DeZurik APCO SRG-6500 Manuel d'instruction - Page 7
Parcourez en ligne ou téléchargez le pdf Manuel d'instruction pour {nom_de_la_catégorie} DeZurik APCO SRG-6500. DeZurik APCO SRG-6500 11 pages. Surge relief globe valves
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Maintenance
(Continued)
Disc Seat Replacement
These valves may open or close, swinging the counterweight/spring loaded arm
without warning due to flow changes from pumps starting and stopping.
Servicing or working around these valves while the pipeline is under pressure
can cause personal injury or equipment damage.
Workers must be cautious when working around these valves.
Relieve pipeline pressure and lockout the pumps before servicing the valve.
1. Relieve the pressure in the pipeline and close the valve.
2. Remove valve from pipeline.
3. Remove Seat Retaining Ring Screws (32) and Seat Retaining Ring (31) from Disc (10).
4. Remove old Disc Seat (6) and replace with new disc seat.
5. Re-install Seat Retaining Ring Screws (32) and Seat Retaining Ring (31) in Disc (10).
6. Re-install valve in pipeline.
Operation
Surge pressure above that for which the valve was set, will open the disc (10), causing the
counterweight arm and cylinder piston to rise to the up position. As the piston rises in the cushion
cylinder (20), oil is drawn into the cushion chamber from the oil reservoir through the flow control valve
(59). The amount that disc will open depends on the surge pressure and velocity of the media flowing
through the valve.
When surge pressure has been relieved and pressure in the system drops to normal, the disc will close.
The speed at which the disc returns to the closed position is controlled by adjusting the flow control
valve. Opening the flow control valve will result in faster closing, and throttling down on control valve
will give a longer closing time.
Start-up Procedure
1. With the Surge Relief Valve disc completely closed and the oil reservoir in a vertical position,
check the oil level. Fill system up to the street elbow located on the side of the oil reservoir with
oil as specified in the "Oil Filling Procedure". The oil reservoir is provided with a breather cap so
that it remains at atmospheric pressure at all times.
NOTE: The valve is shipped from the factory with a ¼ NPT pipe plug on top of the oil reservoir.
Remove this plug and install the air breather cap provided.
2. Open flow control valve three complete turns counter-clockwise from fully closed position. See
"Adjustment of Flow Control Valve".
3. Turn cushion adjustment screw two complete turns counter-clockwise from fully closed position.
See "Operation of internal Cushion".
December 2012
APCO SRG-6500 Surge Relief Globe Valves
Page 7
DeZURIK
D12020