10 m-radialdiaphragmvalve-en-02
6 Diaphragm selection
Diaphragm materials must be selected with consideration to heat-resistance, chemical-
resistance, steam-resistance, durability and handling as well as the number, temperature
and duration of CIP/SIP cycles. It is critical that you select the appropriate diaphragm
materials for your process. For material specifications and further information or assistance
with material selection, visit www.wmftg.com or contact your local sales office.
Ensure the chemicals to be used with valve assembly are compatible
with the valve body, actuator, diaphragm, to be used in the fluid path.
If you need assistance please contact your local sales office.
Examine the diaphragm at least once a week for signs of wear. If you have any concerns
with the condition of the diaphragm, contact your local sales office.
Diaphragm replacement
It is best practice to replace a diaphragm:
• At least annually - For fewer than five SIP cycles a week that are less than two hours
each at less than 135C
• At least every six months - For five or more SIP cycles a week that are less than
two hours each at less than 135C.
The following table summarises the availability of each diaphragm material for the
different valve sizes.
Material
Valve Size Availability
0.5" 1" 1.5" 2" 3" 4"
Silicone
u u u u u u
Silicone Plus
u u u u u
n/a
EPDM
u u u u u u
EPDM Plus
u u u u u
n/a
Viton A
u u
n/a
u
n/a n/a
Viton A
(steam resistant)
u u u u u
n/a
Viton GF n/a
u
n/a
u u
n/a
PTFE n/a
u u u u
n/a
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