Improvements in Valves.
Year: 1898

page_text: Date of Application, 16th Apr., 1898-Accepted, 4th June, 1898
Improvements in Valves.
I, CARL WILHELM VOLLMANN, of No. 301, St. James Street, in the City of Montreal,
in the District of Montreal, and Province of Quebec, Dominion of Canada,
Manufacturer, 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 :-
My invention relates to an improved construction of valves which, although
applicable for the control of fluids or gases generally, is particularly applicable for the
control of impure gases or liquids and has for its object to enable the more perfect
closing of a port to be attained and at the same time to remove any foreign substance
that may adhere to the valve seat.
The invention consists, broadly speaking, in adapting a valve to slide across its
seat and be held yieldingly in contact with either a portion or the whole thereof,
until it is in closing position at which time it is forced by unyielding means, into
perfectly tight contact therewith.
More specifically speaking, the valve consists of two parts connected at one end
to a travelling block and adapted to travel with the block in a chamber
intersecting the passage for the gas or fluid, as the case may be. Yielding
resistances, preferably in the form of a pair of coiled springs, bear between said
parts and cause them to bear in a normally yielding manner upon the valve
seats formed by the ends protruding into said chamber of the pipe forming the
said passage. Projecting upwardly from the lower end of the chamber to a point
near the top of the passage, is a wedge-like device with the inclined sides of which
the parts of the valve, which are also wedge-like in form, come in contact as they
are in the act of completing the closure of the passage, and as they are forced further
towards the bottom of the chambers they will be jammed thereby against, said valve
seats, the lower edges of the valve parts being formed with knife edges to scrape
the faces of said valve seats and remove any foreign substance that may adhere
thereto.
The means for actuating the valve consists preferably of a screw held against
longitudinal movement but free to rotate at its lower end in a recess in the upper
end of the wedge-like projection and at its upper end in a cap forming the upper end
of the chamber, the before mentioned travelling block having a screw-threaded
perforation formed through it which is engaged with and travels along the said screw
as this is rotated, which can be done by any suitable means.
For full comprehension, however, of the invention, reference must be had to the
accompanying drawings forming a part of this specification, in which like symbols
indicate corresponding parts, and wherein,
Figure 1 is a longitudinal vertical sectional view of a valve constructed according
to my invention;
and
Figure 2 a transverse vertical sectional view thereof;
Figure 3 a part plan and part sectional view taken on line 3, 3, Figure 1,

page_text: The valve casing is preferably formed with a horizontal passage, 5, having midway
of its length, an enlargement 6 with open top provided with a lateral flange, 7, grooved
as at 8.
A domed cap 9, having its lower open end flanged, as at .10, and provided with
a projection 11, is bolted, as at 12, to the flange 7, its upper end being perforated
and formed with a cup 13 in which takes a gland 14, which is also perforated to
register with the perforation in the dome, the cup 13 and gland 14 constituting a
stuffing box through which the upper end of the valve actuating screw 15 to be
presently described projects.
The enlargement 6 and domed cap 9 constitute the valve chamber into
which the ends of the pipe-like portion of the casing project and form valve
seats, 16, 17.
The bottom or floor of this chamber has a recess 18 in which is located the lower
diminished end, 19, of a wedge like projection, 20, having its upper end recessed, as
at 21, to receive the lower diminished end of the before mentioned screw, 15, which
is formed with a rigid flange or collar, 22, to bear upon the interior of the top of the
dome and retain the screw 15 against longitudinal movement.
The valve proper is composed of two independent cheeks 23 and 24, located in
contact with the respective valve seats 16 and 17. These valve cheeks have their
lower portions formed with tapered recesses 25 to embrace the wedge-like projection 20
while their lower edges are formed with knife edges 26, and their upper adjacent,
parallel faces are recessed, as at 27, to embrace a travelling block, 28, having a screw
threaded perforation, 29, engaging with and travelling along the screw, 15, these
valve cheeks being maintained in yielding contact with the valve seats by means of
coiled springs, 30, having their ends located in recesses formed in the adjacent faces
of the lower parallel portions thereof.
By the rotation of the screw, which may be effected by any suitable means, the
valve cheeks will, through the block 28, be either raised or lowered in the chamber.
While they are in their raised position and gas or fluid is flowing through the
port a quantity of grit or other foreign substance frequently gathers upon the valve
seats; such is particularly the case when impure gases or liquids are controlled.
This is scraped off by the knife edges 26 during the lowering of the valve cheeks,
the springs 30 facilitating such action, while the wedge 20 acts upon the cheeks
as they are completing the closure of the ports and forces them into perfectly tight
contact with their valve seats.
When occasion requires, one of the vaive cheeks can be dispensed with, or
other changes be made in the construction herein before specifically described, without
departing from the nature of my invention.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I
claim is:-
1. The combination with a valve and its seat, of an appliance independent of the
said valve and its seat and so arranged to act upon the same during the completion of
its closing movement and force it into contact with its seat substantially as and for
the purpose set forth.
2. In combination with a sliding valve having its lower edge formed with a knife
edge, and its seat, of means for maintaining said valve always in yielding contact
with its seat and unyielding means independent of said valve and adapted to act
upon same during the completion of its closing movement so as to force the same
into contact with its seat for the purpose set forth.
3. The combination of a valve casing having a chamber extending at right angles
to and intersecting the passage through it, a valve formed in two parts located
respectively adjacent to the ends formed by the intersection of said passage and
a wedge-like projection carried by the floor or bottom of said chamber and
located between said valve parts, substantially as and for the purpose set.
forth.

page_text: .
4. The combination of a valve casing having a chamber extending at right
angles to and intersecting the passage through it, a valve formed in two parts
located respectively adjacent to the ends formed by the intersection of said
passage, a wedge-like projection carried by the floor or bottom of said chamber and
located between the said valve parts, the lower edges of said valve parts being formed
with knife edges, and a yielding resistance adapted to maintain said valve parts
yieldingly in contact with their seats, substantially as and for the purpose set
forth.
5. The combination with a valve casing of a sliding valve having a knife edge and a
spring tending to force the said edge against the valve seat in travelling over same
so as to keep such seat clear of foreign substances, as set forth.
6. The combination of a valve casing having a passage 5, enlargement 6, valve
seats 16 and 17; a domed cap 9; a screw 15; a wedge 20; a block 28 travelling
along said screw; valve cheeks 23 and 24 connected at their upper end to said
block;
and located adjacent to the said valve seats; and coiled springs located
between said valve cheeks all arranged substantially as described and for the purpose
set forth.
ABEL & IMRAY,
Agents for the Applicant.