Page 1
20-01
3
2
2
1
S
Y
F
IND. OPER.
PRESSURE
PORT "B"
PORT "A"
B
D
4
1
INLET OUTLET
A
MODEL
(Full Internal Port)
620-01
(Reduced Internal Port)
Blending Valve for
Water Softening Systems
The Cla-Val 20-01/620-01 Blending Valve is used in systems for controlling the flow of one fluid in relation to another. It operates to maintain
a pre-set percentage of one fluid to the other regardless of fluctuating
demands on the blend.
The valve is a hydraulically operated, pilot controlled, diaphragm type.
It is operated by line pressure and responds to commands from the pilot
control. It maintains equal pressure at two sensing points, one in each
line of fluid being blended. With a restriction in each line between the
blending point and the sensing point, a flow rate in direct proportion to
the capacities of the restrictions will be maintained. By capacity adjustment of one or both restrictions, the percentage of one fluid to the other
is adjusted. For sizes 1/2", 3/4", and 1" refer to Cla-Val 20-02.
Schematic Diagram
Item Description
1 Cla-Val 100-01 (Globe or Angle)
2 CDH2 Differential Control
3 CNA Needle Valve
4 X101 Position Indicator
Optional Features
Item Description
A X46 Flow Clean Strainer
B CK2 Shutoff Isolation Valve-Isolates Pilot System
F Omit Pilot Line To Inlet-Connects To
Independent Operating Pressure
Y X43 "Y" Strainer
Specifications
Size
End Details
Pressure Ratings
Temperature Range
Material
1-1/4” - 3” Threaded
1-1/2” - 8” Flanged
125 Class and 250 ANSI B16.1
125 Class - 175 psi Max.
250 Class - 300 psi Max.
Water: to 180º F. Max.
Petroleum Products: - 40º to180º F. Max.
Main valve body and cover:
Ductile Iron ASTM A 536
Main valve trim:
Bronze ASTM B61
303 or 316 Stainless Steel
Pilot control system:
Bronze ASTM B61 with
303 Stainless Steel trim and Monel
Other materials available:
Cast Steel, Bronze, Aluminum
Purchase Specifications
The blending valve shall be a pilot controlled hydraulically
operated diaphragm type globe valve with single seated
composition disc. It shall be operated by line pressure and
respond to commands from the pilot control. In a blending
system, the valve shall operate to maintain the flow rate of
one fluid in direct proportion to the flow rate of another fluid.
It shall maintain the same percent of one fluid to the other in
the blend regardless of variable system inlet pressures or
variable demands on the blend. It shall automatically adjust
the percent 01 one of the fluids in the blend, in response to
any setting of an adjustable restriction in the line being proportioned.
Page 2
Operations
FIXED ORIFICE
OR RESTRICTION
R1
BLENDING POINT
SUPPLY LINE NO. 1
LOW PRESSURE
S
A
SENSING
C
BLENDED PRODUCT
VARIABLE DEMAND
R2
THROTTLING
VALVE
LINES
D
A
2
B
CLA-VAL 20-01
SUPPLY LINE NO. 2
BLENDING VALVE
HIGH PRESSURE
1. Pressure at B is maintained equal to pressure at A within ±6 inches water pressure. This is accomplished by modulation of the
20-01 valve installed in the hi-pressure line.
2. With pressure at B maintained equal to pressure at A, the differential pressure between B and C will be equal to the
differential pressure between A and C.
3. Flow rate through secondary restriction R2 will be maintained in relation to the flow rate through primary restriction R1. The
proportional flow ratios will be directly rated to the capacities of restriction R1 and R2.
4. Primary restriction at R1 can be fixed as shown, or can be adjustable the same as the secondary restriction at R2.
If the primary restriction at R1 is to be fixed, it must be calibrated in relation to two things:
A. Accuracy required at Minimum Flow Rate.
B. Systems allowable pressure loss at Maximum Flow Rate.
For example: Excellent control will result within approximately ±5% accuracy when a 60" water differential is created across the
fixed restriction (R1).As the flow across this restriction increases, the accuracy (in % of flow) also increases. As the flow across the
restriction (R1) decreases, the accuracy (in % of flow) slightly decreases.
Therefore, where accuracy of ±5% or less is required over a wide flow range, at least a 60" water differential should be created
across the fixed restriction (R 1) at the lowest flow rate. In sizing the adjustable restriction (R2), consideration must be given to two
things:
A. Ratio of blend (flow through R2 as compared to flow through R1).
B. Differential across R1.
To obtain a blend ratio of 1 to 1, the differential created by R2, when adjusted to "full open", must not be more than the differential
created by R1 when passing an equal flow.
