TFO Series L-ring Face Seal Fittings

Features

• Reduced internal entrapment
• Lubricant-free L-ring seal
• Controlled L-ring extrusion to prevent over-tightening
• Butt weld connection to ensure the system unhindered
• Standard surface roughness finished to an average of Ra 20 μin. (0.51 μm)
• Each fitting marked with size, material and heat number

Technical Data

• Sizes range from 1/4″ to 1″
• Materials:

Material	Bar Stock	Designator
316 SS 316L SS	ASTM A276, ASME SA479	SS 6L

Working Pressure

Tube OD.	Working Pressure psig (bar)
1/4 in.	2500 (172)
1/2 in.	2000 (137)
3/4 in.	1500 (103)
1 in.	1500 (103)
12 mm	2000 (137)

Working Temperature:

Temperature ranges for TFO fittings are restricted by the L-ring materials.

Material	Designator	Working Temperature
PTFE	T	– 50°F to 450°F (- 45°C to 232°C)

Testing: Every TFO fitting is Helium leak tested to a maximum allowable leak rate of
4×10−⁹ std cm³/s

Installation Instructions

1. Assemble the gland, nut and gasket as below. Finger tight the nut
2. Tighten the nut 1/8 turn with a wrench while holding the fitting body steady

Cautions

• Dimensions are for reference only and are subject to change.
• Inspect the O-ring each time the groove housing is dismantled.
• Before welding the body , the L-ring should be removed to prevent possible damages.
• Tungsten Inert Gas Welding (TIG) is recommended.
• Do not loosen or tighten fittings when system is pressurised.

For more information on TFO Series L-ring Face Seal Fittings please contact our sales team: sales@nvfcl.com or call 01942601209.