tm12842 - e-tell.info · tm12842. PA90 Series - Lung Demand Valve tm 12842 - December 2000 ... Type...

PA90 Series - Lung Demand Valve

DDDDDTraining DrägerDrägerDrägerDrägerDräger

tm12842

tm 12842 - December 2000

Section 1 Instructions for Use

Section 2 Introduction and Safety Warnings

Section 3 Product Description

Section 4 Operating Principle

Section 5 Servicing Instructions

Section 6 Test Procedures

Section 7 Fault Location

Section 8 Spare Parts List and Tool List

Section 1 Instructions for Use

Positive Pressure Lung Demand Valve – Type A Series 3337392

Positive Pressure Lung Demand Valve – Type AE Series 3337393

Normal Demand Lung Demand Valve – Type N Series 3337394

Section 2 Introduction and Safety Warnings

IntroductionThe PA90 Series of Lung Demand Valves are approved for use with approvedDräger Compressed Air Breathing Equipment (C.A.B.E.) and Facepieces.

Refer to Illustration

The combination of Lung Demand Valve, C.A.B.E. and Facepiece provides thewearer of the equipment with respiratory protection when working in or escapingfrom a contaminated or oxygen deficient life-threatening environment.

Safety Warnings

! Explain - Instructions for Use, supplied with the equipment must be adheredto.

! Maintain - the respiratory protection equipment must be maintained asoutlined in the Dräger Limited service schedules and maintenanceinstructions.

Contact Dräger Limited, Blyth for details of Service Contracts and ServiceTraining Courses.

! Train potential wearers in how to wear and use equipment and tounderstand its limitations.

Contact Dräger Limited, Blyth for details of Wearer Training Courses.

Positive Pressure - Type A Illustrated

Section 3 Product Description

Product DescriptionThe variants of the PA90 Series Lung Demand Valve are as follows:

! Type A - Positive Pressure with Push-In connector to facepiece.

! Type AE - Positive Pressure with M45 Screw-In connector to facepiece.

! Type N - Normal Demand with M40 (Rd40) Screw-In connector to facepiece.

The high performance Lung Demand Valves incorporate a precision factory setand sealed balanced piston unit that has unlimited service life.

The Dräger Warranty and Guarantee is void should any attempt be made bycustomers to make adjustment to the balanced piston unit.

Detachable variants of the lung demand valves have a medium pressure hosewith a quick release male coupling to connect the demand valve to the femalecoupling of the medium pressure hose from the pressure reducer of theappropriate C.A.B.E.

Fixed variants of the lung demand valves incorporate a medium pressure hosehaving an end fitting design for connecting directly to the medium pressureoutlet port of the pressure reducer of the appropriate C.A.B.E.

The housing of the lung demand valves are manufactured from a mouldedcomposite glass filled material that provides a high degree of strength anddurability.

Positive pressure types have a manually operated re-set lever to switch ‘OFF’the positive pressure function - this must be pressed before opening the valve ofcompressed air cylinder. First breath inhalation by the wearer will switch ‘ON’the positive pressure.

All variants include a supplementary air supply facility that is made active bypressing the centre of the protective rubber cover at the front of the lung demandvalve. Lung demand valves fitted to short duration C.A.B.E. and escape unitswill not normally include a supplementary air supply facility.

Section 4 Operating Principle

Contents

Section Description

4.1 Positive Pressure Lung Demand Valves A and AE

4.2 Normal Demand Lung Demand Valves - N

4.1 Positive Pressure Lung Demand Valves - A and AE

Refer to Figure 1.

Before turning ‘On’ the high pressure air supply the positive pressuremechanism must be switched ‘Off’ by pressing the re-set lever on theside of the lung demand valve to lift and lock the main pivot lever anddiaphragm.

On opening the cylinder valve, medium pressure air flows from thereducer through a hose and swivel banjo then into main bore ofbalanced piston block.

Increasing air pressure moves the balanced piston axially, forcing thepiston cone against the O-Ring seal located in the block - sealing ‘Off’the airflow from outlet of lung demand valve.

Refer to Figure 2.

When the wearer begins to inhale this creates a negative pressure insidethe facepiece and lung demand valve. Due to the negative pressurethe ambient air pressure acts against the diaphragm. As the diaphragmdeflects it then presses against the main hinged lever of the balancedpiston unit resulting in the release of the positive pressure ‘Off’mechanism.

Increasing deflection of the diaphragm, during inhalation, pivots thebalanced piston lever forcing it against the end cap of the piston -moving the piston axially and lifting the piston cone from its seating andreleasing air from the lung demand valve into wearer’s facepiece. Twoextension springs attached to the balanced piston block and the mainlever act on the balanced piston, lifting the sealing cone and maintaininga positive pressure (above ambient) inside the facepiece.

