TLV L21S and L32S are balanced pressure thermostatic steam traps with a "fail open" design. The L21SC and L32SC models include an internal check valve. They can be used without adjustment for medium capacity applications and pressures up to 2.1 or 3.2 MPaG (300 or 450 psig). These models are suitable for steam-using equipment that discharges condensate at temperatures slightly below saturation temperature, such as tracer lines and light process equipment.

Features

• "Fail open" feature will not hold back condensate in the steam space.
• Rugged, yet light construction, withstands superheat and water hammer.
• Cyclic operation with fixed subcooling throughout the whole pressure range (up to 6 °C).
• Outstanding air venting capability.
• Compact, yet with high capacity.
• Easy to clean and maintain.
• Hardened stainless steel valve seat.
• Built-in screen with large surface area.

WARNING

To avoid malfunctions, product damage, accidents or serious injury, install properly and DO NOT use this product outside the specification range. Local regulations may restrict the use of this product to below the conditions quoted.

Specifications

Model	L21S / L21SC	L32S / L32SC
Material	Carbon Steel / Stainless Steel	Carbon Steel / Stainless Steel
Connection	Screwed, Socket Welded, Flanged	Screwed, Flanged
Size (mm)	DN 15, 20, 25	DN 15, 20, 25
Max. Operating Pressure (PMO)	2.1 MPaG	3.2 MPaG
Min. Operating Pressure	0.01 MPaG	0.01 MPaG
Maximum Back Pressure	90% of inlet pressure	90% of inlet pressure
Type of X-element	C6	C6

Configuration

1. Body
2. Cover
3. X-element
4. Screen inside/outside
5. Screen Holder Gasket
6. Screen Holder
7. Valve Seat
8. X-element Guide
9. Spring Clip
10. Cover Gasket
11. Cover Bolt
12. Nameplate

Discharge Capacity

1. Pressure differential is the difference between the inlet and outlet pressure of the trap.
2. Recommended safety factor: at least 2.

Proper Installation

1. Horizontal installation is recommended (with the cover facing upwards). Vertical installation is possible; however there may be a slight increase in the amount of steam leakage. Do not install in a reverse installation or sideways.
2. Before installing the steam trap, blow out the inlet piping to remove all dirt and oil.
3. Install a bypass valve, and inlet and outlet valves for maintenance or trap failure situations.
4. Install the trap in the lowest part of the pipeline or equipment so the condensate flows into the trap by gravity.
5. Install a check valve at the trap outlet of L21S, L32S whenever the condensate discharge pipe leads to a tank or recovery line.
6. Support the pipes within 0.8 meters (2.5 ft) on either side of the trap.

Troubleshooting

Problem	Cause	Remedy
No condensate is discharged (blocked) or discharge is poor	X-element is stuck to the valve seat	Clean
	Valve seat is clogged	Clean
	Screen is clogged with rust or scale	Clean
	Trap operating pressure exceeds maximum specified operating pressure	Study inlet pressure
Steam leakage or blow-off	Valve closure is obstructed by rust, etc.	Clean (inspect screen as well)
	X-element is worn or damaged	Replace X-element
	Valve seat is worn or damaged	Replace valve seat or cover
Leakage from other location	Cover is loose or gaskets are worn or damaged	Tighten cover or replace gasket