An Improved Pressure Reducing Valve.
Year: 1890

page_text: Date of Application, 20th Mar-, 1890
Complete Specification Left, 12th Jan., 1891-Accepted, 20th Mar., 1891
PROVISIONAL SPECIFICATION.
An Improved Pressure Reducing Valve.
We, JOHN SCOTT & JAMES THORNTON, of 43, Queen Square, in the City
& County of Bristol, Mechanical Engineers, do hereby declare the nature of this
invention to be as follows:-
This invention is to construct a valve to reduce pressure to any required amount
& maintain the same with regularity.
A suitable casting of brass or iron having a flange at each end with which to
connect the pipes through which the pressure is required to pass.
A suitable valve loaded with a suitable spring arranged inside the aforesaid
casting, to regulate the pressure.
A suitable spindle projecting through a stuffing box & gland, on the top of
casting, so arranged as to regulate the load on the aforesaid spring.
A suitable non return valve, so arranged that the higher pressure keeps it closed,
but in the absence of this higher pressure, the lower pressure may pass through into
high pressure passage.
Dated this 18th day of March 1890.
JOHN SCOTT.
JAMES THORNTON.
COMPLETE SPECIFICATION
An Improved Pressure Reducing Valve.
We, JOHN SCOTT & JAMES THORNTON, of 43, Queen Square, in the City
& County of Bristol, Mechanical 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:-
The object of this invention is to reduce a high fluid pressure to any required
lower pressure and to maintain the same with certainty & regularity.
A is a valve box or casing of metal with flanged or screwed ends. This valve box
is arranged to have either one or two valve seats as required, viz. B & C.
D is a hollow cylindrical dome connecting to valve box A by means of a flange
or screw, a corresponding flange or screw being on valve box A. On the top of
dome D is a stuffing box E fitted with gland, through which passes the screwed
spindle F.
G is a suitable valve fitted into the top seat B; the high pressure flowing through
the port H lifts the valve G which is loaded by a suitable spring I to the pressure
required in the port J. The compression on spring I is obtained by screwing down
the spindle F.
This spindle being fitted with a suitable wheel or handle on top, (outside of gland).
and passing through a screwed bush which is fixed inside the dome D.
The bottom end of spindle being pointed so as to bear centrally on spring
compressor K.
This compressor K is made with a flange on top so as to cover the end of spring,
also having a hollow shank or guide overlapping the stem of the pivot stand L.
The loose valve M is fitted when required for steam-ships or similar purposes.
The object of this valve M is; (that when no steam is in main boilers) to allow
steam to pass from the winch boiler through port J and valve M into port H,
thence to engine room.

page_text: The lift of valve M is regulated by a stem projecting from bottom of valve G.
The port on the low pressure side is of greater area than that of H, to ensure
a free passage to the expanded steam or fluid.
The wings of valves G and M are made oblique so as to give a slight revolving
movement when working.
The steel spring I being coated with copper or other anti-corrosive substance.
Having thus described 'our invention, we claim`as'new'and desire to secure by
Letters Patent :-
First. The combination of a suitable, spindle, spring, valve, and valve casing, so
arranged as to regulate the flow of steam or other fluids, and to reduce same from
the original pressure to any required lower pressure, substantially as described and
shown.
Second. A return valve enclosed in the lower part of the sanie valve casing,
whereby the steam or fluid may pass through the valve casing from the low
pressure side in the absence of the high pressure steam or Huid substantially as
described & shown.
Third. The wings of the valves constructed obliquely so that on the passing of
the steam or fluid, the valves have a slight revolving motion thereby having a
tendency to keep the valve faces clear & tight substantially as described &
shown.
Dated this Tenth day of January 1891.
JOHN SCOTT.
JAMES THORNTON.