Improvements in Means for Automatically Cleansing the Filters used in the Filtration of Liquids Delivered under Pressure, also applicable for the purpose of Emptying the Service Pipes of their Contents on the Supply being cut off.
Year: 1899

page_text: Date of Application, S1st Jan., 1899
Complete Specification Left, 7th June, 1899-Accepted, 29th July, 1899
Date of Application, vist val.,
Complete Specification Left, 7th June, 1899-Accepted, 29th July, 1899
PROVISIONAL SPECIFICATION.
Improvements in Means for Automatically Cleansing the Filters used
in the Filtration of Liquids Delivered under Pressure, also
applicable for the purpose of Emptying the Service Pipes of their
Contents on the Supply being cut off.
I, OTTO HOFFMANN, of West View, 18, Wellington Road, Withington, near
Manchester, in the County of Lancaster, Engineer, do hereby declare the nature
of this invention to be as follows;-
My said invention relates to means for automatically cleansing the filters used
to filter liquids delivered under pressure for various purposes such as for humidify-
ing apparatus used for moistening the air in factories and other situations.
Further my invention is equally applicable for use in automatically emptying
the service pipes used for the indicated purposes of their contents when the
pressure is cut off so as to prevent the water in the pipes becoming frozen or for
any other reason.
In carrying my invention into effect I provide a suitable casing or receptacle
preferably disposed near to the force pump employed or the main service pipe as
the case may be. The casing is divided into two chambers one of which is in
connection with the water supply and the other carrying a suitable filter.
Access to the chamber containing the filter is provided for by an opening
governed by a valve opened against the action of a spring.
A waste water outlet is provided to the casing from the chamber containing
the filter which is closed by means of a valve carried on the end of a hollow
spindle or rod which projects within the chamber in connection with the water
supply. This spindle is provided with a piston working within a short cylinder
formed in the chamber. The area of this piston is greater than the area of the
valve on the end of the hollow rod. In addition the chamber in connection with
the supply is provided with a relief aperture which may be governed by a suit-
able valve.
The action of the apparatus is as follows.
Water is forced by the pump or other means into the apparatus, the pressure
first raising the piston within the cylinder. Any air or water contained within
the cylinder is ejected through the hollow piston rod into the waste water pipe.
The head of the piston is thrust fluid tight against a suitable lid or cover upon
the short cylinder and the valve on the end of the rod in this position is brought
against its seating closing the waste water pipe.
The pressure of water increasing the valve to the chamber containing the
filter is thrust off its seat against the action of the spring and the water is forced
through the filter to the service pipes which are suitably connected to the filter
casing and from thence to the point of delivery.
When it is desired to cleanse the filter the water feed is stopped. The
pressure being thus removed the water contained in the chamber is drained away
by the relief aperture and the valve governing the entrance to the filter chamber

page_text: is closed by the spring. The water in the service pipes which pipes are at a
higher level than the apparatus containing the filter, escapes through the waste
water outlet, the pressure forcing the valve off its seat, the piston on the valve
rod being no longer raised by the water pressure. A reverse current of water
thus passes through the filter carrying with it the impurities deposited thereon
to the waste water pipe. The service pipes are also emptied of their contents,
so that if desired the apparatus may be employed without filter, for the purpose
of automatically emptying the service pipes on the water supply to the pipes
being shut off.
The relief aperture provided may be so governed by the valve that the closing
of the delivery valve to the filter and the opening of the valve to the waste water
pipe on the cutting off of the supply may be accelerated or retarded at will.
Dated th 20
1000
Improvements in Means for Automatically Cleansing the Filters used
in the Filtration of Liquids Delivered under Pressure, also
applicable for the purpose of Emptying the Service Pipes of their
Contents on the Supply being cut off.
I, OTTO HOFFMANN, of West View, 18, Wellington Road, Withington, near
Manchester, in the County of Lancaster, 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 and
accompanying drawings:-
:-
My said invention relates to means for automatically cleansing the filters used
to filter liquids delivered under pressure for various purposes such as for humidify-
ing apparatus used for moistening the air in factories and other situations.
Further my invention is equally applicable for use in automatically emptying
the service pipes used for the indicated purposes of their contents when the
pressure is cut off so as to prevent the water in the pipes becoming frozen or for
any other reason.
The accompanying sheet of drawings clearly illustrates my invention.
Fig. 1 is a plan view of my improved valve, showing the valve seating with
the valve removed.
Fig. 2 is a sectional elevation of same.
Fig. 3 is an outside view of the valve at right angles to Fig. 2 and showing
the same in conjunction with a filter.
In carrying my invention into effect I provide a suitable casing or receptacle A
preferably disposed near to the force pump employed or the main service pipe as
the case may be. The casing A is divided into two chambers B C.
The chamber C is in connection with the water supply and the chamber B is
in communication with a suitable filter D carried within a casing E secured to
the valve casing A as shown in Fig. 3.
The filter D may be of any suitable description and is shown in the drawings
as being composed of an outer cylindrical body of fine metallic gauze containing

