Cla-Val 580 Series - Manual (Page 2)

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:
The unique seating action begins with the initial contact
between the metal valve disc and the Buna-N® Seal.
As pressure increases, Buna-N® seal is slightly com-
pressed and allows the disc to make contact with the
metal portion of the valve seat. This metal-to-metal
contact prevents any further compression of the
Buna-N® seal. (Over compression of the synthetic
seal can lead to its destruction and cause potential
leakage.)
PROVIDES DROP-TIGHT SEATING
AT LOW PRESSURES WITHOUT DAMAGE TO
BUNA-N ® SEAL AT HIGHER PRESSURE
Silent Check Valve
Buna-N® Seating Detail
(Optional)
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
Plug
Seat
Body
Buna-N Seal
Open ®
Plug
Seat
Body
Buna-N Seal
Closed ®
CLA-VAL
Copyright Cla-Val 2011 Printed in USA Specifications subject to change without notice.
P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: 949-722-4800 • Fax: 949-548-5441 • E-mail: [email protected] • Website cla-val.com
©
N-580/581 (R-3/2011)
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*
Plug*
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
Valve Closed
Seated
with Pressure
Valve Open
Unseated
Pressure