When the wearer stops inhaling then begins to exhale, the diaphragm,pivot lever and sealing cone retract.

The cycle repeats as the wearer begins to inhale.

Fig. 10008

Fig. 20078

Balanced Piston‘Closed’

Balanced Piston‘Open’

Medium Pressure(M.P.)

M.P. Flowto Facepiece

4.2 Normal Demand Lung Demand Valves - N

Refer to Figure 3

On opening cylinder valve, medium pressure air flows from the reducer,through a hose and swivel banjo then into main bore of balanced pistonblock.

Increasing air pressure moves the balanced piston axially, forcing thepiston cone against the O-Ring seal located in the block - sealing ‘Off’the airflow from outlet of lung demand valve.

Refer to Figure 4

When the wearer begins to inhale this creates a negative pressure insidethe facepiece and lung demand valve. Due to the negative pressurethe ambient air pressure acts against the diaphragm then the mainhinged lever of the balanced piston unit.

Increasing deflection of the diaphragm, during inhalation, pivots thebalanced piston lever forcing it against the end cap of the piston -moving the piston axially and lifting the piston cone from its seating andreleasing air from the lung demand valve into wearer’s facepiece.

When the wearer stops inhaling then begins to exhale, the diaphragm,pivot lever and sealing cone retract.

The cycle repeats as the wearer begins to inhale.

Fig. 30249

Fig. 40250

Balanced Piston‘Closed’

Balanced Piston‘Open’

M.P. Flowto Facepiece

Medium Pressure(M.P.)

Section 5 Servicing Instructions

5:1 Contents

Section Description

5.1 Contents

5.2 Service and Test Intervals

5.3 Cleaning, Disinfecting and Drying

5.3.1 Important Information

5.3.2 Cleaning and Disinfecting

5.4 Replacing Diaphragm

5.5 Replacing Medium Pressure Hoses

5.5.1 Removing MP Hose (Elbow Connector)

5.5.2 Removing MP (Straight Connector)

5.5.3 Assembly of MP Hose (Elbow Connector) to Demand Valve

5.5.4 Assembly of MP Hose (Straight Connector) to Demand Valve

5.6 The Balanced Piston Unit

5.6.1 Removing Balanced Piston Unit

5.6.1.1 Replacing/Refitting Return Spring – Positive Pressure

5.6.2 Replacing Springs of Balanced Piston Units – Positive Pressure

5.6.3 Assembly of Balanced Piston Unit to Demand Valve

5.2 Service and Test IntervalsCarry out Inspection, Service and Testing of equipment according tothis table. Record all necessary data in the Log Book for the equipment.These instructions apply also to non-used in storage equipment.

Important Note: This table is intended as a general guide. Reference must alsobe made to the Inspection, Service and Test Intervals specified in theappropriate section of the relevant C.A.B.E. Training manual.

noitpircseD retfAesU

yrevEhtnoM

yrevEraeY

yrevE6

etelpmoCtnempiuqE

tcefnisiDdnanaelC "

noitcepsnIlausiV " #

sagnitseTkaeLdnalanoitcnuFesUrofsnoitcurtsnInidenifed

repsastseTcitatSdnawolFsnoitcurtsnIsrerutcafunaM

dnameDevlaV

yrassecensatcefnisiDdnanaelC $"

erusserPrecudeR

kcehCerusserPmuideM "

retliFderetniSecalpeR "

gniR-OrotcennoC.P.HecalpeR "

luahrevOcisaB)emehcSegnahcxEriapeR(

rednilyC erusserPtcerroCotegrahC "

kcehC.kcehCerusserPdegrahCrednilyCnodepmatSetaDtseT

erusserPrednilyC-noitacifitreC-eRtseT

)sdradnatSlanoitaNotgnidroccA(

rednilyCevlaV

emittaro,yrassecensaluahrevOnoitacifitreC-eRrednilyCfo

""""" Dräger Recommendation - UK.##### COSHH$$$$$ Type A - Push-In demand valve – apply grease (3331247) around connector

O-ring.

5.3 Cleaning, Disinfecting and Drying

5.3.1 Important InformationDräger recommend that contaminated and dirty components orassemblies are carefully cleaned and disinfected then thoroughly driedafter use, or as and when considered necessary by the user.

To ensure correct operational condition of the equipment use thecleaning and disinfecting solutions recommended by Dräger. The useof any other product will invalidate the Dräger warranty and guarantee.

When using baths to contain cleaning and disinfecting solutions theimmersed components and assemblies must only be agitated manually.

