February 2, 1917.

THE COLLIERY GUARDIAN.

247

Hopkinson-Ferranti
------- PATENT -
STOP VALVE

For Steam and High Pressure Water Service.

The GREATEST ADVANCE
in VALVE CONSTRUCTION
of the TIMES.

Less Weight, Costs Leakage

PRINCIPLE :

Converting the pressure of the
fluid into velocity and re=con=
verting the velocity into pressure,
thereby passing an amount of
steam equal to full carrying
capacity of pipe.

SELLING POINTS:

Passes the same quantity of steam as
a full-bore valve.

Seats half diameter of ordinary sluice
valve, therefore halves possible
leakage.

Graded opening — no sudden rush of
steam in opening.

Is not subject to wedging action or
mechanical strain.

When the valve is open the seats are
protected from the flowing fluid by
the eyepiece.

Always easy to open and close under
pressure.	____________

DISCS AND SEATS OF

HOPKINSON’S

“PLATNAM” METAL.

Suitable for Superheated Steam.

20,000 in use.

Illustrated Specifications and Catalogue free on application.

J. HOPKIHSON 4 CO. H HUDDERSFIELD,

Makers of Patent Valves and Patent Safety Boiler Mountinys,

Imperial House, Kingsway, LONDON, W.C.; 41, Bothwell St., GLASGOW; 2, York Buildings, York
Place, EDINBURGH; Royal Buildings, Park Place, CARDIFF; 7, Manchester Street, OLDHAM;

PARIS and PETROGRAD.

No. 374.