Burkert 8681 - Flow Restriction Function of the Solenoid Valves

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Pneumatic Installation
→ Connecttherequiredworkingconnections2/A1to2/A3(accordingtothenumberofsolenoidvalvesin
thecontrolhead)withthecorrespondingconnectionsontheprocessvalve(“Fig.12”).
→ Connect the supply line to supplypressureconnection1/P(observethepermissiblepressurerange,
see chapter “6.6Pneumaticdata”onpage26).
NOTE!
Information to hose pipes!
•
Onlyuse approvedhosepipeswithØ6mm (or 1/4") or Ø8 mm (or 5/16")outerdiameters(tolerance:
+0.05/-0.1mm).
•Onlyusesuitablehosequalities(inparticularforhighambienttemperatures)thatbearupundercommon
stressescausedbythequickconnector.
•Only use a suitable hose cutter when cutting hose pipes. This will safeguard against damage and imper-
missible deformation.
•Accordingly dimension hose length to prevent that the hose ends in the plug-in hose connectors generate
anydiagonallypullingstresses(curvedoutletwithouteccentricstress).
Application of silencer or exhaust air hose?
•When using an exhaust air hose, accordingly dimension its length to ensure that a Q
Nn
value >620 l/min
is reached.
Note:
Dimension the hose lengths so that the control head can be removed from the process valve if
requiredwithoutanyadditionaldisassemblywork.
9.3 Flow restriction function of the solenoid valves
Settheowrestrictionscrewsofthesolenoidvalvesonlywhenneededandaftercompletionofall
necessary installations!
Theowrestrictionscrewsofthesolenoidvalves(see“Fig.13”)areusedforsettingtheairintakeand
exhaust for the working connections and thus also for setting the opening and closing speed of the process
valve:
•
Factorysettingofnominalowrate:Q
Nn
approx. 110 l/min.
•
Theowrestrictionscrewsdonotserveanysealingfunction.
•Onlytightentheowrestrictionscrewstothestopper,otherwisedamagetodevicemayoccur.
•Onlyuseappropriatescrewdrivers(b≤3mm).
When setting the retraction and extension rates of the pneumatic actuator, ensure that there is no
constant "primary pressure" during deaeration!
Keepinmindthattheworkingconditionsintheprocessvalveareaonthesideoftheproduct(ow
types,pressurevariations)mayresultinchangesinthesetaerationanddeaerationtimes.
english
Control Head Type 8681