The TLV SH3NL is an inline repairable cast steel free float steam trap with a tight shut-off designed for the drainage of superheated or high-pressure steam mains and turbines. It features a self-modulating free float that provides continuous, smooth, low-velocity condensate discharge as loads vary. The precision-ground float, constant water seal, and three-point seating design ensure a steam-tight seal, even under no-load conditions. With only one moving part, the free float prevents concentrated wear and provides a long maintenance-free service life. A thermostatic air venting with a bimetal strip allows for fast start-up.

Features

• High rating against hydraulic shock offers excellent resistance of the float to water hammer.
• Built-in screen with large surface area ensures extended trouble-free operation.
• Easy, inline access to internal parts simplifies cleaning and reduces maintenance costs.

Specifications

Model	SH3NL
Connection	Socket Welded, Flanged
Size	DN 15, 20, 25
Orifice No.	14, 32, 45
Maximum Operating Pressure (PMO)	14, 32, 45 barg
Maximum Differential Pressure (ΔPMX)	14, 32, 45 bar
Maximum Operating Temperature (TMO)	425 °C

WARNING

PRESSURE SHELL DESIGN CONDITIONS (NOT OPERATING CONDITIONS): Maximum Allowable Pressure (PMA): 45 barg Maximum Allowable Temperature (TMA): 425 °C Local regulations may restrict the use of this product to below the conditions quoted.

Materials

No.	Description	Material	DIN	ASTM/AISI
1	Body	Cast Steel A216 Gr.WCB	1.0619	-
2	Cover	Carbon Steel A105	1.0460	-
3	Float	Stainless Steel SUS316L	1.4404	AISI316L
4	Orifice	-	-	-
5	Orifice Gasket	Graphite/Stainl. Steel SUS316L	-/1.4404	-/AISI316L
6	Air Vent Strip	Bimetal	-	-
7	Screw & Spring Washer	Stainless Steel SUS304	1.4301	AISI304
8	Cover Gasket	Graphite/Stainl. Steel SUS316L	-/1.4404	-/AISI316L
9	Cover Bolt	Alloy Steel SNB7	1.7225	A193 Gr.B7
10	Cover Nut	Carbon Steel S45C	1.0503	AISI1045
11	Screen	Stainless Steel SUS430	1.4016	AISI430
12	Screen Holder	Cast Stainl. Steel A351 Gr.CF8	1.4312	-
13	Screen Holder Gasket	Soft Iron SUYP	1.1121	AISI1010
14	Orifice Plug	Cast Stainl. Steel A351 Gr.CF8	1.4312	-
15	Orifice Plug Gasket	Soft Iron SUYP	1.1121	AISI1010
16	Socket	Carbon Steel S25C	1.1158	AISI1025
16	Flange	Carbon Steel A105/Cast Steel A216 Gr.WCB	1.0460/1.0619	-
17	Nameplate	Stainless Steel SUS304	1.4301	AISI304

Dimensions

SH3NL Socket Welded (mm)

DN	L	H1	W1	S	φD	φC	h	Weight (kg)
15	200	125	160	83	32	21.8	12	8.5
20	200	125	160	83	38	27.2	14	8.5
25	200	125	160	83	47	33.9	14	8.5

SH3NL Flanged (mm)

DN	L (150RF)	L (300RF)	L (600RF)	H1	W1	S	Weight (kg)
15	202	202	202	125	160	83	9.0
20	202	202	202	125	160	83	9.6
25	202	202	202	125	160	83	10

(Weight is for Class 600 RF)

Discharge Capacity

1. Line numbers within the graph refer to orifice numbers.
2. Differential pressure is the difference between the inlet and outlet pressure of the trap.
3. Recommended safety factor: at least 1.5.

DANGER

DO NOT use traps under conditions that exceed maximum differential pressure, as condensate back up will occur!

Installation

1. Before installation, be sure to remove all protective seals.
2. Install the trap within the allowable inclination, as shown below. Also make sure that the arrow mark on the body corresponds with the direction of flow.
3. Before installing the trap, blow out the inlet piping to remove all dirt and oil.
4. Install the trap in the lowest part of the pipeline or equipment so the condensate flows naturally downward into the trap by gravity. The inlet pipe should be as short and have as few bends as possible.
5. Support the pipes properly within 0.8 meters (2.5 ft.) on either side of the trap.
6. Install a bypass valve to discharge condensate, and inlet and outlet valves to isolate the trap in the event of trap failure or when performing maintenance.
7. Install a check valve at the trap outlet whenever more than one trap is connected to the condensate collection pipeline.

Allowable Inclination

Inspection and Maintenance

Operational inspections should be performed at least twice per year, or as called for by trap operating conditions. Steam trap failure may result in a temperature drop in the equipment, poor product quality or losses due to steam leakage.

DANGER

NEVER apply direct heat to the float. The float may explode due to increased internal pressure, causing accidents leading to serious injury or property and equipment damage.

Parts Inspection Procedure

Part	Inspection Item
Body, Cover	Check inside for damage, dirt, grease, oil film, rust or scale
Gaskets	Check for warping or damage
Air Vent Strip	Check for damage
Screen	Check for clogging, corrosion or damage
Float	Check for deformation, damage, oil film or water inside
Orifice	Check for rust, scale, oil film, wear or damage

Tightening Torque and Distance Across Flats (SH3NL)

Part	Torque (N·m)	Distance Across Flats (mm)
Cover Nut	60	17
Orifice	60	17
Orifice Plug	200	38
Screen Holder	200	38
Screw	0.3	+

Troubleshooting

Problem	Cause	Remedy
No condensate is discharged (blocked) or discharge is poor	Float is damaged or filled with condensate	Replace with new float
	The float is sticking to the orifice	Clean
	Orifice, screen or piping is clogged with rust or scale	Clean
	Steam locking has occurred	Blowdown through the bypass or close the trap inlet valve and allow the trap to cool
	Flow exceeds trap's rated capacity	Check specifications and reselect trap suitable for actual flow
	The trap operating pressure exceeds the maximum specified pressure, or there is insufficient differential pressure between the trap inlet and outlet	Compare specifications and actual operating conditions
Steam is discharged or leaks from the trap outlet (blowing) (Steam leakage)	Rust and scale have accumulated around the orifice or under the float	Clean
	Scratches on the orifice	Replace with a new orifice
	Float is deformed or coated with scale	Clean or replace the float
	Trap is installed above the maximum allowable inclination angle	Correct the installation
	Vibration of trap occurs	Lengthen inlet piping, then fasten it securely
	The air vent strip is damaged	Replace with a new air vent strip
Steam leaks from a place other than the trap outlet	Deterioration of or damage to gaskets	Replace with new gaskets
	Improper tightening torque on cover nuts was used	Tighten to the proper torque
Float is frequently damaged	Water hammer occurs	Examine the piping for problems that can cause water hammer