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4660 Pressure Pilot
May 2014
WARNING
Avoid personal injury or property damage from an uncontrolled process or sudden release of process pressure. Before
starting disassembly:
D Always wear protective clothing, gloves, and eyewear when performing any maintenance operations.
D Do not remove the actuator from the valve while the valve is still pressurized.
D Provide some temporary means of process control before taking the pilot out of service.
D Shut off the process pressure line and the supply pressure line, and bleed all of the supply pressure.
D Bleed all process pressure from the pilot so that no pressure is contained in the Bourdon tube.
D When bleeding the supply or process pressure, natural gas, if used as the supply medium, will seep from the unit into
the surrounding atmosphere. Personal injury or property damage may result from fire or explosion if preventative
measures are not taken, such as adequate ventilation and the removal of any ignition sources.
D Use lock‐out procedures to be sure that the above measures stay in effect while you are working on the equipment.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Bourdon Tube/ Flapper Assembly Replacement
Obtain the Bourdon tube/flapper assembly kit listed in the parts kit section.
1. Remove the case cover screw (key 5) and the case cover (key 3).
2. Unhook the flapper spring (key 18) from the Bourdon tube/flapper assembly. Inspect the flapper spring, and replace
it if the coils are separated when the spring is in its free state with no extension.
3. Loosen the screws (key 27), and remove the Bourdon tube/flapper assembly.
4. Disconnect the process tubing (key 8).
5. Install a new Bourdon tube/flapper assembly and tighten the machine screws.
6. Reconnect the process tubing to the Bourdon tube/flapper assembly.
7. Reconnect the flapper spring to the Bourdon tube/flapper assembly.
8. Replace the case cover, and attach it with the case cover screw.
9. If appropriate, place a new label (key 73) with the new Bourdon tube set range on the front plate (key 74).
10. Reset the high and/or low set points according to the procedures presented in the Operating Information section.
11. Refer to the alignment of the nozzle beam procedures in the Operating Information section.
Block‐and‐Bleed Relay Assembly Replacement
Obtain the block‐and‐bleed relay assembly listed in the parts kit section.
1. Make sure supply pressure is shut off and vented.
2. Remove the case cover screw (key 5) and the case cover (key 3).
3. Remove the machine screws (key 57).
4. Remove the block‐and‐bleed relay assembly.
5. Make sure the O‐rings are in place on the bottom flange, then install a new block‐and‐bleed relay assembly.
6. Tighten the machine screws.
18
Instruction Manual
D200163X012
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