Helical - Eclipse Engineering, Inc.

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Eclipse EHF – Helical Spring External Face Seal

Face Seals are typically used in static sealing applications. External Face Seals are often used to keep environmental media out of an exposed joint, hinge point, or pipe fitting . A PTFE Face Seal offers advantages over traditional O-Rings in terms of pressure handling, chemical compatibility, and operating temperature range. Use in cyrogenic applications is common.

Typical Range of Application
Pressure	Temperature	Values and ratings in this catalog are based on industry standard applications operating under ideal conditions. The customer should assume responsiblity for validation testing of performance and suitabilty of Eclipse Engineering products. Eclipse Engineering accepts no liabilty for the accuracy and applicabilty of provided information.
Vacuum to 3,000 psi [0 to 200 bar]	-320°F to 450°F [-195°C to 230°C]

Ratings will vary based on materials and operating conditions

Standard Ordering example:
	EHF-E-234-ET006-H-P

H		= Spring Load
		H – Heavy

P		= Spring Material
		S – 17-7 PH Stainless Steel E – Elgiloy® H – Hastelloy®

Non-Standard Ordering example:
	EHF-E-C-02953-ET006-H-P

= Nominal Cross-Section

A = 1/16 in. (000 Series)

B = 3/32 in. (100 Series)

C = 1/8 in. (200 Series)

D = 3/16 in. (300 Series)

E = 1/4 in. (400 Series)

02953		= Seal ID in 1000ths
		Example: 02953 = Ø2.953 [75MM] Seal Inside Diameter

EHF Standard Seal Materials

Eclipse Material Code	Description	Color	Applications
ET000	Virgin PTFE	White	Light Duty / Static / Cryogenics
ET006	Carbon filled PTFE	Black	General Purpose
EU000	Virgin UHMWPE	Translucent White	Viscous Media / Water
ET014	Polyimide filled PTFE	Orange/Brown	High Sealabilty / Soft Hardware

See Eclipse Material Guide for complete list of available materials.

EHF Standard Spring Materials

Eclipse Material Code	Spring Material	Application
P	17-7 PH Stainless Steel	General purpose, standard spring material
E	Elgiloy®	Improved performance and corrosion resistance; NACE approved
H	Hastelloy® C276	Maximum chemical/corrosion resistance

000 Series Standard Dash Numbers

000 Series Maximum Extrusion Gap (E), at 70° F
300 psi	1500 psi	3000 psi	6000 psi
0.008	0.004	0.003	0.002