V-rings
PTFE V-rings are used mainly for sealing on plunger and piston rods of hydraulic cylinders, presses, valve spindles and controls. Several sealing lips and the long contact surfaces ensure a good sealing performance.
The seal sets consist of a pressure ring, a back-up ring and V-rings, which in number and design are adapted to the various operational conditions. This makes them more insensitive to contamination from the operating medium than one-piece seals. Further decisive advantages are their form stability, which make V-rings insensitive to pressure peaks, and their preload adjustability (spacer plates, springs). In addition, they have a favorable breakaway torque even after a long standstill period.
Standard profiles are manufactured from pure PTFE or PTFE with fillers. There is an elastic design for the low pressure range, a design is available for a broad product spectrum, where the sealing function is given due to a wedge effect and a pressure resistant, relatively rigid design for harsh operating conditions. V-seal sets are made by machining and can be produced in a variety of diameters and heights.
Medium pressure V-seal set (MDM)
– Pressure range: < 50 bar
– Elastic profile version
High pressure V-seal set (HDM)
– Pressure range: 50 to 100 bar
– Profile relatively rigid, seals through a wedge effect
Extreme pressure V-seal set (HöDM)
– Pressure range100 bar – 250 bar
– Preferable for static sealing functions and pulsating pressures
Materials
| PTFE pure | low friction coefficient, low gas permeability, low thermal conductivity, limited abrasion resistance, application in food environments |
| PTFE + glass fiber | high pressure resistance, improved wear resistance, not alkaline-resistant, application especially in food environments |
| PTFE + carbon | good pressure resistance, improved thermal conductivity, good wear resistance, particularly suited for water as medium, filler can be attacked by oxidizing media |
| PTFE + graphite | good gliding and lubricating properties, conserves counter-running surfaces, is particularly suited for soft counter-running surfaces, very good in steam operations, not suitable for hard metals, filler can be attacked by oxidizing media |
| PTFE + bronze | high pressure resistance, good thermal conductivity, good running behavior, filler can be attacked by acids |
Surface finish
Running surface hardness
Application limits
Pressure: up to 300 bar
Stroke speed: Continuous operation: 0.5 m/s, intermittent operation 1.2 m/s
Temperature: -200°C to +240°C
| Roughness depth | Ra |
| Dynamic sealing surfaces | ≤ 0,2 µm |
| Static sealing surfaces | ≤ 1,6 µm |
| Lead-in chamfers, groove flanks | ≤ 3,2 µm |
| PTFE pure (CCN-01) | ≥ 30 HRC |
| PTFE compounds | ≥ 50 HRC |
Product data sheet (PDF)
Our data sheet for V-seals can be found here.
Overview of materials for dynamic seals (PDF)
The following overview is a selection of typical PTFE materials used for seals, guide elements and wipers. Further PTFE materials are available for special applications.
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