Balanced Double-beat Valve and Method of Manufacturing the same.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Balanced Double-beat Valve and Method of Manufacturing the same.
I, HUGO LENTZ, Mechanical Engineer, of 14 Gomperzgasse, Bruenn, in the
Empire of Austria, do hereby declare the nature of this invention to be as
follows:-
My invention relates to a novel balanced double-beat valve. These valves are
used for puppet valve engines and other purposes, and heretofore they have been
very badly balanced for the reason that the lower part of such a valve passes
through the upper seat and is therefore of a smaller diameter than the upper
part of the valve. The difference in diameter and area between the upper and lower
seats, causes an excess of pressure on the larger upper seat, which is very consider-
able considering the high pressure of steam now used. If such a valve is used in
a puppet valve engine, the pressure holding it down must be overcome by the
operating gear, which produces great tensions in the several parts of the same,
and makes an exact regulation of the speed of such an engine very difficult. My
invention overcomes all such difficulties.
In the accompanying drawings illustrating my invention Fig. 1 shows a vertical
section of such a balanced valve with the upper seat detached from the main
seat. Fig. 2 is a plan of Fig. 1. Fig. is a vertical section of the complete
valve and valve casing.
Referring to said drawings the double seat valve A has its lower seat a in the
valve casing C, and the upper seat b in a separate ring B, which is centrally guided
and fastened in said casing C by screws, wedges, or other means. By forming the
upper seat of a separate piece B, I am enabled to make the lower seat a of any
diameter desirable without regard to the upper seat. The lower seat can therefore
be made of the same diameter as the upper seat, or even of a larger diameter, and
in this way an almost perfect balancing of the valve can be obtained.
Such a valve is preferably made in the following manner.
are cast in one piece. The dotted lines B' (Figs. 1 and 2) show ring B in rough
Valve A and ring B
casting. Valve A and ring B are turned at the same time on the lathe, and when
finished the latter is cut off, so that the part B forms a separate ring which can
be pushed up and down on valve A. Ring B with valve A is now fastened upon
casing C by screws or similar means as shown in Fig. 3, and this ring B is
centrally guided in said casing by the shoulder c.
This new balanced valve can however be made in several other ways. Ring B
an be cast with valve A in the same mould, but in such a manner that it hangs
oose on valve A and therefore does not require to be cut off from the latter. Ör
he ring B could be made of two separate semi-circular parts which are fastened
ogether, &c. But for several practical reasons, especially cheapness and accuracy,
prefer the first way of manufacture.
Dated this 23rd day of Vov 1900
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.

page_text: Balanced Double-beat Valve and Method of Manufacturing the same.
I, HUGO LENTZ, Mechanical Engineer, of 14 Gomperzgasse, Bruenn, in the
Empire of. Austria, 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:
Double beat valves as they are generally made are very badly balanced, for
the reason that one end of the valve must be small enough to pass through one
of the seats, so that the seats are necessarily of widely different diameters, thus
causing unequal pressures on the ends of the valve, the greater pressure being on
the larger end of the valve.
Such badly balanced valves when used in puppet valve engines cause unequal
strains, owing to the fact that the pressure holding the valve down must be
overcome by the gear which produces great tensions in the several parts of the
same and makes exact regulation of the speed very difficult.
My invention overcomes all such difficulties and relates to a novel construction
in balanced double seat valve and method of making the same whereby the two
seats of said valve may be relatively proportioned in any desired manner.
In the drawings accompanying my Provisional Specification Fig. 1 shows a
vertical section of such a balanced valve with the upper seat detached from the
main seat. Fig. 2 is a plan of Fig. 1. Fig. 3 is a vertical section of the complete
valve and valve casing.
Referring to said drawings the double seat valve A has one of its faces a seated
in the valve casing C and the other face b, seated in a separate ring B, which is
centrally guided and fastened in said casing C by screws, wedges or other means.
By forming the seat for one face 6 of a separate piece B, I am enabled to make
the seat for the other face of any diameter desirable without regard to the
face b. Face a can therefore be made of the same diameter as face b or even of
a larger diameter and in this way a perfect balancing of the valve can be obtained.
Such a valve is preferably made in the following manner. Valve A and ring B
are cast, forged or otherwise formed in one piece, this ring forming a circum-
ferential flange on the valve as indicated by dot and dash lines B' in Figures 1
and 2.
Said valve A and ring B are then placed in a lathe and turned off to the desired
form and when finished the latter is separated, the opening in the middle of said
ring B being of less diameter than the flaring ends of the valve, so that part B
forms a separate ring which can be pushed up and down on valve A.
Ring B with valve A is now fastened upon casing C by screws or similar
means as shown in Fig. 3, and this ring B is centrally guided in said casing by
the shoulder c.
This new balanced valve can however be made in several other ways. Ring B
can be cast with valve A in the same mould, but in such a manner that it hangs
loose on valve A and therefore does not require to be cut off from the latter. Or
the ring B could be made of two separate semi-circular parts which are fastened
together or other convenient mode may be adopted. But for several reasons,
especially cheapness and accuracy I prefer the first way of manufacture.
"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. A double seat valve comprising a valve having flaring ends and a valve seat

page_text: encircling said valve, the opening in the middle of said seat B being of less
diameter than said flaring ends.
2. A double seat valve, comprising a hollow member having two flaring ends
provided with ground faces and a valve seat adapted to receive one of said ground
faces encircling said hollow member between its ends, substantially as described.
3. The method of making balanced double seat valves, which consists in casting
or otherwise forming a valve provided with flaring ends, and a circumferential
flange between said ends, and subsequently turning said flange to form a seat for
one of said flaring ends and then separating said flange from said valve to permit
same relative movement.
4. A balanced double-seat valve, one of the two seats forming a ring around the
same, said ring being centrally guided and fixed in the main seat.
Dated this 15th day of February 1900.
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.
HARRIS & MILLS,
23, Southampton Buildings, London, W.C., Agents.