Improvements in Stop Valves.
Year: 1894

page_text: Date of Application, 23rd Feb., 1894
Complete Specification Left, 23rd Nov., 1894-Accepted, 5th Jan., 1895
Improvements in Stop Valves.
I, ALEXANDER TURNBULL of the Firm of A. Turnbull & Co., Engineers,
Bishopbriggs in the County of Lanark do hereby declare the nature of this
invention to be as follows:-
This invention, which relates to stop valves for steam chests or pipes has for
its object the provision of simple means whereby such valves may be readily
closed tight against high pressures.
To that end I carry the usual screw threaded valve spindle or stem through a
screwed nut or sleeve fitted in a cross head or saddle on the valve casing or cover
the said nut or sleeve being also screw threaded externally to. fit a screwed orifice
in the crosshead and being secured upon a hand wheel or lever.
The screw thread upon the valve spindle is of less or greater pitch than that.
upon the nut or sleeve and whilst the greater part of the movement of the valve
towards or from its seat is or may be effected by turning the screw of greater-
pitch the final seating and the opening of the valve can be effected against the-
highest pressures by turning the screw which gives pressure due to the differential.
pitch.
Dated this 22nd day of February 1894.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents..
Improvements in Stop valves.
I, ALEXANDER TURNBULL, of the Firm of A. Turnbull & Co., Engineers,.
Bishopbriggs, in the County of Lanark, 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, which relates to stop valves for steam chests or pipes has for
its object the provision of simple means whereby such valves may be readily
closed tight against high pressures.
To that end as shewn by the figure of the accompanying drawings I carry the
usual screw threaded valve spindle or stem A through a screwed nut or sleeve B
fitted in a cross head or saddle C on the valve casing or cover D the said nut or
sleeve B being also screw threaded externally to fit a screwed orifice in the
crosshead C and being secured upon a lever or hand wheel E.
The screw thread upon the valve spindle A is as shewn of less pitch than that.
upon the nut or sleeve B, but it may be of greater pitch, and whilst the greater
part of the movement of the valve towards or from its seat is or may be effected
by turning the valve spindle in the ordinary way the final seating and the
opening of the valve can be effected against the highest pressures by turning-
the hand wheel E of the screw B which gives pressure due to the differential.
pitch.

page_text: 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 :-
:-
1. In a stop valve the use of differential screws for applying powerful closing
pressure and for rapidly opening the valve substantially as described.
2. In a stop valve the combination with the screwed valve spindle of a screwed
nut or sleeve arranged and operating to apply additional pressure in closing the
valve on its seat substantially as described.
Dated this day of November 1894.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62, St. Vincent Street, Glasgow, Agent for the Applicant.