A Regulator for Pumps and Compressors.
Year: 1897

page_text: Date of Application, 29th July, 1897-Accepted, 4th Sept., 1897
COMPLETE SPECIFICATION.
A Regulator for Pumps and Compressors.
I, PETER BROTHERHOOD, of Belvedere Road, Lambeth, in the County of London,
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 :-
My invention relates to an appliance for regulating the working of pumps and
compressors so arranged that, when the fluid that is pumped or compressed attains a
predetermined pressure, the pump or compressor is stopped, and, when the pressure
becomes again reduced, the pump or compressor is started to work.
Fig. 1 of the accompanying drawings is a vertical section and Fig. 2 is a plan
partly sectional on the line 2-2 of Fig. 1 of a regulator according to my invention.
A is a cylinder, fitted with a piston, and having at its end ports al communicating
with a valve box C in which works a differential slide valve consisting of two double
piston valves the upper valve D D¹ a little larger in diameter than the lower
valve E E. The upper piston part. D has two grooves d allowing passage for fluid,
and the lower piston part E has similar grooves e.
The middle chamber of the valve
box C communicates by a pipe and passage F with the discharge of the pump or
compressor or with any pipe, passage or reservoir in connection therewith. The slide
valve is urged down by a spring G adjustable by a screw H. From above and below
the slide valve, ports P and Q open to the outer air, or to a discharge conduit.
The piston rod K is connected to any appliance for stopping the working of the
pump or compressor; it may be to a belt fork when the pump or compressor is
worked by a belt on a pulley, or it may be to an electrical switch when the pump or
compressor is worked by an electro motor, it may be to a shut off valve when the
pump or compressor is worked by a fluid pressure engine, or it may be to a clutch or
the like when the pump or compressor is worked by a mechanical connection.
The apparatus operates as follows:-
When the pressure in the valve box C, acting on the excess of the area D¹ over
that of E¹ overcomes the force of the spring G the slide valve rises to the position
shewn in Fig. 1, the fluid under pressure passing by the port a to the upper end of
the cylinder forces the piston B down, the fluid below the piston escaping by the
port a¹ the grooves e and the outlet Q. The piston being thus forced down, the pump
or compressor is stopped.
When the pressure in C is such that the spring G overcomes the pressure on the
excess of the area of D¹ over that of E', then the slide valve descends until E' is
below the port a¹ whereupon fluid under pressure enters the cylinder and forces the
piston B up, the fluid above it escaping by port a grooves d and outlet P.
The piston being thus forced up, the pump or compressor is again put in action.
Having now particularly described and ascertained the nature of this
invention and in what manner the same to be performed I declare that what
I claim is
A regulator for pumps and compressors comprising a cylinder, a differential double
piston slide valve and an adjustable spring, a passage for liquid under pressure to the

page_text: valve box, and cylinder and outlet ports, a piston fitted in the cylinder and having
its rod connected to the stopping and starting device of the pump or compressor,
substantially as described.
ABEL & IMRAY,
Agents for the Applicant.