Emerson 788 DVC manual Cylinder Assembly Removal All Daniel Valves

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DANIELTM MODEL 788DVC DIGITAL CONTROL VALVES

D E C 2012

5.0CYLINDER DISASSEMBLY AND REASSEMBLY

The following tools will be needed to disassemble and reassemble your control valve:

socket wrench

adjustable wrench

T-handle or extended Allen wrench

arbor press (may be needed for 4- and 6-inch valves)

retaining ring pliers

Numbers in parentheses correspond with the item numbers in Table 7-1 and Figure 7-1.

EQUIPMENT DAMAGE

Read the entire recommended procedure for all installation operations and maintenance procedures before attempting to install or disassemble the valve. Disassembly of this cylinder assembly is different from previous Daniel Control Valves and requires strict adherence to the procedures outlined in this manual.

Failure to read and comply with these procedures could result in damage to the equipment and compromise in the integrity of the operation.

5.1Cylinder Assembly Removal - All Daniel Valves

1.Isolate the Control Valve from the system and bleed off pressure.

2.Loosen and remove the tubing from the cylinder head.

3.Remove the nuts securing the cylinder assembly within the valve body.

4.Tighten the two jack screws provided in the cylinder head until the cylinder assembly has been freed from the valve body. These screws should be tightened evenly to prevent damage to the cylinder O-ring and binding the cylinder assembly.

5.Remove the cylinder assembly from the valve body by pulling upward and evenly using both hands (on smaller valves) or a mechanical device (for larger models).

6.Remove the two jack screws from the cylinder head.

DISASSEMBLY AND REASSEMBLY

5-1

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Contents DanielTM Model 788 DVC digital control valves This page intentionally left blank Important safety instructions Product operation personnel Safety alert symbol Safety signal words and symbolsThis page intentionally left blank Page Warranty and limitation of liability Introduction Tables FiguresAggressive Products Danieltm Model 788DVC Digital Control Valves IntroductionEquipment Damage Principle of OperationOperational Sequence Closed Position Open Control Position Open Position no control Maximum Safe Working Pressure Do not exceed specifications listed belowSafe Working Temperature Ranges Pressure ClassValve Capacity ConnectionsFlow vs. Pressure Drop See Figure Flow vs Pressure Loss Main Valve Cylinder Pressure/Temperature RatingsMaterials of Construction Main Valve Body Cylinder HeadTubing Astm A352 LCC WCB Dimensions Valve Size 150# Ansi 300# Ansi No Indicator With Indicator Recommended Installation Instructions General Considerations as Applied to the DL8000 Use equipment for its intended purpose Personal Injury or Death AND/OR Property DamageTypical Application Top Loading Typical Application Bottom Loading Control Valve Configuration new for DL8000 Cylinder Assembly Removal All Daniel Valves Cylinder Disassembly Recommended Low Flow Set-point Cylinder Reassembly Retrofit Cup-seal Replacement on Existing AP Option PistonOption Assembly Danieltm Model 788DVC Digital Control Valves Personal Injury AND/OR Equipment Damage Danieltm Model 788DVC Digital Control Valves Troubleshooting Condition Probable Cause Correction Danieltm Model 788DVC Digital Control Valves Parts List Parts List 2, 3, 4, 6, 8 Sizes Recommended Spare Parts Valve Cylinder Assembly Infectious Radioactive Explosive Pyrophoric Poison Gas Decontamination/Cleaning Fluids ProcessShipping Requirements Page W .em erson.com