It is important to note that Dräger Do Not recommend the use of any formof mechanical, electrical or ultrasonic agitation of this product. If the userdecides however to use ultrasonic cleaning baths then it is important thatthe instructions supplied by the manufacturer of the bath are strictly followed.

Refer to Important Notes.

Important Notes:1.The diaphragm of the lung demand valves must not be cleaned usingultrasonic techniques, as this will have a detrimental affect on the centre-bonded area of the diaphragm. Clean and disinfect the diaphragmmanually.

2. If Ultrasonic cleaning is to be used on the lung demand valve(diaphragm must be removed) this will eventually remove lubricant fromthe critical moving parts. Duration in the bath combined with theultrasonic energy of the machine will affect the time for this to occur.Following cleaning, disinfecting and drying carry out functional tests.Re-lubricate moving parts as required.

3.Immersing the lung demand valve and manual agitation will alsoeventually remove lubricants although of course this will occur over amuch longer period. Following cleaning, disinfecting and drying it isrecommended that functional tests be carried out. Re-lubricate movingparts as required.

Safety Note: When using cleaning and disinfecting agents refer to the relevantmanufacturers’ usage instructions. It is important that attention be paidto concentration and reaction times. Do Not use organic solvents suchas Acetone, Alcohol, White Spirit, Trichloroethylene or similar.

Dräger recommends:

1. Cleaning:Safety Wash1 Litre Dispenser 33801641 Litre Refill 33801655 Litre Dispenser 33801665 Litre Refill 3380167Sekusept4 bottles @ 2 litres 7904071

Do Not exceed a temperature of 30 degrees Celsius.

Note: Rinse off cleaning solution in clean water before disinfecting.

2. Disinfecting:Wipex Cloths (Pack of 50) 3380375

Incidur – 6 litre container 7904072Incidur - 30 litre container 7904073

Do Not exceed a temperature of 30 degrees Celsius.

Note: Rinse off disinfecting solution in clean water before drying.

3. Rinsing and DryingRemove cleaning and disinfecting solutions by rinsing in clean runningwater, followed by drying.Rinsing - Do Not exceed a temperature of 30 degrees Celsius.Drying - Do Not exceed a temperature of 60 degrees Celsius.

5.3.2 Cleaning and Disinfecting

When the user considers it necessary to internally clean and disinfectthe lung demand valve then these instructions should be followed:

Note: A Detach demand valves (fitted with male coupling) from female couplingof medium pressure hose of the C.A.B.E.

Note: B If necessary, demand valves attached directly to the reducer shouldbe removed at the hose connection to the reducer. For details of removalrefer to the appropriate section of the relevant C.A.B.E. Training Manual.

Tools required:Plate Spanner R26817

1 If required, detach the demandvalve from the equipment.

2 Press the reset lever of positivepressure type demand valves.Do Not press centre of rubbercover while pressing the resetlever or force lever against thestop. See Fig. 1.

Refer to Figure 1.(PA90A Illustrated.)

0032/0251

&&&&&Fig. 1

123 45

Fig. 20028

3 Remove the rubber cover (1)then using plate spanner R26817unscrew and remove thebayonet cap (2). Press resetlever (3) - positive pressure typeonly. Carefully unhookdiaphragm (4) from the lever (5)of the balanced pistonassembly.

Important Notes: The diaphragmof the lung demand valves mustnot be cleaned using ultrasonictechniques, as this will have adetrimental affect on the centre-bonded area of the diaphragm.Clean and disinfect thediaphragm manually.

4 Re-assemble the rubber cover (1) over the front of the lung demandvalve to protect balanced piston mechanism. Immerse and manuallyagitate the demand valve, diaphragm and bayonet cap into cleaningfluid. (Refer to cleaning fluid instructions.)

5 After cleaning, rinse the components in clean water then immerse andmanually agitate the demand valve, diaphragm and bayonet cap intodisinfecting fluid. (Refer to disinfecting fluid instructions.) After disinfecting,remove rubber cover and rinse components in clean water, taking carenot to damage balanced piston lever mechanism.

6 Press reset lever of the positive pressure demand valves to closebalanced piston.

7 Connect the medium pressure hose of the demand valve to mediumpressure air supply. Turn ‘ON’ air supply then gently press the balancedpiston lever to blow out fluid residue.

Safety Note: Wear suitable eye protection.

8 Press reset lever of the positive pressure demand valves to close thebalanced piston. Turn ‘OFF’ and vent the air supply then disconnectmedium pressure hose of demand valve from air supply. Thoroughly ‘dry’components.

Note: Do Not exceed a temperature of 60 degrees Celsius when drying.

9 After drying insert the balanced piston lever into hole in centre boss ofthe diaphragm (chamfered side of boss towards lever) then carefullylocate outer bead of diaphragm into groove in demand valve body.See Fig. 3 for correct orientation of the diaphragm.

