TLV SJH7NB and SJH7VB are inline repairable free float steam traps with a thermostatic air vent (X-element). They are suitable for a wide range of applications with small-to-large capacities and pressures up to 32 barg, such as heat exchangers, tank heaters, dryers and process equipment. The traps discharge condensate continuously and automatically, at a temperature slightly lower than the saturation temperature. The SJH7NB and SJH7VB models optionally include an integral plate-type bimetal air vent unit for enhanced air venting performance.

Safety Considerations

WARNING

WARNING

• NEVER apply direct heat to the float. The float may explode due to increased internal pressure, causing accidents leading to serious injury or damage to property and equipment.
• Install properly and DO NOT use this product outside the recommended operating pressure, temperature and other specification ranges.
• DO NOT use this product in excess of the maximum operating pressure differential. Such use could make discharge impossible (blocked).
• Do not subject this product to condensate loads that exceed its discharge capacity. Failure to observe this precaution may lead to condensate accumulation upstream of the trap.

TIP

Use hoisting equipment for heavy objects (weighing approximately 20 kg or more). Failure to do so may result in back strain or other injury if the object should fall.

Configuration

Proper Installation

1. Before installation, be sure to remove all protective seals.
2. Before installing the trap, blow out the inlet piping to remove all dirt and oil.
3. 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.
4. 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.
5. When completing the piping, support the pipes properly within 800 mm (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 the condensate discharge pipe leads to a tank or recovery line, or whenever the condensate collection pipeline is connected with more than one trap.

Maximum Allowable Inclination:

Piping Arrangement

Check to make sure that the pipes connected to the trap have been installed properly. Ensure the pipe diameter is suitable, sufficient space has been secured for maintenance, and maintenance valves have been installed at the inlet and outlet.

Requirement	Correct	Incorrect
Install a catchpot of the proper diameter.	-	Diameter is too small.
Make sure the flow of condensate is not obstructed.		Diameter is too small and inlet protrudes into pipe.
To prevent rust and scale from flowing into the trap, connect the inlet pipe 25 - 50 mm (1 - 2 in) above the base of the T - pipe.	-	Rust and scale flow into the trap with the condensate.
When installing on the blind end, make sure nothing obstructs the flow of condensate.		Condensate collects in the pipe.

Operational Check

A visual inspection can be carried out to aid in determining the necessity for immediate maintenance or repair, if the trap is open to atmosphere.

Status	Description
Normal	Condensate is discharged continuously with flash steam and the sound of flow can be heard. If there is very little condensate, there is almost no sound of flow.
Blocked	No condensate is discharged. The trap is quiet and makes no noise, and the surface temperature of the trap 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 the condensate and there is a high-pitched sound.

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 temperature drop in the equipment, poor product quality or losses due to steam leakage.

Parts Inspection Procedure:

• Body, Cover(s): Check inside for damage, dirt, grease, oil film, rust or scale
• Gaskets: Check for warping or damage
• X-element: Check for damage
• Screen(s): Check for clogging, corrosion or damage
• Float: Check for deformation, damage, oil film or water inside
• Air Vent Valve Seat, Orifice: Check for rust, scale, oil film, wear or damage

INFO

Before attempting to open the trap, close the inlet and outlet isolation valves and wait until the trap has cooled completely. Failure to do so may result in burns.

Troubleshooting

If the expected performance is unachievable after installation of the steam trap, check the following points for appropriate corrective measures.

Problem	Cause	Remedy
No condensate is discharged (blocked) or discharge is poor	Float is damaged or filled with condensate	Replace the float
	Orifice, screen or piping is clogged with rust or scale	Clean
	The trap operating pressure exceeds the maximum specified pressure, or there is insufficient pressure differential	Compare specifications and actual operating conditions
	Steam-locking has occurred	Blow down through the bypass or close the trap inlet valve and allow the trap to cool
Steam is discharged or leaks from the trap outlet (blowing)	Orifice is clogged, or rust and scale have accumulated under the float	Clean
	Float is deformed or coated with scale	Clean or replace the float
	Trap is installed above the maximum allowable inclination angle	Correct the installation

Integral Plate-type Bimetal Air Vent Unit Option

The SJH7NB and SJH7VB models feature an integral plate-type bimetal air vent unit. The installation and maintenance of the product is largely identical to the standard types, but includes specific bimetal components.

SJH7NB Configuration:

SJH7VB Configuration:

Tightening Torques for Bimetal Unit:

• Element Cover: 140 N·m (Distance Across Flats: 32 mm)
• Air Vent Valve Seat: 35 N·m (Distance Across Flats: 19 mm)