February 6, 1914.

THE COLLIERY GUARDIAN.

321

BRUSSELS EXHIBITION: “GRAND PRIX.

ROUBAIX EXHIBITION, 1911: “GRAND PRIX

HOPKINSON’S

“RDS” Steam Trap

PATENT

SUITABLE FOR ANY PRESSURE,

A large number of these traps have been in use for several years, and our experience has been so satisfactory that we have every
confidence in recommending them to steam users. The workmanship and material are of the highest quality, and is altogether a
far superior article to the many cheap bucket traps now on the market.

SPECIAL

FEATURES.

SIMPLICITY.

RELIABLE.

IN ACTION.

NO DRIBBLING.

STRONG INTERMITTENT
WATER DISCHARGE.

QUICK CUT-OFF.

WILL LIFT ITS WATER
2 ft. FOR EVERY 1 lb.
STEAM PRESSURE.

FITTED WITH VALVE
AND SEAT OF . .

HOPKINSON’S1PLATN AM’
METAL, wRicR is five
times harder than .
bronze and admirably
suitable for with- •
standing the cutting
action of the water.

| SB

■ 3

CAST IRON BODY AND LID,

HOPKINSON’S “PLATNAM” METAL VALVE AND SEAT.

DESCRIPTION.

This steam trap is of the open
float type, and consists in its
simplest form of a Water Cham-
ber A, Float with central guide
B, Valve C, Water Inlet Pipe,
and. Water Discharge Pipe.
The discharge pipe forms the
guide for the float.

The valve remains on its seat
until the float has sunk low
enough to touch the collar on
valve; it then immediately begins
to discharge.

The Gallery or Water Pocket
F is an important feature, as it
fills with water when the Float
is at rest; when the Float begins
to rise from its lowest position,
the water thus collected flows
through the hole G into the body
A, thus ensuring a rapid elevation
of the Float independent of a
small amount of water passing
into the trap. The valve is not
rigidly connected with the
bucket, and it is therefore held
on to its seat until the Float acts
on the Valve. This device is,
therefore, most valuable under
all conditions of working, hut
more especially when the volume
of water entering the trap is
small. Its lifting effect on the
Float is indicated by the sharp-
ness with which the water dis-
charge is cut off.





Write for Catalogue 660, 4th Edition, post free, which illustrates and describes

HOPKINSON’S PATENT SAFETY BOILER MOUNTINGS AND VALVES

For High-pressure Superheated Steam, High-class Exhaust and Water Sluice Valves for Condensing
Plants, &c., Automatic Exhaust Valves, Reducing Valves, Steam Traps, &c., Ac.

Pocket Edition of Catalogue, with Engineers’ Tables, free on application.

J. HOPKINSON & CO. LTD.,

No. 276.

HUDDERSFIELD