Emerson Fisher Vonk Choke Series, Инструкция по эксплуатации

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Instruction Manual
D104485X012
Vonk Choke Valves
September 2019
5
Operation
Manual: Manual shut-off valves are designed to 'shut' when the handwheel is turned clockwise and 'open' when the
handwheel is turned counter-clockwise (including valves with gearbox operators). Handwheels of electric actuators (or
pneumatic actuators) are for emergency operation only.
Pneumatic / Hydraulic: Choke valves fitted with a pneumatic or hydraulic actuator must be connected and operated in
accordance with the actuator manufacturer instructions. Refer to the actuator instruction manual.
Electric: Choke valves fitted with an electrical actuator must be connected and operated in accordance with the
actuator manufacturer instructions. Refer to the actuator instruction manual.
Positioner: Choke valves fitted with a positioner must be connected and operated in accordance with the positioner
manufacturers instructions. Refer to the positioner instruction manual.
Maintenance of Valve Internals
Valve parts are subject to normal wear and must be inspected regularly and replaced when necessary. The frequency
of inspection and replacement depends on the severity of service conditions.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or uncontrolled movement of parts.
Before performing any maintenance operations:
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Do not remove the actuator from the valve while the valve is still pressurized.
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Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
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Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
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Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
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Vent the power actuator loading pressure and relieve any actuator spring pre‐compression.
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Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
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The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
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Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
WARNING
Follow instructions carefully to avoid damaging the valve sealing and packing surfaces, which could result in excessive
leakage at shutoff or allow process fluid to leak to atmosphere.
Note
Whenever a gasket seal is disturbed by removing or shifting gasketed parts, install a new gasket during reassembly. This ensures a
good gasket seal because the used gasket may not seal properly.