pressure dump valve service kit for series 2300...

Instruction Sheet

E 1996 Nordson CorporationAll rights reserved

41--2300--IS--13 (formerly 46--244)Issued 2/96

P/N 108 836C

P/N 108 836C

Pressure Dump Valve Service Kitfor Series 2300 Units

The Nordson pressure dump valve is used to relieve hydraulic pressureinstantly in Series 2300 applicator tanks when the unit circuit breaker isturned off. Otherwise, you must trigger one or more guns and open theapplicator manifold drain valve to completely relieve hydraulic pressure.

The pressure dump valve replaces the standard pressure relief valve,though the pressure dump valve includes the standard pressure reliefvalve in its assembly.

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Fig. 1 Main Components of the Pressure Relief Dump Valve Assembly

1. Standard pressure relief valve mechanism2. Pressure dump valve mechanism3. Valve screw body

There are two pressure dump valve service kits for Series 2300applicators:

S Series 2300 units without the low level indicator, kit P/N 179 609S Series 2300 units with the low level indicator, kit P/N 179 608

This instruction sheet covers both kits.

1. Overview

2 Pressure Dump Valve Service Kit



P/N 108 836C

The pressure dump valve uses compressed air from the applicator tomaintain hydraulic pressure. During normal operation, molten adhesivefrom the tank flows up the central channel of the valve screw body andinto the attached valve body. Compressed air from the applicator forcesa piston-stem-ball assembly inside the valve body down against a nozzleseat. This keeps the valve closed, prevents hot melt adhesive fromleaving the valve, and maintains system pressure.

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Fig. 2 Pressure Dump Valve During Normal Operation

1. Piston (in DOWN position)2. Spring3. Ball valve (in CLOSED position)

4. Hot melt adhesive5. Pressure dump valve body6. Nozzle seat

Note: Arrow indicates air flow and downward movement of piston-stem-ballassembly.

1. Overview (contd.)

3Pressure Dump Valve Service Kit



P/N 108 836C

When the applicator circuit breaker is turned off and air pressure isexhausted, the spring-loaded piston-stem-ball assembly is forced up andaway from the nozzle seat. This allows molten adhesive in the valvescrew body to flow immediately through a central channel in the valvebody, out from the bottom of the valve, and into the tank.

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Fig. 3 Pressure Dump Valve with Unit Shut Down

1. Piston (in UP position)2. Spring3. Ball valve (in OPEN position)

4. Hot melt adhesive5. Pressure dump valve body6. Nozzle seat

Note: Arrow indicates air flow and upward movement of piston-stem-ballassembly.

1. Overview (contd.)




P/N 108 836C

WARNING: Allow only qualified personnel to perform thefollowing tasks. Observe and follow the safety instructions inthe Safety Instructions section of the applicator manual.

The pressure dump valve can be installed on Series 2300 applicatorswith or without Nordson low level indicator kits.

Refer to the Nordson product manual as needed when locatingcomponents named in the following procedure.

S Flat head screwdriverS Open end wrenchesS Socket wrenchS Torque wrench

1. Drain the applicator tank of as much hot melt adhesive as possible.

2. Switch the applicator circuit breaker OFF, then disconnect and lockout electrical power from the applicator.

WARNING: Risk of electrical shock. The applicator containsenergized components with potentials that could cause death.Disconnect and lock out input power before continuing with thisprocedure.

3. Allow any remaining hot melt adhesive in the tank to cool but notsolidify.

2. Installing the PressureDump Valve

Required Tools and Materials

Replacing the Solenoid

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P/N 108 836C

4. Use a socket wrench to remove the existing pressure relief valve fromthe tank. Do not remove the screen from the bottom of the tank.

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Fig. 4 Existing Pressure Relief Valve Location

1. Tank2. Pressure relief valve

5. Loosen the pump cover captive screw, then remove the pump cover.To prevent damage to the pump, do not rock the cover back and forth.

6. Set the pump air pressure regulator to 0 psi/kPa, then turn off the airsupply to the regulator.

Fig. 5 Setting the Pump AirPressure to 0

Replacing the Solenoid (contd.)




P/N 108 836C

7. Disconnect the solenoid air line from the base of the pump mount.Discard the male connector.

8. Disconnect and discard the solenoid air line and elbow connectorfrom the front of the solenoid valve.

9. Unplug the solenoid electrical connector from its wiring harness, thenremove and discard the solenoid valve.

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Fig. 6 Existing Air Line and Solenoid Valve Details

1. Solenoid air line2. Male connector3. Elbow connector4. Solenoid valve

5. Pipe nipple6. Air control valve7. Solenoid electrical connector





P/N 108 836C

10. Replace the existing single pipe nipple in the front of the air controlvalve with the two steel nipples, tee fitting, and male connector fromthis service kit. The base of the tee should point straight down.

