Technical Brochure
Balancing valve,
fixed orifice
CALEFFI
130 series
01251/14 NA
ACCREDITED
ISO 9001
FM 21654
ISO 9001 No. 0003
Function
Caleffi 130 series low-lead brass manual balancing valves are used
to measure and adjust the fluid flow rate in hydronic or plumbing
circuits. The flow rate is directly determined from the pressure
differential (from Venturi effect) measured across the two test ports.
The valve design is “fixed orifice” with both pressure ports located
upstream of adjustment plug and away from any pressure variations
from turbulence as flow passes the adjustment plug – this feature
makes pressure measurements and thus flow determination simpler
and more accurate compared to “variable orifice” type balancing
valves. Flow rate is calculated by simple formula or by easy reference
to flow characteristic graph. Memory stop feature allows valve to be
closed, and later reopened to the original set position. Teflon stem
bearing guide prevents noise and vibration. The control stem threads
remain dry at all times, and thus are not prone to seizing from scale
after long in-operation periods. Stainless steel plug is highly resistant
to erosion from fluid impurities.
Product range
Fixed orifice balancing valve
sizes 1/2”, 3/4”, 1”, 1 1/4”, 1 1/2”, and 2" NPT female
Technical specifications
Performance
Suitable Fluids:
Max. percentage of glycol:
Max. working pressure:
Working temperature range:
Accuracy:
Number of adjustment turns:
Threaded connections:
water, glycol solutions
50%
232 psi (16 bar)
-4 - 250°F (-20–120°C)
±10%
6
1/2”– 2" FNPT
A
A
Materials
Valve
Body:
low-lead brass
Bonnet:
low-lead brass
Control stem:
low-lead brass
Valve plug:
stainless steel
Seal seat:
brass
Hydraulic seals:
EPDM
Stem guide bearing:
PTFE
Adjustment knob:
PA6G30
Pressure test ports:
low-lead brass body, EPDM seal elements
Reduction of Lead in Drinking Water Act Compliant: 0.25% Max.
weighted average lead content. Reduction of Lead in Drinking Water
Act Certified by IAPMO R&T.
C
Dimensions
D
PN N2
15 20 5
0
130 series
B
Code
A
B
C
Wt (lb)
130400A
1/2"
3"
4"
1
130500A
3/4"
3 1/4"
4"
1.2
130600A
1"
3 3/4"
4 1/4"
1.5
130700A
1 1/4"
4 1/2"
4 1/2"
2
130800A
1 1/2"
5"
4 3/4"
2.3
130900A
2"
6"
5 1/4"
2.5
Advantages of balanced circuits
Operating principle
Balanced circuits have the following principal benefits:
The 130 series balancing valve is a hydraulic device that controls
the flow rate of a fluid. Turning the knob moves a plug within
the fluid stream which varies the flow rate. The flow rate is
determined according to the pressure drop value measured by a
differential pressure meter connected to the pressure test ports.
1. In hydronic applications, the system emitters operate properly
saving energy and providing greater comfort.
2. In plumbing applications such as hot water recirculation, water is
not wasted when there is a call for hot water from a fixture.
3. Circuit pumps operate at maximum efficiency, reducing the risk of
overheating and excessive wear.
4. High fluid velocities which can result in noise, erosion and abrasion
are avoided.
5. The differential pressures acting on the circuit control valves are
reduced preventing faulty operation.
OPEN
CLOSE
BT OFF
RESET
ON OFF
OPEN
CLOSE
RESET
ON OFF
RESET
BT OFF
CLOSE
ON OFF
OPEN
BT OFF
Construction details
Venturi flow rate measurement device
Fast-coupling pressure test ports
As shown in the figure below, the 130 series balancing valve contains
two closely spaced pressure test ports located upstream of the valve
plug and at different cross sectional areas. As fluid flows through the
valve, the velocity at the port closest to the plug is greater than the
velocity at the port furthest. The result, referred to as the Venturi effect,
is an induced pressure differential across the ports.
The 130 series balancing valve has as standard probe type, fastcoupling pressure test ports. The probe from the differential pressure
meter is inserted into the port packing, until the end of the probe
enters the system. When the measuring probe is pulled out, the test
port automatically closes, preventing fluid leakage. Care should be
taken to pull the probe out slowly so as to allow adequate time for
the packing to re-seal – otherwise fluid can quickly escape creating a
hazardous situation. Consult differential pressure meter manufacturer
instructions for proper use of instrument and pressure port couplings.
