TWO COMPONENT SYSTEM METERING VALVE

Transcription

1 TWO COMPONENT SYSTEM METERING VALVE Part NORDSON CORPORATION AMHERST, OHIO USA

2 Nordson Corporation welcomes requests for information, comments and inquiries about its products. Address all correspondence to Nordson Corporation 555 Jackson Street Amherst, OH Notice This is a Nordson Corporation publication which is protected by copyright. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Nordson Corporation. The information contained in this publication is subject to change without notice. Trademarks 100 Plus, Blue Box, ChromaFlex, CleanSleeve, CleanSpray, Cross-Cut, Easy Coat, Econo-Coat, Flow Sentry, Isocoil, Isocore, Iso-Flo, Nordson, the Nordson logo, PRX, Pro-Flo, RBX, Ready-Coat, Rhino, Select Coat, Shur-Lok, Smart Spray, System Sentry, Thread Coat, Tribomatic, and Versa-Spray are registered trademarks of Nordson Corporation. CPX, CanWorks, Control Coat, Excel 2000, PowderGrid, Pulse Spray, SCF, Select Cure, Versa-Coat, Versa Screen, and Package of Values are trademarks of Nordson Corporation.

3 Table of Contents i Table of Contents Safety Introduction Explanation Of Terms And Symbols Installation Safety Electrical Pneumatic Operation Safety Servicing Safety Using Adhesives, Sealants, and Solvents Safely Halogenated Hydrocarbon Solvents Fluid Injection Hazard Description Introduction Description Theory of Operation Installation Inspection Installation Metering Valve Mounting Cable Connections Supply Air Connection Valve Purging Operation Introduction Purging the Material Supply Circuit Maintenance General

4 ii Table of Contents Troubleshooting Introduction Repair Introduction Removing Metering Valve from Metering Unit Metering Valve Repair Procedures Replacing the Pressure Transducer Replacing the Trimset Valve Replacing the Trimset Valve Bonnet Replacing the Actuator Body Installing Metering Valve On Metering Unit Parts Introduction Use of the Illustrated Parts List Common Service Parts Specifications Dimensions Weight Air Pressure Fluid Pressure Rating, Static Operating Temperature Of Material Material Viscosity Range Flow Range

5 Section 1 Safety

6 1-0 Safety

7 Safety 1-1 Section 1 Safety 1. Introduction This section contains safety guidelines for using Nordson equipment. These guidelines must be followed by anyone working with Nordson equipment, including operations and service personnel. They are repeated throughout this manual, along with specific Two Component System warnings and cautions not included in this section. These safety guidelines cover: installation equipment operation working with adhesives and sealants use of cleaning and flushing solvents Failure to follow these recommendations may result in personal injury from toxic or allergic reactions or electrocution and/or equipment and property damage. 2. Explanation of Terms and Symbols The following safety symbols and signal words are used throughout this publication to alert the reader to personal safety hazards or to identify conditions that may result in equipment or property damage. WARNING: General warning. Failure to observe may result in personal injury or death. WARNING: Risk of electrical shock. Failure to observe may result in personal injury or death. CAUTION: General caution. Failure to observe may result in equipment damage.

8 1-2 Safety 3. Installation Safety Electrical To prevent possible electrical shock, be sure to install a protective ground connection between this equipment and a reliable earth ground. Install a disconnect switch (with lockout capability) between the power source and the equipment. Make sure the power supply wire gauge and insulation are sufficient to meet the temperature and power requirements. Use only the correct type of fuses with the proper voltage rating, and current rating. Using incorrect fuses could create a fire hazard. Remove all jewelry before servicing Nordson equipment. Pneumatic Nordson recommends installing a three-way, manual lockout valve in the air supply line prior to the filter/regulator. This valve allows the operator to relieve and lock out air pressure to prevent pneumatic system use during maintenance or repair. 4. Operation Safety Do not operate Nordson equipment under the following conditions: at a pressure higher than the rated maximum working pressure of any component in the system near volatile or otherwise explosive gases or materials without properly installed covers, panels, and safety guards at ambient temperatures below 20 F (-6 C) or above 120 F (50 C) with hoses in contact with a cold floor, cold supports or other such surfaces. Cold points along the hose restrict the flow of adhesive inside the hose and can create potential problems during operation. in an improper manner. Use the equipment only for the purpose that has been designated by Nordson Corporation. with hoses routed so that they are prone to damage from kinking, abrasion and other physical damage. As a rule, do not allow a hose to be installed with a bend radius of less than 6 in. (15 cm).

