The TLV SJ7FNX and SJ7FVX are ductile cast iron free float steam traps with three-point seating and thermostatic air venting (X-element). They are reliable and durable steam traps with tight shut-off, designed for use on medium-size process equipment such as heat exchangers, tank heaters, dryers, and process equipment. The SJ7FNX is designed for horizontal piping installation, while the SJ7FVX is designed for vertical piping installation.

These inline repairable traps discharge condensate continuously and automatically at a temperature slightly lower than saturation temperature. The self-modulating free float provides continuous, smooth, low-velocity condensate discharge as process loads vary. A precision-ground float, constant water seal, and three-point seating design ensure a steam-tight seal, even under no-load conditions. The thermostatic capsule (X-element) with a "fail open" feature vents air automatically until close-to-steam temperature. A built-in screen with a large surface area ensures extended trouble-free operation, and easy inline access to internal parts simplifies cleaning and reduces maintenance costs.

Specifications

Model	SJ7FNX	SJ7FVX
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)	2, 5, 9, 14, 22 barg	2, 5, 9, 14, 22 barg
Maximum Differential Pressure (ΔPMX)	2, 5, 9, 14, 22 bar	2, 5, 9, 14, 22 bar
Maximum Operating Temperature (TMO)	220 °C	220 °C
Subcooling of X-element Fill	up to 6 °C	up to 6 °C
Type of X-element	C6	C6

WARNING

PRESSURE SHELL DESIGN CONDITIONS (NOT OPERATING CONDITIONS):

• Maximum Allowable Pressure (PMA): 22 barg
• Maximum Allowable Temperature (TMA): 220 °C
• Minimum Allowable Temperature: 0 °C

To avoid abnormal operation, accidents or serious injury, DO NOT use this product outside of 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	Cover Gasket	Fluorine Resin PTFE	PTFE	PTFE
4	Float	Stainless Steel SUS316L	1.4404	AISI 316L
5	Orifice	-	-	-
6	Orifice Gasket	Fluorine Resin PTFE	PTFE	PTFE
7	X-element Screen	Stainless Steel SUS304	1.4301	AISI 304
8	Screen	Stainless Steel SUS430	1.4016	AISI 430
9	Screen Holder	Cast Stainless Steel A351 Gr.CF8	1.4312	-
10	Screen Holder Gasket	Soft Iron SUYP	1.1121	AISI 1010
11	Orifice Plug (SJ7FNX)	Cast Stainless Steel A351 Gr.CF8	1.4312	-
12	Orifice Plug Gasket (SJ7FNX)	Soft Iron SUYP	1.1121	AISI 1010
13	Drain Plug	Carbon Steel SS400	1.0037	A6
14	X-element	Stainless Steel	-	-
15	X-element Guide	Stainless Steel SUS304	1.4301	AISI 304
16	X-element Cover	Cast Stainless Steel A351 Gr.CF8	1.4312	-
17	Air Vent Valve Seat	Stainless Steel SUS420F	1.4028	AISI 420F
18	Cover Bolt	Carbon Steel S45C	1.0503	AISI 1045
19	Spring Clip	Stainless Steel SUS304	1.4301	AISI 304
20	X-element Cover Gasket	Fluorine Resin PTFE	PTFE	PTFE
21	Nameplate	Stainless Steel SUS304	1.4301	AISI 304

Dimensions

SJ7FNX Flanged (Horizontal)

DN	L (DIN 2501 PN25/40)	H1	W	B	Weight (kg)
40	230 mm	312 mm	346 mm	205 mm	26
50	230 mm	312 mm	346 mm	205 mm	28

SJ7FVX Flanged (Vertical)

DN	L (DIN 2501 PN25/40)	W1	B	Weight (kg)
40	230 mm	304 mm	205 mm	22
50	230 mm	304 mm	205 mm	23

Discharge Capacity

INFO

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. Capacities are based on continuous discharge of condensate 6 °C below saturated steam temperature.
4. Recommended safety factor: at least 1.5.

WARNING

DO NOT use this product under conditions that exceed maximum differential pressure, as condensate backup will occur!

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

Requirement	Correct	Incorrect
Install a catchpot with the proper diameter.	Diameter is adequate.	Diameter is too small.
Make sure the flow of condensate is not obstructed.	Flow is clear.	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.	Connected above base.	Rust and scale flow into the trap with the condensate.
When installing on the blind end, make sure nothing obstructs the flow of condensate.	Flow is clear.	Condensate collects in the 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.

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
X-element	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
X-element Cover	140	32
Air Vent Valve Seat	35	19
Orifice Plug	400	50

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
	X-element is damaged	Replace the X-element
	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	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 X-element is damaged, or clogged with rust or scale	Clean or replace the X-element
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

Option (Integral Plate-type Bimetal Air Vent Unit)

Models SJ7FNB and SJ7FVB feature an integral plate-type bimetal air vent unit.

Disassembly/Reassembly of the Bimetal Section

Part	Disassembly	Reassembly
Element Cover	Remove with a socket wrench	Consult the table of tightening torques and tighten to the proper torque
Element Cover Gasket	Remove the gasket and clean sealing surfaces	Replace with a new gasket
Spring Clip	Pinch the insides together and remove from the element guide	Insert it securely into the groove
Bimetal Unit	-	Insert the bimetal unit into the element guide with "T" mark on the bimetal facing towards the air vent valve seat.
Air Vent Valve Seat (for Bimetal)	Remove with a socket wrench	Consult the table of tightening torques and tighten to the proper torque

Table of Tightening Torques (Bimetal Unit)

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