10 Moisten lip of the bayonet capwith clean water - refit bayonetcap to the lung and using platespanner R26817 tighten the capto the demand valve.

Note: Re-check orientation ofdiaphragm. See Fig. 3.

11 Re-assemble rubber cover overthe front of the demand valvethen press the reset lever ofpositive pressure type demandvalves.

12 Connect the demand valve toequipment and carry out LeakTest and Functional Test.

5.4 Replacing Diaphragm

Tools required:Plate Spanner R26817

Refer to Figure 4- (PA90A Illustrated)

1 Remove the rubber cover (1) thenusing plate spanner R26817unscrew and remove thebayonet cap (2). Press reset lever(3) - positive pressure types only.Carefully unhook diaphragm (4)from lever (5) of balanced pistonassembly. Scrap the diaphragm.

2 Insert the balanced piston leverinto hole in centre boss of the newdiaphragm (chamfered side ofboss towards lever) then carefullylocate outer bead of diaphragminto groove in demand valvebody. See Fig. 5 for correctorientation of diaphragm.

3 Moisten the lip of the bayonetcap with clean water - refit thebayonet cap to lung and usingthe plate spanner R26817 tightenthe cap to the demand valve.

123 45

Fig. 40028

Fig. 30029

Fig. 50029

4 Re-assemble the rubber coverover the front of the demandvalve then press the reset leverof positive pressure typedemand valves.

5 Connect the demand valve tothe equipment and carry outLeak Test and Functional Test.

5.5 Replacing Medium Pressure Hoses

Fixed variants of the lung demand valve incorporate a medium pressurehose fitted directly to the medium pressure outlet port of the pressurereducer. These demand valves should also be removed from the reducer.For details of removal of hose from the reducer refer to the appropriatesection of the relevant C.A.B.E. Training Manual.

5.5.1 Removing MP Hose (Elbow Connector)

Tools Required:10mm/11mm AF Open Ended Spanner 333630914mm AF Open Ended Spanner 3336308

1 Disconnect demand valve fromthe female quick releasecoupling of the equipment.

Refer to Figure 6.

1 Using 14mm spanner hold thebanjo (1) across flats on banjoflange and using the 11mmspanner unscrew the elbow (2)of the hose from the banjo.Inspect the hose and ifdefective, scrap and replace.

3 Inspect the threaded bore ofthe banjo. If necessary cleanand remove all traces ofadhesive from the thread. Fig. 6

5.5.2 Removing MP Hose (Straight Connector)

Tools Required:Fine Point Circlip Pliers 3333968Screwdriver 3336222Hexagon Adaptor – 2mm (Locking End Cap) 3310600Torque Key (Locking End Cap) 3310593

Refer to Figure 7.

1 Disconnect the demand valvefrom the equipment andremove the end cap (1).

Plastic End Cap - Insertscrewdriver (3336222) into radialslot of end cap and remove endcap. Scrap the end cap,replace with new.

Locking End Cap – Using 2mmadaptor and torque keyunscrew the locking cap screwenough to enable the end capto be removed.

2 Using fine point circlip pliers,remove circlip (2) from groove inthe banjo. Remove washer (3).Scrap the circlip - Do Not re-use.

Note: On positive pressure demandvalves Do Not detach reset lever(4). If the lever becomesdetached, reassemble the leverto the demand valve asdetailed in Section 5.6.1.1.

3 Push end of the banjo andextract banjo and hoseassembly (1) Fig. 8 fromdemand valve body. Check O-Ring (2) is on the banjo, if not,remove the O-Ring from bore ofthe demand valve housing.

Fig. 71239

Fig. 81238

5.5.3 Assembly of MP Hose (Elbow Connector) to Demand Valve

Tools Required:10mm/11mm AF Open Ended Spanner 333630914mm AF Open Ended Spanner 3336308Loctite 638 3335389

1 Inspect the threaded bore of the banjo and if necessary clean andremove all traces of adhesive from the thread. Check that the O ringseal of the new hose is not damaged and is fitted correctly to the elbow.If necessary replace the O ring.

2 Screw the elbow of the new hose into the banjo by one revolution -apply one drop of Loctite 638 to thread of the elbow then finally screwthe elbow into the banjo. Using 14mm spanner, hold the banjo acrossflats of the banjo flange and using the 11mm spanner tighten elbow tothe banjo.

Note: Do Not pressurise pneumatic system for 30 to 40 minutes to allow Loctiteto set. Fixed variants of the lung demand valve should be fitted directlyto the medium pressure outlet port of the pressure reducer. For detailsof fitting of hose to the reducer refer to the appropriate section of therelevant C.A.B.E. Training Manual.

