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Application A5-01 BC

Principle diagram of compressed air on the floors

Product overview

Actuators

Actuator types

Digital NM24-MFT2 AM24-MFT2AM24LON

Standard 1-wire LR24(-S)LR230(-S)

NR230-1

3-point NR24-3NR230-3

Fast running NMQ24

Emergencycontrol function

LF24(-S)LF230(-S)

AFR24(-S)AFR230(-S)

Valves

Valve types DN kvs

R215 15 8.6

R220 20 16

R225 25 26

R230 30 16

R232 32 32

R240 40 32

R250 50 49

BELIMO ball valve in a compressed air application

(e.g. R225 with NM rotary actuator)

Task

To reduce compressed air leakage lossesin the manufacturing process

Pneumatic devices aid and simplify a widevariety of manufacturing steps. The productionof the necessary compressed air involves con-siderable costs. The compressed air is storedin pressure vessels. At times when there is noneed for the compressed air (e.g. end of pro-duction), the pneumatic devices have a certainleakage rate and the vessel either loses pres-sure, or the compressor starts filling up thepressure vessel again.

SolutionThe solution is to seal the pressure vesselusing a suitable shut-off control device thatallows no air bubbles to escape. VariousBELIMO ball valves with a choice of rotaryactuators are available for this purpose. Thecriteria for the design are either the existingpipe dimensions, or the effective flow rate andpressure ratio.

Design(applies only for compressed airat room temperature)

in the above critical range:

in the below critical range:

Legend: p1 = supply pressure, absolute [kPa] p2 = downstream pressure, absolute [kPa] p = pressure difference p1 - p2 [kPa] Qn = normal cubic meter [Nm3/h]

Payback

To produce 1 m3/h compressed air where

the mains pressure is 6 bars costs approxi-mately 0.01 to 0.03 (source: www.druckluft-effizient.de). Average consumption is approx-imately 10 Nm3/h. When the production plantis shut down, the leakage rate is approximately30%. With a two-shift system, compressed airconsumption per annum is

approximately 200 (working days)x 10 hours x 10 m3/h x 0.3 (leakage rate)x 0.02 = 120 .

(The leakage rate refers to the flexible con-nections downstream of the distributor and thecompressed air tools used.)

The payback time per motorized valve isless than 1.5 years.

p / p1 > 0.5 => kvs=7.6 Qn

p1

p / p1 < 0.5 => kvs=3.8 Qn

p p2

M

28

15 15

15 15

2

1

3 3 3 3

1 Motorised ball valve2 Distributor with 4 or 6 consumers3 Fast couplings to the compressd air consumers (tools)

Rising pipe

(stainless steel pipe)

Shut-off device Pressure line

Flexible

compressed air tube

All up to 10 cm okB

7/27/2019 A5_01en_BELIMO Ball Valve in a Compressed Air Application_Print

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A5-01 BELIMO ball valve in a compressed air application BC

For more detailed information, please contact your BELIMO representative:

Key words:Pneumatics, Gas applications, Shut-off devices

An air cushion machine at the end of a flexiblecompressed air tube.

Control ball valve upstream of the compressed airdistributor. Ceiling mounting.

Distributor with 6 connections. Supply line ofstainless steel. Depending on the application, thismay be with a various number of flexible com-pressed air tube.

A pneumatic engraving machine at the end of aflexible compressed air tube.

Experience

Twenty-two control valves were installed inthe new BELIMO LONGUS building a yearago and have been functioning perfectly sincethen.The rotary actuators are controlled bythe so-called MP bus. Eight of these

actuators are connected to a LON interface(UK24LON) using a 2-wire system.A higher-level LON controller controls all theBELIMO ball valves as they are needed.