Where the blend ratio requires less flow at R2 than at R1, the differential created by R2 at "full open" can be proportionally more
than the differential created by R1 at an equal flow rate.
Where the blend ratio requires more flow at R2 than at R1, the differential created by R2 at "full open" must be proportionally less than
the differential created by R1 at an equal flow rate.
Page 3
Pressure Ratings
GGGG
DDDD
Inlet
AAAA
X
100-01
Grooved
EE
CC
(MAX)
K
J
H
Inlet
Outlet
B
(Diameter)
Y
Z
EE
D
E
Inlet
DD
AA
X
100-20
Flanged
F
A
C
(MAX)
K
J
H
Inlet
Outlet
FF
B
(Diameter)
Valve Body & Cover
Grade Material
(Recommended Maximum Pressure - psi)
Pressure Class
Flanged Grooved Threaded
ANSI
Standards*
150
Class
300
Class
300
Class
End‡
Details
ASTM A536 Ductile Iron B16.42 250 400 400 400
ASTM A216-WCB Cast Steel B16.5 285 400 400 400
ASTM B62 Bronze B16.24 225 400 400 400
Note: * ANSI standards are for flange dimensions only.
Flanged valves are available faced but not drilled.
‡ End Details machined to ANSI B2.1 specifications.
Valves for higher pressure are available; consult factory for details
(Diameter)
100-01
Threaded &
H
Inlet
B
Flanged
J
K
C
(MAX)
X
Outlet
Materials
Component Standard Material Combinations
Body & Cover Ductile Iron Cast Steel Bronze
100-01 Available Sizes 1" - 8" 1" - 8" 1" - 8"
100-20 Available Sizes 3" - 10" 3" - 10" 3" - 10"
Disc Retainer &
Diaphragm Washer
Trim: Disc Guide,
Seat & Cover Bearing
Disc Buna-N
Diaphragm Nylon Reinforced Buna-N
Stem, Nut & Spring Stainless Steel
For material options not listed, consult factory.
Cla-Val manufactures valves in more than 50 different alloys.
Cast Iron Cast Steel Bronze
Bronze is Standard
Stainless Steel is Optional
®
Rubber
®
Rubber
G
GG
E
F
FF
GGG
Inlet
A
AA
AAA
Model 100-01 Dimensions
Valve Size (Inches)
A Threaded
AA 150 ANSI
AAA 300 ANSI
AAAA Grooved End
B Dia.
C Max.
CC Max. Grooved End
D Threaded
DD 150 ANSI
DDD 300 ANSI
DDDD Grooved End
E
EE Grooved End
F 150 ANSI
FF 300 ANSI
G Threaded
GG 150 ANSI
GGG 300 ANSI
GGGG Grooved End
H NPT Body Tapping
J NPT Cover Center Plug
K NPT Cover Tapping
Stem Travel
Approx. Ship Wt. Lbs.
X Pilot System 11 11 11 13 14 15 17 29 31
Y Pilot System 99991011122022
Z Pilot System 99991011122022
Model 100-20 Dimensions
Valve Size (Inches)
A 150 ANSI
AA 300 ANSI
B Dia.
C Max.
D 150 ANSI
DD 300 ANSI
E 150 ANSI
EE 300 ANSI
F 150 ANSI
FF 300 ANSI
H NPT Body Tapping
J NPT Cover Center Plug
K NPT Cover Tapping
Stem Travel
Approx. Ship Wt. Lbs.
