Instruction Sheet Pressure Dump Valve Service Kit for Series 00 Units. Overview The Nordson pressure dump valve is used to relieve hydraulic pressure instantly in Series 00 applicator tanks when the unit circuit breaker is turned off. Otherwise, you must trigger one or more guns and open the applicator 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 relief valve in its assembly. Fig. Main Components of the Pressure Relief Dump Valve Assembly. Standard pressure relief valve mechanism. Pressure dump valve mechanism. Valve screw body 4064 There are two pressure dump valve service kits for Series 00 applicators: S Series 00 units without the low level indicator, kit P/N 79 609 S Series 00 units with the low level indicator, kit P/N 79 608 This instruction sheet covers both kits.
Pressure Dump Valve Service Kit. Overview (contd.) The pressure dump valve uses compressed air from the applicator to maintain hydraulic pressure. During normal operation, molten adhesive from the tank flows up the central channel of the valve screw body and into the attached valve body. Compressed air from the applicator forces a piston-stem-ball assembly inside the valve body down against a nozzle seat. This keeps the valve closed, prevents hot melt adhesive from leaving the valve, and maintains system pressure. 5 4 6 400-A Fig. Pressure Dump Valve During Normal Operation. Piston (in DOWN position) 4. Hot melt adhesive. Spring 5. Pressure dump valve body. Ball valve (in CLOSED position) 6. Nozzle seat Note: Arrow indicates air flow and downward movement of piston-stem-ball assembly.
Pressure Dump Valve Service Kit. Overview (contd.) When the applicator circuit breaker is turned off and air pressure is exhausted, the spring-loaded piston-stem-ball assembly is forced up and away from the nozzle seat. This allows molten adhesive in the valve screw body to flow immediately through a central channel in the valve body, out from the bottom of the valve, and into the tank. 5 4 6 Fig. Pressure Dump Valve with Unit Shut Down. Piston (in UP position) 4. Hot melt adhesive. Spring 5. Pressure dump valve body. Ball valve (in OPEN position) 6. Nozzle seat Note: Arrow indicates air flow and upward movement of piston-stem-ball assembly. 4004-A
4 Pressure Dump Valve Service Kit. Installing the Pressure Dump Valve WARNING: Allow only qualified personnel to perform the following tasks. Observe and follow the safety instructions in the Safety Instructions section of the applicator manual. The pressure dump valve can be installed on Series 00 applicators with or without Nordson low level indicator kits. Refer to the Nordson product manual as needed when locating components named in the following procedure. Required Tools and Materials S S S S Flat head screwdriver Open end wrenches Socket wrench Torque wrench Replacing the Solenoid. Drain the applicator tank of as much hot melt adhesive as possible.. Switch the applicator circuit breaker OFF, then disconnect and lock out electrical power from the applicator. WARNING: Risk of electrical shock. The applicator contains energized components with potentials that could cause death. Disconnect and lock out input power before continuing with this procedure.. Allow any remaining hot melt adhesive in the tank to cool but not solidify.
Pressure Dump Valve Service Kit 5 Replacing the Solenoid (contd.) 4. Use a socket wrench to remove the existing pressure relief valve from the tank. Do not remove the screen from the bottom of the tank. 4000 Fig. 4 Existing Pressure Relief Valve Location. Tank. 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 air supply to the regulator. Fig. 5 Setting the Pump Air Pressure to 0 404
6 Pressure Dump Valve Service Kit Replacing the Solenoid (contd.) 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 connector from the front of the solenoid valve. 9. Unplug the solenoid electrical connector from its wiring harness, then remove and discard the solenoid valve. 7 6 4 5 40008 Fig. 6 Existing Air Line and Solenoid Valve Details. Solenoid air line 5. Pipe nipple. Male connector 6. Air control valve. Elbow connector 7. Solenoid electrical connector 4. Solenoid valve
Pressure Dump Valve Service Kit 7 Replacing the Solenoid (contd.) 0. Replace the existing single pipe nipple in the front of the air control valve with the two steel nipples, tee fitting, and male connector from this service kit. The base of the tee should point straight down.. Install the new solenoid valve from this service kit on the outer steel nipple. Do not plug the solenoid electrical connector into its wiring harness yet.. Install a new elbow connector from this service kit in the new solenoid. 7 4 5 6 4008-A Fig. 7 New Air Line and Solenoid Valve Details. Steel nipple 5. Elbow connector. Tee fitting 6. Solenoid air line. Male connector 7. Solenoid electrical connector 4. Solenoid valve
8 Pressure Dump Valve Service Kit Replacing the Solenoid (contd.). Remove the hex nut and ferrule from the new connector. 4. Insert the end of the new solenoid input air line from this service kit through the hex nut, then slide the ferrule onto the end of the air line. 5. Align the end of the new solenoid input air line with the elbow connector. 6. Use an open end wrench to tighten the hex nut onto the elbow connector. 4 40644 Fig. 8 Typical Connector and Air Line Details. Connector. Ferrule. Air line 4. Hex nut 7. Install a new male connector from this service kit in the base of the pump mount. See Figure 7. 8. Use the method described in steps -6 to attach the other end of the new solenoid input air line to the male connector in the base of the pump mount.
