Cla-Val 581 Series Technical Manual - Manual (Page 2)

Cast Iron ASTM A126 Class B
Bronze ASTM B584
Stainless Steel ASTM A313.5
Stone Tumbled
2 1/2 " to 42"
Valve Body:
Disc & Seat:
Spring:
Sizes:
All materials of construction shall conform to ASTM
specifications as follows:
Silent Globe Check Valve
1 2 3 4 5 6 7 8 9 10 11 12
Series 581 Pressure Loss Curve
3
2
1
7
6
5
4
3
2
1
Pressure Loss PSI
Pressure Loss Ft. of W
a
ter
Fluid Velocity / FPS
(Typical)
Series 581
FM
APPROVED
• Operates Horizontally or Vertically
• Watertight Seating
• Field Replaceable Parts
• Factory Mutual Approved – Various Sizes
• Optional Resilient Seat
The Cla-Val Series 581 Silent Globe Check Valve has a spring-
loaded poppet that allows the valve to close before flow reversal
occurs, resulting in a silent, non-slam closure. It is a truly silent
check valve. For ease of installation, the valve can be installed
in vertical or horizontal positions with flow up or flow down. Silent
Globe Check Valves are available in 2 1/2” to 42” sizes, with
either a 125 lb. or 250 lb. pressure class rating. Silent Globe
Check Valves in 3” to 10” sizes have enough outlet clearance to
allow them to be bolted directly to wafer style butterfly valves.
Constructed of a cast iron body with bronze trim, the Cla-Val
Silent Globe Check Valve offers watertight shutoff with metal-to-
metal seating. For special applications, stainless steel trim and
Buna-N
® resilient seats are available as options. All materials
conform to ASTM specifications, ensuring long lasting reliable
performance. As a confirmation of Cla-Val’s commitment to quality,
2 1/2” to 12” 125 lb. class Series 581 valves are Factory Mutual
approved.
SPECIFICATIONS
The silent globe check valve shall consist of a heavy
cast iron body, bronze seat, bronze disc, and stain-
less steel spring. The valve disc shall be center
guided at both ends with an integral shaft and shall
be spring loaded for silent operation. The spring shall
be helical or conical and stone tumbled to achieve a
micro-finish to resist mineral deposits. For ease of
maintenance, the seat and disc shall be replaceable
in the field.
Check valve shall be capable of silent operation
when installed in vertical or horizontal positions with
either flow up or flow down. The flow area through the
body shall be equal to or greater than the cross-sec-
tion area of the equivalent pipe size. Sizes 3” to 10”
shall allow bolting a wafer style butterfly valve direct-
ly to the outlet flange without a spool piece. The valve
shall be a Cla-Val Series 581 Silent Globe Check
Valve.
CLA-VAL TM
¤
CLA-VAL TM
¤
PRESSURE / TEMPERATURE RATINGS
WAFER AND GLOBE STYLE SILENT CHECK VALVES
MAXIMUM NON-SHOCK WATER SERVICE PRESSURE
GRAY IRON
125 LB. CLASS
2” - 12”
200
190
*
300
0 -150 º
200 º
250 º
TEST
PRES.
TEMP
DEG F.
14” - 42”
150
135
*
230
2” - 12”
300
280
270
450
14” - 42”
250
230
220
375
2” - 12”
400
370
*
600
14” - 42”
300
280
*
450
2” - 12”
500
460
440
750
14” - 42”
400
370
355
600
DUCTILE IRON
150 LB. CLASS
GRAY IRON
250 LB. CLASS
DUCTILE IRON
300 LB. CLASS
* Ductile Iron Recommended For Hot Water Service Above 200 º F.