Danfoss LENO MSV-O Data sheet
Data Sheet
Manual Presetting Valves LENO™ MSV-O
Description
Application
LENO™ MSV-O is a new generation of manual
valves for balancing flow in heating, cooling and
domestic hot water systems.
LENO™ MSV-O is a combined presetting and shut
off valve with a range of unique features:
Fixed venturi orifice.
▪
Removable hand wheel for easy mounting.
▪
Numeric presetting scale, visible from more
▪
angles.
Easy locking of presetting.
▪
Built-in measuring nipples for 3mm needles.
▪
Open-close with Allen key in emergency.
▪
Open-closed colour indicator.
▪
It is recommended to use LENO™ MSV-O in constant flow systems in front of boilers, flat stations
or heat pumps in one-family houses for balancing, shut-off function for service and repair, flow
verification, one pipe systems. The valve may be
mounted in flow or return.
All dimensions are available with internal thread.
Danfoss PFM 5000/100 measuring instruments
contain valve data for LENO™ MSV-O in memory.
Boiler, flat station or heat pump in 1-family houses.
For balancing.
▪
Shut-off function for service/repair.
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Air handling unit
For constant flow.
▪
For balancing.
▪
Shut-off function for service/ repair.
▪
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Data Sheet Manual Presetting Valves LENO™ MSV-O
Ordering
Fan coils
For flow verification.
▪
Shut-off function for service/ repair.
▪
LENO™ MSV-O valve with internal thread
Type Material Size kvs (m³/h) Connection Code no.
DN 15 LF 0.63 Rp ½" 003Z4020
DN 15 2.8 Rp ½" 003Z4021
DN 20 5.7 Rp ¾" 003Z4022
DZR* Brass
Accessories
Type Code no.
Standard measuring nipples, 2 pcs. 003Z4662
Extended measuring nipples, 60 mm, 2 pcs. 003Z4657
Operating handle 003Z4652
Flow measuring instrument PFM 100 003L8260
Flow measuring instrument PFM 5000, PN10 003L8331
Flow measuring instrument PFM 5000 Multi Source, PN10 003L8333
Identification tag & strips, 10 pcs. 003Z4660
DN 25 9.7 Rp 1" 003Z4023
DN 32 16.6 Rp 1¼" 003Z4024
DN 40 25.4 Rp 1½" 003Z4025
DN 50 37.9 Rp 2" 003Z4026
1-pipe system
For balancing.
▪
Shut-off function for service/repair.
▪
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Data Sheet Manual Presetting Valves LENO™ MSV-O
Design
1. Valve house 6. Closing bush 11. Release lever
2. Ball 7. Valve top 12. Rotation lock
3. Ball seat 8. Spindle head 13. Measuring nipple
4. Suppert screw 9. Spindle 14. Venturi
5. Throttle 10. Handle 15. Suppert screw with venturi
Technical Data
Materials and parts in contact with water
Valve body DZR brass
O-rings EPDM
Ball Brass/chromium plated
Ball sealing Teflon
Max. static working pressure 20 bar
Static test pressure 30 bar
Max. differential pressure across valve 2.5 bar (250 kPa)
Max. flow temperature 120 °C
Min. temperature -20°C
Cooling liquids Ethylene glycol / propylene glycol and HYCOOL (max. 30 %)
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Data Sheet Manual Presetting Valves LENO™ MSV-O
Fitting
Shut-Off
Before fitting the valve the installer must ensure
that the pipe system is clean and:
1. the valve can be turned 360 degrees (if
threaded pipe is used).
2. the valve is fitted according to the flow direction arrow.
Removal of the handle
1. Set the handle at 0/0.
2. Release the setting lock (green).
3. Unscrew the union nut.
Calibration of the handle
Before refitting, ensure that the handle setting is
0/0.
In order to shut-off the valve the handle must be
pressed down.
The shut-off function features a ball valve, which
only requires a 90 degree turn to shut the valve
completely.
DN
15 96/58
20 99/60
25 101/63
32 124/87
40 127/90
50 131/94
R1/R2 (mm)
Fixed Orifice
An indicator window shows the actual setting:
red = closed
▪
white = open
▪
LENO™ MSV-O has a fixed venturi orifice in the
valve body with constant kvs-value. This feature
makes it possible to read flow on the measuring
device, without typing in presetting.
