January 17, 1913.

THE COLLIERY GUARDIAN.

145

“SENTINEL” STOP VALVES

THEIR strength of design and material makes them proof against rough or hard
usage, and the stuffing-box gland is so designed that it cannot bind on the spindle,
no matter how carelessly or unevenly it is screwed down.

V.I568.

3

y A' * ? ’	7

V,"'

OVER and above these advantages, the shape of
the internal valve and its method of connection
to the spindle entirely eliminate erosion, chattering
and water-hammer.

THE seat is screwed and not merely forced into
position, and the rotation of the valve, each time

it is opened, keeps the faces level.

THE ample size of the stuffing-box makes re-
packing seldom necessary, and the operation can

be carried out, when required, under a full head
of steam.

WHILE strength and efficiency are always the
points of first importance in “ Sentinel ” Valves,
the large scale on which they are manufactured
makes it possible to sell them at prices competitive
with ordinary valves, to which they are in every
way superior.

ALL these and many other interesting and valuable features of “Sentinel ” Valves
are more fully described and illustrated in List 25 S, sent free to responsible
engineers and others on application.

ALWAYS USE AND SPECIFY "SENTINEL” PATENT VALVES

Alley & MacLellan

Limited

	“Sentinel” Works	
telegrams “Alley, Glasgow”	Polmadie, Glasgow	telephone.  173 Queen’s Park

MESSRS. ALLEY & MACLELLAN, LTD., POLMADIE, GLASGOW
Please send (X) a copy of your list 25 S.

Name________________________________________

Ref. Gn.