Improved Construction of Water Pressure Pump.
Year: 1892

page_text: Date of Application, 3rd May, 1892-Accepted, 4th June, 1892
COMPLETE SPECIFICATION.
Improved Construction of Water Pressure Pump.
I, HENRY DAVEY, of 3 Princes Street, Westminster, in the County of Middlesex,
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 :-
This invention relates to an improved construction and combination of water
pressure engines and pumps by means of which combination a nearly steady flow
of water is kept up in the supply and delivery pipes. The combination consisting
of two complete engines capable of working together as one machine or of working
separately as two distinct and separate machines.
Fig. 6 a section of one of the pump valve boxes.
A and A' in Fig. 1 are pump cylinders. B and B¹ are pump plungers forming
power cylinders and which are connected together by the rods C¹ C¹. D and D'are
the supply and exhaust pipes which act as rams and which convey the power
water to and from the power cylinders B and B' and upon which the power
cylinders slide.
E is the suction pipe and E¹ the delivery pipe. On the forward stroke of the
engine the water passes into the pipe E past the valve F, Fig. 6, through the
opening T into the pump cylinder A, and on the return stroke the water is forced
back through the opening T past the delivery valve F¹ in Fig. 6, into the delivery
pipe E', on which is placed an air vessel x.
G is a small D slide valve, of which a section is shown in Fig. 5, and which
receives its motion from the engine through the lever H, shaft H', lever I, rod I',
and lever K, and which controlls the passages L and L' in Fig. 5, leading to the
underside of the pistons M and M' in Fig. 4 through the pipes L" and Lin
Fig. 2, n being the exhaust pipe from the same and o the supply inlet to the
valve G.
The inlet valves N and N' in Fig. 4, are valves closing on the bottom edge of
the hollow valves P and P. The pistons M and M' in Fig. 4 are made larger in
area than the hollow valves P and P and the pressure therefore on the underside
of the pistons M and M' tending to lift the valves is that acting on a surface equal
to the difference in area of the two valves. Power water being admitted through
the pipe o and passage L by the movement of the subsidiary valve G, Fig. 5,
to the underside of the piston M, Fig. 4, raises the piston M which carries with
it the hollow valve P and thus places the power cylinder B₁ into communication
with the exhaust pipe R through the pipe D'. At the time water is being
admitted by the valve G to raise the piston M, the water from underneath the
piston M is being exhausted through the pipe n. The power water in the pipe S
forces down the hollow valve P' on to its seating, and passes through the hollow
portion past the valve N' and into the power cylinder B through the pipe D.
Thus one cylinder is being supplied whilst the other is exhausting, the pipes D
and D' acting alternately as supply and exhaust pipes.
The water in the pump cylinders A and A' is cushioned towards the end of the
stroke. The plunger as it advances gradually closes the outlets T and T' thus
throttling the water remaining in the cylinder and which retarding the motion of
the plunger gradually brings it to rest against the indiarubber buffers U and U¹.

page_text: The engines may be made to work together or separately. If required to work
together the lever V of engine No. 1 which actuates the subsidiary valve G of
engine No. 2 through the shaft H¹ lever I, rod I', and lever K receives its motion
from the rod C¹ of engine No. 1, whilst the lever h of engine No. 2 which actuates
the subsidiary valve G¹ of engine No. 1 through the shaft ', lever i, rod i, and
lever k, receives its motion from the rod C of engine No. 2. Thus engine No. 1
works the subsidiary valve of engine No. 2 and nice versu.
If required to work separately, the lever H, which actuates the subsidiary valve
of engine No. 2, receives its motion from the rod C of engine No. 2, and the
lever which actuates the subsidiary valve of engine No. 1 receives its motion from the
rod C of engine No. 1, the levers Y and simply working loose on the shafts H'
and respectively. Thus each engine works its own subsidiary valve.
The engines may also be made to work together by taking the pipes from the
passages Land L leading from the subsidiary valve G of engine No. 2 to the
underside of the pistons M and M' of the power valve box of engine No. 1 and
vice versa, and having an arrangement of cocks so that each engine may be also made
to work its own power valves.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is :-
1st. The combination of the valve box in Fig. 4, with the power cylinders B
and B', the subsidiary valve, Fig. 5, the pump pipes or rams D and D', the
pump cylinders A and A', the pump valve boxes, Fig. 6, the connecting rods C¹
and C, the lever h, the rocking shaft, the lever i, the rod, the lever k, and
the crossheads W and W' or other moving part of the engine giving the required
motion in the peculiar manner shown on the drawing.
2nd. The combination of the power cylinders B and B with the pump
cylinders A and A', so that the water leaving the pump is throttled towards the
end of the stroke to stop the power plungers or pistons in the manner described and
illustrated.
3rd. The combination of two engines causing one engine by means of suitable
levers or connections to actuate the subsidiary valve of the other engine and
vice versa, or by means of suitable pipe arrangements to actuate the main valves of
one engine froin the subsidiary valve of the other engine and vice versa.
Dated this 3rd day of May 1892.
HENRY DAVEY.