Improvements in Pumps with Mechanically Moved Valves.
Year: 1899

page_text: Date of Application, 2nd Aug., 1899
Complete Specification Left, 2nd May, 1900-Accepted, 2nd June, 1900
PROVISIONAL SPECIFICATION.
Improvements in Pumps with Mechanically Moved Valves.
We, ROBERT SAMUEL LLOYD, of the Firm of Hayward, Tyler & Howards, of
Luton, Bedfordshire, and SIDNEY DAVIES, in the employ of the said firm,
Engineers, do hereby declare the nature of this invention to be as follows:-
These improvements in mechanically moved valves are of especial value for
air and gas pumps but are also applicable to water and other pumps. The
plunger is made hollow and open at the rear or inner end near which we provide
a stop lug in the interior of the plunger. We also provide in the latter a
suction valve actuating rod with a shoulder at its forward end said rod being
near its rear end jointed or otherwise connected to one arm of a bell crank
lever the other arm of which serves to depress and close the suction valve and
to limit its rise when opening; the rear end of the said rod is fitted with a
helical spring which has its abutment in a housing formed in the valve casting
or body said spring at its rear end coming against a shoulder on the rear end
of the valve rod and tending to allow the valve to keep open during nearly the
whole of the outstroke of the plunger and free to open at the beginning of the
said stroke; the aforesaid shoulder at the front end of the rod may be fitted
with a helical or other buffer spring and loose collar which in the last part
of the outstroke comes in contact with the stop in the plunger and gently closes
the valve. It will be noted that in this construction no stuffing box is needed
for the valve actuating rod, a screwed plug with joint washer serving to close
the end of the housing containing the helical spring.
The arm of the bell crank lever which comes in contact with the valve may be
positively connected thereto and for this purpose be formed as a fork with slots
that take on to pins on the valve stem so that the valve must follow the move-
ments of the bell crank lever both in the closing and the opening. In that
case the helical spring at the rear end of the valve actuating rod may be
omitted.
The delivery valve may be of the double beat or multiple form.
Improvements in Pumps with Mechanically Moved Valves.
We, ROBERT SAMUEL LLOYD, of the Firm of Hayward, Tyler & Howards, of
Luton, Bedfordshire, and SIDNEY DAVIES, in the employ of the said firm,

page_text: Engineers, 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:-
These improvements in mechanically moved valves are of special value for
air and gas pumps but are also applicable to water and other pumps.
Figure 1 is a vertical longitudinal section through a horizontal pump con-
structed according to our invention. The plunger A is made hollow and open
at the rear or inner end near which we provide a stop lug B in the interior
of the plunger. C is a suction valve and D is the outlet to the delivery valve.
We provide in the plunger A a suction valve actuating rod E with a shoulder F
at its forward end said rod being near its rear end jointed (or otherwise con-
nected) to one arm G of a bellcrank lever the other arm H of which serves to
depress and close the suction valve C and to limit its rise when opening; the
rear end of the said rod E is fitted with a helical spring I which has its abut-
ment in a housing K¹ formed in the valve casting or body K said spring I at
its rear end coming against a shoulder E¹ on the rear end of the valve rod and
tending to allow the valve to keep open during nearly the whole of the out-
stroke of the plunger, and free to open at the beginning of said stroke; the
aforesaid shoulder F at the front end of the rod may be fitted with a helical or
other buffer spring L and loose collar M which in the last part of the outstroke
comes in contact with the stop B in the plunger and gently closes the valve.
It will be noted that in this construction no stuffing box is needed for the
valve actuating rod, a screwed plug N with joint washer O serving to close the
end of the housing K¹ containing the helical spring I.
The arm of the bell crank lever which comes in contact with the valve may
as shown in the vertical longitudinal section Fig. 2 be positively connected
thereto and for this purpose be formed as a fork H¹ with slots that take on to
pins Con the valve stem so that the valve C must follow the movements of
the bell crank lever both in the closing and the opening. In that case the
helical spring I, Fig. 1 at the rear end of the valve actuating rod may be
omitted.
The delivery valve may be of the double beat or multiple form. The inven-
tion is also applicable to pumps working vertically or at an angle.
By means of these improvements efficient working is ensured at high speed.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. In a pump the combination of a double armed lever having its fulcrum
in the pump casting or in the suction valve casing, one arm of said lever serving
to close the suction valve and the other arm being connected to one end of a
rod within the hollow plunger, a yielding collar on the other end of said rod,
and a lug in the plunger all so arranged that the lug at the end of the out-
stroke of the plunger comes against the yielding collar on the rod and the latter
moves the double armed lever so that the suction valve is quickly but softly
closed thereby substantially as set forth.
2. The construction of pump with mechanically moved suction valve as
described with reference to Fig. 1.
3. The construction of pump with mechanically moved suction valve as
described with reference to Fig. 2.
Dated this Second day of May 1900.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.