Type 2961

15 | 17

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Operating limits for seat seal

Tight sealing required

Leakage class

(DIN EN 60534 - 4)

Medium temperature

Seat seal

No

An additional shut-off valve is

recommended

III/IV (metal seals)

Metal-sealed valves have larger

leakages (0.1 % or 0.01 % of

the nominal flow rate are

permissible).

Metallic seals are impervious

even under demanding process

conditions.

- 40…+ 230 °C

Stainless steel

Yes

An additional shut-off valve is

often unnecessary.

VI (soft seals)

By using plastics as sealing

material, the control valves can

close tightly.

Their use is not recommended in

cases of increased erosion

due to demanding process

conditions.

- 40…+ 130 °C

(recommended for ≤ + 130 °C)

PTFE

- 10…+ 230 °C

(recommended for > + 130 °C)

PEEK

Operating limits for optional versions

High-temperature version

Thanks to an adaption of the spindle seal, this version is suitable for applications with steam, neutral gases and other heat transfer

mediums up to + 230 °C.

Water version

For applications with water up to + 200 °C, a special configuration of the spindle seal increases service life significantly. It is recommended

for water temperatures starting at + 85 °C.

Drinking water version

Wetted materials are tested in contact with the medium are tested for suitability with drinking water up to + 85 °C.

Low-temperature version

Suitable for minimum medium temperatures down to - 40 °C