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

Page 5

OPERATING DATA-CONTINUED

SHEET 4 OF 5

DIST. CODE 002

CVCL 1 2 3 4

TYPE OF VALVE AND MAIN FEATURES

DRAWING NO.

REV

98-06/698-06

CATALOG NO.

III. ADJUSTABLE ORIFICE FEATURE:

X78-4 + X101 ADJUSTABLE ORIFICE ASSEMBLY (5) IS AN ADJUSTABLE ORIFICE WITH AN X101

POSITION INDICATOR. THE X78-4 ADJUSTABLE ORIFICE ASSEMBLY (5) IS USED TO INCREASE THE

TRANSITION POINT (% OPEN) BETWEEN THE LOW AND HIGH PRESSURE SET POINTS OF THE

CPM-A (4). PRIOR TO ADJUSTING X78-4 (5) FEATURE, LOOSEN SET SCREW ON SIDE OF X78-4 (5)

HOUSING APPROXIMATELY 1/2 TURN. SET SCREW IS LOCATED NEAR THE TOP OF THE X78-4 (5)
HOUSING. TO LOWER THE DOWNSTREAM PRESSURE AT THE CURRENT (OR KNOWN) FLOW RATE,

TURN THE X78-4 (5) ADJUSTMENT SCREW CLOCKWISE UNTIL THE PRESSURE READING AT GAGE (8)

DROPS TO THE LOW PRESSER SET POINT OF THE CPM-A (4). THE X78-4 (5) ADJUSTMENT SCREW

CAN BE TURNED BY HAND OR WITH AN OPEN END WRENCH.

NOTE: ADJUSTING X78-4 (5) SHIFTS THE FLOW POINT WHERE THE PRESSURE CONDITION STARTS TO

TRANSITION BETWEEN THE LOW AND HIGH PRESSURE SET POINTS. BY TURNING THE ADJUSTMENT
SCREW COUNTERCLOCKWISE ON THE X78-4 (5), THE TRANSITION BETWEEN THE LOW AND HIGH

PRESSURE SET POINTS OCCURS AT A LOWER FLOW RATE. AS AN EXAMPLE, WHEN THE X78-4 (5)

ADJUSTMENT SCREW IS TURNED COUNTERCLOCKWISE UNTIL BOTTOMED THE TRANSITION

BETWEEN LOW AND HIGH PRESSURE STARTS AT THE LOWEST POSSIBLE FLOW RATE. TURNING THE

X78-4 (5) ADJUSTMENT SCREW CLOCKWISE CHANGES THE TRANSITION POINT TO A HIGHER FLOW

RATE. THE X78-4 (5) ADJUSTMENT TABLE NOTED ON SHEET 5 CAN BE USED AS A GUIDELINE TO
DETERMINE VALVE POSITION CHANGE (% OPEN) PER TURN OF X78-4 (5) ADJUSTMENT SCREW.

II. LOW PRESSURE OVERRIDE FEATURE:
OPEN ISOLATION VALVE (6B) TO OVERRIDE LOW PRESSURE SET POINT OF CPM-A CONTROL (4).
LOW PRESSURE SET POINT IS DISABLED AND MAIN VALVE (1) REGULATES AT THE HIGH PRESSURE

SET POINT AS LONG AS ISOLATION VALVE (6B) REMAINS OPEN. CLOSE ISOLATION VALVE (6B)
TO RESTORE LOW PRESSURE SET POINT CONDITION.

IV. ACCUMULATOR FEATURE:

ACCUMULATOR (11) FUNCTIONS AS A PRESSURE TRANSITION DAMPENING FEATURE THAT ALLOWS

FOR A RELATIVELY SMOOTH TRANSITION BETWEEN LOW AND HIGH PRESSURE SET POINTS OF THE

98-06/698-06 PRESSURE MANAGEMENT VALVE. THIS FEATURE IS FACTORY AIR CHARGED TO
APPROXIMATELY 51 PSI (3.5 BAR). THIS PRE-CHARGE CONDITION IS SATISFACTORY FOR MOST
98-06/698-06 PRESSURE MANAGEMENT APPLICATIONS AND NO FIELD CHARGING IS REQUIRED.
IF THE LOW PRESSURE SET POINT CONDITION IS GREATER THAN 80 PSI (5.5 BAR), THEN A SLIGHTLY

HIGHER ACCUMULATOR (11) AIR CHARGE PRESSURE MAY BE DESIRED. THE ACCUMULATOR (11)
HAS A STEM VALVE THAT IS THE SAME AS THE STEM VALVE USED ON BICYCLE OR VEHICLE TIRES.

AIR CHARGE PRESSURE CAN BE CHANGED BY USING A HAND TIRE PUMP OR AN AIR PRESSURE
SOURCE FROM A GAS STATION.

IV. 6120 NEEDLE VALVE FEATURE:
6120 NEEDLE VALVE (9) IS USED TO REGULATE OR BALANCE THE PRESSURE INTO AND OUT OF

THE SENSING CHAMBER OF THE CPM-A (4) PRESSURE MANAGEMENT CONTROL. FOR NORMAL

OPERATION THE 6120 NEEDLE VALVE (9) IS ADJUSTED APPROXIMATELY 2 TURNS OUT. WHEN THE
6120 NEEDLE VALVE (9) IS TURNED ALL THE WAY IN, THE MAIN VALVE (1) WILL ONLY REGULATE
AT THE HIGH PRESSURE SET POINT OF THE CPM-A (4). WHEN THE 6120 NEEDLE VALVE (9) IS
ADJUSTED MORE THAN 5 TURNS OUT THEN THE MAIN VALVE (1) WILL ONLY REGULATE AT THE

LOW PRESSURE SET POINT OF THE CPM-A (4).

208358

2-03-11

PRESSURE MANAGEMENT CONTROL VALVE

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

2-08-11