Benefits:
1. Compared to variable orifice balancing valves, system balancing
can be quicker. In variable orifice balancing valves, one pressure test
port is located upstream and one downstream from the adjustment
plug, so as the valve is adjusted, the flow coefficient of the orifice
between the ports changes. Resultantly, to determine the flow rate,
an added step of visually estimating the orifice Cv is required and
introduces a factor of interpretation error in the balancing process
leading to potentially less precise results.
2. With variable orifice balancing valves, in low flow applications
requiring the valve to be closed more than 75% of full open,
downstream turbulence can cause an unstable pressure reading
signal which can result in measurement error. This effect is more
pronounced if fluid impurities are present. With the 130 balancing
valve with both ports upstream of the plug and away from turbulence
effects, there is better pressure signal stability and thus less chance
for pressure measurement error. There is also less sensitivity in the
presence of fluid impurities.
Safety
cap
Measuring
probe
Seal
Stainless steel valve plug (1)
Memory stop
High resistance to corrosion and erosion due to continual water flow or
impurities in fluid.
The 130 series balancing valve features a memory stop that allows the
valve to be reopened to the initial position if it has been closed for any
reason such as isolating components in the balanced circuit. Locking
the position to be memorized requires the use of a 2.5 mm hex key.
Teflon stem guide bearing (2)
Prevents noise and vibration - particularly in severe operating
conditions.
4
3
5
1
2
Double internal o-rings
Double O-rings (3) prevent water from coming in contact with the screw
thread (4), which allows the rod (5) to fine-tune the calibrated valve plug
position (1). In addition, the resulting dry control stem thread prevents
seizing from scale after long in-operation periods.
Adjustment knob
Insulation shells
The shape of the knob is designed to ensure maximum comfort for
the operator and an accurate adjustment. 6 full turns of rotation with
10 decimal graduations per rotation allows for precise valve adjustment. Shades of the scale indicator are large and clear allowing for
easy, accurate reading. The knob is made of a reinforced high strength
corrosion-resistant polymer.
The 130 series balancing valve can be supplied with optional insulation
shells, code CBN130xxxx series purchased separately, to minimize
heat loss or eliminate condensation in chilled water applications.
Adjustment reference scale
CBN130400A
Fits 1/2"
CBN130500A
Fits 3/4"
CBN130600A
Fits 1"
CBN130700A
Fits 1 1/4"
CBN130800A
Fits 1 1/2"
CBN130900A
Fits 2"
Each 360° rotation of the knob moves the turn indicator by one
position, ranging from 0 (valve closed) to 6 (valve fully open). A
geared drive (6) allows for decimal graduations of the scale situated
around the knob itself letting the flow rate to be finely tuned.
6
Code
Size
USING AND SETTING THE BALANCING VALVE
Measuring the flow rate
Connect a differential pressure gauge to the pressure test ports of the venturi of the valve. Read the Δp value on the gauge, Knowing this differential
pressure value and the flow coefficient of the Venturi orifice (which remains constant as valve knob is adjusted), the flow rate can be determined by
either referencing the flow characteristic chart in the figure below or by using the formula:
G= Cv ×
Δp
SG
where G is flow rate in gpm, Cv is the flow coefficient of the Venturi orifice, ∆p is the pressure differential in psi, and SG is the specific gravity of the
fluid. For example, let’s assume water is the fluid medium and the balancing valve used is item 130500A (3/4”). We see from the Venturi chart the Cv
value is 6.4. The specific gravity of water is 1.0. If the measured pressure differential is 0.3 psi, we can determine the flow rate G by substituting the
values into the above formula: G=6.4√(0.3/1.0) = 3.5 gpm. Alternatively, using the Venturi chart below, if we plot where the 0.3 psi value intersects
the ¾” graph, and drop a line vertically to where it intersects the gpm axis, we can estimate the value to be 3.5 gpm.
Setting the flow rate manually
To manually adjust the flow rate through the valve, reposition the adjustment knob until the differential pressure indicated by the measuring device
corresponds to the desired flow rate value on the Venturi chart for the valve being used. Or, calculate the pressure drop of the venturi using the
following:
G2
Δp Venturi =
2
Cv Venturi
Next, turn the adjustment knob until the theoretical Δp value calculated using the formula above is reached.
Correcting for fluids with a different density
This applies to fluids with viscosities of water and glycol mixtures or less. If using fluids with a specific gravity different from water at 70˚ F (20˚ C)
(SG=1.0), correct the value of the pressure drop Δp measured using the following formula:
Δp' = Δp x (SG')
where: Δp' = reference pressure drop in psid (kPa) and SG' = non-water specific gravity.
Example: 50% propylene glycol has a specific gravity of 1.0366 at 70˚ F (20˚ C). To measure a flow rate of 3.5 gpm across the fixed venturi for a
fluid with SG=1.0366, the pressure to read on the differential pressure metering device is calculated as Δp' = 0.3 x (1.0366) = 0.3108 psid.
