Cla-Val 98-06/698-06 Technical Manual User Manual

Page 4

CATALOG NO.

98-06/698-06

DIST. CODE 002

OPERATING DATA-CONTINUED

TYPE OF VALVE AND MAIN FEATURES

CVCL 1 2 3 4

2-03-11

208358

SHEET 3 OF 5

DRAWING NO.

REV

METHOD II:

SYSTEM FLOW SHOULD BE APPROXIMATELY EQUAL TO THE EXPECTED LOW FLOW CONDITION

FOR THE SYSTEM AT THE START OF THE ADJUSTMENT PROCEDURE.

1. ISOLATION VALVE (6B) IS OPEN. ISOLATION VALVE (6A) IS OPEN.

2. ADJUST 6120 NEEDLE VALVE (9) SO THAT IT IS 2 TURNS OUT.
3. TURN THE X78-4 (5) ADJUSTMENT SCREW COUNTER-CLOCKWISE UNTIL STOPPED.
4. TURN THE CPM-A (4) LOW PRESSURE ADJUSTMENT SCREW CLOCKWISE UNTIL STOPPED.
5. TURN THE CPM-A (4) HIGH PRESSURE ADJUSTMENT SCREW UNTIL THE PRESSURE AT GAGE (8)

IS AT THE DESIRED MAXIMUM SYSTEM (DOWNSTREAM) PRESSURE CONDITION.

6. CLOSE ISOLATION VALVES (6A) & (6B).
7. SLOWLY TURN THE CPM-A (4) LOW PRESSURE ADJUSTMENT SCREW OUT (COUNTER CLOCKWISE)

UNTIL PRESSURE AT GAGE (8) STARTS TO DIP. CONTINUE TO ADJUST UNTIL PRESSURE AT GAGE (8)
IS AT THE DESIRED LOW PRESSURE SET POINT.

8. OPEN ISOLATION VALVE (6A).
9. TO ADJUST X78-4 (5) WHEN SYSTEM FLOW IS AT OR NEAR LOW DEMAND STATUS, TURN

X78-4 (5) ADJUSTMENT SCREW CLOCKWISE 2 TURNS. AT THIS ADJUSTMENT POSITION THE
SYSTEM PRESSURE REMAINS AT THE LOW PRESSURE SET POINT UNTIL VALVE POSITION INCREASES
TO A POSITION CHANGE ACCORDING TO THE X78-4 (5) ADJUSTMENT TABLE NOTED ON
SHEET 5. WHEN VALVE POSITION INCREASES TO THE ADJUSTMENT SETTING OF THE X78-4 (5),
SYSTEM PRESSURE INCREASES TO THE CPM-A (4) HIGH PRESSURE SET POINT, INDICATING SYSTEM
DEMAND HAS INCREASED. PER THE X78-4 (5) ADJUSTMENT TABLE, AT 2 CLOCKWISE TURNS A
4" VALVE WILL TRANSITION TO THE HIGH PRESSURE SET POINT WHEN VALVE POSITION INCREASES
APPROXIMATELY 10.6% (2 X 5.3%). FURTHER ADJUSTMENT MAY BE NECESSARY TO ACHIEVE THE
DESIRED TRANSITION POINT BETWEEN HIGH AND LOW PRESSURE SET POINTS.

NOTE: ADJUSTMENT METHODS I & II ARE INTENDED ONLY TO APPROXIMATE THE LOW & HIGH
PRESSURE SET POINT CONDITIONS IF THERE IS NO MEANS TO INDEPENDENTLY CONTROL SYSTEM
FLOW OR ESTABLISH A DESIRED PRESSURE TRANSITION FLOW CONDITION. THE X78-4 ADJUSTABLE
ORIFICE ASSEMBLY (5) MAY REQUIRE SLIGHT READJUSTMENT DURING ACTUAL LOW FLOW
CONDITIONS IN ORDER TO ESTABLISH THE DESIRED PRESSURE TRANSITION CONDITION. CLA-VAL
RECOMMENDS RECORDING PRESSURE AND FLOW DATA AS A MEANS OF EVALUATING DAILY
OR PERIODIC PRESSURE AND FLOW TRENDS IN THE SYSTEM. THIS DATA CAN BE UTILIZED TO MAKE

ADDITIONAL ADJUSTMENTS TO THE PRESSURE MANAGEMENT CONTROL VALVE AND OPTIMIZE
THE PRESSURE MANAGEMENT CONDITIONS IN THE SYSTEM. CONSULT FACTORY FOR CLA-VAL

DATA LOGGING PRODUCTS THAT CAN BE USED WITH THIS VALVE.

METHOD I :
9. TO ADJUST X78-4 (5) WHEN SYSTEM FLOW IS AT OR NEAR NORMAL DEMAND STATUS, TURN

X78-4 (5) ADJUSTMENT SCREW CLOCKWISE UNTIL PRESSURE AT GAGE (8) DIPS TO LOW
PRESSURE SET POINT CONDITION. NEXT TURN THE X78-4 (5) ADJUSTMENT SCREW COUNTER-
CLOCKWISE 1 TURN. AT THIS ADJUSTMENT POSITION THE SYSTEM PRESSURE REMAINS AT THE
HIGH PRESSURE SET POINT UNTIL VALVE POSITION DECREASES TO THE ADJUSTED POSITION OF
THE X78-4 (5). REFER TO THE X78-4 (5) ADJUSTMENT TABLE ON SHEET 5 FOR POSITION CHANGE
PER TURN. PER THE X78-4 (5) ADJUSTMENT TABLE, AT 1 CLOCKWISE TURN A 4" VALVE WILL
TRANSITION TO THE LOW PRESSURE SET POINT WHEN VALVE POSITION DECREASES
APPROXIMATELY 5.3%. FURTHER ADJUSTMENT MAY BE NECESSARY TO ACHIEVE THE DESIRED
TRANSITION POINT BETWEEN HIGH AND LOW PRESSURE SET POINTS.

PRESSURE MANAGEMENT CONTROL VALVE

WITH X58E & ACCUMULATOR (SIZES 2" - 10")

2-08-11