page_text: within a conical body of gauze thus forming two walls affording a large filtering
surface within a comparatively small area.
Access to the chamber containing the filter D is provided for by an opening a
governed by a valve opened against the action of a spring c. The valve b
slides upon a spindle d screwed to a boss d¹ carried by radial arms e of a screwed
ring fas shown more clearly in Fig. 1.
A waste water outlet F is provided to the casing A from the chamber B leading
to the filter D, which outlet is closed by means of a valve 9 carried on the end of
a hollow spindle or rod h which projects within the chamber C in connection
with the water supply. This spindle h is provided with a piston i working within
a short cylinder formed in the chamber C. The area of this piston i is greater
than the area of the valve g on the end of the hollow rod. In addition the
chamber C in connection with the supply is provided with a relief aperture k
which is governed by a suitable valve k¹.
rj
The action of the apparatus is as follows.
Water is forced by the pump or other means into the apparatus as shown by
the arrow, the pressure entering below the piston i through the passage i¹ and
raising the piston within the cylinder j. Any air or water contained within
the cylinder is ejected through the hollow piston rod into the waste water
pipe F. The head of the piston is thrust fluid tight against a suitable lid or
cover screwed upon the short cylinder and the valve g on the end of the rod h
in this position is brought against its seating closing the waste water pipe F.
The pressure of water increasing, the valve b to the chamber B is thrust off
its seat against the action of the spring c and the water is forced through the
filter 1 to the service pipes which are suitably connected to the filter casing E,
and from thence to the point of delivery.
When it is desired to cleanse the filter D the water feed is stopped. The
pressure being thus removed the water contained in the chamber C is drained
away by the relief aperture k and the valve 6 governing the entrance to the
chamber B is closed by the spring and water pressure above the valve b. The
water in the service pipes, which pipes are at a higher level than the apparatus
containing the filter, escapes by way of a semi-circular passage m as shown by
the arrows y through the waste water outlet F, the pressure forcing the valve g
off its seat, the piston on the valve rod being no longer raised by the water
pressure. A reverse current of water thus passes through the filter D carrying
with it the impurities deposited thereon, to the waste water pipe. The service
pipes are also emptied of their contents, so that if desired the apparatus may be
employed without a filter, for the purpose of automatically emptying the service
pipes on the water supply to the pipes being shut off.
k
The relief aperture provided may be so governed by the valve ¹ that the
closing of the delivery valve 6 to the filter D and the opening of the valve g to
the waste water pipe F on the cutting off of the supply may be accelerated or
retarded at will. As the relief aperture is only used to accelerate the action of
the valve it may if desired be dispensed with.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1) The improved means for automatically cleansing the filters used in the
filtration of liquids delivered under pressure and for automatically emptying the
service pipes of their contents, consisting of a casing containing two chambers
one of which is in connection with the water supply, the other with the filter and
a waste water outlet, and having moveable valves arranged to effect the cleansing
of the filter and the emptying of the pipes on the supply being cut off sub-
stantially as described and shown.
2) The general arrangement construction and combination of parts comprising

page_text: the improved apparatus for automatically cleansing filters and emptying service
pipes substantially as described and illustrated.
תו.י.בד
Cut 1
PT
1000
or the Applicant,
E. K. DUTTON & Co.,
Chartered Patent Agents,
5, John Dalton Street, Manchester.