Improvements in Non-concussive Spring Push Valves.
Year: 1895

page_text: Date of Application, 31st May 1895
Complete Specification Left, 24th Feb., 1896-Accepted, 28th Mar., 1896
PROVISIONAL SPECIFICATION.
Improvements in Non-concussive Spring Push Valves.
We, ROBERT LUKE HOWARD, of 92 Whitecross Street, St. Lukes, in the
City of London, Engineer and JAMES RICHARD DAVIES, of 1 Holly Walk,
Luton, Bedfordshire, Brassfounder, do hereby declare the nature of this invention
to be as follows:-
The inlet shank has an enlarged part or jacket which is screwed or bolted to
the body of the casting or made in one therewith. Within the said jacket is a
cylindrical chamber closed towards the inlet shank end by a small valve which
when open relieves the pressure of liquid in the cylinder and allows this to move
freely. This cylinder is provided with a row of small circumferential holes for
admitting the liquid to the main outlet opening. In the cylinder works a piston.
When the piston is depressed against the effort of a spring and against the liquid
pressure so as to come below the small holes the liquid can pass from the narrow
outer space into the cylinder above the piston and to the outlet shank. The
concussion which would arise where the valve is allowed to close suddenly is
prevented by the liquid immediately above the piston being checked in the upper end
of the cylinder. The top of the piston may be continued into a cylindrical stem
working liquid tight in an upper cylindrical part of the body and terminating in a
push button or a joint for a lever, a helical spring being provided which is placed
around a reduced part of the stem and takes its bearing on a shoulder in the
casting, this spring helping to close the valve when the pressure of the hand is
removed.
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COMPLETE SPECIFICATION.
Improvements in Non-concussive Spring Push Valves.
We, ROBERT LUKE HOWARD, of 92 Whitecross Street, St. Lukos, in the
City of London, Engineer, and JAMES RICHARD DAVIES, of Holly Walk,
Luton, Bedfordshire, Brassfounder, 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:-
--
The inlet shank has an enlarged part or jacket which is screwed or bolted to
the body of the casting or made in one therewith. Within the said jacket the body
of the casting has a cylindrical chamber closed towards the inlet shank end; in
this cylinder works a piston provided with a small bottom valve which when opened
by pressing on the push knob connected thereto against the effort of a spring
allows liquid enclosed behind the piston to be relieved and to pass up through the
piston whereupon by continued pressure on the push knob the piston itself is
moved whereby the liquid from the inlet shank can pass from the annular space of
the jacket into the cylinder through small holes in the other or outlet part of the

page_text: same and flow to the outlet but the return or closing action takes place in a gradual
manner by reason of the liquid immediately above the piston being checked in the
outlet end of the cylinder.
Figure 1 on the accompanying drawing is a longitudinal section, and Figure 2 a
vertical section, of a push valve of this kind. The inlet shank A has an enlarged
part or jacket A which is screwed on to the body B; that within the jacket A¹ is
formed with a cylindrical chamber B' closed toward the inlet shank end.
C is a
piston adapted to work in the cylinder B'. The piston has a central through hole
which is closed by a small valve D. The cylinder B' is provided with small holes B²
which are normally covered and closed by the piston Ċ that forms a valve which
normally closes to the outlet F as shewn; the spring E taking its bearing against
a shoulder in the casting is placed around the neck of the push knob G which is
screwed onto the end of the stem D' of the valve D. This stem may suitably be
provided with a cup leather D2 forming a packing to prevent the liquid from squirting
out at this place. Instead of the direct action by pressure on a push knob we may
employ a lever action.
When the push knob G is pressed on against the effort of the spring E, the
valve D is first opened and the pressure of the liquid below the piston C is
relieved and said liquid can escape to the other side of the piston so that the
latter can be moved beyond or clear of the small holes B2; the liquid can then pass
from the narrow outer space between A' and B' into the cylindrical space on the
other side of the piston and to the outlet shank. The concussion which would
arise if the valve were allowed to close suddenly is prevented by the liquid
immediately beyond the outlet side of the piston being checked in this end of the
cylinder. The spring helps to close the valve when the pressure of the hand is
removed.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. A non-concussive push valve having a body formed with a cylinder closed
towards the inlet shank end and arranged within an annular space formed by an
enlargement of the inlet shank, a piston which is adapted to work in the cylinder and
forms a valve towards the outlet and is provided with a through passage and a small
valve which normally closes said passage to the closed end of the cylinder, and small
holes in the other end of said cylinder, all so arranged that when the small valve is
opened the liquid in the closed end of the cylinder is relieved and the piston can
then be moved towards the closed end whereby the small holes become uncovered
and the liquid can escape through them from the annular space to the outlet and when
the small valve is again closed and the piston moves to its seat against the outlet
the liquid immediately beyond the outlet side of the piston is checked in the outlet
end of the cylinder so that no concussion takes place, substantially as set forth.
2. The construction of non-concussive valve as described with reference to the
drawings.
Dated this 24th day of February 1806
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.