X Pilot System 13 15 27 30 33
Y Pilot System 10 11 18 20 22
Z Pilot System 10 11 18 20 22
DDD
D
DD
(Full Internal Port)
(In Inches)
11 1/4 1 1/2 22 1/2 3468
7.25 7.25 7.25 9.38 11.00 12.50 — — —
— — 8.50 9.38 11.00 12.00 15.00 20.00 25.38
— — 9.00 10.00 11.62 13.25 15.62 21.00 26.38
— — 8.50 9.00 11.00 12.50 15.00 20.00 25.38
5.62 5.62 5.62 6.62 8.00 9.12 11.50 15.75 20.00
5.50 5.50 5.50 6.50 7.56 8.19 10.62 13.38 16.00
— — 4.75 5.75 6.88 7.25 9.31 12.12 14.62
3.25 3.25 3.25 4.75 5.50 6.25 — — —
— — 4.00 4.75 5.50 6.00 7.50 10.00 12.69
— — 4.25 5.00 5.88 6.38 7.88 10.50 13.25
— — — 4.75 — 6.00 7.50 — —
1.12 1.12 1.12 1.50 1.69 2.06 3.19 4.31 5.31
— — 2.00 2.50 2.88 3.12 4.25 6.00 7.56
— — 2.50 3.00 3.50 3.75 4.50 5.50 6.75
— — 3.06 3.25 3.75 4.13 5.00 6.25 7.50
— 1.88 1.88 3.25 4.00 4.50 — — —
— — 4.00 3.25 4.00 4.00 5.00 6.00 8.00
— — 4.25 3.50 4.31 4.38 5.31 6.50 8.50
— — — 3.25 — 4.25 5.00 — —
.375 .375 .375 .375 .50 .50 .75 .75 1
.25 .25 .25 .50 .50 .50 .75 .75 1
.375 .375 .375 .375 .50 .50 .75 .75 1
0.4 0.4
15 15 30 50 65 85 160 300 520
(Reduced Internal Port)
0.4 0.6 0.7 0.8 1.1 1.7 2.3
(In Inches)
3 4 6 8 10
10.25 13.88 17.75 21.38 26.00
11.00 14.50 18.62 22.38 27.38
6.62 9.12 11.50 15.75 20.00
7.00 8.62 11.62 15.00 17.88
— 6.94 8.88 10.69 Consult Factory
— 7.25 9.38 11.19 Consult Factory
— 5.50 6.75 7.25 Consult Factory
— 5.81 7.25 7.75 Consult Factory
3.75 4.50 5.50 6.75 8.00
4.12 5.00 6.25 7.50 8.75
.375 .50 .75 .75 1
.50 .50 .75 .75 1
.375 .50 .75 .75 1
0.6 0.8 1.1 1.7 2.3
85 160 300 520 645
Page 4
20-01
Valve
Selection
100-01 Pattern: Globe (G), Angle (A), End Connections: Threaded (T), Grooved (GR), Flanged (F) Indicate Available Sizes
Inches 1 11⁄4 11⁄2 2 21⁄2 3 4 6 8
mm 25 32 40 50 65 80 100 150 200
Basic Valve
100-01
Suggested
Flow
(gpm)
Suggested
Flow
(Liters/Sec)
100-01 Series is the full internal port Hytrol. For Lower Flows Consult Factory *Globe Grooved Only
620-01
Valve
Selection
Basic Valve
100-20
Suggested
Flow
(gpm)
Pattern
End Detail T T
Maximum
Minimum
Maximum
Minimum
Inches 3 4 6 8 10
mm 80 100 150 200 250
Pattern
End DetailFFFFF
Maximum
Minimum
G, A G, A G, A G, A G, A G, A G, A G, A G, A
T, F,
Gr*
55 55 75 120 180 270 480 1100 1900
11112241015
3.5 3.5 5 8 11 17 30 69 120
.03 .03 .03 .06 .09 0.13 0.25 0.63 0.95
100-20 Pattern: Globe (G), Angle (A), End Connections: Flanged (F) Indicate Available Sizes
G G, A G, A G, A G
120 270 480 1100 1900
T, F,
Gr
T, F,
Gr*
T, F,
Gr
Gr
F,
F,
Gr*
F,
Gr*
1 2 4 10 15
Suggested
Flow
(Liters/Sec)
100-20 Series is the reduced internal port size version of the 100-01 Series. For Lower Flows Consult Factory
Maximum
Minimum
8 173069120
.06 .13 .25 .63 .95
Typical Applications
When Ordering, Please Specify
RAW WATER INFLUENT
CLA-VAL 20-01
BENDING VALVE
ADJUSTABLE
RESTRICTION
R2
BLENDED
C
TUBE
LINE
B
BLENDING
POINT
TUBE
LINE
A
SOFT EFFLUENT
R1
FIXED ORIFICE
OR RESTRICTION
SOFTENER
TANK
1. Catalog No. 20-01 or No. 620-01
2. Valve Size
3. Pattern - Globe or Angle
4. Pressure Class
5. Threaded or Flanged
6. Trim Material
7. Adjustment Range
8. Desired Options
9. When Vertically Installed
CLA-VAL
P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: 949-722-4800 • Fax: 949-548-5441 • E-mail: claval@cla-val.com • Website cla-val.com
©
Copyright Cla-Val 2012 Printed in USA Specifications subject to change without notice.
E-20-01/620-01 (R-3/2012)
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