TYPES & MAINTENANCE OF VALVES

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TYPES OF VALVES

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• Valves are simple in concept. The basic idea consists of placing a disc over a seat opening in such a way that the resulting closure is tight. From this simple idea, three basic design of valves have emerged:

1. Gate Valve
2. Globe Valve
3. Check valve

• A valve is mechanical device usually used in connection with a pressure containing vessel to stop or regulate flow

Preventive Maintenance of Valves

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1. GENERAL :

ALL THE STATION VALVES SHALL BE MAINTAINED REGULARLY TO ENSURE THEIR SAFE AND PROPER OPERATION DURING THE COURSE OF NORMAL OPERATION AND IN CASE OF ANY EMERGENCY.

2. MAINTENANCE SCHEDULE AND REPORTING :

a) ALL THE STATION VALVES SHALL BE LUBRICATED EVERY MONTH.

b) THE DRIVE BUSH OF THE MOTOR OPERATED VALVE SHALL BE CHECKED EVERY 2 YEARS.

c) EVERY VALVE SHALL BE CHECKED FOR PASSING OF THE GATE BY OPENING THE BOTTOM DRAIN VALVE ONCE IN A YEAR.

d) THE VALVE SHALL BE INSPECTED AND COMPLETELY OPERATED ANNUALLY AS PER THE PROFORMA NO. PL/MNT/(M)/52.

e) ALL THE MOTOR OPERATED VALVES (MOVs) ARE TO BE OPERATED ELECTRICALLY (ON LOCAL AS WELL AS ON REMOTE) AND INDICATION LIGHT TO BE WATCHED ON CONTROL PANEL TO ENSURE PROPER FUNCTIONING OF THE ACTUATORS.

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