3 Carry out Leak Test and Functional Test after 30 to 40 minutes.

5.5.4 Assembly of MP Hose (Straight Connector) to Demand Valve

Tools Required:Molykote 111 grease 3331247Circlip Assembly Tool 3335972Hexagon Adaptor – 2mm (Locking End Cap) 3310600Torque Key (Locking End Cap) 3310121

Fig. 91238

1 Inspect and if necessaryassemble new O-Rings into thegrooves of the banjo (1) Fig 9.Before assembly of the banjo tothe demand valve apply acoating of Molykote 111 greasearound the outside diameter ofO-Rings.

2 Carefully insert new banjo andhose assembly into bore ofdemand valve body, aligningthe banjo through bore ofbalanced piston block andtaking care not to detach thereset lever (2) of positive pressuredemand valves.

Note: If reset lever becomesdetached, reassemble lever todemand valve as detailed inSection 5.6.1.1.

4 Assemble washer (1) Fig. 10.Using the assembly tool 3335972assemble the circlip (2) intogroove of banjo to secure banjoto demand valve body.Following assembly of the circlipcheck that the banjo swivelsfreely.

5 Fit new End Cap into bore of thebanjo.

Plastic End Cap - Insert newplastic end cap into bore ofbanjo.

Locking End Cap – Insert lockingend cap into bore of the banjoand using 2mm adaptor andtorque key tighten end cap tobanjo – torque to 0.7Nm.

Note: Fixed variants of the lungdemand valve should be fitteddirectly to the medium pressureoutlet port of the pressurereducer. For details of fitting ofhose to the reducer refer to theappropriate section of therelevant C.A.B.E. TrainingManual.

6 Carry out Leak Test andFunctional Test.

Fig. 101120

5.6 The Balanced Piston Unit

PA90 Series lung demand valves incorporate a pre-set and sealedbalanced piston unit. The Dräger guarantee is void should original seal,in sealing cone, be tampered with, or broken. Guarantee of correctoperational condition of the balanced piston unit is only valid if serviced,and re-sealed, by Dräger.

Replace with new factory set, or Repair Exchange balanced piston unitshould problems occur (other than a requirement to replace springs onpositive pressure type units).

Balanced Piston Units will only be accepted for Repair Exchange afterdisassembly from demand valve, i.e. Balanced Piston Assembly only.

For details of the Terms and Conditions of the Repair Exchange Schemecontact Dräger Service - Blyth.

Replace complete balanced piston unit, or springs, as follows:

5.6.1 Removing Balanced Piston Unit from Demand Valve

Tools required:Plate Spanner R26817Fine Point Circlip Pliers 3333968Posi-Drive Screwdriver 3331245Screwdriver 3336222Hexagon Adaptor – 2mm (Locking End Cap) 3310600Torque Key (Locking End Cap) 3310593Molykote 111 Grease 3331247Loctite 245 3335722Connector Tool (PA90AE) 3310497Connector Tool (PA90N) 3310496Circlip Assembly Tool 3335972

123 45Fig. 11

1 Remove the rubber cover (1)then using plate spanner R26817unscrew and remove thebayonet cap (2). Press resetlever (3) - positive pressure typesonly. Carefully unhookdiaphragm (4) from lever (5) ofbalanced piston assembly.

Refer to Figure 12.

2 Using posi-drive screwdriverunscrew retaining screw (1) untilit is withdrawn from space in thecastellation of connector (2).

Note: Do Not attempt to remove push-in or screw-in connectors withthe retaining screw in thecastellation of the connector.

3 Remove connector.

Push-in Type - AUnscrew push-in type connector(anti-clockwise) from demandvalve body and remove anti-injector pipe (3).

Screw-in Type - AEUse connector tool (3310497) to unscrew screw type connector andhandwheel assembly from demand valve body. Remove anti-injector pipe.

Screw-in Type - NScrew and tighten M40 handwheel to connector tool 3310496. Turnhandwheel and connector tool anti-clockwise to unscrew screw typeconnector and handwheel assembly from demand valve body. Removeanti-injector pipe.

4 Remove end cap (1) Fig. 13.

Plastic End Cap - Insertscrewdriver (3336222) into radialslot of end cap and remove endcap. Scrap the end cap,replace with new.

Locking End Cap – Using 2mmadaptor and torque keyunscrew the locking cap screwenough to enable the end capto be removed.

5 Using fine point circlip pliers,remove circlip (2), from groove inbanjo. Remove washer (3).Discard the circlip - Do Not re-use.

Fig. 120041/0127

Fig. 130042

Note: On positive pressure demand valves Do Not detach reset lever (4). Iflever becomes detached then reassemble lever to the demand valveas detailed in Section 5.6.1.1.

