Yoshitake TSF-8F and TSF-8 float steam traps are designed for efficient steam condensate discharge. They feature a ductile cast iron body and stainless steel internal components, providing excellent corrosion resistance and durability. The traps utilize the specific gravity difference between steam and condensate to provide stable and highly efficient continuous discharge.

Key Features

1. Stable and highly efficient continuous discharge based on the specific gravity difference between steam and condensate.
2. Main components are attached to the cover, allowing for easy disassembly, inspection, and parts replacement directly on installed piping.
3. Main components are made of stainless steel, offering excellent corrosion resistance.
4. A built-in strainer effectively protects internal parts from foreign substances, ensuring excellent durability.

Specifications

Model	TSF-8	TSF-8F
Nominal size	15A, 20A, 25A	15A, 20A, 25A
Application	Steam condensate	Steam condensate
Working pressure (Max. diff.)	TSF-8-5: 0.01-0.5 MPa (0.5 MPa) TSF-8-10: 0.01-1.0 MPa (1.0 MPa) TSF-8-21: 0.01-2.1 MPa (2.1 MPa)	TSF-8F-5: 0.01-0.5 MPa (0.5 MPa) TSF-8F-10: 0.01-1.0 MPa (1.0 MPa) TSF-8F-21: 0.01-2.1 MPa (2.1 MPa)
Max. temperature	220°C	220°C
Body Material	Ductile cast iron	Ductile cast iron
Float Material	Stainless steel	Stainless steel
Valve, valve seat Material	Stainless steel	Stainless steel
Connection	JIS Rc screwed, NPT screwed	JIS 10K/20K FF flanged, EN PN25 RF, ASME 150lb/300lb RF
Flow direction	Left to Right (Standard)	Left to Right (Standard)

Flow Direction Options

The standard flow direction is from left to right. Suffix "V" is used for "Top to Bottom" flow, and "R" for "Right to Left" flow.

Flow Direction	Mark
Left to Right (Standard)	Blank
Top to Bottom	V
Right to Left	R

Dimensions and Weight

TSF-8 (Screwed)

Size	d	L	A	A1	H	Weight (kg)
15A	Rc 1/2	121	147	90	113	3.7
20A	Rc 3/4	121	147	90	113	3.7
25A	Rc 1	145	147	90	113	4.1

TSF-8F (Flanged)

Size	d	L	A	A1	H	Weight (kg)
15A	15	175	147	90	113	5.2
20A	20	195	147	90	113	6.0
25A	25	215	147	90	113	7.1

Maximum Continuous Discharge Capacity

1. Discharging capability of the steam trap differs by working differential pressure (difference between inlet pressure and outlet pressure). In selecting discharge capacity, consider outlet pressure.
2. The discharge capacity shown in the charts below is the maximum value. In designing a system, select a steam trap with a sufficient safety factor (two times the regular level).

Operation

1. Start-up of the operation At start-up, since the float is down, the valve is closed. Air in the system and piping is discharged out through the air vent which is opened. When condensate flows into the product, the float lifts up and opens the valve, discharging condensate. Air is continuously discharged out from the air vent.

2. Condensate discharging operation When steam flows into the product, internal pressure of the air vent rises by steam temperature, and the air vent closes. According to the amount of condensate inflow, the float position moves up and down changing the opening degree of the valve, continuously discharging condensate. The float moves down and the valve closes when condensate inflow stops.

3. Air vent operation When air or non-condensable gas flows into the product, it accumulates in the upper part. When temperature decreases with condensate inflow, the air vent opens and discharges it to the outside. Operations 2 and 3 repeat according to the inflow amount of condensate and air.

Precaution for Installation

Installation Warnings

• In order to discharge condensate to the atmosphere, lead the outlet to a safe place where there is no possibility of physical damage even if condensate blows out.
• Before connecting the product to piping, remove foreign substances and scale from the piping.
• Check the direction of the product so that the fluid flowing and the arrow marked on the product are in the same direction.
• Allowable tilt from the horizontal line is within ±10°.
• Secure enough space for maintenance (such as cleaning of strainer), inspections, and repair.
• Install a bypass line. The system has to stop operation during inspection and maintenance if the bypass line is not installed.

Maintenance and Troubleshooting

Conduct daily and periodic inspections in order to maintain the optimal performance of the product.

Daily inspection (once a day)

• Discharge condition of condensate: Condensate is discharged smoothly.
• Outside leakage: No outside leakage of condensate or steam.

Periodic inspection (once a year)

• Seating surfaces of the valve and valve seat: No scratch, abrasion, or foreign substances.
• Shape of float (P): No deformation or damage.
• Dirt on the screen: No clogging on the screen.

Troubleshooting

Trouble	Cause	Remedy
Condensate is not discharged.	1. Blockage of foreign substances in a discharge hole. 2. The screen is clogging. 3. The float (P) is damaged. 4. Breakage due to abnormal pressure rising. 5. Steam locking. 6. "TOP" and "BOTTOM" signs are in wrong positions.	1. Disassemble and clean it. 2. Disassemble and clean it. 3. Replace it with a new one. 4. Replace the product and use within working pressure. 5. Change the piping system layout. 6. Adjust direction of the name plate.
Continuous blowout.	1. Foreign substances stuck on valve, seat or air vent. 2. Abrasion or scratches on the parts. 3. Insufficient capacity of the product. 4. "TOP" and "BOTTOM" signs are in wrong positions.	1. Disassemble and clean them. 2. Replace the parts with new ones. 3. Replace with a model of sufficient capacity. 4. Adjust direction of the name plate.
Steam leakage.	1. Leakage due to loosening of the bolt. 2. Leakage due to abnormal pressure rising.	1. Replace cover gasket and retighten bolt. 2. Replace the product and use within working pressure.

Disassembly and Reassembly

Disassembly

1. Loosen the bolts fixing the cover with a ring wrench (19 mm), and remove the cover and gasket from the body. Pull out the screen from the body.
2. Pull out the spindle from the float holder and remove the float (P) assembly.

Reassembly

1. Connect the float holder and float (P) assembly with the spindle. Check that the float assembly moves smoothly.
2. Attach the screen to the body. The screen can be inserted from either end.
3. Install the cover gasket to the cover. Make sure to use a new cover gasket and apply lubricant agent.
4. Install the cover to the body. Tighten the bolt with a torque wrench (19 mm) with a torque of 45 N·m. Do not use an impact wrench.