Improvements in High Pressure Valves for Preventing Concussion.
Year: 1896

page_text: Date of Application, 23rd Apr., 1896
Complete Specification Loft 25th lan 1907 Accented
20th Mor
1802
Date of Application, 23rd Apr., 1896
Complete Specification Loft 25th Jan 1907 Accepted, 20th Mar 1807
DIONAL SU BULD
Improvements in High Pressure Valves for Preventing
Concussion.
We, EDWIN JAMES PRESTON, of the Firm of J. Stone & Co., of Deptford, in
the County of Kent, Engineers, and FRANK LLOYD CONWAY, of 85 Englehart
Road, Catford, in the county aforesaid, in the employ of the said firm, do hereby
declare the nature of this invention to be as follows:-
Our invention consists in a self closing valve which is non-concussive when
released even when the pressure of water in the main is considerable.
The valve is provided with a hollow spindle and mounted on this spindle is also
a barrel or hollow cylinder which is made to fit the casing in such manner as to
leave space to form a water cushion. The inner end of the bollow spindle is
open to the service pipe supplying water from the main and is provided with a back
pressure valve and the hollow spindle is near its other end provided with a hole or
holes so as to afford communication between the service pipe and the water cushion.
The barrel is provided with a number of holes near the valve which are normally
more or less closed by being covered by the casing and there is in the said barrel
a hole or a number of holes for the outlet which normally is or are closed by the
casing. When the spindle is pushed in, the space between the outer end of the
casing and the outer end of the barrel is enlarged and is immediately filled.with
water thus forming the water cushion. At the same time the valve which is at the
inner end of the barrel, is pushed off its seat in the casing, water enters the barrel
by the holes round the valve, the other hole or holes in the barrel comes or come
into register with the outlet and allow the water to pass off. There is a spring
which causes the valve to keep normally in the closed position, and as soon as the
spindle is released the valve tends to close by reason of the pressure of the water
on the back of the valve and by the pressure exerted by the spring, but it is
evident that the spring may be dispensed with altogether if desired in cases where
there is a great pressure of water. The water forming the water cushion is
compressed and is prevented from escaping from the hollow spindle by the back
pressure valve in the inner end thereof, thus permitting the valve to close gradually
until the pressure in the valve inlet and that in the water cushion are practically
equal. It is consequently evident that the valve closes slowly and gradually cuts
off the supply of water thus preventing the concussion which usually takes place
in other self closing valves.
L1000
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agente.

page_text: COMPLETE SPECIFICATION.
Improvements in High Pressure Valves for Preventing
Concussion.
We, EDWIN JAMES PRESTON of the Firm of J. Stone & Co. of Deptford in
the County of Kent Engineers and FRANK LLOYD CONWAY of 85 Englehart
Road Catford in the county aforesaid in the employ of the said firm 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:-
Our invention consists in a self closing valve which is nonconcussive when
released even when the pressure of water or other fluid in the main or other source
of supply is considerable.
Fig. 1 of the accompanying sheet of drawings represents in longitudinal sectional
elevation one form of valve constructed according to our invention.
Fig. 2 is a similar view of a modified form.
Fig. 3 is a longitudinal sectional elevation of another form.
Fig. 4 is detail view of yet another form.
Referring to Fig. 1 it will be seen that the valve is provided with a hollow
spindle A to form a chamber B and mounted on this spindle is also a barrel or
hollow cylinder A' which is made to fit the casing A' iu such manner as to form a
water cushion in the chamber C. The front or outer end of the barrel A' is
provided with a cup leather or the liko as shown to prevent leakage and the spindle
is also made liquid-tight by a stuffing box or the like. The inner end of the hollow
spindle A is open to the service pipe supplying water from the main and is provided
with a back pressure valve G, here shown in the form of a ball, which does not
quite properly fit its seating, and the hollow spindle A is near its other end
provided with a hole or holes B' so as to afford communication between the service
pipe and the water cushion chamber C. The barrel A' is provided with a number
of holes D near the main valve A which holes are normally more or less closed by
being covered by the casing A' and there is in the said barrel a hole or a number
of holes E for the outlet F which hole or holes is or are normally closed by the
casing A'. When the spindle A is pushed in the space C between the outer end
of the casing A' and the outer end of the barrel A' is enlarged and is immediately
filled with water passing along the chamber B in the hollow spindle A and into
the eaid chainber C by means of the holes B', thus forming the water cushion.
At the same time the valve A which is at the inner end of the barrel, is pushed
off its seat in the casing A', water enters the barrel A' by the holes D round the
valve, the other hole or holos E in the barrel comes or come into register with the
ontlet Fand the water passes off. There is a spring II which causes the valve A
to keep normally in the closed position, and as soon as the spindle A. is released
the valve tends to close by reason of the pressure of the water on the back of the
valve and by the pressure exerted by the spring, but it is evident that the spring
may be dispensed with altogether it desired in cases where there is a great pressure
of water. The water in forming the water cushion in the chamber C is compressed
and is prevented from escaping from the hollow spindle by the back pressure
valve G which is forced on to its seat in the inner end thereof, thus permitting the
valve Ato close gradually until the pressure in the valve inlet and service pipe
and that in the water cushion C are practically equal. It is consequently evident
that owing to the slight leakage at the back pressure valve G the valve A' closes
slowly and gradually cuts off the supply of water thus preventing the concussion
which usually takes place in other self closing valves.
The valve shown in Figure 2 is provided with a hollow spindle A to form a
chamber B and mounted on this spindle is also a barrel or hollow cylinder A' which

