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CORROSION PROTECTION LOW TEMPERATURE

It is the constant contact with salt water and salty atmospheres which requires the use of For extreme applications in cold environments, there are valves in two low temperature
components with enhanced corrosion protection. executions. They distinguish themselves in particular through the materials used that
The ranges of the materials used allow appropriate anti-corrosion protection of the have to resist high pressures and loads even at temperatures of down to -60° C.
external parts of the valve.

CRUDE STEELS USED
K8: 500 -1000 H SALT SPRAY TEST The steels used in the valves were selected for use also in
All external elements on the valve which are in contact with 3 1 1 cold ambient temperatures. In the extreme range between
-60 °C to -40 °C particularly cold resistant steels are used for
the environment are surface-treated with a zinc-nickel coating the most stressed valve parts, to take account of the extreme
or are made of stainless materials. Control knobs and partially additional loads.
knurled nuts are made of plastic.
K8 will increasingly become the normal standard in the future.
Only the valve flange bodies are painted and the screws zinc
coated.

1 5 1 1

K9: > 1000 H SALT SPRAY TEST
All external elements, apart from the solenoids, are made of 3 1 1
stainless materials. Stainless, acid-resistant AISI 316L high-
grade steels are used if feasable. The solenoids are zinc-nickel SPECIAL SEALS
coated.
For low operating temperatures, special sealing materials are
used that guarantee a stable and secure long-term operation
with a high level of availability, due to their low-temperature
flexibility. Depending on the needs, the materials required for
temperature ranges down to -40 °C and down to -60 °C are
distinguished.
1 4 2 2

K10: > 1000 H SALT SPRAY TEST
All extermal elements are made of stainless materials or 3 2 1
coated with stainless materials. Stainless, acid-resistant AISI
316L high-grade steels are used if feasable.

LOW TEMPERATURE EXECUTIONS

2 4 2 2 Specification Steel O-ring Fit
Z604 (-40 °C) – x (x)

Pos Corrosion protection Z591 (-60 °C) x x x
1 Zinc-nickel coated
– no adaptation required
2 Stainless steel AISI 316L (x) partial adaptation necessary
x adaptation absolutely necessary
3 Nickel coated brass
* The salt spray test exposes the valve to a salt spray with a 4 Stainless steel screws
five percent NaCl solution in accordance with ISO 9227. The Zinc coated screws
number of hours it takes for red rust to appear is measured. 5

WANDFLUH MOBILE | PRODUCTS | LOW TEMPERATURE | PAGE 15