BECA 740 - 749

Static seals

BECA 740 - 749

Description

The BECA 740 is a symmetrical dynamic and static facial effect U-seal, made from PTFE (different filling options) with lips that are pre-stressed by a V-Shaped spring.

Derived from the BECA 740 profile, the BECA 749 profile is made specially for food industry applications. The V-Shaped spring is replaced with a VMQ O'Ring.

Advantages

Wide temperature range and excellent chemical resistance
Low friction coefficient; no stick-slip effect
Excellent abrasion resistance
Good dimensional stability
Non-toxic material

Technical data

Temperature	-200°C/+260°C
Pressure	30 MPa
Speed	15 m/s
Medias	Mineral hydraulic oils Fire-resistant liquids Biocompatible fluids Water Others (contact our experts)

Applications

Food & Beverage
Medical
Pharmaceutical
Static hydraulics

Materials

Profiled seal

Bronze-filled PTFE
Carbon-filled PTFE

V-Shaped spring

Stainless steel

Download

Product data - Static seal - BECA 740 -749 Product catalog - Static seals

Dimensions

Installation dimensions

Materials

Technical data

Dimensions

Installation drawing Logement Gorge Joint facial interne - Housing Groove Internal facial seal - BECA 740 - 749

Installation dimensions

Housing Groove Internal Face Seal - BECA 740 - 749

Installation dimensions - Standard series

Series	Groove outside diameter ØD1 H10		Groove width	Groove depth
Series	Standard series	Extended series	L4 0/+0.15	h	Tol.
740.0*	12.0 - 34.9	12.0 - 200.0	2.40	1.45	+0.03
740.1	35.0 - 54.9	35.0 - 200.0	3.60	2.25	+0.05
740.2	35.0 - 54.9	35.0 - 400.0	4.80	3.10	+0.08
740.3	55.0 - 99.9	55.0 - 600.0	7.10	4.70	+0.10
740.4	100.0 - 599.9	100.0 - 600.0	9.50	6.10	+0.15

*Only BECA 740.0 profiles are fitted with an O'Ring instead of a V-Shaped spring.

Installation dimensions - Additional range

Series	Groove outside diameter ØD1 H10	Groove width L4 0/+0.15	Groove depth
Series	Groove outside diameter ØD1 H10	Groove width L4 0/+0.15	h	Tol.
740.235	35.0 - 200.0	5.00	3.50	+0.08
740.240	35.0 - 200.0	5.00	4.00	+0.08
740.245	35.0 - 200.0	5.50	4.50	+0.08
740.350	55.0 - 200.0	5.50	5.00	+0.10
740.355	55.0 - 400.0	7.50	5.50	+0.10
740.460	100.0 - 400.0	8.00	6.00	+0.15
740.465	100.0 - 400.0	8.50	6.50	+0.15
740.470	100.0 - 400.0	8.50	7.00	+0.15
740.475	100.0 - 400.0	9.00	7.50	+0.15
740.480	100.0 - 600.0	11.00	8.00	+0.20
740.485	100.0 - 600.0	11.00	8.50	+0.20
740.490	100.0 - 600.0	11.00	9.00	+0.20
740.495	100.0 - 600.0	12.00	9.50	+0.20
740.4100	100.0 - 600.0	12.00	10.00	+0.25

Materials

Profiled seal					V-Shaped spring			Contact surface area
Standard code	ISO code	Material	Colour	Characteristics	Code	Type of material	Service temperature	Contact surface area
DP	P	Virgin PTFE	White	Resistance to chemical products Sealing water Dielectric Non-stick Low friction coefficient Food & Beverage	I	X10 Cr Ni 18-8	-200°C/+260°C	Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface



DC	C	PTFE +25% Carbon	Grey	Improvement Wear properties Compression set Good resistance to chemical products Thermal and electrical conductivity Anti-static Efficient as part of dynamic applications with compression


CG	C	PTFE + 23% Carbon + 2% Graphite	Black


DV	V	PTFE + 25 % Glass	Blue	Improvement Wear properties Mechanical strength Slightly more abrasive but can be corrected with the addition of MOS2 Chemical and dielectric properties preserved Well suited to applications with rotating and simultaneous alternating movements				Steel Chrome steel Cast iron
DV	V	PTFE + 25 % Glass	Blue
VM	M	PTFE + 15 % Glass + 5% MoS2	Grey
VM	M	PTFE + 15 % Glass + 5% MoS2	Grey
DX	X	GL Blue PTFE + Glass + Metal oxides	Turquoise blue	Compression resistant Wear resistant Excellent chemical stability Good thermal conductivity
DX	X	GL Blue PTFE + Glass + Metal oxides	Turquoise blue
DG	G	PTFE + 15% Graphite	Black	Improvement Wear properties Reduced wear on metal parts Self-lubricating Thermal and electrical conductivity Low permeability Good friction coefficient Anti-static Efficient as part of dynamic dynamic applications with self-lubrication				Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface


K1	K	PTFE + 10% Ekonol	Light brown	Improvement Better abrasion resistance Better dimensional stability at high temperatures Use up to +300°C Good friction coefficient and low permeability


K2	K	PTFE + 20% Ekonol	Light brown


DB	B	PTFE + 60% Bronze	Dark brown	Improvement Wear properties Deformation and creep resistance Compression resistant Self-lubricating Electrical and thermal conductivity Does not alter metal parts Reduced resistance to certain chemical products Used for dynamic seals with a strong compression and low level of wear				Steel Chrome steel Cast iron
DB	B	PTFE + 60% Bronze	Dark brown
B4	B	PTFE + 40% Bronze	Dark brown
B4	B	PTFE + 40% Bronze	Dark brown
HG	HG	PE-UHMW	White or off-white	Excellent wear resistance on contact with water and air	I	X10 Cr Ni 18-8	-70°C/+80°C	Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface

Other grades of materials are available depending on your specificities.

Technical data

Housing Groove Internal Face Seal - BECA 740 - 749

Surface roughness

Roughness	Hydrogen, helium, cryogenic gas, refrigerants	Low viscosity fluids (water, alcohols, natural gases, air)	High viscosity fluids (gear oils, dairy products, adhesives)
Ra	≤ 0.3 µm	≤ 0.6 µm	≤ 0.8 µm
Rz	≤ 2.2 µm	≤ 3.5 µm	≤ 5.0 µm
Rmax	≤ 3.5 µm	≤ 5.0 µm	≤ 6.5 µm

Radius

Groove depth h	Radius R1
1.45	0.40
2.25	0.40
3.10	0.60
4.70	0.80
6.10	0.80
9.50	0.80

Only on request