January 3, 1913.

THE COLLIERY GUARDIAN.

41

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■' ■' 'A '	1.'

'V i

A W Si-

No. 201
Code Word : Apercibo

SPECIAL FEATURES

“Sentinel” Patent
Stop Valves

Continuously Efficient

No. 203

Code Word : Apercu

1.	Slight Loss of Pressure.—The pas-
sages are practically full area, and the flow
of steam being directed in easy curves
the loss of pressure is negligible.

2.	Strength.—The Chests are of best
Scotch iron, and their carefully rounded
shape gives them great strength. The

SENTINEL WAY.

USUAL WAV

section at flanges is arranged as sketch,
thus avoiding the crystallization and weak-
ness inherent to the usual design.

3. Ample Packing Box.—The covers, too,
are of great strength, and are provided
with specially deep stuffing boxes which
require packing seldom.

4. Fool-Proof Gland.—The gland is of
special design, and

does not bind on the
spindle as is usual if
unevenly tightened.

5.	Repacking under
steam may be effected
after opening the valve
wide (see section).

6.	No Loose Seats.—
The seating ring is of
hard Admiralty bronze.

V.I568.

SPECIAL FEATURES

8. Erosion Prevented.—Chamfering the
seats combined with the

shape of the internal valve
throws the steam clear of
the faces. The projection
on valve throttles steam till
faces are clear.

9. Chattering Elimin-
ated.—The internal valve
receives pressure from the
spindle below the level of

its working

face, and so does not chatter and bruise

v SENTINEL WAY

w

USUAL WAY

itself, which effect rapidly destroys ordinary
valves.

It is screwed into the chest and cannot

loosen.

7. Drained Seating.—We keep the work-
ing face well above condensation level,
and so the valve is tight, hot or cold,
wet or dry.

Catalogue 25S, illustrating and giving
full particulars of these and other
“Sentinel” Valves for Steam and
Water, will be sent on application.
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10.	Water Hammer is avoided by the
cylindrical part of the internal valve
practically fitting inside seating ring. The
first turn of hand-wheel lets but little
steam pass.

11.	Rotating Valve.—Every time it is
opened the internal valve rotates and finds
a new position, thus keeping the faces level.

12.	No Binding.—The spindle is of nickel
steel, having practically the same coefficient
of expansion as the chest, so that valves
shut cold do not bind when hot, as is usual.
The spindle, too, is about three times as
strong as bronze spindles usually fitted,
which we will supply if required without
extra charge.

For satisfaction always use and specify “Sentinel” Valves

ALLEY & MAGLELLAN, LTD

“Sentinel” Works

“Alley, Glasgow”	Polmadie, Glasgow 173 Queen’s Park

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Messrs. Alley & Mac Lei lan, Limited, Polmadie, Glasgow

Please send (Z) a copy of your Catalogue 25 S.

Name_____ ___________________________________________________

Address_______________________________________________________________________

Ref. Gn.	____________________________________