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.

Boiler, flat station or heat pump in 1-family houses.

▪For balancing.

▪Shut-off function for service/repair.

All dimensions are available with internal thread.

Danfoss PFM 5000/100 measuring instruments contain valve data for LENO™ MSV-O in memory.

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

Fan coils		1-pipe system
▪	For flow verification.	▪	For balancing.
▪	Shut-off function for service/ repair.	▪	Shut-off function for service/repair.

Ordering	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	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
	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

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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	Before fitting the valve the installer must ensure
			DN	R1/R2 (mm)
	that the pipe system is clean and:
			15	96/58
	1.	the valve can be turned 360 degrees (if
			20	99/60
		threaded pipe is used).
	2.	the valve is fitted according to the flow di-	25	101/63
		rection arrow.	32	124/87
			40	127/90
	Removal of the handle		50	131/94
	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.

Shut-Off

Fixed Orifice

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.

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

Measuring Accuracy

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

Maximum error in measured flow [%]

Flow % of Kvs

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.

The red line indicates 25% of max. flow.

According to BS7350:1990 flow rates must be within following values:

±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.

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Data Sheet	Manual Presetting Valves LENO™ MSV-O

Kv-Signal	Kv-signal values are used for non-Danfoss meas-	∆p across the measuring nipples (kv-sig) and ∆p
	uring instruments. Danfoss PFM 3000*/4000 have	across the valve (kv-val) is not the same due to tur-
	all data in memory, and the instruments are using	bulence influence for pressure measuring.
	this formula:
		* with software 9.4 or higher

Kv-Signal Values	DN 15LF								DN 15				DN20						DN25					DN32					DN40					DN50
	0.356						1.434				3.453							5.80					10.33					14.72					22.94
Sizing
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Data Sheet	Manual Presetting Valves LENO™ MSV-O
Correction Factors
	Temp.				Correction factors,
			ethylene glycol / propylene glycol percentage (max. 30 %)
	°C
		25	30	40		50		60	65	100
	-40.0	1)	1)	1)		1)		0.89	0.88	1)
	-17.8	1)	1)	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	2)	2)	2)		2)		2)	2)	0.94

1) Below freezing point

2) Above boiling point

Valve Size and Presetting Example:

Example: Flow needed = 30 m³/h Flow after correction: 30 x 0.95 = 28 m³/h

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

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:

∆pi	Pressure drop across LENO™ MSV-O valve
∆pm	Pressure drop across valve
∆pr	Necessary pressure for the riser
∆pa	Available pressure for the riser

which corresponds to presetting 4.2 as shown on pages 7 and 11.

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Data Sheet	Manual Presetting Valves LENO™ MSV-O

Flow Diagrammes, DN 15 LENO™ MSV-O DN 15 LF

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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