Cla-Val 581 Series Technical Manual - Manual (Page 5)

1. Shut off pump and pressure upstream and shut off isolation valve downstream
to completely isolate check valve. A skilled pipe fitter should be used for
this work.
2. Lay valve to rest on its downstream side and remove cap screws as
shown in Fig. 3. Note that 2" and 2-1/2" valves threaded seats in lieu of
cap screws.
3. Grip seat spokes by hand to pull out seats or push down the disc and
release quickly to allow force of the spring to pop out the seat.
4. With seat removed, check that all internal parts are freely removable from
valve body.
5. Examine all parts for wear/damage and order replacement PARTS KITS
as shown below.
TO REMOVE VALVE FROM PIPELINE FOR INSPECTION:
1
5
4
3
2
6
DOWN STREAM
SIDE
FIG. 3 UP STREAM
SIDE
DOWN STREAM
SIDE
UP STREAM
SIDE
REMOVE
CAP SCREWS
DISC SEAT
FLOW
N-580/581 (R-11/01)
A- Kit Includes Detail 2 Bronze Seat & Detail 3 Disc
B- Kit Includes Detail 2 Stainless Steel Seat & Detail 3 Disc
C- Kit Includes Detail 2 Stainless Steel Seat, Detail 3
Disc, Detail 4 Spring, & Detail 5 Bronze Bushing
D- Kit Includes Detail 2 Stainless Steel Seat, Detail 3
Disc, Detail 4 Spring, & Detail 5 Stainless Steel Bushing
Series 580 Wafer Style Series 581 Globe Style
580
580
580
580
580
580
580
580 2”
2 1/2”
3”
4”
5”
6”
8”
10”
A B C D
A B C D
A B C D
A B C D
A B C D
A B C D
A B C D
A B C D 2”
2 1/2”
3”
4”
5”
6”
8”
10”
12”
14”
581
581
581
581
581
581
581
581
581
581 A
A
A
A
A
A
A
A
A
A B
B
B
B
B
B
B
B
B
B C
C
C
C
C
C
C
C
C
C D
D
D
D
D
D
D
D
D
D
Model Size Kits Model Size Kits
Detail
1
2
3
4
5
6
Description
Body
Seat*
Disc*
Spring*
Bushing*
Screw*
Material
Cast Iron
Bronze or SS
Bronze or SS
(Optional Buna-N
® )
Stainless Steel
Bronze
Stainless Steel
(3” & larger valves)
* Recommended Spare Part Kit
Note 2: All size 2” and 2 1/2” valves have
threaded seats in liev of screws
Silent Check Valve Spare Part Kits