Emerson Fisher Vonk Choke Series, Инструкция по эксплуатации

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Instruction Manual
D104485X012
Vonk Choke Valves
September 2019
6
Figure 3. Vonk Choke Valve Internals
TURNING FORK
PROTECTING BUSH
FRONT DISK
SPRING WIRE
BEAN
TURNING FORK MARK
Prior to any inspection or maintenance, refer to the appropriate parts list and associated figure for the choke valve
type and seal configuration.
After the choke valve has been disassembled, a new set of soft seals must be used. The trim and bonnet can be
replaced and/or inspected without removing the body out of the line.
For inspection of the choke valve, an internal wrench tool is required.
Disassembly
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
1. Isolate the choke valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut‐off all pressure lines to the power
actuator.
2. Unscrew the air tubing. In case of a conventional type valve positioner, check the cam in the valve positioner (zero
position open when the actuator is spring to close, and zero position closed when the actuator is spring to open).
3. Unscrew the bonnet nuts and lift the bonnet and actuator from the body.