Technical Specifications

Masoneilan Valves ValVue ESD Instruction Manual =| 235
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Figure 246 Load from DB
The Diagnostic Graph appears (Figure 247 on page 235).
3. Determine Friction, Breakout, PST Minimum Pressure From Extended Signature
To do this:
Figure 247 Diagnostic Graph
7. Determine the PST minimum pressure by:
This value depends on the spring range and the valve/actuator hysteresis.
a. Determining where the PST Max travel crosses the closing curve (upper curve) - this is
1.
Locate the X-Axis pressure on the signature Y-Axis for the desired Travel target. For
Upper Curve =
Closing Direction
4
3
1
2