Piston seal, single-acting Type KD 01

The single-acting piston seal type KD 01 is primarily used in cylinders with one-sided pressurization. It promises stick-slip free running as well as good dry-running properties. These piston seals are suitable for mineral oil-based hydraulic liquids, environment-friendly bio-oils and water to flame-resistant hydraulic liquids and air.

While the PTFE profile ring seals dynamically against the cylinder surface, the elastic O-ring ensures uniform contact pressure of the PTFE profile ring onto the cylinder surface, and at the same time, a static sealing between profile ring and groove base.

Even with low pressures, the piston seal shows good sealing effect due to the inherent preloading of the PTFE profile ring and the contact force of the preloaded O-ring. At higher system pressures, the medium pressurizes the O-ring causing it to press the PTFE seal with enhanced force against the cylinder surface.

Through the different material combinations, the piston seal can be used reliably across the whole pressure, speed and temperature range.

Application media

Mineral oil-based hydraulic liquids
Water
Air
Environment-friendly bio-oils
Flame-resistant hydraulic liquids
Other media, depending on the O-ring material

Application range

Pressure: up to 40 Mpa (400 bar)
Speed: approx. up to 15 m/s
Temperature: – 30 °C to + +200 °C (depending on the O-ring material)

Surface finish

Roughness depth	Ra	Rt
Running surface	≤ 0,3 µm	≤ 3,0 µm
Groove base	≤ 1,6 µm	≤ 16,0 µm
Groove flank	≤ 1,6 µm	≤ 16,0 µm

Installation dimensions

ø of bore hole DN H9						Gap size S			O-ring
Standard Application	light Application	Heavy application	ø Groove base d1 h9	Groove width L1+0,2	Radius R r₁	10 Mpa max.	20 Mpa max.	40 Mpa max.	line ø d₂
8,0 – 16,9	17,0 – 26,9	–	D_N– 4,9	2,2	0,4	0,3	0,2	0,15	1,78
17,0 – 26,9	27,0 – 59,9	–	D_N – 7,3	3,2	0,6	0,4	0,25	0,15	2,62
27,0 – 59,9	60,0 – 199,9	17,0 – 26,9	D_N – 10,7	4,2	1,0	0,5	0,3	0,2	3,53
60,0 – 199,9	200,0 – 255,9	27,0 – 59,9	D_N – 15,1	6,3	1,3	0,7	0,4	0,25	5,33
200,0 – 255,9	256,0 – 669,9	60,0 – 199,9	D_N – 20,5	8,1	1,8	0,8	0,6	0,35
256,0 – 669,9	670,0 – 999,9	200,0 – 255,9	D_N – 24,0	8,1	1,8	0,9	0,7	0,4	7,0

PTFE profile ring material

For other possible materials see our overview of PTFE materials in the technical information section.

PTFE + bronze

The standard for hydraulic applications, good gliding behavior, particularly pressure and abrasion resistant, cannot be used in aqueous solutions or acids

PTFE + Glas-MoS2

Particularly good resistance to wear and abrasion, application is possible even with poor lubricating pressure fluids, in water and in water-oil emulsions

PTFE + carbon

Exceptional resistance to abrasion and extrusion, can be used in water-hydraulics

O-ring material

Nitrile rubber NBR: Temperature range − 30 °C to + 120 °C

Fluororubber: FPM Temperature range − 25 °C to + 200 °C

Downloads

Materials overview for dynamic seals (PDF)Product data sheet for the Piston seal, single-acting Type KD 01 (PDF)

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