Yoshitake TSD-7 and TSD-7F are disc type steam traps featuring a built-in bypass, designed to meet a wide variety of needs in building facilities and industrial applications. The integrated bypass significantly reduces piping and construction costs by eliminating the need for a separate bypass line. Utilizing a bimetal ring, these steam traps effectively solve the air-binding problem by ensuring a smooth discharge of cold condensate and air at the start of operation, which allows steam equipment to start up efficiently.

The traps are constructed with a durable ductile cast iron body and stainless steel internal components. The valve disc and seat undergo a special heat treatment for extended durability. A distinctive switching cock allows operators to easily change between four operational modes (STOP, BY-PASS, TRAP, and TEST) using a simple wrench, streamlining maintenance and operational checks without being affected by back pressure.

Features

• Multi-Function Cock: Four functions (STOP, BY-PASS, TRAP, and TEST) can be switched easily with an optional handle, spanner, or monkey wrench.
• Cost Efficiency: The integrated bypass function helps reduce piping and construction work costs significantly.
• Air Venting: Bimetal solves the air-binding problem and ensures a smooth discharge of cold condensate or air at startup.
• Easy Inspection: The product's operation can be checked via the TEST position without being affected by back pressure.
• Durability: The stainless steel valve disc and valve seat are subjected to special heat treatment.
• Maintainability: The disc, valve seat, and bimetal can be easily replaced without removing the body from the piping. Equipped with a built-in strainer.
• Flexible Installation: Can be installed vertically or horizontally as desired (ensure the cover is not under the horizontal level).

Specifications

Feature	TSD-7	TSD-7F
Nominal Size	15A, 20A, 25A	15A, 20A, 25A
Application	Steam condensate	Steam condensate
Working Pressure	0.035 - 1.0 MPa	0.035 - 1.0 MPa
Allowable Back Pressure	50% of inlet pressure	50% of inlet pressure
Maximum Temperature	183℃	183℃
Connection	JIS Rc screwed	JIS 10K FF flanged
Installation Posture	At any angle between vertical and horizontal	At any angle between vertical and horizontal
Body Material	FCD450 Ductile cast iron	FCD450 Ductile cast iron
Disc & Seat Material	SUS420J2 Stainless steel	SUS420J2 Stainless steel

Maximum Continuous Discharge Capacity

Sizing Recommendation

In designing a system, select a steam trap with a sufficient safety factor (four to five times the regular level). For example, if a discharge capacity of 100 kg/h is required, select a steam trap capable of discharging 400 to 500 kg/h.

(∆P: Working differential pressure MPa. The discharge capacity shown on the chart is the maximum value.)

Dimensions and Weights

Model TSD-7 (Screwed)

Nominal Size	d	H (mm)	Weight (kg)
15A	Rc 1/2	107	2.5
20A	Rc 3/4	109	2.6
25A	Rc 1	115	2.7

Model TSD-7F (Flanged)

Nominal Size	L (mm)	Weight (kg)
15A	156	4.1
20A	160	4.6
25A	160	5.7

Cock Operation and Function Changeover

All steam traps are set at the "STOP" position when delivered. In order to switch the cock, be sure that each mark (▲) of the functions meets the mark (▼) on the indicator accurately. If not, the product does not function correctly.

1. STOP: Fluid is blocked off since the inlet, outlet, and bypass are closed. Select this position for cleaning the strainer and inspecting the disc and seat.
2. BY-PASS: Fluid flows through the bypass directly to the outlet. Select this position to blow the piping during plumbing or to discharge a large quantity of condensate at start-up. Do not keep the product in this function for a long period.
3. TRAP: The product performs regular trap operation. Condensate is discharged from the inlet to the outlet through the trap without flowing out from the bypass.
4. TEST: Condensate is discharged from the inlet to the test-line outlet through the trap so that trap operation can be verified. Test can be carried out without being affected by back pressure.

Safety Caution

Do not switch the position of the cock during disassembly. It is dangerous because steam may blow out.

Installation Guidelines

1. Carefully blow the piping to remove foreign substances and scale before installing the steam trap.
2. Connect the steam trap according to the arrow indicating the direction of flow.
3. Slope the piping and place the product at as low a position as possible to allow condensate to flow into the product by gravity.
4. Do not insulate the piping inlet and the steam trap.
5. To install the product in a main steam pipe, provide a drip leg at the inlet side of the product.
6. Secure enough space for switching the cock and for maintenance (cleaning the strainer, inspection).
7. If discharge capacity is not enough, install more than one trap. Ensure their inlets are at the same level.
8. Do not install the steam trap in a place where ambient temperature is higher than the condensate to be discharged.

Troubleshooting

Trouble	Cause	Remedy
Condensate not discharged	1. The cock is positioned at "STOP." 2. Blockage in a discharge hole of valve seat. 3. Strainer is clogged. 4. Damage from abnormal pressure rising. 5. Steam locking.	1. Switch the cock to "TRAP." 2. Disassemble and clean the valve seat. 3. Disassemble and clean the strainer. 4. Replace the product. 5. Change the piping system layout.
Continuous blow-off	1. The cock is positioned at "BY-PASS." 2. Foreign substances stuck on disc/seat. 3. Scratches or wear on disc/seat. 4. Back pressure exceeds permissible value. 5. Pressure is less than minimum working pressure.	1. Switch the cock to "TRAP." 2. Disassemble and clean these parts. 3. Disassemble and replace these parts. 4. Keep back pressure within limits. 5. Replace with an appropriate model.
Outside leakage	1. Joint loose between cock and valve seat. 2. Joint loose between cover and valve seat. 3. Damage from freezing or water hammer.	1. Replace gaskets and assemble. 2. Replace gaskets and assemble. 3. Replace the product.
No-load operation	1. Scratches or wear on disc/seat. 2. Foreign substances stuck between disc and seat. 3. Used outdoors in rainy conditions.	1. Replace the parts. 2. Disassemble and clean. 3. Equip product with an optional rain cover.

Structure and Parts

No.	Part Name	Material
1	Body	Ductile Cast Iron (FCD450)
2	Cover	Cast Stainless Steel (SCS13)
3	Valve Seat	Cast Stainless Steel (SCS2A)
4	Cock	Cast Stainless Steel (SCS13)
5	Cap	Ductile Cast Iron (FCD450)
6	Valve	Brass (C3604)
7	Disc	Stainless Steel (SUS420J2)
8	Ring	Stainless Steel (SUS304)
9	Bi-Metal	-
10	Strainer	Stainless Steel (SUS304)
11	Guide	Stainless Steel (SUS304)