Yoshitake TB-20F is an inverted bucket steam trap designed for steam condensate applications. Featuring a ductile cast iron body and stainless steel internal parts, it provides excellent durability and reliable performance. The unique internal structure includes a hemispherical valve and a stainless steel upper plug for enhanced wear resistance. This trap achieves super energy saving by utilizing intermittent operation to remove the air adiabatic wall in the heat exchanger, considerably increasing heat efficiency. The TB-20F model features JIS 10K FF flanged connections and operates at a maximum pressure of 1.0 MPa and temperatures up to 220°C.

Features

• Excellent durability ensured by unique internal structure (hemispherical valve, etc).
• The upper plug is made of stainless steel, and is excellent in wear resistance.
• Reliable performance due to all stainless steel made internal parts and the unique internal structure.
• Super energy saving since intermittent operation removes air adiabatic wall in the heat exchanger and increases heat efficiency considerably.

Specifications

Model	TB-20	TB-20F
Nominal Size	15A, 20A, 25A	15A, 20A, 25A
Connection	JIS Rc screwed, JIS 20K FF flanged	JIS 10K FF flanged
Application	Steam condensate	Steam condensate
Maximum Pressure	2.0 MPa	1.0 MPa
Max. Differential Pressure (A)	0.3 MPa	0.3 MPa
Max. Differential Pressure (B)	0.6 MPa	0.6 MPa
Max. Differential Pressure (C)	1.0 MPa	1.0 MPa
Max. Differential Pressure (D)	1.6 MPa	-
Maximum Temperature	220°C	220°C
Material (Body)	Ductile cast iron	Ductile cast iron
Material (Valve)	Stainless steel (Heat treated)	Stainless steel (Heat treated)
Material (Valve seat)	Stainless steel (Heat treated)	Stainless steel (Heat treated)

Note

Available with ASME and EN flanged.

Discharge Capacity Chart

Recommendation

The discharge capacity shown here is a continuous discharge capacity at the indicated differential pressure. In general, select a steam trap with a safety factor twice or threefold the regular level.

Dimensions and Weights

TB-20F Dimensions (mm)

Nominal size	L	H	H1	A	Weight (kg)
15A	175	183	94	117	5.4
20A	175	183	94	117	6.0
25A	175	183	94	117	6.3

TB-20 Dimensions

Nominal size	L	H	H1	A	Weight (kg)
15A	136	183	94	117	4.3
20A	136	183	94	117	4.3
25A	136	183	94	117	4.3

INFO

The dimensions of the product with JIS 10K FF flanged and the product with JIS 20K FF flanged are identical. The thickness of JIS 10K FF flanges conforms to that of JIS 20K FF flanges.

Outline of Operation

No.	Name of parts
1	Body
2	Cover
3	Bucket P
4	Valve
5	Valve seat

(1) Start of discharge The air in a trap is pushed up with low-temperature condensate, passes along an upper valve seat, and is discharged at an outlet side. Low-temperature condensate also passes along the inside and the perimeter of a bucket by inflow of high-temperature condensate, and is discharged from an upper valve seat to an outlet side.

(2) Closing operation If steam enters in a bucket following high-temperature condensate, a bucket will come floating and will close a valve seat. If there is no inflow of condensate, carrying out a closed valve is continued.

(3) Operation to discharge condensate If condensate flows in again, a bucket will lose lift, and will sink. A valve will be opened and condensate will be discharged from a valve seat at an outlet side. Henceforth, the operation of (2) and (3) is repeated according to the amount of generating of condensate.

Installation & Operation Precautions

Warnings

• Connect the outlet side piping to safe places where human damage does not occur, even if condensate is blown off.
• Confirm that there is no danger even if steam and condensate are flown to the end of piping. Blow-off of steam or condensate may cause burn.
• Do not stand in front of the outlet opening of piping at confirmation of trap operation. Large amount of condensate must be discharged at the first operation.

Cautions

• Before connecting the trap to the piping, be sure to remove dust and dirt inside the piping. Take care not to enter sealing tapes or some sealant into the trap.
• Confirm the direction of the flow and the trap and install the trap correctly.
• Connect the trap by turning up in horizontal piping.
• Support or fix the piping certainly.
• Prevent the freeze of condensate. If condensate freezes, it may cause the damage of trap.
• Avoid using a quick-operating valve in the vicinity of the trap to prevent water-hammer.
• Install a trap in the lowest possible position to collect condensate to the trap by their weight. Make a slope to piping.
• Confirm there is condensate in the trap at the first operation. If the filling up of condensate does not exist, steam can be blown out continuously.

Troubleshooting

Trouble	Cause	Measure
No discharge	1. Operating pressure is higher than the proper pressure of the trap. 2. Valve seat is clogged. 3. Bucket vent is clogged. 4. Screen is clogged. 5. Breakage of trap by freezing or water-hammer.	1. Replace the trap. 2. Disassemble and clean the valve seat. 3. Disassemble and clean the bucket vent. 4. Disassemble and clean the screen. 5. Replace the trap.
Poor discharge	1. Too low pressure difference due to high back pressure. 2. Screen is clogged.	1. Examine inlet/outlet pressure. 2. Disassemble and clean the screen.
Continuous blowing off	1. Foreign material between valve and valve seat. 2. Flaw or wear between valve and valve seat. 3. Low discharge capacity. 4. Lever holder is deformed. 5. Too high back pressure. 6. Disappearance of condensate.	1. Disassemble and clean. 2. Replace by conversion kit. 3. Replace the trap. 4. Replace the trap. 5. Examine piping. 6. Make condensate flow into bucket.
Leakage to outside	1. Leakage between body and cover. 2. Leakage around plug. 3. Breakage of trap by freezing.	1. Replace gasket. 2. Rewind sealing tapes and reassemble plug. 3. Replace the trap.

Exploded View & Maintenance

Conversion Kits

No.	Pressure range
K-93070	(A): 0.01 - 0.3 MPa
K-93071	(B): 0.2 - 0.6 MPa
K-93072	(C): 0.3 - 1.0 MPa
K-93073	(D): 0.6 - 1.6 MPa

Maintenance Cautions

• Before starting disassembly and inspection, make sure that the residual pressure in the trap, piping and equipment is relieved and wait until the temperature of them are sufficiently lowered.
• Do not touch the trap with bare hands.
• Use new gaskets at the time of reassembly.