11. Install the new solenoid valve from this service kit on the outer steelnipple. Do not plug the solenoid electrical connector into its wiringharness yet.

12. Install a new elbow connector from this service kit in the newsolenoid.

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Fig. 7 New Air Line and Solenoid Valve Details

1. Steel nipple2. Tee fitting3. Male connector4. Solenoid valve

5. Elbow connector6. Solenoid air line7. Solenoid electrical connector





P/N 108 836C

13. Remove the hex nut and ferrule from the new connector.

14. Insert the end of the new solenoid input air line from this service kitthrough the hex nut, then slide the ferrule onto the end of the air line.

15. Align the end of the new solenoid input air line with the elbowconnector.

16. Use an open end wrench to tighten the hex nut onto the elbowconnector.

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Fig. 8 Typical Connector and Air Line Details

1. Connector2. Ferrule

3. Air line4. Hex nut

17. Install a new male connector from this service kit in the base of thepump mount. See Figure 7.

18. Use the method described in steps 13-16 to attach the other end ofthe new solenoid input air line to the male connector in the base ofthe pump mount.





P/N 108 836C

NOTE: If your applicator does not have the low level indicator installed,skip this procedure.

1. Disconnect the factory input air line from the base of the pump mount.

2. Remove the screws and washers that secure the pump mount to theapplicator.

3. Rotate the pump slightly in a circular motion to break the suction, thenpull the pump straight up to disengage the crossover tube from themanifold.

4. Disconnect the applicator wiring harness from the two connectors atthe top of the low level indicator bracket.

5. Remove the screws and washers that secure the low level indicatorbase plate to the tank cover, then carefully lift the low level indicatorassembly away from the unit.

6. Replace the low level indicator base plate with the new one from thisservice kit.

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Fig. 9 Low Level Indicator Details

1. Wiring harness and connectors2. Low level indicator assembly

3. Base plate

Modifying the Low LevelIndicator andReplacing the Tank Cover




P/N 108 836C

7. Loosen the captive screw on top of the electrical cabinet cover, thenlift the cover away.

8. Remove the seven screws that secure the tank enclosure, then liftaway the tank enclosure, tank cover, and tank gasket.

9. Replace the tank gasket with a new one from this service kit, theninstall the replacement tank cover from this service kit.

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Fig. 10 Tank, Tank Cover, and Gasket Details

1. Tank cover2. Tank gasket

3. Tank

10. Reinstall the tank enclosure and secure it in place with the sevenscrews removed in step 8.

11. Reinstall the electrical cabinet cover.

12. Reinstall the pump and reconnect the factory input air line to the baseof the pump mount.

13. Reinstall the low level indicator assembly.

14. Reconnect the applicator wiring harness to the two connectors at thetop of the low level indicator bracket. See Figure 9.

Modifying the Low LevelIndicator and Replacing theTank Cover (contd.)




P/N 108 836C

1. Plug the solenoid electrical connector into its wiring harness socket.

2. Ensure that all connections are tight.

3. Power up the unit and allow it to reach application temperature.

4. Apply Never-Seez lubricant to the pressure dump valve threads, theninstall the pressure dump valve in the existing hole in the tank bottom.

5. Use a socket wrench on the valve screw body hex flats to torque thepressure dump valve to 11-14 NSm (8-10 ft-lb).

6. Position the pressure dump valve so that it is oriented atapproximately a 45-degree angle to the front of the tank.

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Fig. 11 Correct Orientation of the Pressure Dump Valve

1. Pump2. Pressure dump valve

3. Tank opening

Installing the Pressure DumpValve




P/N 108 836C

7. If your unit does not have a low level indicator, carefully pry the plugfrom the existing hole in the tank cover in front of the pump. Threadthe dump valve input air line from this service kit through this hole inthe tank cover, then go to step 7. Otherwise go to step 6.

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Fig. 12 Dump Valve Air Line Details for Units without Low level Indicator

1. Dump valve input air line2. Tee fitting3. Elbow connector4. Dump valve

5. Dump valve vent line6. Male connector7. Hex flats

Installing the Pressure DumpValve (contd.)




