Cla-Val 50B-4KG1/2050B-4KG1 Technical Manual - Manual (Page 3)

SEE SHEET 1
LTR
DATE
BY
CAD REVISION RECORD - DO NOT REVISE MANUALLY
DESCRIPTION
TYPE OF VALVE AND MAIN FEATURES
OPERATING DATA
II. PRESSURE RELIEF FEATURE
PRESSURE RELIEF CONTROL (2) IS A SPRING LOADED, NORMALLY CLOSED PILOT CONTROL THAT
MODULATES (OPENS AND CLOSES) MAINTAINING A RELATIVELY CONSTANT PRESSURE AT THE
MAIN VALVE (1) INLET. A BRIEF EXPLANATION OF THE OPENING AND CLOSING CYCLE IS AS
(c) WHEN FLOW OUT OF MAIN VALVE COVER CHAMBER THROUGH CONTROL (2)
EXCEEDS FLOW INTO THE MAIN VALVE COVER CHAMBER THROUGH STRAINER &
ORIFICE (3), PRESSURE IN THE MAIN VALVE COVER CHAMBER IS REDUCED.
2-29-72 JM
2-29-72 JM
8-3-71 JM
T 80984
50B-4KG1 (GLOBE)
CATALOG NO.
APV'D
CHK'D
DRAW
DESIGN
DRAWING NO. REV.
SHEET 2 OF 2 DIST. CODE 050 CVCL 1 2 3 4
(d) WITH REDUCED PRESSURE IN THE MAIN VALVE COVER CHAMBER AND FULL INLET PRESSURE
UNDER THE MAIN VALVE DISC, THE MAIN VALVE (1) OPENS.
2050B-4KG1 (ANGLE)
WITHIN THE RANGE SHOWN ON THE PRESSURE RELIEF CONTROL (2) NAMEPLATE.
PRESSURE AT THE MAIN VALVE INLET. THE PRESSURE RELIEF SET POINT IS EASILY ADJUSTED
ACTUATED PILOT CONTROLLED VALVES DESIGNED TO MAINTAIN A RELATIVELY CONSTANT
THE CLA-VAL 50B-4KG1 AND 2050B-4KG1 PRESSURE RELIEF VALVES ARE DIAPHRAGM
I. DESCRIPTION
RESPONDS TO SLIGHT PRESSURE CHANGES AT MAIN VALVE INLET. AN INCREASE IN INLET
PRESSURE TENDS TO OPEN CONTROL (2) AND A DECREASE IN INLET PRESSURE TENDS TO CLOSE
CONTROL (2). THIS CAUSES MAIN VALVE COVER PRESSURE TO VARY AND THE MAIN VALVE (1)
FOLLOWS:
THE FORCE OF THE SPRING IN CONTROL (2), CONTROL (2) OPENS.
(b) WHEN FORCE CREATED BY INLET PRESSURE UNDER DIAPHRAGM OF CONTROL (2) EXCEEDS
DIAPHRAGM OF CONTROL (2).
(a) INLET PRESSURE IS DIRECTED THROUGH THE SENSING LINE TO THE ACTUATING
OPENING CYCLE:
CLOSING CYCLE:
(a) WHEN FORCE CREATED BY INLET PRESSURE UNDER DIAPHRAGM OF CONTROL (2) IS LESS
THAN THE FORCE OF THE SPRING IN CONTROL (2), CONTROL (2) CLOSES.
STRAINER & ORIFICE (3) AND THE MAIN VALVE (1) CLOSES.
(b) AS A RESULT, THE MAIN VALVE (1) COVER CHAMBER IS SLOWLY PRESSURIZED THROUGH THE
III. PRESSURE RELIEF CONTROL (2) ADJUSTMENT
(a) REMOVE PLASTIC CAP (TURN COUNTERCLOCKWISE).
(b) LOOSEN ADJUSTING SCREW JAM NUT (TURN COUNTERCLOCKWISE).
(c) TURN ADJUSTING SCREW CLOCKWISE TO INCREASE PRESSURE RELIEF SET POINT
(OR COUNTERCLOCKWISE TO DECREASE SET POINT).
(e) REPLACE PLASTIC CAP.
(d) RE-TIGHTEN JAM NUT.
1. PERIODIC CLEANING OF STRAINER SCREEN IN ITEM (3) & (6) IS RECOMMENDED.
NOTES:
MAIN VALVE (1) CLOSED.
MAINTAINS THE HIGHER PRESSURE IN THE MAIN VALVE (1) COVER CHAMBER KEEPING THE
WHEN COVER PRESSURE IS HIGHER THAN INLET PRESSURE, CHECK VALVE (4) CLOSES. THIS
IV. CHECK VALVE FEATURE:
2. RELIEF VALVE (2) SHOULD BE TESTED AFTER INSTALLATION TO VERIFY SETTING.
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PRESSURE RELIEF VALVE
FACTORY MUTUAL APPROVED FOR VALVE SIZES 3", 4", 6" & 8"
UL LISTED FOR VALVE SIZES 3", 4", 6" & 8" (GLOBE); 3", 4", 6" & 8" (ANGLE)