February 14, 1913.

THE COLLIERY GUARDIAN.

353

“SENTINEL”

PATENT STOP VALVES

V.l 559.

f I "5HE careful designing of these valves at once
■ enhances the appearance and makes them
B considerably stronger than ordinary valves.

The metal flows in easy curves throughout,
avoiding the risk of crystallisation and fracture which
is inseparable from the usual sharp bends.

The internal valve cannot chatter or rock on its seat,
as it receives the pressure of the spindle below its
working face ; while the seating ring is screwed and
not merely forced into position, and therefore cannot
work loose.

The spindle is of large dimensions and is made of
nickel steel, having three times the strength of bronze.
The threads are cleanly cut by automatic machinery,
and the hand-wheel is attached by a key of special
design which cannot work out of the key-way.

The stuffing box is deep and seldom requires re-pack-
ing, which can be carried out, when necessary, under
steam. It is provided with a fool-proof gland, which
cannot bind under any circumstances, however care-
lessly screwed up.

These are only a few of the features (many of them
exclusive) of the “Sentinel” Patent Stop Valves.

They and our other specialities for steam and water
users are more completely described and illustrated
in our Catalogue 25 S, which will be sent to engineers
and others on application.

Always useand specify “SENTINEL” PATENT VALVES

Alley & MacLellan, Ltd

Sentinel Works, Polmadie

Telegrams	I f I C\ Q /V "lAf	Telephone

ALLEY, GLASGOW	V—* X **	¥ ’	W QUEEN’S PARK

Messrs. Alley & MacLellan, Ltd., Polmadie, Glasgow
Please send (X) a copy of your list 25 S.

N ame	________________________________________________________________

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