P/N 108 836C

8. If your unit has a low level indicator, thread the new metal dump valveinput air line from this service kit through the hole in the tank cover atthe notch in the low level indicator base plate.

9. Locate the connector at the top of the pressure dump valve.

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Fig. 13 Dump Valve Air Line Details for Units with Low level Indicator

1. Dump valve input air line2. Tee fitting3. Elbow connector4. Dump valve






P/N 108 836C

10. Remove the hex nut and ferrule from the connector.

11. Insert the end of the air line through the hex nut, then slide the ferruleonto the end of the air line.

12. Align the end of the air line with the elbow connector on the pressuredump valve.

13. Use an open end wrench to tighten the hex nut onto the elbowconnector. Do not overtighten the hex nut.

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Fig. 14 Typical Connector and Air Line Details

1. Connector2. Ferrule

3. Air line4. Hex nut

14. Repeat steps 8-11 to attach the other end of the dump valve input airline to the tee fitting between the pump air valve and solenoid.

NOTE: You may have to adjust the elbow connector on the pressuredump valve slightly to allow for proper routing of the air line.

15. Thread the new 1/8 inch metal dump valve vent line through the samehole in the tank cover as the input air line to the pressure dump valve.

16. Repeat steps 8-11 to attach this dump valve vent line to the maleconnector on the side of the valve body inside the tank. Do notovertighten the connector hex nut.





P/N 108 836C

17. Ensure that the dump valve vent line opening is unblocked.

18. Reinstall the pump cover.

19. Fill the tank with adhesive and proceed with normal operation. Thepressure dump valve was designed to operate while submerged.

The pressure dump valve works automatically. When you switch theapplicator circuit breaker ON and set the applicator air pressure at thefilter/regulator, air is directed through the solenoid, to the pump air valve,and to the pressure dump valve piston. As long as the applicator circuitbreaker is switched ON, system air pressure is maintained and the pistonremains in the DOWN position, keeping the valve closed.

When you switch the applicator circuit breaker OFF, system air pressureis relieved and the pressure dump valve piston is forced up by the spring.This upward movement by the piston allows the pressure dump valve toopen and relieve hydraulic pressure inside the manifold.

A backup pressure relief valve in the pressure dump valve mounting stemautomatically vents material through a hole in the side of the valve if thehydraulic pressure exceeds 1,600 psi (11,032 kPa).

No periodic maintenance is required.

The pressure dump valve requires service only if:

S the valve fails to relieve hydraulic pressure when the applicator circuitbreaker is switched OFF

S the valve fails to close and hold hydraulic pressure during normaloperation

In either case, contact your Nordson representative for the items requiredto properly repair the pressure dump valve.


3. Operation

4. Maintenance




P/N 108 836C

To check for hydraulic pressure, trigger a gun and check for hot meltmaterial output. If the unit had been operating correctly prior to theinstallation of the pressure dump valve, but has little or no hydraulicpressure now, the probable cause is either the pressure dump valve itselfor one of its components.

Problem Possible Cause Corrective Action Refer to

No or littleadhesive outputdue to insufficienthydraulic

Not enough air pressure to keeppressure dump valve piston inDOWN position

Ensure that the input air pressure isset correctly

Series 2300manual

hydraulicpressure Pressure dump valve incorrectly

installed in tank bottomReview the pressure dump valveinstallation steps

Installing thePressureDump Valveprocedurein thispublication

Loose air line connections Review air line installation steps Replacing theSolenoid andInstalling thePressureDump Valveproceduresin thispublication

Faulty pressure dump valve Replace the pressure dump valve Removing thePressureDump Valveand Installingthe PressureDump Valveproceduresin thispublication

5. Troubleshooting




P/N 108 836C

Complete this procedure if the pressure dump valve must be removed forany reason.

1. Drain the applicator tank of as much hot melt adhesive as possible.

2. Switch the applicator circuit breaker OFF, then disconnect and lockout electrical power from the applicator.

WARNING: Risk of electrical shock. The applicator containsenergized components with potentials that could cause death.Disconnect and lock out input power before continuing with thisprocedure.

