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10. Optional Blowdown Valve BD2
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
• 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.
10.1 Reassembly of Blowdown Valve
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.
Torque (T) and Distance Across Flats (D)
①
②
10.2 Operation Instructions for BD2
Note: Do not leave the vicinity while the blowdown valve is in the open position.
CAUTION
outlet to avoid contact with internal fluids that will be discharged. Operate the valve slowly and
surely, taking care to avoid the area from which internal fluids are discharged and any fluids
deflected off piping or the ground etc. Failure to do so may result in burns or other injury.
• Do not excessively loosen the BD2 valve when opening the blowdown valve. The valve stopper
pin installed to prevent the BD2 valve from being removed may break and internal pressure may
result in the BD2 valve being blown off, leading to injuries, damage and fluid discharge, causing
burns.
1. With two wrenches, firmly hold the BD2 valve seat (screen holder) ② (22 mm,
while slowly opening the BD2 valve ① (17 mm,
will be discharged through the hole in the center of the blowdown valve as the valve opens.
2. Close the BD2 valve ① and tighten to a torque of 30 N·m (22 lbf·ft), and confirm that there is
no leakage. If leakage continues, dirt or scale may prevent the valve from sealing. Open and
blow out again, then try to close once more.
BD2 Valve Seat
(Screen Holder)
• Installation, inspection, maintenance, repairs, disassembly, adjustment
and valve opening/closing should be carried out only by trained
maintenance personnel.
BD2 Valve
F46
All connections and sizes
BD2
Flanged 15 - 25 mm ( "-1")
Valve Seat
Screwed & Socket Welded
(Screen
15, 20 mm ( ",
F32
Holder)
Screwed & Socket Welded
25 mm (1")
• Always wear eye protection and heat-resistant gloves when operating the
blowdown valve. Failure to do so may result in burns or other injury.
• When operating the blowdown valve, stand to the side well clear of the
Screen
②
Valve Stopper Pin
BD2
1
")
1
/
3
/
2
4
21
"). Be careful to avoid contact with fluid that
/
32
Screen Holder Gasket
BD2 Valve ①
Discharge Hole
̶ 14 ̶
Coat with
Anti-Seize
(T): 30 N ・ m (22 lbf ・ ft)
(D): 17 mm (
21
/
(T): 100 N ・ m (73 lbf ・ ft)
(D): 30 mm (1
3
/
(T): 60 N ・ m (43 lbf ・ ft)
2
7
/
(D): 22 mm (
(T) : 150 N ・ m (110 lbf ・ ft)
(D) : 38 mm (1
7
/
") in place
8
")
32
/
")
16
")
8
1
/
")
2
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