of the hollow cone and thus
effecting a perfectly tight joint.
In the modification shown in Fig. 2 the taper of the hollow a of the valve seat B
is less than that of the conical plug C₁ the result of this being that only those
edges d which are formed by the upper grooves c will fit against the hollow cone
whilst the lower edges d remain inoperative and become operative only when the
upper ones have been worn away or flattened down or worn the seating away.
The modification shown in Figs. 3 and 4 differs from those already described in
that the grooves are cut or formed on the inside wall of the valve seat B¹ whilst
the solid conical plug C is smooth on its circumference i.e. vice versa.
The mode
of operation of this arrangement is practically the same as that previously
described.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manuer the same is to be performed I declare that what I
claim is :-
1. The combination in a valve of a conical plug having circular parallel grooves
around same forming a series of circular parallel projecting edges thereon acting
in conjunction with a seat the inside wall of which is of a smooth conical form
adapted to receive said plug therein substantially in the manner and for the purposes
hereinbefore described.

page_text: 2. In seats and plugs of valves forming sharply cut circular and parallel
grooves c in the conically shaped valve plug C Cand also forming the hollow
or passage a in the valve seat 13 of smooth conical form to correspond with the
conicity of the valve plug the arrangement being such that the edges d (formed by
the grooves c) of the valve plug C C' bear against the aforesaid smooth conical
passage substantially in the manner and for the purposes hereinbefore described and
illustrated in Figs. 1 & 2 of the drawings hereunto annexed.
3. As a modification of the valve claimed in Claim 2 forming grooves in the
valve seat B in combination and acting in conjunction with a smooth conical valve
plug C substantially in the manner and for the purposes herein before described
and illustrated in Figs. 3 & 4 of the drawings hereunto annexed.
4. The improved valve constructed and arranged to act substantially in the
manner and for the purposes herein before set forth.
Dated this 29th day of June 1895.
TONGUE & BIRKBECK,
Southampton Buildings, Chancery Lane, London, W.C.
TONGUE & BIRKBECK,
Southampton Buildings, Chancery Lane, London, W.C.