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DANIEL MODEL 788DVC DIGITAL CONTROL VALVES DEC 2012
TM
INSTALLATION AND MAINTENANCE 4-1
4.0 INSTALLATION AND MAINTENANCE
The most common application of the Daniel Model 788DVC Digital Control Valve is for truck
loading of petroleum products. The valve may be used with a variety of flow meter types,
including Coriolis and turbine meters, as shown in Figure 4-1. In this installation the DL8000 is
the primary batch and control device. Reference Figure 4-2 and 4-3 for configuration
information.
Flow must be horizontal or vertical up but never vertical down.
4.1 Recommended Installation Instructions
As with all control valves, it is most important that proper installation be accomplished if the
valve is to operate as designed. Preliminary set-up should include the following steps:
1. Evaluate the metering system in the process line to determine that criteria pertinent to
digital valve control is met.
• Minimum meter K-factor: 20 pulses/unit
• Minimum meter pulse frequency (low flow): 50 Hz
• Minimum opening time (shut-off to full open): 1.5 seconds
• Minimum closing time (full open to shut-off): 1.5 seconds
2. Reference engineering drawings for proper in-line sequence of all components.
3. Check valve position. The inlet flange has been marked and is to be in the upstream
position.
4. Verify all electrical connections against wiring diagrams and unit specifications.
Reference Figure 4-3 for Control Valve configuration.