page_text: is made by means of a cup leather or the like to fit the casing A' and in such
manner as to leave a space to form water cushion C. The inner end of the
hollow spindle A is provided with a back pressure valve G and the said hollow
spindle is near its other end provided with a hole or holes B₁ st to afford com-
munication with the water cushion chamber C. The barrel A' is provided with a
hole or a number of holes D near the main valve A which holes are normally
closed by being covered by the casing A and there is in the said barrel A' a hole
or a number of holes E for the outlet F which normally is or are closed by the
casing. When the spindle is pushed in the valve A is pushed off its seat, the
space C between the outer end of the casing A' and the outer end of the barrel A'
is enlarged and is immediately filled with the entering water thus forming the water
cushion. At the same time the valve A is pushed off its seat in the casing, water
also passes through the holes E in the barrel A' which come into register with the
outlet F and allow the water to pass off. As before described there is a spring H
which causes the valve to keep normally in the closed position and when the
spindle A is released the said valve A tends to close by reason of the presence of
the water on the back of this valve and by the pressure exerted by the spring but
it is evident that the spring may be dispensed with altogether if desired in cases
where there is a great pressure of water. The water forming the water cushion in
the chamber C is compressed and is prevented from escaping except very slowly
from the hollow spindle A by the back pressure valve G which is forced on to its
seat in the inner eud thereof, thus permitting the valve A to close gradually until
the pressure in the valve inlet and service pipe and that in the water cushion are
practically equal or the pressure in the water cushion is less than that in the valve
inlet and service pipe. It is consequently evident that the valve A' closes slowly
and gradually cuts off the supply of water as the excess of water from the
chamber C leaks past the back pressure valve G, thus preventing the concussion
which usually takes place in other self-closing valves.
Figure 3 represents part of a valve very similar to that shown in Figure 1 except
that instead of using a ball back pressure valve a flap or pivotted valve G is here
shown.
Figure 4 shows the application of another form of back pressure valve G
provided with a spindle, nuts G and stops G to prevent the nuts from closing the
hole through which the spindle projects when the said valve is off its seat.
It is howevor evident that we do not in any way limit ourselves to the particular
forms of back pressure valves shewn.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1. A self-closing non-concussive valve having a chamber for forming a water
cushion such water cushion being provided with or communicating with a back
pressure valve which comes into action as soon as the valve spindle is released and
allows the main valve to close gradually substantially as set forth.
2. A self-closing non-concussive valve consisting of a casing A having an
outlet Fa main valve A mounted on a barrel A having inlet holes D and an
outlet hole E and kept normally closed by a spring II and having a hollow
spindle A communicating with a chamber C to form a water cushion and provided
with a back pressure valve G substantially as described and shewn.
3. The constructions of self-closing non-concussive valves shown on the
drawings.
1007
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.