9 Safety Servicing Safety When performing internal service or adjustment on any equipment, make sure another person capable of rendering emergency first aid and CPR is present. Do not allow any unqualified personnel to service Nordson equipment. Be careful around energized circuits, and treat all circuits as though they were live. Never touch exposed connections and components while power is ON, or personal injury could result. Dangerous voltages exist at several points in the equipment. Disconnect, lock out and tag external electrical power before removing protective panels or replacing electrical components. If possible, stand on a rubber mat when servicing Nordson equipment. Do not work on equipment if standing water is present. Avoid working in a high-humidity atmosphere. Cover exposed terminals and work area with rubber sheeting to avoid accidental contact while the power is ON. Always wear safety glasses, protective gloves and long-sleeved protective clothing to prevent contact with adhesives, sealants, and solvents. Always shut off the pump(s) and relieve system hydraulic pressure (trigger the gun) before opening any hydraulic fitting or connection. Otherwise, personal injury could result. Never use an open torch, drill, or broach when cleaning a gun nozzle. Never continue to operate equipment with a known hydraulic or pneumatic leak in the system. 6. Using Adhesives, Sealants, and Solvents Safely Use extreme care when working with adhesives, sealants, and solvents. Always wear protective clothing and eye protection when handling these materials and when working near equipment containing these items under pressure. Refer to the Material Safety Data Sheets (MSDS) for the material manufacturer s warnings and recommendations concerning safe use and proper storage of these materials. If a cleaning and flushing solvent requires heating prior to use, use only a controlled heating device such as a small deep fat fryer or thermostatically-controlled hot plate.

10 1-4 Safety 6. Using Adhesives, Sealants, and Solvents Safely (contd.) Do not use paint-type solvents under any circumstances! These solvents are volatile and may create a fire and/or toxic vapor hazard even at room temperature. Always be sure the work area is adequately ventilated. Avoid prolonged or repeated breathing of solvent vapors. Halogenated Hydrocarbon Solvents Halogenated hydrocarbon solvents are dangerous if used to clean aluminum components in a pressurized fluid system. No available stabilizers prevent halogenated hydrocarbon solvents from reacting with aluminum components in a pressurized fluid pumping system. Never clean any aluminum component or flush any system using halogenated hydrocarbon solvents. Contact your solvent or material supplier for a non-halogenated hydrocarbon solvent for cleaning and flushing. Halogenated fluids include the following solvents listed in table 1-1. Table 1-1 Halogenated Hydrocarbon Solvents Fluorocarbon Solvents Chlorinated Solvents Brominated Solvents Iodinated Solvents Dichlorofluoromethane Carbon Tetrachloride Ethylene Dibromide Ethyl Iodide Trichlorofluoromethane Chloroform Methyl Bromide Methyl Iodide Freon Ethylene Dichloride Methylene Chlorobromide N-butyl Iodide Methylene Chloride Propyl Iodide Trichloroethane Monochlorobenzene Orthodichlorobenzene Perchloroethylene Trichloroethylene

11 Safety 1-5 Fluid Injection Hazard 1. Always handle a dispensing gun as carefully as a loaded firearm. 2. Never point the gun at yourself or anyone else. The high pressure fluid jet from the gun nozzle can penetrate the skin and inject fluid into the body. 3. Never place your hand, fingers, or body near the nozzle tip. 4. Never back-flush the nozzle tip. This practice involves placing a rag or similar item over the tip (with the pump system pressurized), and triggering the gun to increase fluid pressure at the nozzle tip. Instead, perform the following steps: a. Shut off and lock out all pumps in the system. b. Relieve system pressure. Trigger the dispensing gun to relieve nozzle pressure. c. Carefully remove and clean nozzle with a compatible solvent. 5. Never go near an identified hose leak. The high pressure fluid jet from a hose leak can penetrate the skin and result in the injection of fluid into the body. 6. Always relieve system pressure before servicing equipment. Trigger all guns and bleed off system pressure. 7. Nordson recommends that all users of dispensing equipment carry a NSEMA wallet card to give to the doctor in the event of an injection injury. Nordson supplies these cards with the equipment, and additional cards are available free from Nordson Corporation. 8. If an injection injury occurs, perform the following steps: a. Quickly find out what fluid was injected and seek immediate medical care at a hospital emergency room. Do not treat this injury as if it was a simple cut! b. Present the NSEMA wallet card to the doctor, and tell the doctor that you have an injection injury. c. Tell the doctor what fluid was injected.

