Yoshitake TS-8 is a thermostatic by-pass steam trap that introduces welded bellows to meet a variety of industrial requirements. By integrating four functions (STOP, BY-PASS, TRAP, and TEST) into a single unit, it helps reduce piping and construction work costs significantly. The trap is designed to operate at 12°C below the saturation temperature without discharging live steam, making it highly efficient for steam condensate applications.

Features

• Four functions (STOP / BY-PASS / TRAP / TEST) can be switched easily with a spanner or monkey wrench.
• The integrated bypass function helps reduce piping and construction work costs significantly.
• Applicable in wide working pressure range due to welded bellows.
• Works at a 12°C lower temperature than the saturating temperature and discharges no live steam.
• Trap check can be performed without being affected by back pressure.
• The cock and valve, both made of stainless steel, are integrated into one unit.
• Equipped with built-in strainer.
• Installable in any direction.

Specifications

Model	TS-8
Application	Steam condensate
Maximum pressure	1.0 MPa
Minimum working differential pressure	0.03 MPa
Max. temperature	183°C
Body Material	Ductile cast iron
Cock (Valve seat) Material	Stainless steel
Bellows (Valve) Material	Stainless steel
Strainer Material	Stainless steel
Connection	JIS 10K FF flanged

WARNING

When performing an airtightness test using water or air, keep the pressure at 0.5 MPa or less.

Dimensions and Weights

Nominal size	L (mm)	Weight (kg)
15A	156	3.9
20A	160	4.4
25A	160	5.5

(Note: TS-7 model has JIS Rc screwed connections and different dimensions.)

Maximum Continuous Discharge Capacity

Maximum Continuous Discharge Capacity Table (L/h)

Differential pressure (MPa)	0.03	0.05	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1.0
Hot water with minus 20°C of saturated steam temperature	560	730	1020	1450	1780	2050	2300	2500	2700	2900	3100	3250

INFO

The discharge capacities shown in the chart and table above are the maximum values. In designing a system, select a steam trap with a sufficient safety factor (at least three times the regular level).

Switching Mechanism and Operation

All steam traps are set at the "STOP" position when delivered. The function can be changed by turning the hexagonal top cover using a monkey wrench to align the marker to the desired function.

1. STOP: Fluid does not flow into the trap and out of the bypass because the inlet, the outlet, and the bypass are closed. The strainer can be cleaned and the bellows can be inspected without any condensate flow.
2. BY-PASS: Fluid flows through the bypass directly to the outlet. Select this position when blowing the piping during plumbing or discharging a large quantity of condensate before starting operation. (Do not use at BY-PASS condition for a long time).
3. TRAP: In this position, the steam trap performs regular trap operation, and condensate flows from the inlet to the outlet through the trap.
4. TEST: Condensate is discharged from the inlet to the outlet for testing through the trap, allowing the operation to be checked. This check can be carried out with the outlet closed and without being affected by back pressure.

Trap Mechanism

1. When initially passing air: The bellows is contracted and the entire valve is fully opened to discharge air and low temperature condensate swiftly.
2. When closing the valve: As condensate temperature increases, the sealing liquid inside the bellows evaporates, inner pressure increases, the bellows expands, and the valve is closed.
3. When opening the valve: When condensate stops flowing and temperature decreases, the sealing liquid condenses, inner pressure decreases, the bellows contracts, and condensate is discharged.

Installation Procedures

1. Carefully blow the piping before installing the steam trap.
2. Connect the steam trap to the piping according to its arrow indicating the direction of flow.
3. Slope the piping and place the product at as low a position as possible to make condensate flow by its own weight.
4. Do not insulate the piping inlet and the steam trap.
5. To install in a main steam pipe, provide a drip leg at the inlet side.
6. Secure enough space for switching operation of the cock and maintenance (cleaning strainer and inspecting bellows).
7. If discharge capacity is not enough, install more than one trap in parallel with inlets at the same level.
8. Do not install the steam trap in a place where ambient temperature is higher than the discharged condensate.

DANGER

When discharging into the air, ensure the condensate is discharged into a safe place to prevent burns or injury from blowing off.

Maintenance

• Bellows Inspection: Set the cock to STOP or BY-PASS. Cool the bellows sufficiently until the cover surface temperature is below 80°C. Apply a wrench to the hexagonal top cover to hold the cock, remove the four bolts, and inspect.
• Cock Assembly: To clean or repair, stop steam and release pressure, remove the cap and U-nut. Tighten the U-nut to 2000 N-cm during reassembly.