Pressure Dump Valve Service Kit 9 Modifying the Low Level Indicator and Replacing the Tank Cover NOTE: If your applicator does not have the low level indicator installed, skip this procedure.. Disconnect the factory input air line from the base of the pump mount.. Remove the screws and washers that secure the pump mount to the applicator.. Rotate the pump slightly in a circular motion to break the suction, then pull the pump straight up to disengage the crossover tube from the manifold. 4. Disconnect the applicator wiring harness from the two connectors at the top of the low level indicator bracket. 5. Remove the screws and washers that secure the low level indicator base plate to the tank cover, then carefully lift the low level indicator assembly away from the unit. 6. Replace the low level indicator base plate with the new one from this service kit. 40009 Fig. 9 Low Level Indicator Details. Wiring harness and connectors. Low level indicator assembly. Base plate
0 Pressure Dump Valve Service Kit Modifying the Low Level Indicator and Replacing the Tank Cover (contd.) 7. Loosen the captive screw on top of the electrical cabinet cover, then lift the cover away. 8. Remove the seven screws that secure the tank enclosure, then lift away the tank enclosure, tank cover, and tank gasket. 9. Replace the tank gasket with a new one from this service kit, then install the replacement tank cover from this service kit. Fig. 0 Tank, Tank Cover, and Gasket Details. Tank cover. Tank. Tank gasket 400 0. Reinstall the tank enclosure and secure it in place with the seven screws removed in step 8.. Reinstall the electrical cabinet cover.. Reinstall the pump and reconnect the factory input air line to the base of the pump mount.. Reinstall the low level indicator assembly. 4. Reconnect the applicator wiring harness to the two connectors at the top of the low level indicator bracket. See Figure 9.
Pressure Dump Valve Service Kit Installing the Pressure Dump Valve. Plug the solenoid electrical connector into its wiring harness socket.. Ensure that all connections are tight.. Power up the unit and allow it to reach application temperature. 4. Apply Never-Seez lubricant to the pressure dump valve threads, then install 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 the pressure dump valve to -4 NSm (8-0 ft-lb). 6. Position the pressure dump valve so that it is oriented at approximately a 45-degree angle to the front of the tank. 45 o 4000 Fig. Correct Orientation of the Pressure Dump Valve. Pump. Tank opening. Pressure dump valve
Pressure Dump Valve Service Kit Installing the Pressure Dump Valve (contd.) 7. If your unit does not have a low level indicator, carefully pry the plug from the existing hole in the tank cover in front of the pump. Thread the dump valve input air line from this service kit through this hole in the tank cover, then go to step 7. Otherwise go to step 6. 7 5 4 6 Fig. Dump Valve Air Line Details for Units without Low level Indicator. Dump valve input air line 5. Dump valve vent line. Tee fitting 6. Male connector. Elbow connector 7. Hex flats 4. Dump valve 400
Pressure Dump Valve Service Kit Installing the Pressure Dump Valve (contd.) 8. If your unit has a low level indicator, thread the new metal dump valve input air line from this service kit through the hole in the tank cover at the notch in the low level indicator base plate. 9. Locate the connector at the top of the pressure dump valve. 5 7 4 6 Fig. Dump Valve Air Line Details for Units with Low level Indicator. Dump valve input air line 5. Dump valve vent line. Tee fitting 6. Male connector. Elbow connector 7. Hex flats 4. Dump valve 4009-A
4 Pressure Dump Valve Service Kit Installing the Pressure Dump Valve (contd.) 0. Remove the hex nut and ferrule from the connector.. Insert the end of the air line through the hex nut, then slide the ferrule onto the end of the air line.. Align the end of the air line with the elbow connector on the pressure dump valve.. Use an open end wrench to tighten the hex nut onto the elbow connector. Do not overtighten the hex nut. 4 40644 Fig. 4 Typical Connector and Air Line Details. Connector. Ferrule. Air line 4. Hex nut 4. Repeat steps 8- to attach the other end of the dump valve input air line to the tee fitting between the pump air valve and solenoid. NOTE: You may have to adjust the elbow connector on the pressure dump valve slightly to allow for proper routing of the air line. 5. Thread the new / 8 inch metal dump valve vent line through the same hole in the tank cover as the input air line to the pressure dump valve. 6. Repeat steps 8- to attach this dump valve vent line to the male connector on the side of the valve body inside the tank. Do not overtighten the connector hex nut.