3. Allow any remaining hot melt adhesive in the tank to cool but notsolidify.

4. Remove the pump cover. To prevent damage to the pump, do notrock the cover back and forth.

5. Set the pump air pressure regulator to 0 psi/kPa, then turn off the airsupply to the regulator.

6. Disconnect and remove the dump valve vent line from the maleconnector on the side of the pressure dump valve body.

7. Disconnect the input air line from the male elbow connector at the topof the valve body.

6. Removing the PressureDump Valve




P/N 108 836C

8. Disconnect the other end of this air line from the tee fitting betweenthe solenoid and the pump air valve.

9. Use a socket wrench on the valve screw body hex flats to remove thepressure dump valve from the tank bottom.

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Fig. 15 Dump Valve Air Line Details (Typical)

1. Dump valve input air line2. Tee fitting3. Male elbow connector4. Dump valve


6. Removing the PressureDump Valve (contd.)




P/N 108 836C

The number in the Item column is the number assigned to the part in theaccompanying illustration.

The six-digit number in the Part column is the Nordson Corporation partnumber assigned to that part.

The Description column gives the Nordson Corporation name of the part,along with its dimensions and other physical properties, whereappropriate.

The number in this column is the quantity required per unit or assembly.A dash appears in this column for o-ring lubricant because it is applieddirectly to o-rings.

A letter in the Note column refers to a note at the end of the parts listwhich gives additional information about the part.

7. Illustrated Parts Lists

Item Number Column

Part Number Column

Description Column

Quantity Column

Note Column




P/N 108 836C

Service kit P/N 179 609 applies to all Series 2300 units without the LowLevel Indicator. Service kit P/N 179 608 applies to all Series 2300 unitswith the Low Level Indicator.

Item Part Description Quantity Note

1 179 667 Valve, Solenoid, 3-Way, Dump Valve 1

2 973 000 Nipple, Steel 2

3 973 250 Fitting, Tee, Pipe, Hydraulic, 1/8 1

4 972 003 Connector, Elbow, Male, SAE, Stainless Steel, 1/4 x7/16-20

1

5 142 593 Air Line, Solenoid 1 A

6 971 151 Connector, Male, 1/4 Tube x 1/8 NPT 2

7 134 903 Air Line, Dump Valve 1 B

7 178 454 Air Line, Dump Valve 1 C

8 134 933 Vent Line, Dump Valve 1 D

8 178 453 Vent Line, Dump Valve 1 E

9 971 400 Connector, Elbow, Male, 1/4 Tube x 1/8 NPT 1

10 972 090 Connector, Male, 1/8 x 1/16 NPT 1

11 173 233 Valve Assembly, Pressure Dump 1 F

12 178 368 Base Plate, Low Level Indicator 1 G

13 178 367 Tank Cover 1 G

14 274 511 Gasket, Tank 1 G

15 900 348 Lubricant, Never-Seez --

NOTE A: Input air to solenoidB: Input air to dump valve; service kit P/N 179 609C: Input air to dump valve; service kit P/N 179 608D: Dump valve vent line; service kit P/N 179 609E: Dump valve vent line; service kit P/N 179 608F: See separate parts list and illustrationG: Only for units with low level indicator; service kit P/N 179 608

Pressure Dump ValveService Kit Parts List(Kit P/N 179 609 andKit P/N 179 608)




P/N 108 836C

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Fig. 16 Pressure Dump Valve Service Kit (for Series 2300 Applicators)




P/N 108 836C

Item Part Description Quantity Note

1 900 223 Lubricant, O-Ring --

2 117 544 Seal, Spring, 1/8 x 7/16 x 3/32 PTFE 1

3 144 892 Spring, Compression 1

4 172 975 Body, Valve, Pressure Dump 1

5 172 996 Cap, Valve, Pressure Dump 1

6 172 997 Body, Screw, Valve, Pressure Dump 1

7 172 998 Block, Pivot, Valve, Pressure Dump 1


9 272 290 Needle w/Piston, H-200 1

10 -- Not Used --

11 -- Not Used --

12 276 115 Seat w/Carbide, H-200 1

13 276 229 Seal, Hat, Unformed 2

14 750 162 Ball 1

15 750 164 Screw, Adjustment 1

16 940 101 O-Ring, Viton, 1/4 in. ID x 1/16 in. 2




20 981 070 Screw, Slotted, Oval Head 4

21 982 027 Screw, Cap, Socket Head 4

22 982 374 Screw, Cap, Socket Head 2

23 983 012 Disc, Seal Support 2

24 986 035 Ring, Retaining, External 2

25 986 502 Retaining Ring, Internal, Push-on 1


Pressure Dump Valve Parts List(P/N 173 233)




P/N 108 836C

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Fig. 17 Pressure Dump Valve




P/N 108 836C

Viton is a registered trademark of E.I. DuPont de Nemours & Co.

Nordson and the Nordson logo are registered trademarks of Nordson Corporation.

pressure dump valve service kit for series 2300...

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