Problem
Remedy
Steam leakage or
blowing (from
module valve
seat)
Valve chattering
(leakage)
Leakage from a
location other
than module
valve seat (via
discharge, or from
body)
Cause
Back pressure exceeds allowable value
Use within pressure range
Replace disc or module valve seat
Replace disc or module valve seat
Replace or close bypass valve
Use within pressure range
Tighten inner cover or replace
module valve seat
Tighten outer cover or replace
outer cover gasket
Replace trap (study trap
capacity)
Tighten screen holder or replace
screen holder gasket
Clean
Clean
Scratches on disc or module valve seat
Disc or module valve seat is worn
Bypass valve is damaged or open
Trap is being used below minimum
operating pressure
Disc is sticking to top of cover (due to
oil, etc.)
Foreign matter or oil film on disc or
module valve seat
Inner cover is loose or module gaskets
are damaged
Outer cover is loose or outer cover
gasket is damaged
Inlet and discharge channels may be
connected, due to erosion
Screen holder is loose or screen holder
gasket is damaged
NOTE: When replacing parts with new, use the parts list for reference, and replace with parts from
the Maintenance Kit or Repair Kit. Please note that replacement parts are only available as
part of a replacement parts kit.
10. Optional Blowdown Valve BD2
Coat with Anti-Seize
Screen Holder
Troubleshooting (continued)
BD2
BD2
Clean or replace screen
Replace worn parts
Replace air vent ring or disc
holder ring
Air vent ring (bimetal) or disc holder ring
is broken and obstructing valve closure
Valve closure is obstructed by scale, etc.
Disc or valve seat is worn
For BD2 (15 - 25 mm, " - 1") For BD2 and Screen Holder (32 - 50 mm, " - 2")
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10.1 Reassembly of Blowdown Valve
The BD2 Blowdown Valve, installed in place of the screen holder, uses internal pressure to blow
out condensate/steam, dirt and scale to the atmosphere.
CAUTION
•
Installation, inspection, maintenance, repairs, disassembly, adjustment
and valve opening/closing should be carried out only by trained
maintenance personnel.
•
When disassembling or removing the product, wait until the internal pressure equals
atmospheric pressure and the surface of the product has cooled to room temperature.
• Do not tighten the BD2 valve or the BD2 valve seat in excess of the appropriate tightening
torque. Over-tightening may cause breakage to threaded portions, which may cause burns,
other injuries or damage.
1. Clean the trap, BD2 threads, and sealing surfaces, and apply a small amount of anti-seize.
2. 15 - 25 mm ( " - 1"): Check gasket for damage and replace if necessary.
32 - 50 mm ( " - 2"): Replace gasket.
3. Carefully place the gasket over the threaded portion, and position carefully so that it does not
become off-center.
4. Fasten to the steam trap with the proper torque.
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