Fig.14

6 Push end of the banjo andextract banjo and hoseassembly (1) from demandvalve body. See Fig. 14. CheckO-Ring (2) is on the banjo, if not,remove the O-Ring from bore ofthe demand valve housing.

7 Remove balanced piston unitfrom inside demand valve bodyand if necessary returnbalanced piston unit to DrägerService for replacement underthe Repair Exchange Scheme.

8 Clean old grease from thebanjo, inspect and if necessaryreplace the O-Rings.

5.6.1.1Replacing/Refitting Return Spring Positive Pressure DemandValves

Note: Using a finger inside the demand valve body press the end of the positivepressure arm (1) Fig. 15 to prevent any axial movement.

Fig. 150044

1 Rotate the positive pressure arm(1) until the radial extension armpoints towards outlet port of thedemand valve body.

2 Insert return spring (2) into thehousing recess with the radial armof the spring located into theradial slot in demand valve body.

3 Hook the axial arm of the returnspring (2) into the radial slot inthe lever (3) - not onto hexagon- then carefully rotate the leveranticlockwise, against springtension, until the first hexagonflat aligns with hexagon on thepositive pressure arm. Press thelever onto the positive pressurearm.

4 Rotate the lever anticlockwise, carefully lifting the stop of the lever to theopposite side of the rib on the body of demand valve. At this position pressthe lever onto the positive pressure arm.

5 Check assembly and carefully press lever (3) against spring tension -lever should return freely under spring load.

5.6.2 Replacing Springs of Balanced Piston Unit - Positive Pressure

Tools required:Fine Point Tweezers 3333326

1 Remove Balanced Piston Unitfrom Demand Valve. Repeatinstructions 1 to 9 in Section 5.6.1.

Refer to Figure 16.

2 Unhook closed loop of eachspring (1) from locating lugs ofbalanced piston lever (2), thenunhook open loop of eachspring from pin of mountingblock (3). Scrap the springs. DoNot re-use springs.

3 Using fine point tweezersassemble new springs tobalanced piston block assemblyas follows:

Hook open loop, of each springaround the spigots of themounting block (3). Using finepoint tweezers hold the closedloop of each spring then extendeach spring and hook closedloop onto locating lugs ofbalanced piston lever (2). DoNot over stretch the springs.

Note: Position the spring on the plasticform side (4), under the pivot pin(5) as shown in Fig. 16.

4 To re-assemble the BalancedPiston Unit to Demand Valve,repeat operation instructions 1to 16 in Section 5.6.3.

Fig. 160047

5.6.3 Assembly of Balanced Piston Unit to Demand Valve

Fig. 170045

Fig. 180043

Fig. 190046

1 Inspect and if necessaryassemble new O-Rings into thegrooves of the banjo. Beforeassembly of the banjo to thedemand valve apply a coatingof Molykote 111 grease aroundthe outside diameter of the O-Rings.

Safety Note: Carefully read instructions onMolykote 111 container regardingthe handling of silicone grease.

2 Insert new balanced piston unitinto demand valve body andlocate onto internal location bossof demand valve body. See Fig.17. Hold balanced piston inposition by pressing with thumbagainst the end of seal cone.

3 Carefully insert banjo and hoseassembly (1) Fig. 18 into bore ofdemand valve body, aligningthe banjo through bore ofbalanced piston block andtaking care not to detach thereset lever (2) of positive pressuredemand valves.

Note: If reset lever (2) becomesdetached, reassemble to thedemand valve as detailed inSection 5.6.1.1.

4 Assemble washer (1) Fig. 19. Usingthe assembly tool 3335972assemble the circlip (2) intogroove of banjo to secure banjoto demand valve body. Followingassembly of the circlip check thatthe banjo swivels freely.

5 Position and hold demand valvewith outlet port in verticalposition. Insert the anti-injectorpipe (1) into the port and locateonto the balanced piston block.See Fig. 20.

Fig. 200041/0127

6 Assemble connector.

Push-in Type - AAssemble new O-Ring (2) Fig. 20to connector. Apply Loctite 245to connector thread and screwconnector (3) into demandvalve body. Tighten until anti-injector pipe is secure. Do Notovertighten.

Screw-in Type - AECheck handwheel freely rotateson connector handwheelassembly and that retainingcirclip is secure. Assemble new O-Ring to connector handwheelassembly. Apply Loctite 245 toconnector thread. Using tool(3310497), screw connectorhandwheel assembly intodemand valve body until anti-injector pipe is secure. Do Notovertighten.

Screw-in Type - NCheck handwheel freely rotates on connector handwheel assembly andthat retaining circlip is secure. Assemble new O-Ring to connectorhandwheel assembly. Apply Loctite 245 to connector thread. Screw andtighten handwheel into tool 3310496 and screw connector handwheelassembly into demand valve body until anti-injector pipe is secure. Do Notovertighten.

