TLV P46SRW is an inline repairable thermodynamic disc steam trap with a thermostatic air vent. It can be used without adjustment for medium capacity applications between 0.03 and 4.6 MPaG, such as steam mains, tracers, and coils. The trap discharges condensate at a temperature slightly lower than the saturation temperature. The built-in bimetal ring provides quick thermostatic air venting, significantly reducing startup time by discharging initial air and cold condensate.

Features

• Inline replaceable module valve seat.
• Air jacketing reduces no-load cycling.
• Lapped disc provides a steam-tight seal without air binding.
• Built-in screen for trouble-free service.
• Bimetal ring provides quick thermostatic air venting.
• Hardened stainless steel working surfaces.

Configuration and Exploded View

No.	Description	No.	Description
1	Body	8	Nameplate
2	Module Valve Seat	9	Inner Module Gasket
3	Cover	10	Screen
4	Disc	11	Screen Holder Gasket
5	Disc Holder Ring	12	Screen Holder
6	Air Vent Ring (Bimetal)	13	Cap
7	Outer Module Gasket

Proper Installation and Piping

WARNING

Install properly and DO NOT use this product outside the recommended operating pressure, temperature and other specification ranges. DO NOT subject the trap to condensate loads that exceed its discharge capacity. Failure to observe this precaution may lead to condensate accumulation, resulting in reduced equipment performance or damage.

1. Before installation, remove all protective seals and blow out the inlet piping to remove dirt and oil.
2. The trap can be installed horizontally or vertically, but make sure the arrow on the body points in the direction of flow.
3. Install the trap in the lowest part of the pipeline or equipment so condensate flows naturally by gravity. The inlet pipe should be as short and have as few bends as possible.
4. Support the pipes properly within 800 mm on either side of the trap.
5. Install a bypass valve to discharge condensate, and inlet/outlet valves to isolate the trap during maintenance.
6. Install a catchpot of the proper diameter. To prevent rust and scale from flowing into the trap, connect the inlet pipe 25–50 mm above the base of the T-pipe.

Operational Check

A visual inspection can aid in determining the necessity for immediate maintenance if the trap is open to atmosphere. Otherwise, use diagnostic equipment such as TLV TrapMan.

Condition	Description
Normal	Condensate is discharged in a short blast followed by a longer period of no drainage. Flash steam may be seen during and slightly after discharge.
Blocked	No condensate is discharged. The trap is quiet and surface temperature is low.
Blowing	Live steam continually flows from the outlet, and there is a continuous metallic sound.
Steam Leakage	Live steam is discharged through the trap outlet together with condensate, accompanied by a high-pitched sound.
Chattering	The trap does not close properly. Steam is discharged in short rapid bursts.

Inspection and Maintenance

Operational inspections should be performed at least twice per year, or as called for by operating conditions.

Part	Inspection Procedure
Body, Cover	Check inside for damage, dirt, grease, oil film, rust or scale
Gaskets	Check for warping or damage
Screen	Check for clogging or corrosion
Disc, Rings	Check for damage or wear
Module Valve Seat Surface	Check for damage or wear

Tightening Torques:

• Cover (P46SRW): 320 N·m (Distance Across Flats: 55 mm)
• Screen Holder: 100 N·m (Distance Across Flats: 30 mm) Note: Coat all threaded portions with anti-seize.

Troubleshooting

Problem	Cause	Remedy
No condensate is discharged (blocked)	Screen clogged with rust/scale; Air vent or disc holder ring broken; Disc sticking; Steam-locking	Clean; Replace ring; Perform bypass blow-down and cool trap
Steam leakage or blowing	Valve closure obstructed by scale; Worn parts; Back pressure exceeds allowable value	Clean or replace screen; Replace worn parts; Use within pressure range
Valve chattering	Foreign matter on disc/seat; Scratches or wear	Clean; Replace disc or valve seat
Leakage from other locations	Cover loose; Gaskets damaged	Tighten cover; Replace module gaskets

Optional Blowdown Valve BD2

The BD2 Blowdown Valve, installed in place of the screen holder, uses internal pressure to blow out condensate, steam, dirt, and scale to the atmosphere. Always wear eye protection and heat-resistant gloves when operating the blowdown valve. Do not excessively loosen the BD2 valve when opening, as the stopper pin may break and cause the valve to blow off.