DeZURIK
APCO CSD-800 Slanting Disc Check Valves
July 2017
Page 7
D12012
Maintenance
(Continued)
Valve Body Disassembly
See Figure 6 for part identification.
These valves may open or close without warning due to flow changes from pumps starting
and stopping. Servicing 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 pipeline pressure and lockout the pumps before servicing the valve.
2. Either remove the valve completely from the pipeline to separate the two diagonal flanges or
leave the inlet half (1) bolted in place.
3. Lay valve on the floor with the pivot body half (2) on top.
4. Drive out the two locating pins (21) and remove diagonal flange bolts (7).
5. Remove pivot pin cover screws (17), pivot pin covers (16), pivot pin cover gaskets (15) and
pivot pins (13) from pivot body half (2).
6. Lift off pivot body half (2), and then the disc (10).
7. Inspect all wear parts and seating surfaces and replace if necessary.
Valve Body Assembly
See Figure 6 for part identification.
1. If seat ring (8) is damaged, remove seat ring from seat body half (1). If seat ring seal (19) is
damaged, remove old seat ring seal and place new seat ring seal and new seat ring in seat
body half.
2. If diagonal flange seal (6) is damaged, remove old seal from seat body half (1) and place a new
diagonal flange seal in seat body half.
3. If disc ring (11) is damaged, remove disc ring screws (12) and disc ring from disc (10).
4. If disc ring gasket (20) is damaged, remove old gasket from disc (10), place a new disc ring
gasket in disc and attach new disc ring (11) with disc ring screws (12) to disc.
5. If pivot pin bushings (14) are damaged, remove old bushings and place new bushings in disc
(10).
6. Place disc (10) into pivot body half (2) and inset pivot pins (13) into pivot body half.
7. If pivot pin cover gaskets (15) are damaged, place new gaskets on into pivot body half (2) and
attach pivot pin covers (16) with pivot pin cover screws (17) to pivot body half.
8. Place pivot body half (2) assembly on seat body half (1) , line up locating pin holes and insert
pins (21) into seat body half (1) and pivot body half (2).