IMPROVEMENTS IN VALVE APPARATUS ADAPTED PARTICULARLY FOR USE IN CONTROLLING THE MOTION OF FLUIDS WHEN WORKING UNDER HIGH PRESSURE
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Rookes Evelyn Bell Crompton at
the Office of the Commissioners of Patents on the 22nd November 1878.
ROOKES EVELYN BELL CROMPTON, of the Mansion House Buildings, Queen
Victoria Street, in the City of London, Engineer. "IMPROVEMENTS IN VALVE
APPARATUS ADAPTED PARTICULARLY FOR USE IN CONTROLLING THE MOTION OF
FLUIDS WHEN WORKING UNDER HIGH PRESSURE."
The object of the Invention is to obtain increased facilities in the working of
valves such as sluice valves of large dimensions, and particularly when they are in
use in controlling the operation of fluids under high pressure.
For this purpose the valve plates of each chamber are capable of being separately
acted upon for tightly bearing on the passages closed thereby or of separate removal
therefrom when desired. Either valve plate is capable of being held to its seat
against pressure exerted thereon whilst the other valve plate is released.
When both valve plates have been removed from their seats they are capable of
being removed in their chamber from any interference with the direct passage of
the fluids through such chamber.
In carrying out my improvements each valve plate is formed or provided at the
centre with a screw thread to receive each a screw on cylinder, and these cylinders
are supported to revolve on tubular projections from a central frame or cross head,
which cross head is held in position though capable of movement on stationary
guides formed for it in the valve chamber. The cylinders referred to are also
formed with teeth taken into by screws formed on or applied to separate shafts,
one end of each of which is supported to revolve correctly in the cross head, and
thence these shafts pass out of the valve chamber through suitable stuffing boxes,
and have applied to them pinions and gear by which they may be separately or
together operated from the exterior of the valve chamber.
These shafts also pass through a cross piece which when operated by screw or
other means effects the movement of the internal crosshead to the valve plates
together with those valve plates in the valve chamber, thus leaving a clear fluid
way, or these shafts may be supported in the chamber otherwise than by the cross-
Davies 77

page_text: head, and the movement of the cross-head for the movement of the valve plates to
or from the fluid way may be by another or other shafts.
The valve seats or the surface of the valve plates may be packed with elastic
packing, and the edges of the valve plates in their movement are supported on
courses provided for the purpose in such valve chamber.
The extent of rotary motion of the respective valve plates is controlled by a
central projection or pin to each, having a feather or feathers acting in corresponding
openings to control such partial rotation.
In place of operating the valve plates by screw gear, as stated, the required
movements of such plates to or from their seats may be effected by rack motion
controlled by the separate shafts already referred to.
The valve plates may also be operated by hydraulic means with cylinders, piston,
and plunger.
The passage for the fluid employed may be through the screw or controlling
shafts before referred to or as desired.
Each valve plate may also be operated to move it to or from its seat by more
than one set of movements.
In some cases in place of the valve plates being employed to operate in pairs, a
single valve plate may be operated for its movements to or from the valve seat,
and its removal from and to the fluid-way by means such as referred to.
The details may be varied.