BERMAD 400E-Y, Инструкция по установке, эксплуатации и обслуживанию

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IOM
Model: 43T Pressure Relief Valve
PAGE 7 OF 10
8 Five-Years Inspection and Test
8.1 Complete Weekly and Monthly inspections.
8.2 Place the system out of service (See “Removing the System from Service” above).
8.3 The interior of the Control Valve should be cleaned and inspected.
8.4 The Elastomeric Diaphragm Assembly shall be inspected for wear, and shall be replaced with a new
Diaphragm.
8.5 Place the system back in service. (See instructions "Placing the System in Service").
8.6 The valve and the pilot system must be activated at full flow.
8.7 Take all additional measures as required by NFPA-25 "Standard for the Inspection Testing and
Maintenance of Water-Based Fire Protection Systems."
9 Abnormal Conditions – Troubleshooting
SYMPTOM PROBABLE CAUSE REMEDY
Valve fails to regulate Filter screen (#6, fig.2) blocked. Remove filter cap and screen to
clean. Filter might be insufficient. See
Note below.
Pulsates or hunts. Slowly adjust needle valve (#5,fig.2)
until pulsation stops.
Needle valve (#5, fig.2) not
properly adjusted. Factory set at ½ or 1½ open. Adjust.
Air trapped in main valve cover. Loosen cover tube fitting at the
highest point, allow the air to escape
and re-tighten.
Valve fails to open Insufficient inlet pressure. Check/create inlet pressure.
Pilot is adjusted to high. Turn adjusting screw CCW on pilot (4
in fig.2).
Valve fails to seal inlet
pressure
Filter screen (6 in fig.2) blocked. Remove filter cap and screen to
clean. Filter might be insufficient. See
Note below.
Debris trapped in main valve. Remove and inspect actuator
assembly. Check seat and disc seal.
Check for foreign bodies.
Rinse at high flow-rate.
Diaphragm in main valve is leaking. Open the valve cover, inspect
diaphragm.
If damaged, replace.
Diaphragm in pilot valve is leaking.
Note
-
Large Capacity Filter where the filter screen frequently becomes blocked
:
In cases where the filter screen frequently becomes blocked, it is recommend replacing the standard
filter with BERMAD’s Large Filter Mark “F” (see paragraph 1.2.3).