Improvements in and connected with Automatic and other Valves.
Year: 1891

page_text: Date of Application, 20th Aug., 1891-Accepted, 26th Sept., 1891
COMPLETE DIECIFICATION.
Improvements in and connected with Automatic and other Valves.
I, JOHAN PETER ALFRED LARSON of Helsingborg Sweden, 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:
This invention relates to an arrangement for lessening or preventing shocks
arising when an automatic valve is closed.
Fig. 1 on the drawing shows this arrangement adapted to a cock on a water
conduit and-
Fig. 2 shows my invention applied to the feed valve of a steam boiler.
Figs. 3, 4 and 5 are details in horizontal section.
The cock shown in Fig. 1 is so arranged that the piston A which fits in the
valve-chamber E and is made in one with a hollow plunger B can be raised by a
suitable device such as for instance a lever or an eccentric so that the lower surface
of the piston A is raised above the lower edge of the opening C in the wall of the
valve-chamber E. In this way the water issuing out of the opening C comes in
under the piston A. and out through openings D made in the side of the plunger B.
These openings D are then above the bottom of the valve-chamber E when the
piston A is raised, and the water then flows out through the hollow plunger B.
When the cock has to be shut or in other words when the piston plunger A B is
allowed to go down there will be a counter pressure acting upon the under surface
of the piston owing to the cushion of water under the same thus preventing the
piston from striking violently against the bottom of the valve chamber E while
permitting it to sink down slowly being actuated so to do by the pressure in the
water pipe and partly also by its own weight. It is evident that the water contained
under the piston must escape in proportion as the piston sinks. This is effected by
small holes F (Fig. 3) extending through the piston at its outer edge, through
which the water flows up into the space above the piston. These holes may also
be replaced by channels in the external sides of the piston (see Fig. 5) or in such
a way that the piston does not fit tightly into the valve chamber as shown in Fig. 4.
In the feed valve shown in Fig. 2 the arrangement is so far reversed as compared
with that just described inasmuch as the water, which has to pass through the
valve-chamber E has to go in the opposite direction because it has to be forced into
the boiler through the opening C. The water is first forced into the chamber G
surrounding the hollow plunger B and when the water pressure in the chamber G
exceeds the steam pressure in the boiler the piston plunger A B will naturally be
raised so that the openings D in the plunger will rise above the bottom of the valve
chamber E and the under surface of the piston A above the lower edge of the
opening C in such manner that the water flows into the boiler through the said
opening.
When the pressure in the chamber G ceases or is lower than that in the boiler
the piston A will slowly sink owing to the same reasons as stated in the case first
described.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
First. In an automatic valve the arrangement of parts for lessening or preventing
shocks consisting of a valve chamber provided either with inlet or exit openings a
hollow piston plunger in such chamber which piston plunger has holes channels or
the like at in or near its unner periphery and openings through the side of the

page_text: lower hollow plunger like part, said piston plunger serving either as exit or inlet
for the liquid substantially as described and shown.
Second. The constructions of valves shown on the drawings.
1
JENSEN & SON,
77, Chancery Lane, W.C., Agents for Applicant.