This feature saves time for commissioning for
each valve installed.
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Data Sheet Manual Presetting Valves LENO™ MSV-O
Setting and Locking
Measuring
The valve has a built-in presetting feature for accurate flow ratings.
Setting the required flow is made in 5 steps:
1. Release the lock using the green lever or a 3
mm Allen key.
2. The handle pops up automatically.
The flow through the LENO™ MSV-O valve can be
measured using Danfoss PFM 5000/100 or other
brands of measuring instruments.
The LENO™ MSV-O valve is supplied with two
measuring nipples for 3 mm needles. A twin
bracket enables the user to connect both needles
simultanously.
Procedure for flow measuring:
1. Select flow measuring
2. Select valve brand
3. Select valve type and dimension
4. Connect valve and instrument
5. Calibrate static pressure
6. Measure the flow
3. The calculated value can now be set.
4. The setting is locked when the handled is
pressed to click.
5. Seal - the setting can be protected by using
a strip as shown.
Measuring Accuracy
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Maximum error in
measured flow [%]
Flow % of K
The red line indicates 25% of max. flow.
According to BS7350:1990 flow rates must be within
following values:
vs
± 18 % at 25 % open position
± 10 % at fully open position
LENO™ MSV-O is very accurate, due to the separate functions for presetting and shut-off.
Danfoss
3Z47.10
Data Sheet Manual Presetting Valves LENO™ MSV-O
Kv-Signal
Kv-Signal Values
Sizing
Kv-signal values are used for non-Danfoss measuring instruments. Danfoss PFM 3000*/4000 have
all data in memory, and the instruments are using
∆p across the measuring nipples (k
across the valve (k
) is not the same due to tur-
v-val
bulence influence for pressure measuring.
this formula:
* with software 9.4 or higher
DN 15LF DN 15 DN20 DN25 DN32 DN40 DN50
0.356 1.434 3.453 5.80 10.33 14.72 22.94
v-sig
) and ∆p
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Data Sheet Manual Presetting Valves LENO™ MSV-O
Correction Factors
Valve Size and Presetting
Temp.
°C
-40.0
-17.8
ethylene glycol / propylene glycol percentage (max. 30 %)
25 30 40 50 60 65 100
1) 1) 1) 1)
1) 1)
Correction factors,
0.89 0.88
0.93 0.91 0.90 0.89 0.86
4.4 0.95 0.95 0.93 0.92 0.91 0.90 0.87
26.6 0.96 0.95 0.94 0.93 0.92 0.91 0.88
48.9 0.97 0.96 0.95 0.94 0.93 0.92 0.90
71.1 0.98 0.98 0.96 0.95 0.94 0.94 0.95
93.3 1.00 0.99 0.97 0.96 0.95 0.95 0.92
115.6
1)
Below freezing point
2)
Above boiling point
2) 2) 2) 2) 2) 2)
Example: Flow needed = 30 m³/h
Flow after correction:
30 x 0.95 = 28 m³/h
Example:
MSV-O
Given
Max. pipe flow Q = 2.0 m³/h
∆pr= 15 kPa
∆pa= 45 kPa
∆pm= 10 kPa
∆pi= ∆pa – ∆pv – ∆pm
∆pi= 45 kPa – 15 kPa – 10KPa = 20 kPa
1)
0.94
Correct valve size and presetting is found in flow
diagramme, page 7.
Q= 2.0 m³/h and ∆pi = 20 kPa
On page 11 intersect guides and presetting is
found to be 4.2 (DN 20 valve)
Setting can be also calculated from the formula:
which corresponds to presetting 4.2 as shown on
pages 7 and 11.
∆piPressure drop across LENO™ MSV-O valve
∆pmPressure drop across valve
∆prNecessary pressure for the riser
∆paAvailable pressure for the riser
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Data Sheet Manual Presetting Valves LENO™ MSV-O
Flow Diagrammes, DN 15
LF
LENO™ MSV-O DN 15 LF
Flow [m³/h] Setting
Setting DN15LF
0.5 0.11
0.6 0.12
0.7 0.13
0.8 0.15
0.9 0.16
0.10 0.18
1.1 0.19
1.2 0.21
1.3 0.23
1.4 0.25
1.5 0.27
1.6 0.28
1.7 0.30
1.8 0.32
1.9 0.34
2.0 0.36
2.1 0.38
2.2 0.40
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