Problem
Remedy
Cause
10. Optional Blowdown Valve BD2
Reassembly Type
1. Clean the trap, BD2 threads, and sealing surfaces, and apply a small amount of anti-seize.
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.
BD2
Coat with
Anti-Seize
Torque (T) and Distance Across Flats (D)
32
21
/
(T): 30 N
·
m (22 lbf
·
ft)
(D): 17 mm ( ")
16
3
/
(T): 100 N
·
m (73 lbf
·
ft)
(D): 30 mm (1 ")
②
①
①
②
Steam leakage
or blowing
(from valve
seat)
Valve closure is obstructed by scale, etc.
Clean or replace screen
Replace worn parts
Disc or valve seat is worn
Use within pressure range
Back pressure exceeds allowable value
Clean
Disc is sticking to top of cover (due to oil, etc.)
Trap is being used below minimum operating
pressure
Use within pressure range
Air vent ring (bimetal) or disc holder ring is
broken, obstructing valve closure
Replace air vent ring or disc
holder ring
Valve
chattering
(Leakage)
Leakage from a
location other
than valve seat
(via discharge,
or from
product body)
Foreign matter or oil film on disc or valve seat
Clean
Cover is loose or module gaskets are
damaged
Tighten cover or replace
module gaskets
Tighten or replace cover, or
replace valve seat
Inlet and discharge channels may be
connected, due to erosion
Replace trap (study trap
capacity)
Screen holder is loose or screen holder
gasket is damaged
Tighten screen holder or
replace screen holder gasket
Cover is loose or sealing surface between cover
and valve seat is damaged
Scratches on disc or valve seat
Replace disc or valve seat
Disc or valve seat is worn
Replace disc or valve seat
Bypass valve is damaged or open
Replace or close bypass valve
NOTE: When replacing parts with new, use the parts list on page 5 for reference, and replace with
parts from the appropriate kit. Please note that replacement parts are only available as part of a
replacement parts kit.
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.
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English