8 Carefully turn connector anti-clockwise till first space, in castellations onend face of connector, is in line with retaining screw hole. Fully tightenthe retaining screw to secure the connector to the demand valve bodymaking sure the screw enters space in the castellation.

Note: Remove assembly tools from handwheel connectors of AE and N typedemand valves.

9 Check again that the banjo swivels freely.

10 Positive Pressure Demand ValvesPress the reset lever, checking that spring loaded lever of the balancedpiston lifts and, on releasing the reset the lever the spring loaded leverholds in position. Gently press the end of balanced piston lever checkingit releases from locking plate and retracts freely under spring load. Repeatcheck. Press reset lever to lift and hold the balanced piston lever.

Fig. 21

11 Insert the balanced piston leverinto hole in centre boss of thenew diaphragm (chamferedside of boss towards lever) thencarefully locate outer bead ofdiaphragm into groove indemand valve body. See Fig.21for correct orientation ofdiaphragm.

12 Moisten the lip of the bayonetcap with clean water - refit thebayonet cap to lung demandvalve and using plate spannerR26817 tighten the cap.

13 Positive Pressure Demand ValvesPress the reset lever, checking that diaphragm lifts and then on releasingthe reset lever that the diaphragm holds in position. Do Not press thecentre of the diaphragm when pressing reset lever, or force lever againststop. Press the centre of diaphragm gently, checking it releases andretracts under spring load. Repeat check.

15 Fit new End Cap to banjo.

Plastic End Cap - Insert new plastic end cap into bore of banjo.

Locking End Cap – Insert locking end into bore of banjo and using 2mmadaptor and torque key tighten end cap to banjo – torque to 0.7Nm.

16 Assemble rubber cover to the demand valve then carry out Leak Testand Functional Test.

Section 6 Test Procedures

Contents

Section Description

6.1 Test Procedures

The PA90 Series of Lung Demand Valve are approved for use withapproved Dräger Compressed Air Breathing Equipment (C.A.B.E.).

Standard test procedures for C.A.B.E. are as follows and are covered inthe relevant Training Manual for the C.A.B.E.

! Cylinder Pressure Check and Valve Leak Test! High Pressure Leak Test! Whistle Warning Unit Test! Full Flow Test! Medium Pressure Test - Pressure Reducer

For detailed instructions of the following Functional Tests relating to thetesting of the lung demand valve and associated ancillary items referto the appropriate Test Equipment Manual.

Type A and AE! Balanced Piston Leak Test! Positive Pressure Balance Test! Static Pressure Test! Positive Pressure Switch Over

Type N! Balanced Piston Leak Test! Demand Valve Opening Pressure

Section 7 Fault Location

Contents

Section Description

7 Fault Location

7.1 Demand Valve

7 Fault Location

7.1 Demand ValveThe high performance PA90 Series lung demand valves incorporate apre-set and sealed balanced piston unit that has unlimited service life.

The Dräger Warranty and Guarantee is void should any attempt bemade by customers to make adjustment to the balanced piston unit.Guarantee of correct operational condition of the balanced piston unitis only valid if serviced, and re-sealed, by Dräger.

Replace with new factory set or Repair Exchange balanced piston unitif problems occur (other than a requirement to replace springs on positivepressure type units). Balanced Piston Units will only be accepted for RepairExchange after disassembly from demand valve, i.e. Balanced PistonAssembly only.

For details of Terms and Conditions of Repair Exchange Scheme contactDräger Service - Blyth.

The following Fault – Cause – Remedy chart outlines a list of possiblefaults that may occur.

TLUAF ESUAC YDEMER

erusserpmorfkaeLmuidemfoevlavfeiler

esoherusserp

gnir-OdegamaDgnirpSkaeW

gnir-OdegamaDreniater

gnir-OecalpeRgnirpsecalpeR

reniaterecalpeR

feilererusserpmorfkaeLmuidemfoevlav

feileR.esoherusserp.K.Ostnenopmocevlav

eruliafrecudeR morfsesohevomeRnruterdnarecuder

)XER(.regärDotrecuder

muideMhgiHerusserP

fotuorecudeRnoitacificeps

morfsesohevomeRnruterdnarecuder

)XER.regârDotrecuder

muideMwoLerusserP

fotuorecudeRnoitacificeps

)XER(.regârDotrecuder

erusserpmuideMenoretfahgiH

etunimpeercsuounitnoC

erusserPhgiHkaeL

)XER(.regârDotrecuder

Section 8 Spare Parts Lists and Tool List

Contents

stm1284.2 PA90 Series Lung Demand Valve

1285.16 Tool List

tm12842 - e-tell.info · tm12842. PA90 Series - Lung Demand Valve tm 12842 - December 2000 ... Type...