Pressure Dump Valve Service Kit 5 Installing the Pressure Dump Valve (contd.) 7. Ensure that the dump valve vent line opening is unblocked. 8. Reinstall the pump cover. 9. Fill the tank with adhesive and proceed with normal operation. The pressure dump valve was designed to operate while submerged.. Operation The pressure dump valve works automatically. When you switch the applicator circuit breaker ON and set the applicator air pressure at the filter/regulator, air is directed through the solenoid, to the pump air valve, and to the pressure dump valve piston. As long as the applicator circuit breaker is switched ON, system air pressure is maintained and the piston remains in the DOWN position, keeping the valve closed. When you switch the applicator circuit breaker OFF, system air pressure is relieved and the pressure dump valve piston is forced up by the spring. This upward movement by the piston allows the pressure dump valve to open and relieve hydraulic pressure inside the manifold. A backup pressure relief valve in the pressure dump valve mounting stem automatically vents material through a hole in the side of the valve if the hydraulic pressure exceeds,600 psi (,0 kpa). 4. Maintenance No periodic maintenance is required. The pressure dump valve requires service only if: S S the valve fails to relieve hydraulic pressure when the applicator circuit breaker is switched OFF the valve fails to close and hold hydraulic pressure during normal operation In either case, contact your Nordson representative for the items required to properly repair the pressure dump valve.
6 Pressure Dump Valve Service Kit 5. Troubleshooting To check for hydraulic pressure, trigger a gun and check for hot melt material output. If the unit had been operating correctly prior to the installation of the pressure dump valve, but has little or no hydraulic pressure now, the probable cause is either the pressure dump valve itself or one of its components. Problem Possible Cause Corrective Action Refer to No or little adhesive output due to insufficient hydraulic pressure Not enough air pressure to keep pressure dump valve piston in DOWN position Pressure dump valve incorrectly installed in tank bottom Ensure that the input air pressure is set correctly Review the pressure dump valve installation steps Series 00 manual Installing the Pressure Dump Valve procedure in this publication Loose air line connections Review air line installation steps Replacing the Solenoid and Installing the Pressure Dump Valve procedures in this publication Faulty pressure dump valve Replace the pressure dump valve Removing the Pressure Dump Valve and Installing the Pressure Dump Valve procedures in this publication
Pressure Dump Valve Service Kit 7 6. Removing the Pressure Dump Valve Complete this procedure if the pressure dump valve must be removed for any reason.. Drain the applicator tank of as much hot melt adhesive as possible.. Switch the applicator circuit breaker OFF, then disconnect and lock out electrical power from the applicator. WARNING: Risk of electrical shock. The applicator contains energized components with potentials that could cause death. Disconnect and lock out input power before continuing with this procedure.. Allow any remaining hot melt adhesive in the tank to cool but not solidify. 4. Remove the pump cover. To prevent damage to the pump, do not rock the cover back and forth. 5. Set the pump air pressure regulator to 0 psi/kpa, then turn off the air supply to the regulator. 6. Disconnect and remove the dump valve vent line from the male connector on the side of the pressure dump valve body. 7. Disconnect the input air line from the male elbow connector at the top of the valve body.
