DanaStep secondary seal R29

The DanaStep secondary seal is designed with the well-known profile that enables the seal to draw liquid back into the system. With two Dana Steps in tandem combined with a double wiper, there is zero leakage in almost any application. The radius of the rear of the seal secures optimal form stability.

A combination with DanaFlon compounds with maximum form stability provides the best possible safety. The DanaFlon materials are chemically resistant to all hydraulic media and the O-ring material can be chosen so that the seal is unaffected by the media.

Extreme chemical resistance

Advantages:

High dynamic and static sealing effect
High extrusion resistance
Low friction
No stick-slip
Small groove
High operational stability
Suitable for a wide variety of media

APPLICATION EXAMPLES

Working conditions:

Pressure: 25 Mpa
Temperature: NBR O-ring: -30 to +100, FPM O-ring: -10 to +200
Application: High pressure, Intensive movement
Speed: 15 m/s
Standard: ISO 7425-2
Diameter range: 3 to *3000 mm
Action: Single-acting

Frequently used - DanaFlon Material

Intensive movement - High pressure	–60 to +60 °C 60 Shore D
Basis material	Polyurethane
DanaFlon	84
Filler	Virgin
Colour	Red
Extreme form stability and extrusion resistance	(yes)
Lubricating media	yes
Extreme wear resistance	(yes)
Wide range of media	yes
Non-lubricating media	yes
Food applications	no
Conforms to food regulation	no

Alternative solution - DanaFlon Material

Intensive movement - High pressure	–200 to +260 °C	–200 to +260 °C	–200 to +260 °C
Basis material	PTFE	PTFE TFM	PTFE
DanaFlon	24	45	32
Filler	Bronze & Additives	Carbon fibre	Carbon & Graphite
Colour	Brownish	Dark Gray	Dark Black
Extreme form stability and extrusion resistance	yes	yes	(yes)
Lubricating media	yes	yes	yes
Extreme wear resistance	(yes)	(yes)	(yes)
Wide range of media	no	yes	yes
Non-lubricating media	no	yes	yes
Food applications	no	no	no
Conforms to food regulation	no	no	no

O-rings may limit the temperature range and need to be compatible with the media.

The performance of the seal will always depend on the overall picture of the working conditions.

Verification can only be done by testing the seal in the actual working conditions.

DanaStep secondary seal R29

Technical details

Here you can see the technical details

* Recommended finish for dynamic sealing surface

Ra max (0.2 μm)
Rz max (1.25 μm)
Rp max (0.63 μm)
Tp = 50 - 70% at depth of p= 0.25 Rz

Series		Rod øB f8/h9			øA H9	G ^{+ 0,2}_{- 0}	R	Max radial clearance				O-Ring
Series		Heavy	Standard	Light	øA H9	G ^{+ 0,2}_{- 0}	R	16 MPa	26 MPa	32 MPa	40 Mpa	Serie	Cross sect.
R29	00	-	3 - 7,9	8 - 18,9	øB + 4,9	2,2	0,3 - 0,5	0,35	0,30	-	-	000	1,78
	01	-	8 - 18,9	19 - 37,9	øB + 7,3	3,2	0,5 - 0,8	0,40	0,35	-	-	100	2,62
	02	8 - 18,9	19 - 37,9	38 - 199,9	øB + 10,7	4,2	0,8 - 1,2	0,50	0,40	0,30	-	200	3,53
	03	19 - 37,9	38 - 199,9	200 - 255,9	øB + 15,1	6,3	1,2 - 1,5	0,55	0,45	0,35	0,30	300	5,33
	04	38 - 199,9	200 - 255,9	256 - 649,9	øB + 20,5	8,1	1,5 - 2,0	0,60	0,50	0,40	0,40	400	7,00
	05	200 - 255,9	256 - 649,9	650 - 999,9	øB + 24,0	8,1	1,5 - 2,0	0,70	0,60	0,55	0,50	400	7,00
	06	256 - 649,9	650 - 999,9	-	øB + 27,3	9,5	2,0 - 3,0	0,75	0,65	0,60	0,55	-	8,40

Max radial clearance is based on DanaFlon 24 and 100 °C
For other hi-filled Danaflon compounds the clearance should be reduced with 10%
Clearance: At Pressure > 40 MPa use diameter tolerance H7/f7 (Bore/Rod)

Part No. example

DanaStep for 30 mm rod

Delivery times

For special requests, please complete our Request form or call us on +45 4922 4400.

DanaStep secondary seal R29

Technical details

Head Office

Products

useful