SENTINEL MEDIA METERING VALVE
Page 1
1.0 INTRODUCTION
1.1 Scope
1.1.1
This manual covers the installation, operation
maintenance, and replacement parts of the Clemco
Sentinel standard-use and fine-mesh media control
valves. The Sentinel valve is only one part of a blasting
system. The operator must be experienced in the safe
operation of all other equipment used with the valve,
such as the blast machine and remote controls, and with
the hazards associated with abrasive blasting. To
ensure safe blasting, read the manuals for all devices
used in conjunction with the Sentinel valve. Typical
applications are shown in Figures 1 and 2.
1.2 Safety
Alerts
1.2.1
Clemco uses safety alert signal words, based on
ANSI Z535.4-1998, to alert the user of a potentially
hazardous situation that may be encountered while
operating this equipment. ANSI's definitions of the signal
words are as follows:
This is the safety alert symbol. It is used to
alert the user of this equipment of potential
personal injury hazards.
Obey all safety messages that follow this symbol to
avoid possible injury or death.
CAUTION
Caution used without the safety alert symbol
indicates a potentially hazardous situation
which, if not avoided, may result in property
damage.
Caution indicates a potentially hazardous
situation which, if not avoided, may result in
minor or moderate injury.
Warning indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injury.
DANGER
Danger indicates an imminently hazardous
situation which, if not avoided, will result in
death or serious injury.
1.3 General
Description
1.3.1
The Sentinel is a normally-closed,
pneumatically-operated media control valve. The valve
can be joined with a remote control system, as shown in
Figures 1 and 2, to stop the abrasive flow each time the
blast machine is depressurized. It can also be used with
a pressure-hold system, to stop the abrasive flow while
the machine remains under pressure.
If the valve is supplied as part of a Clemco remote
system, it will be controlled with a Clemco Abrasive
Control Switch (ACS) that is mounted on the remote
control handle. This setup enables the operator to shut
off the abrasive flow, allowing air alone to exit the
nozzle, which is used to clear abrasive from the blast
hose, or for blow-down. If the Sentinel valve will not be
used with a Clemco ACS system, an ACS Valve must be
installed on the Sentinel as shown in Figure 2. Use the
ACS instead of the metering handle to shut off the
abrasive flow. The ACS is shown under accessories in
Section 9.2.
1.3.2
Standard-use or Fine-mesh: The Sentinel
comes in two versions.
•
Standard-use: for use with abrasive coarser than 50-
mesh.
•
Fine-mesh: for use with abrasive 50-mesh and finer.
The valves are identical except for the metering plate
and a few related parts. To identify look at the end of the
metering plate shaft. Fine-mesh valves have a U
stamped on the end, the shaft is unmarked on standard
valves. Conversion kits are available to convert from one
to the other. See Section 9.1.
CAUTION
1.3.3
Valves are available with or without an
inspection opening. Valves without inspection openings
are usually used only where height clearance (distance
from the bottom of the machine to the ground) is limited
and requires it. See Figure 3 for nominal dimensions.
WARNING