Venturi chart (water)
∆p (feet of head)
1/2 “
Valve size
3/4“
(psi)
1“ 1 1/4“ 1 1/2“ 2“
(bar)
20
46.00
1.0
10
20.00
5
4
3
10.00
9.00
7.00
5.00
0.5
0.4
0.3
0.2
2
0.1
3.00
1
2.00
1.50
0.70
0.5
0.4
0.3
0.50
0.2
1.00
0.05
0.04
0.03
0.02
0.01
0.30
0.1
0.20
2 00
12.5
0.05
G
(l/s) (gpm )
100
5.6
7.0
50
2.8
20
1.4
.70
.50
5
.20
.30
1
.06
2
0.5
.03
.10
0.3
3.5 gpm
.02
.015
0.2
0.11
10
0.005
0.003
Size
Cv
Venturi
1/2"
3.25
3/4"
6.40
1"
11.20
1 1/4"
17.65
1 1/2"
23.80
2"
32.78
USING AND SETTING THE BALANCING VALVE
Presetting
The 130 series balancing valve features highly graduated adjustment which facilitates pre-setting. In commercial balancing applications where multiple
balancing valves are used, significant labor time can be saved in the balancing process if in advance of being installed, the valves are pre-set to the
expected knob position value. To pre-set, the anticipated pressure drop across the valve is required. For example, if balancing valve item 130500A
(3/4”), water is the fluid, and it has been calculated that a pressure drop of 1.5 psi across the valve will result in a flow rate of 3.5 gpm in the circuit,
we can see from the chart below that the knob value should be preset to a value between 2.5 and 3.0 with interpolation indicating approximately
position 2.9.
Code 130400A 1/2 inch
∆p (feet of head)
Position
Code 130500A 3/4 inch
4.5
3.5 6
1 1.5 2 2.5 3 4 5
.5
(psi)
(bar)
20
46.00
∆p (feet of head)
1.0
46.00
0.5
0.4
0.3
20.00
Position
.5 1 1.5
4.5
3.5
6
2.5 3 4 5
2
(psi)
1.0
10
0.02
2.5
3
3.5
4
4.5
1.24
1.6
2.28
2.7
3.0
3.24
3.43
6
3.55
3.68
2 00
G
(l/s) (gpm )
100
50
2
1.32
1.83
2.53
3.23
3.85
4.33
4.6
4.82
5.19
(psi)
(bar)
12.5
.20
.30
1.1
0.5
0.4
0.3
5
4
3
10.00
9.00
7.00
5.00
0.2
2
0.1
3.00
1
2.00
1.50
0.70
0.5
0.4
0.3
0.50
0.2
1.00
0.11
0.02
0.1
0.005
.015
2 00
0.20
0.003
0.05
0.04
0.03
0.01
0.30
0.005
G
(l/s) (gpm )
2 00
1.0
10
Cv
Max
Position
20
20.00
12.5
100
50
5.6
7.0
1.4
2.8
20
10
.70
.50
0.05
4.5
3.5
6
4 5
46.00
0.2
0.20
0.11
2 2.5 3
1.5
0.05
0.003
G
(l/s) (gpm )
0.1
1
12.5
0.01
0.30
.5
100
0.02
Position
5.6
7.0
0.2
0.05
0.04
0.03
∆ p (feet of head)
50
0.50
1.00
5
.85
2.8
0.70
0.5
0.4
0.3
2
6
Cv
Cv
Max
20
0.2
0.1
.20
.30
5
1.4
0.5
0.4
0.3
1
2.00
1.50
1
4.5
10
(bar)
20
3.00
.06
4
.70
(psi)
2
.10
3.5
.50
6
5
4
3
0.5
3
Position
5
5
10.00
9.00
7.00
5.00
.03
2.5
2
4.5
4
1.0
0.3
2
.20
.30
3.5
10
0.2
1.5
1
2 2.5 3
.5 1 1.5
20.00
.02
1
Code 130700A 1 1/4 inch
46.00
.015
0.5
.06
Position
Size 3/4"
.10
Code 130600A 1 inch
∆p (feet of head)
1
0.2
.015
5
0.003
2.8
2
0.05
1.4
1.5
0.5
1.03
3.5 gpm
.03
.76
0.005
0.11
0.3
Cv
1
0.20
.02
0.5
0.02
0.1
Cv
Max
Position
Size 1/2"
0.003
0.05
0.04
0.03
0.01
0.30
.06
2 00
12.5
0.05
G
(l/s) (gpm )
100
2.8
1.4
50
5.6
7.0
20
10
.70
5
.50
2
.20
.30
1
.06
.10
0.3
0.5
.03
0.2
.015
.02
0.11
0.2
5.6
7.0
0.005
0.50
20
0.1
0.20
0.70
10
0.01
0.30
0.5
0.4
0.3
.10
0.2
1.00
0.1
1
0.3
0.50
2.00
1.50
0.5
0.70
0.5
0.4
0.3
1.00
1.5 psi
3.00
0.05
0.04
0.03
.70
1
2.00
1.50
0.2
2
5
0.1
3.00
.50
0.2
2
0.5
0.4
0.3
5
4
3
10.00
9.00
