IMPROVEMENTS IN EQUILIBRIUM VALVES
Year: 1876

page_text: LETTERS PATENT to Berthold Krocker, of Breslau, Prussia, for the Invention of
"
IMPROVEMENTS IN EQUILIBRIUM VALVES."
PROVISIONAL SPECIFICATION left by the said Berthold Krocker at tho.
Office of the Cominissioners of Patents on the 12th February 1876.
BERTHOLD KROCKER, of Breslau, Prussia. " IMPROVEMENTS IN EQUILIBRIUM
VALVES."
The object of this Invention is so to construct or arrange suction and delivery
valves as to take off the pressure with which their edges are held against their
seats. This pressure of the water is great by a considerable delivery height and
for large diameters, and the valves require great power to lift automatically a power.
amounting to from 15 to 25 per cent. of the total moving power.
The delivery valve is fastened to an iron spindle or stem which passes through a
stuffing box in the valve chest cover, and above the same passes through a double
lever, the fulcrum of which is in a joint bracket screwed into or fastened to the
cover. The other outer end of the lever is by a jointed rod connected to the suction
valve. The latter valve is formed with a cylinder; through which a differential
piston works; the latter is fastened to the suction valve stem connected to the
lever, as described. The proportion of the two arms of the lever is as one to two,
and the drawing force of the piston is thus doubled.
The mode of action is as follows:-Supposing the pump is at that point of its.
movement where it tries to open the delivery valve, the pressure then simulta-
neously acts on the under side of the delivery valve and on the top of the suction
valve piston, the diameter of which latter is so arranged as to take away the
pressure of the delivery water column on the ring surface, which results from the
difference between the waterway of the delivery valve and its upper seat surface.
The differential piston will hence be pressed on to its seat, whereby it draws down
the long arm of the double lever, and with double force lifts the delivery valve
from its seat; its stem however is only loosely surrounded by the lever, and the
water pressure below will raise it to the full extent of its lift against a stop. A
weight on the delivery valve stem serves for bringing it down quickly when the
pump piston begins to draw. When that point has come in the movement of the
pump then the delivery valve seats itself, and assisted by the drawing action of the
Price G1

page_text: pump piston draws the differential piston upwards; the lever is for facilitating this
provided with a balance weight. In the same ratio as the leather or other joint
surface of the delivery valve is pressed hard against its seat so the suction valve is
loosened from its seat to double the extent, or raised, and the passage for the water
opened. When the suction valve closes the differential piston remains in its highest
position, the first described action récommences, and so on.
For smaller pumps for feed and other purposes the double lever alone, without the
differential piston, may be applied; in that case the two arms of the double lever
are of equal length, and the connection with the suction valve is direct. The con-
struction is in other respects similar.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Berthold Krocker in the Great Seal Patent Office on the 11th August
1876.
BERTHOLD KROCKER, of Breslau, Prussia. "IMPROVEMENTS IN EQUILIBRIUM
VALVES."
The object of this Invention is so to construct or arrange suction and delivery
valves as to take off the pressure with which their edges are held against their
seats. This pressure of the water is great by a considerable delivery height and for
large diameters, and the valves require great power to lift automatically, a power
amounting to from 15 to 25 per cent. of the total moving power.
Figure 1 of the accompanying Drawings is a vertical section at A, B, Fig. 2,
through valves constructed according to this Invention; Figure 2 is a plan of same;
and Figure 3 a vertical cross section of same at line C, D, Fig. 2.
The delivery valve A is fastened to an iron spindle or stem b, which passes
through a stuffing box in the valve chest cover c, and above the same passes through
a double lever B, the fulcrum of which is in a joint bracket à screwed into or
fastened to the cover. The other outer end of the lever B is by a jointed rod i con-
nected to the suction valve C. The latter valve is formed with a cylinder, through
which a differential piston x works; the latter is fastened to the suction valve
stem connected to the lever B, as described. The proportion of the two arms of
the lever is as one to two, and the drawing force of the piston x is thus
doubled.
The mode of action is as follows:-Supposing the pump is at that point of its
movement where it tries to open the delivery valve, the pressure then simultaneously
acts on the under side of the delivery valve and on the top of the suction valve
piston x,
the diameter of which latter is so arranged as to take away the pressure of
the delivery water column on the ring surface, which results from the difference
between the waterway of the delivery valve and its upper seat surface. The
differential piston x will hence be pressed on to its seat, whereby it draws down the
long arm of the double lever B, and with double force lifts the delivery valve from
its seat; its stem however is only loosely surrounded by the lever B, and the water
pressure below will raise it to the full extent of its lift against a stop 8. A weight
on the delivery valve stem 6 serves for bringing it down quickly when the pump
piston begins to draw. When that point has come in the movement of the pump
then the delivery valve A seats itself, and assisted by the drawing action of the
pump piston draws the differential piston upwards; the lever B is, for facilitating
this, provided with a balance weight G. In the same ratio as the leather or other
joint surface of the delivery valve A is pressed hard against its seat so the suction
valve C is locsened from its seat to double the extent, or raised, and the passage for
the water opened. When the suction valve C closes the differential piston remains
in its highest position, the first described action recommences, and so on.
For smaller pumps for feed and other purposes the double lever B alone, without
the differential piston, may be applied; in that case the two arms of the double

page_text: lever B are of equal length, and the connection with the suction valve C is direct.
The construction is in other respects similar.
And having thus described the nature of this Invention I declare that I claim,
the double-armed lever connecting the suction valve with the delivery valve, in
combination or not with a differential piston in the suction valve, all operating
substantially as set forth.
In witness whereof, I, the said Berthold Krocker, have hereunto set my hand
and seal, this Twenty-fifth day of July, in the year of our Lord One
thousand eight hundred and seventy-six.
BERTHOLD KROCKER. (L.S.)