8 Pressure Dump Valve Service Kit 6. Removing the Pressure Dump Valve (contd.) 8. Disconnect the other end of this air line from the tee fitting between the solenoid and the pump air valve. 9. Use a socket wrench on the valve screw body hex flats to remove the pressure dump valve from the tank bottom. 5 7 4 6 4009-A Fig. 5 Dump Valve Air Line Details (Typical). Dump valve input air line 5. Dump valve vent line. Tee fitting 6. Male connector. Male elbow connector 7. Hex flats 4. Dump valve
Pressure Dump Valve Service Kit 9 7. Illustrated Parts Lists Item Number Column The number in the Item column is the number assigned to the part in the accompanying illustration. Part Number Column The six-digit number in the Part column is the Nordson Corporation part number assigned to that part. Description Column The Description column gives the Nordson Corporation name of the part, along with its dimensions and other physical properties, where appropriate. Quantity Column 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 applied directly to o-rings. Note Column A letter in the Note column refers to a note at the end of the parts list which gives additional information about the part.
0 Pressure Dump Valve Service Kit Pressure Dump Valve Service Kit Parts List (Kit P/N 79 609 and Kit P/N 79 608) Service kit P/N 79 609 applies to all Series 00 units without the Low Level Indicator. Service kit P/N 79 608 applies to all Series 00 units with the Low Level Indicator. Item Part Description Quantity Note 79 667 Valve, Solenoid, -Way, Dump Valve 97 000 Nipple, Steel 97 50 Fitting, Tee, Pipe, Hydraulic, / 8 4 97 00 Connector, Elbow, Male, SAE, Stainless Steel, / 4 x 7 / 6-0 5 4 59 Air Line, Solenoid A 6 97 5 Connector, Male, / 4 Tube x / 8 NPT 7 4 90 Air Line, Dump Valve B 7 78 454 Air Line, Dump Valve C 8 4 9 Vent Line, Dump Valve D 8 78 45 Vent Line, Dump Valve E 9 97 400 Connector, Elbow, Male, / 4 Tube x / 8 NPT 0 97 090 Connector, Male, / 8 x / 6 NPT 7 Valve Assembly, Pressure Dump F 78 68 Base Plate, Low Level Indicator G 78 67 Tank Cover G 4 74 5 Gasket, Tank G 5 900 48 Lubricant, Never-Seez -- NOTE A: Input air to solenoid B: Input air to dump valve; service kit P/N 79 609 C: Input air to dump valve; service kit P/N 79 608 D: Dump valve vent line; service kit P/N 79 609 E: Dump valve vent line; service kit P/N 79 608 F: See separate parts list and illustration G: Only for units with low level indicator; service kit P/N 79 608
Pressure Dump Valve Service Kit 9 6 7 5 6 4 8 4 0 5 Fig. 6 Pressure Dump Valve Service Kit (for Series 00 Applicators) 4005-A
Pressure Dump Valve Service Kit Pressure Dump Valve Parts List (P/N 7 ) Item Part Description Quantity Note 900 Lubricant, O-Ring -- 7 544 Seal, Spring, / 8 x 7 / 6 x / PTFE 44 89 Spring, Compression 4 7 975 Body, Valve, Pressure Dump 5 7 996 Cap, Valve, Pressure Dump 6 7 997 Body, Screw, Valve, Pressure Dump 7 7 998 Block, Pivot, Valve, Pressure Dump 8 7 Spring, Compression 9 7 90 Needle w/piston, H-00 0 -- Not Used -- -- Not Used -- 76 5 Seat w/carbide, H-00 76 9 Seal, Hat, Unformed 4 750 6 Ball 5 750 64 Screw, Adjustment 6 940 0 O-Ring, Viton, / 4 in. ID x / 6 in. 7 940 O-Ring, Viton, / 8 in. ID x / 6 in. 8 940 O-Ring, Viton, 7 / 6 in. ID x / 6 in. 6 9 940 O-Ring, Viton, 5 / 6 in. ID x / 6 in. 0 98 070 Screw, Slotted, Oval Head 4 98 07 Screw, Cap, Socket Head 4 98 74 Screw, Cap, Socket Head 98 0 Disc, Seal Support 4 986 05 Ring, Retaining, External 5 986 50 Retaining Ring, Internal, Push-on 6 987 0 Spring, Compression
Pressure Dump Valve Service Kit 5 A A 7 5 6 8 4 6 9 8 4 8 4 4 6 0 7 9 6 4006-B Fig. 7 Pressure Dump Valve
4 Pressure Dump Valve Service Kit Viton is a registered trademark of E.I. DuPont de Nemours & Co. Nordson and the Nordson logo are registered trademarks of Nordson Corporation.