TLV SJ7FNB and SJ7FVB are reliable and durable free float steam traps with tight shut-off for use on medium-size process equipment. Models are available for horizontal (SJ7FNB) or vertical (SJ7FVB) piping installation.

Features

• Self-modulating free float provides continuous, smooth, low velocity condensate discharge as process loads vary.
• Precision-ground float, constant water seal and three-point seating design ensure a steam-tight seal, even under no-load conditions.
• Thermostatic bimetal air vent valve vents air automatically for rapid startup.
• 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	SJ7FNB	SJ7FVB
Installation	Horizontal	Vertical
Connection	Flanged	Flanged
Size	DN 40, 50	DN 40, 50
Orifice No.	2, 5, 9, 14, 22	2, 5, 9, 14, 22
Maximum Operating Pressure (PMO)	22 barg	22 barg
Maximum Differential Pressure (ΔPMX)	22 bar	22 bar
Maximum Operating Temperature (TMO)	220 °C	220 °C

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.

Materials

No.	Description	Material	DIN	ASTM/AISI
1	Body	Ductile Cast Iron GGG40.3 / EN 5.3103	0.7043	A395 Gr.60-40-18
2	Cover	Ductile Cast Iron GGG40.3 / EN 5.3103	0.7043	A395 Gr.60-40-18
3	Float	Stainless Steel SUS316L	1.4404	AISI 316L
4	Orifice	-	-	-
5	Orifice Gasket	Fluorine Resin PTFE	PTFE	PTFE
6	Screen	Stainless Steel SUS304	1.4301	AISI 304
7	Element Cover Gasket	Fluorine Resin PTFE	PTFE	PTFE
8	Cover Gasket	Fluorine Resin PTFE	PTFE	PTFE
9	Cover Bolt	Carbon Steel S45C	1.0503	AISI 1045
10	Orifice Plug (SJ7FNB)	Cast Stainless Steel A351 Gr.CF8	1.4312	-
11	Element Cover	Cast Stainless Steel A351 Gr.CF8	1.4312	-
12	Screen Holder	Cast Stainless Steel A351 Gr.CF8	1.4312	-
13	Screen Holder Gasket	Soft Iron SUYP	1.1121	AISI 1010
14	Main Screen	Stainless Steel SUS430	1.4016	AISI 430
15	Nameplate	Stainless Steel SUS304	1.4301	AISI 304
16	Plug	Carbon Steel SS400	1.0037	A6
17	Element Guide	Stainless Steel SUS304	1.4301	AISI 304
18	Air Vent Valve Seat	-	-	-
19	Bimetal	-	-	-
20	Snap Ring	Stainless Steel SUS304	1.4301	AISI 304
21	Air Vent Valve	-	-	-
22	Snap Ring	Stainless Steel SUS304	1.4301	AISI 304
23	Orifice Plug Gasket (SJ7FNB)	Soft Iron SUYP	1.1121	AISI 1010

Dimensions

SJ7FNB Flanged (Horizontal)

DN	L (DIN 2501 PN25/40)	H1	W	B	Weight (kg)
40	230	315	350	205	26
50	230	315	350	205	28

SJ7FVB Flanged (Vertical)

DN	L (DIN 2501 PN25/40)	W1	B1	Weight (kg)
40	230	305	205	22
50	230	305	205	23

Discharge Capacity

1. Line numbers within the graph are 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 this product under conditions that exceed maximum differential pressure, as condensate backup will occur!

Configuration

SJ7FNB

SJ7FVB

Proper Installation

• Installation, inspection, maintenance, repairs, disassembly, adjustment and valve opening/closing should be carried out only by trained maintenance personnel.
• Take measures to prevent people from coming into direct contact with product outlets.
• Install for use under conditions in which no freeze-up will occur.
• Install for use under conditions in which no water hammer will occur.

1. Before installation, be sure to remove all protective seals.
2. Install the steam trap within the allowable inclination. 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 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 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 more than one trap is connected to the condensate collection pipeline.

Piping Arrangement

Check to make sure that the pipes connected to the trap have been installed properly.

1. Is the pipe diameter suitable?
2. Has the trap been installed within the allowable inclination and with the arrow on the body pointing in the direction of flow?
3. Has sufficient space been secured for maintenance?
4. Have maintenance valves been installed at the inlet and outlet? If the outlet is subject to back pressure, has a check valve been installed?
5. Is the inlet pipe as short as possible, with as few bends as possible, and installed so that the condensate will flow naturally down into the trap?
6. 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.

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.

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.

• 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.
• Be sure to use the proper components and NEVER attempt to modify the product.

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
Bimetal Unit	Check for damage
Screen	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

Tightening Torques and Distance Across Flats

Part	Torque (N·m)	Distance Across Flats (mm)
Cover Bolt	100	24
Orifice	120	30
Screen Holder	400	50
Drain Plug	30	12
Element Cover	140	32
Air Vent Valve Seat	35	19
Orifice Plug	400	50

(Note: 1 N·m ≈ 10 kg·cm)

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.

• 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.

Troubleshooting

Problem	Cause	Remedy
No condensate is discharged 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
	Steam-locking has occurred	Blowdown through the bypass or close the trap inlet valve and allow the trap to cool
	Bimetal unit is damaged	Replace the bimetal unit
	The trap operating pressure exceeds the maximum specified pressure, or there is insufficient pressure differential	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
	Orifice is damaged	Replace the 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 bimetal unit is damaged, or clogged with rust or scale	Clean or replace the bimetal unit
Steam leaks from a place other than the trap outlet	Deterioration of or damage to gaskets	Replace with new gaskets
	Leakage from eroded cavities of body or cover	Replace the trap
	Improper tightening torque for cover was used	Tighten to the proper torque
Float is frequently damaged	Water hammer occurs	Examine the piping for problems that can cause water hammer