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

ptfe dynamische dichtungen dachmanschetten.

Materials

PTFE purelow friction coefficient, low gas permeability, low thermal conductivity, limited abrasion resistance, application in food environments
PTFE + glass fiberhigh pressure resistance, improved wear resistance, not alkaline-resistant, application especially in food environments
PTFE + carbongood pressure resistance, improved thermal conductivity, good wear resistance, particularly suited for water as medium, filler can be attacked by oxidizing media
PTFE + graphitegood 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 + bronzehigh pressure resistance, good thermal conductivity, good running behavior, filler can be attacked by acids

Surface finish

Roughness depthRa
Dynamic sealing surfaces≤ 0,2 µm
Static sealing surfaces≤ 1,6 µm
Lead-in chamfers, groove flanks≤ 3,2 µm

Running surface hardness

PTFE pure (CCN-01)≥ 30 HRC
PTFE compounds≥ 50 HRC

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

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