Yoshitake TSF-8 and TSF-8F series are mechanical float steam traps designed to effectively discharge steam condensate without retention. Utilizing the difference in specific gravity between steam and condensate, these traps ensure reliable operation across varying loads. The series is equipped with a built-in thermostatic air vent to automatically discharge initial air and non-condensable gases, preventing air binding. With all main internal components constructed from stainless steel and a built-in strainer to protect against foreign substances, the TSF-8 series delivers excellent corrosion resistance and long-term durability in steam applications.

Features

1. The TSF-8 can discharge condensate effectively without retention due to reliable operation by difference in specific gravity between steam and condensate.
2. Since the main parts are attached on the cover and it is possible to dismount the cover with the body connected to the piping, inspection and parts replacement can be conducted easily.
3. Excellent corrosion resistance and durability because the main parts are all made of stainless steel.
4. A strainer is incorporated to protect the internal parts from foreign substances and improve durability.

Specifications

Model	TSF-8	TSF-8F
Nominal size	15A, 20A, 25A	15A, 20A, 25A
Application	Steam condensate	Steam condensate
Working pressure (Max. working differential pressure)	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℃	220℃
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, EN PN25 RF, ASME 150lb/300lb RF

Dimensions and Weights

TSF-8 (Screwed)

Nominal 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)

Nominal size	d	L	A	A1	H	Weight (kg)
15A	15	175	147	90	113	5.4
20A	20	195	147	90	113	6.0
25A	25	215	147	90	113	6.3

Maximum Continuous Discharge Capacity Chart

The discharge capacity shown on the chart below is the maximum value. In designing a system, select a steam trap with a sufficient safety factor (more than two times the regular level). If a discharge capacity of 500 kg/h is required, select a steam trap capable of discharging more than 1,000 kg/h.

Operation Principle

1. Start-up of the operation

At start-up, since the float is down, the valve is closed. In this state, 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, and then discharges 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, and thus condensate is continuously discharged. 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 of the product. When temperature of air or noncondensable gas decreases with condensate inflow, the air vent opens and discharges it to outside of the product.

Then, operations 2 and 3 repeat according to the inflow amount of condensate and air.

Caution for Installation

Flow Direction Options

The standard flow direction of TSF-8 is left to right. However, flow direction from right to left and top to bottom is also available. Please specify the required flow direction when ordering.

Flow direction	Symbol
Left to Right (Pre-set)	Blank
Top to Bottom	V
Right to Left	R

Installation Best Practices

• Install the product below a device which generates condensate. Slope the piping and place the product at as a low position as possible.
• To discharge condensate from the steam main, be sure to install the product so that condensate can be discharged from the bottom of the steam main by drip.
• When collecting condensate, connect the trap discharge pipe to the top of the condensate collecting pipe and install a check valve to prevent backflow.
• Install a bypass line to allow system operation to continue during maintenance.

Operational Cautions

• Do not disassemble the product at site. Disassembly may prevent the product from functioning properly.
• 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. Install a strainer (mesh size of 80 or more is recommended) at the inlet side.
• Install the product so that it is not subjected to the shock of water hammer. Do not install a quick operating valve before and/or after the product.
• Allowable tilt from horizontal line is within ±10°.