Max. material inlet pressure PWork :
The allowed working pressure has to be lower than this value. PWork can appear dynamic. This dynamic pressure can be more than PWork temporary (range of minutes). The allowed overstepping is between10 – 20 %. It should be noted that for special products additional recommended pressure descriptions are necessary.
Maximum pressure PMax :
This pressure must not occur dynamically. PWork can occur at DOPAG machines, when the outlet valve closes abruptly and the pump still works. Therefore this pressure has to be relieved during longer waiting times.
Mechanical resistance :
Property |
Definition |
|
No specific resistance |
Application for unfilled or non-abrasive media. |
|
Increased resistance |
Application for slightly abrasive media. Parts are made of hardened materials. |
|
Wear resistant |
Application for abrasive media. Parts are made of hard metal or have coated surfaces. |
Chemical resistance metals :
Property |
Definition |
|
No specific resistance |
Application for non-aggressive or non-acidic media (pH value 5-9). Parts of the valve are made of aluminum or steel. |
|
Increased resistance |
Application for aggressive media (pH value 4-10). Parts of the valve are made of A2 grade stainless steel. |
|
Stainless |
Application for aggressive media (pH value 0-14). Parts of the valve are made of stainless steel in A4 quality. |
Chemical resistance non-metals :
Property |
Definition |
|
No specific resistance |
Application for non-aggressive or non-acidic media (pH value 5-9). Parts are made of e.g. FPM, NBR. |
|
Increased resistance |
Application for aggressive media (pH value 3-12). Parts are e.g. made of Turcon, Zurcon. |
|
High resistance |
Application for aggressive media (pH value 0-14). Parts are e.g. made of PTFE, FFPM. |
|
EPDM |
Application for aggressive media (pH value 5-14), greases and mineral oils excluded. |