Operation sequence typical application, Fluid control at it's best, Cmodel – Cla-Val 50B-4KG1/2050B-4KG1 Technical Manual User Manual
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Listed/Approved Fire Protection Pressure Relief Valve
50B-4KG1 Globe
2050B-4KG1 Angle
• U.L. Listed / U.L.C. Listed
• Factory Mutual Approved
• Fast Opening to Maintain Steady Line Pressure
• Accommodates Wide Range of Flow Rates
• Closes Gradually for Surge-Free Operation
• Adjustable Pressure Settings, Not Affected by
Pressure At Valve Discharge
The Cla-Val Model 50B-4KG1 Globe / 2050B-4KG1 Angle
Pressure Relief Valve is designed specifically to automati-
cally relieve excess pressure in fire protection pumping sys-
tems. Pilot controlled, it maintains constant system pres-
sure at the pump discharge within very close limits as
demands change. The 50B-4KG1 and 2050B-4KG1 can be
supplied with optional internal and external epoxy coating of
the main valve wetted surfaces.
At pump start, Cla-Val Relief Valve modulates to relieve
excess pump capacity, maintaining positive system pres-
sure at the pump discharge.
When fire demand slows or ceases, Cla-Val Model
50B-4KG1 opens, diverting entire pump output to dis-
charge, allowing fire pump to be stopped without causing
surging in the lines.
(Please note that if the Model 50B-4KG1 is to be used on
a continuous duty basis to maintain fire-system pressure,
suitable back pressure must be provided on the valve to
prevent cavitation damage. Consult the factory for details.)
Operation Sequence
Typical Application
KOModel 2050B-4KG1
Pressure Relief Valve
(Angle Pattern)
Fire Pump
Check Valve
"Fluid Control at It's Best"
2050B-4KG1 (Angle)
To Fire
Protection System
U.L. Listed...............Sizes 3" thru 8"
F.M. Approved.........Sizes 3" thru 8"
U.L.C. Listed............Sizes 2” thru 10”
L
ABL
LED BY
U
N
D
E
R
W
R
IT
E
R
S L
ABORATOR
IE
S
O
F
C
A
N
A
D
A
U
L
C
MODEL
Optional UL Listed Materials for Seawater and Severe
Service Applications:
• Nickel Aluminum Bronze (NAB) - ASTM B148 Alloy C95800
• Monel - QQ-N-288 Comp B - ASTM A494 Grade M30H
• Cast Steel - ASTM A216 Grade WCB
• 316 Stainless Steel - ASTM A743 Grades CF3M and CFM8
• Super Austenitic Stainless Steel - ASTM A351 Grade
CK3MCuN (SMO 254)
• Super Duplex Stainless Steel - ASTM A890 Grade 5A
(CE3MN)