Documents

Transcript of tm12842 - e-tell.info · tm12842. PA90 Series - Lung Demand Valve tm 12842 - December 2000 ... Type...

Assessing the Cost of Large‐Scale Power Outages to Residential Customers · 2019-09-19 · Risk Analysis, Vol. 38, No. 2, 2018 DOI: 10.1111/risa.12842 Assessing the Cost of Large-Scale

Fire safety of concrete structures - e-tell.info fire tests... · performance-based methods for the structural fire engineering design of concrete ... for the fire resistance of precast

Assessing scientiﬁc research performance and … › 12842 › 1 › MPRA_paper_12842.pdfof research performance. A recent report by the joint Committee on Quantitative Assessment

2009 Product Summary - DIYTrade.com · A mix of IC, board-level module and hybrid product ... PA50 PA50A PA52 PA52A PA03 PA89 PA94 PA95 PA84 PA90 PA88 ... PRODUCT SUMMARy 2009 ...

Denso PA90 Catalog - Metroautoinc PA90 Catalog.pdf · Denso PA90S Isuzu, Chevrolet, GMC Truck 2008 up w/MT Isuzu 4HK1-TC 5.2L GM: 98092464 Isuzu: 8980924640, 8980924641, 428980924642

The Economy of Nature: The Structure of Evolution in ...philsci-archive.pitt.edu/12842/1/EoN-Preprint.pdf · The Economy of Nature: The Structure of Evolution in Linnaeus, Darwin,

PA90 User Manual (20091014) ver 13 · Please take a few moments to read the entire manual, and be sure to retain this document for future reference. Please read ... MIC 1, MIC 2,

AVK - AlJammaz Hydrotek · Type tested to conform to BS EN 5163, BS EN 1074-1 and 2, BS EN 12266, BS EN 12842 and BS EN 1171. Full traceability with unique serial numbers. Conforms

Training - e-tell.info · Testor te 16142 - May 2000 1:1 1.1 Introduction The Dräger Testor test equipment provides an efficient means of testing the Functional features of the Dräger

LUKAS - e-tell.info · PDF fileThe LUKAS Multi-Function-Concept The LUKAS Speed-Concept ... Each and every LUKAS Tool undergoes a quality ... 9 1/4" (235 mm) 3" (80 mm) WEIGHT 30 lbs

SUZUKI GENUINE PARTS/2 …€¦ · 10 12840-20g00 2 arm,valve rocker 12840-20g00-000 52000.00 11 12842-09g00 2 screw adjusting 12842-09g00-000 6400.00 12 12843-09g00 2 nut,adjusting

Denso PA90 Catalogmetroautoinc.com/Download/Denso PA90 Catalog.pdf · Metro Auto Industrial Inc. Toll Free:1-800-263-8761 BG-S010 June, 2019 Denso PA90 Starters Parts & Unit Solenoid

AT-12842 B-40085 100,000-Barrel Articulated Tug Barge

JOHNICAjohnica.com/catalog/STR/180123S_PLGR_PA90_STARTER...190-6354 9 5202-8275 CE FRAME 10 5202-8276 CE FRAME PLGR PA90 STARTER COMPONENTS JOHNICA DM#180123S Page:2/7 NO. P/N PHOTO

Scanned by CamScannerchandigarh.gov.in/pdf/fin20-12842-3009.pdf · 2020. 10. 6. · case of any dispute, same shall be resolved quickly through the speedy dispute redressal mechanism

Published in European Journal of Psychology of Education ...doc.rero.ch/record/12842/files/Hviid_Pernille_-_Editorial_introduction... · cc gtsat iznponaoce schools, settiwa cc to

High Voltage Power Operational Amplifiers · PDF file · 2015-10-20High Voltage Power Operational Amplifiers RoHS COMPLIANT PA90 ... The PA90 is a high voltage, ... However, for protection

Training tm 1412p Panorama Nova Training Manual - e-tell.info · PDF filePanorama Nova P tm 1412p - December 2000 Index Section 1 Instructions for Use Section 2 Introduction and Safety

Product Summary Guide - top-electronics.comtop-electronics.com/userfiles/Product-Summary-Guide.pdf · PA50 PA52 PA03 PA89 PA94 PA95 PA84 PA90 PA88 PA83 ... Product Summary Guide 3

Master Thesis Assessing Input in Pig Production with ...pigtrop.cirad.fr/.../12842/file/8_HuongTra_2004.pdf · Institute of Animal Husbandry in the Tropics and Subtropics (480 a)