7.00
5.00
.03
5
4
3
10.00
9.00
7.00
5.00
10
.02
20.00
(bar)
20
Cv
Max
Position
Size 1"
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
6
Size 1 1/4"
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
6
Cv
1.08
1.38
1.76
2.4
3.0
3.83
4.5
5.36
6.15
7.1
8.87
Cv
1.76
2.87
3.7
4.9
5.7
7.24
8.31
9.62
10.65
12.06
14.07
Code 130800A 1 1/2 inch
∆p (feet of head)
.5
Position
46.00
Code 130900A 2 inch
4.5
3.5
6
4 5
2 2.5 3
1 1.5
(psi)
(bar)
20
1.0
∆p (feet of head)
Position
1 1.5 2 2.5 3
.5
3.5
4.5
4
5
6
(psi)
1.0
10
0.5
0.4
0.3
5
4
3
0.2
2
0.1
1
0.05
0.04
0.03
2.00
1.50
0.02
0.70
0.5
0.4
0.3
0.50
0.2
0.01
19.76
0.2
.015
12.5
.70
.50
.20
.30
.10
2 00
16.02
0.05
Cv
Max
Position
Size 2"
Cv
0.003
G
(l/s) (gpm )
13.68
12.5
12.3
100
9.97
50
8.72
5.6
7.0
6.94
2.8
5.75
20
4.07
1.4
3.24
10
1.89
Cv
Max
.70
Cv
5
6
0.005
0.11
.50
5
0.20
2
4.5
G
(l/s) (gpm )
4
Position
0.02
0.1
.20
.30
100
3.5
5.6
7.0
3
50
2.8
2.5
20
1.4
2
10
1.5
5
1
2
1
.06
0.3
0.5
0.5
.02
.03
0.003
Size 1 1/2"
.015
0.2
2 00
0.005
0.05
0.05
0.04
0.03
0.01
0.30
0.1
0.11
1.00
1
0.30
0.20
1
.06
0.2
0.1
3.00
.10
0.50
0.2
2
0.3
0.70
0.5
0.4
0.3
1.00
0.5
0.4
0.3
5
4
3
10.00
9.00
7.00
5.00
0.5
3.00
2.00
1.50
20.00
.03
10.00
9.00
7.00
5.00
10
.02
20.00
(bar)
20
46.00
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
6
3.10
4.86
6.19
8.46
10.7
13.14
15.35
18.48
21.16
24.53
30.58
Application diagrams
To control the flow rate that flows to each riser.
To control the flow rate supplying each emitter.
To balance potable water distribution circuits.
To balance zone branches in circuits with three-way
valves.
To balance circuts that supply the coils of air handling units.
GR1
GR2
GR1
GR2
To balance circuits that supply cooling unit evaporators or
condensers.
To balance circuits that supply cooling towers.
To balance the various substations in district heating
systems.
s
s
To balance the by-pass line in circuits for temperature
control.
To balance primary/secondary coupled circuits.
SPECIFICATION SUMMARIES
130 series
Balancing valve with fixed (venturi) orifice. Threaded connections 1/2”, 3/4", 1", 1-1/4", 1-1/2", 2" NPT Female by Female. Low-lead brass
body, bonnet and control stem (< 0.25% lead content) certified by IAPMO R&T. Stainless steel valve plug. PTFE stem guide bearing.
Brass seal seat. EPDM hydraulic seals. PA6G30 adjusting knob with memory stop. Pressure test ports with low-lead brass body and
EPDM seal elements. Water and glycol solutions. Maximum percentage of glycol 50%. Maximum working pressure 232 psi (16 bar).
Working temperature range -4 to 250 deg F (-20 to 120°C). Number of adjustment turns: 6. Accuracy ± 10%. Pre-formed insulation shells
available for field installation.
We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice.
Caleffi North America, Inc.
3883 W. Milwaukee Road
Milwaukee, WI 53208
Tel: 414-238-2360 · Fax: 414-238-2366
[email protected] · www.caleffi.com/usa/en-us
© Copyright 2014 Caleffi North America, Inc.
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement