Cla-Val 98-06/698-06 Technical Manual - Manual (Page 3)

OPERATING DATA
C
A
D
R
EV
IS
IO
N
R
EC
O
R
D
-
D
O
N
O
T
R
EV
IS
E
M
A
N
U
A
LL
Y
LT
R
SE
E
SH
EE
T
1
D
ES
C
R
IP
TI
O
N
BY
D
A
TE
SHEET 2 OF 5 DIST. CODE 002 CVCL 1 2 3 4
REV DRAWING NO.
98-06/698-06
CATALOG NO.
TYPE OF VALVE AND MAIN FEATURES
APV'D
CHK'D
DRAWN
DESIGN
BF
I. PRESSURE MANAGEMENT FEATURE:
CPM-A PRESSURE MANAGEMENT CONTROL (4) IS A NORMALLY OPEN CONTROL THAT RESPONDS TO
CHANGE IN DOWNSTREAM DEMAND. DOWNSTREAM PRESSURE IS MANAGED BETWEEN HIGH AND
LOW FLOW SYSTEM CONDITIONS. WHEN SYSTEM DEMAND IS NORMAL OR HIGHER THAN NORMAL,
THE PRESSURE MANAGEMENT CONTROL (4) MAINTAINS DOWNSTREAM PRESSURE AT THE HIGH
PRESSURE SET POINT. AN INCREASE IN OUTLET PRESSURE CLOSES CONTROL (4) AND A DECREASE IN
OUTLET PRESSURE OPENS CONTROL (4). THIS CAUSES THE MAIN VALVE (1) COVER PRESSURE TO VARY
AND THE MAIN VALVE (1) MODULATES (OPENS AND CLOSES) MAINTAINING THE DOWNSTREAM
PRESSURE AT THE HIGH SET POINT.
WHEN SYSTEM DEMAND DECREASES BELOW NORMAL DEMAND, CONTROL (4) RESPONDS BY
GRADUALLY LOWERING THE DOWNSTREAM PRESSURE UNTIL IT REACHES THE LOW PRESSURE SET
POINT. AS SYSTEM FLOW CHANGES BETWEEN THE LOW AND HIGH PRESSURE SET POINTS, CONTROL
(4) CLOSES OR OPENS ACCORDINGLY. THIS CAUSES THE MAIN VALVE (1) COVER PRESSURE TO
VARY AND THE MAIN VALVE (1) MODULATES (OPENS AND CLOSES) MAINTAINING THE
DOWNSTREAM PRESSURE AT EITHER THE LOW OR HIGH PRESSURE SET POINT.
CPM-A PRESSURE MANAGEMENT CONTROL (4) ADJUSTMENT:
TWO METHODS OF ADJUSTMENT ARE POSSIBLE FOR THE PRESSURE MANAGEMENT CONTROL (4).
METHOD I IS THE MOST ACCURATE ADJUSTMENT METHOD AND REQUIRES THE ABILITY TO HAVE A
MEANS TO ADJUST SYSTEM FLOW RATES DURING THE ADJUSTMENT PROCESS. A GATE VALVE
DOWNSTREAM OF THE MAIN VALVE IS AN ACCEPTABLE DEVICE FOR APPROXIMATING THE
LOW FLOW CONDITION. METHOD II IS INTENDED FOR USE IF AN APPROXIMATION OF THE
PRESSURE SPAN ADJUSTMENT (LOW PRESSURE SET POINT) IS ACCEPTABLE AND THERE IS NOT A
PRACTICAL MEANS TO VARY SYSTEM FLOW DURING THE ADJUSTMENT PROCEDURE.
METHOD I:
SYSTEM FLOW SHOULD BE EQUAL TO OR SLIGHTLY GREATER THAN THE NORMAL EXPECTED
SYSTEM FLOW AT THE START OF THE ADJUSTMENT PROCEDURE.
1. ISOLATION VALVE (6B) IS CLOSED. 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 (LP = HP).
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 VALVE (6A).
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).
208358 A
2-03-11 PRESSURE MANAGEMENT CONTROL VALVE
WITH X58E & ACCUMULATOR (SIZES 2" - 10")
VL
CH
2-08-11
2-08-11