Double acting NBR energised Bronze filled PTFE piston seal for one piece pistons.

- Design -

Claron D-Ring Seals are designed as high pressure, low friction Double-acting piston seals for use in heavy duty hydraulic cylinders.
The seals high pressure resistance makes it suitable for use in heavy duty applications where shock loads and pressure spikes occur, as found in mobile plant equipment.
The inclusion of radial grooves on the P.T.F.E. element allows rapid response to bi-directional pressure changes.

- Materials -

Standard materials are Bronze Filled P.T.F.E. Outer Ring with a Nitrile O-Ring Energiser but both the outer sealing element and the energiser are available in a wide range of high performance materials to suit a variety of applications.
The application parameters should be carefully considered prior to selecting suitable materials from the tables.
Consult Claron for further advice.

- Operating Range -

Temp. -54°C to 200°C Dependent upon O-Ring Material used
Pressure upto 800 bar
Velocity upto 15m/s
These range parameters are maximum conditional values.
Optimum service conditions are affected by temperature, speed pressure, surface finish and extrusion gaps. Refer to Seal selection Guide for further information.

- Operating Conditions -

Maximum Pressure

Temp. Range
Temp. Range
-30°C to 80°C
80°C to 120°C
400 Bar
350 Bar
These range perameters are Maximum simultaneous conditions.
Optimum service conditions are affected by temperature, speed, pressure, surface finish and extrusion gaps.

Diametral Clearance F shown in the graph is calculated as the maximum permissible extrusion gap, allowing for movement due to side load, for various pressures and temperatures up to 80°C.
The use of a suitably selected Claron bearing ring will effectively reduce the Radial clearance to a value nearer to F/2 thus increasing the pressure capability of the seal.
The maximum seal extrusion gap should be calculated allowing for all tolerances, movement and cylinder expansion.
For pressures > 400 bar, the seal extrusion gap should be reduced by utilising smaller tolerances.
e.g H8 for Cylinder bore, f8 for piston diameter and P.T.F.E tape seating diameter.

- Range of Installation Dimensions -

The full range of diameters applicable to the "Standard", "Light" Duty Sections are shown in the table below

- How to Order -

When ordering, prefix the size reference with the style required and use the suffix shown in the material application tables.
e.g. D-Ring Standard section in Bronze filled material for 70mm diameter D0700/B
D-Ring Light duty section in Glass filled material for 70 mm diameter D0700/1G
For O-Ring energiser materials other than Nitrile, use suffix shown in material table.
e.g Flourocarbon material (FKM), D0700/B/FKM.

- Housing -

For surface finish and recommended lead in chamfers refer the illustration below. For housing dimensions and machining tolerances refer to the table of recommended sizes and Tolerance Tables for value of tolerence symbols

- Fitting -

For the seal to function correctly, it is important that care be taken in fitting the seal within its housing. For details refer to Seal Installation.

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