IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR REGULATING THE PRESSURE AND SUPPLY OF FLUIDS AND GASSES
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by William Pollard and James
Edward Carter at the Office of the Commissioners of Patents, with
their Petition, on the 28th October 1874.
WC, WILLIAM POLLARD and JAMES EDWARD CARTER, of Halifax, in
the County of York, Engineers, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR
REGULATING THE PRESSURE AND SUPPLY OF FLUIDS AND GASSES," to be as
follows:-
"
This Invention relates to certain improvements in the method of and
apparatus for regulating the pressure or supply of water, gasses, or any
other fluid, and is applicable to such in all cases where it is desired to
reduce the pressure proportionately from one pipe or vessel to another.
The valve is also so constructed as to act as a stop valve when
required.
Our improvements relate more particularly to water mains in towns,
where the pressure is in the first instance high and varying according to
altitude. The constant bursting of pipes under such circumstances
causes much waste of water, stoppage of supply, and other inconvenience
and expense to the user.

page_text: The object of this Invention is to so regulate the supply in such a
manner as to prevent such inconvenience and expense.
The Invention is also applicable to waterclosets, lavatories, baths, and
ordinary water taps for dwelling-houses, to dye houses, water engines,
reservoirs, and the regulation of the supply of illuminating and other
gasses.
We accomplish our object in the following manner :—To an ordinary
Mathers or any other suitable valve with one scat is cast or attached a
cylinder of larger area proportionately than the valve, in which is fitted
a perfectly gas or water-tight piston with rod passing through cylinder
bottom and valve cover. This rod is attached to the valve. Upon the
cylinder cover or in any other convenient position is placed a three way
cock or tap, the smallest size of which is adequate for the largest sized
mains. This tap communicates with pipes attached to and communi-
cating with both sides of valve. When it is desired to make the
improved apparatus act as a stop valve, open the cock or tap communi-
cating with high pressure. sido of valve, when the fluid or gas will fill
cylinder at top side of piston and close the valve. When it is required
to use the apparatus as a reducing valve, turn the three-way cock or tap
opening connection with low-pressure side of valve, when the pressure
will lift up valve and piston and pass through pipe communicating with
top of piston. When the pressure at low-pressure side rises to the pressure
the valve is constructed for the pressure again will act on the top sido
of piston and close or regulate valve in the manner above described. An
air vessel is placed upon cylinder cover or in any other convenient
position to prevent sudden rush of pressure. When the full pressure is
required to pass through the valve the three-way cock or tap is so
adjusted as to close the pipes communicating with both sides of
valve and open a communication through shell of tap to the atmosphere
to allow the pressure at top side of piston to pass away, when the valve
will open and allow an equal pressure on each side of valve, which is of
great advantage when the utmost pressure is required for fire and other
purposes.