12 1-6 Safety

13 Section 2 Description

14 2-0 Description

15 Description 2-1 Section 2 Description 1. Introduction The Nordson Two Component System Metering Valve is used in the metering unit of your system for precise proportional metering of temperature-controlled, two component materials. The metering unit interfaces with the robot controller, Nordson Programmable Logic Controller (PLC), and Nordson digital controller to precisely control material output to the gun. The digital controller adjusts material flow to the gun so that it is proportional to robot speed and material delivery pressure. The digital controller uses feedback from sensors and the robot controller to control the metering process. The digital controller can precisely control material deposition by compensating for changes in robot speed and material delivery pressure. 2. Description See Figure 2-1. The metering valve has the following standard components: exhaust muffler (1) at the side of the valve pressure transducer cordset (2) that allows for single-point cable connection at the actuator actuator (3) that regulates the opening and closing of the metering valve air manifold (4) that supplies operating air to the valve trimset valve (5) that is opened/closed for precise control of the material bead 1994 Nordson Corporation

16 2-2 Description 2. Description (contd.) A Figure 2-1 Two component system metering valve 1. Muffler 3. Actuator 2. Cordset 4. Air manifold 5. Trimset valve

17 Description 2-3 Theory of Operation The digital controller monitors robot speed and material pressure to control the flow of material from the metering unit and to the gun. The robot controller sends an analog signal (that is directly proportional to robot speed) to the digital controller. The digital controller uses a pressure transducer in the trimset valve (upstream of stem and seat) to sense material pressure and sends a low current output signal to the actuator. See Figure 2-2. The actuator (1) controls the degree to which the trimset valve (2) opens by adjusting air flow to one side or the other of the piston (3) A Figure 2-2 Cutaway view of the metering valve assembly 1. Actuator 4. Inlet port 2. Trimset valve 5. Stem and seat 3. Piston 6. Outlet port 7. Coil 8. Magnet

18 2-4 Description Theory of Operation (contd.) Material enters the valve at an inlet port (4) ahead of the stem and seat (5). When the actuator opens the valve, the material flows between the stem and seat, to the outlet port (6) of the trimset valve (2), and on to the dispensing gun. A coil (7) and magnet (8) in the top of the metering valve provide the digital controller with a precise feedback signal. The controller uses this signal to provide fine control of valve operation.

19 Section 3 Installation

20 3-0 Installation

21 Installation 3-1 Section 3 Installation 1. Inspection Make sure that all fasteners and connectors on the valve are tight. Inspect the metering valve for any signs of damage. If there is damage to any component, contact a Nordson representative immediately. 2. Installation WARNING: To prevent serious injury to personnel and/or damage to equipment, ensure all power to the robot controller has been shut off and locked out. Make sure all pneumatic and material pressures have been relieved or bled off before installing the metering valve on the metering unit. Metering Valve Mounting See Figure 3-1 for dimensioning information in. (114.3 mm) 3.58 in. (90.93 mm) 1.25 in. ( mm) 2.93 in. (74.42 mm) 3.20 in. (81.28 mm) A Figure 3-1 Valve assembly dimensions

22 3-2 Installation Metering Valve Mounting (contd.) See Figure 3-2. Mounting the metering valve (1) to the metering unit (2) requires four #10-32 x 2.5-in. socket head cap screws (3) and two O-rings (4). The two O-rings seal the inlet and outlet ports between the trimset valve (5) and the metering unit (2) A Figure 3-2 Connection requirements 1. Metering valve assembly 2. Metering unit 3. Cap screws 4. O-rings 5. Trimset valve 6. Cable connector 7. Actuator 8. Tube Cable Connections See Figure 3-2. The metering unit (2) has a cable connector (6) that attaches to the actuator (7) of the metering valve. Both the cable connector (6) and actuator (7) are keyed to ensure proper connection.

23 Installation 3-3 Supply Air Connection See Figure 3-2. A tube (8) from the metering unit (2) to the metering valve assembly (1) provides supply air from an air intensifier. The air intensifier requires an air supply of at least 80 psi (5.52 bar). The metering valve assembly (1) will not operate properly at a lower pressure. Performance improves when the air supply pressure reaches a maximum of 100 psi (6.90 bar). Valve Purging Before operation, the dispensing gun must be purged. This helps ensure that no trapped air remains in the trimset valve often a source of erroneous transducer readings. Trapped air could also release unexpectedly and cause an irregular burst of material and air from the dispensing gun nozzle. Contact Nordson Corporation for the procedure to purge the dispensing gun Nordson Corporation

24 3-4 Installation

25 Section 4 Operation

26 4-0 Operation

27 Operation 4-1 Section 4 Operation 1. Introduction The Two Component System metering valve has no operating controls of its own. Valve operation is controlled by a Nordson digital controller, along with the robot controller and Programmable Logic Controller (PLC). Before operating the system, the operator must read the system manual and be familiar with the operating characteristics of each component in the system. A thorough understanding of system operation will help the user to make the proper system settings to obtain desired results. Make sure that sufficient air pressure is available for proper metering valve and dispensing gun operation. Check material pressure and make sure it is adequate for good gun response and correct bead characteristics. 2. Purging the Material Supply Circuit After the metering unit is installed, the system must be purged to remove air from the metering circuits, material hoses, and dispensing gun. Before purging the system, make sure the gun is over a material waste container. If you make any changes to the material supply circuit, you must be purge the system just before production use. If the system has not cycled recently, you will probably need to change the nozzle before purging. NOTE: The purge function for your system may have been programmed into the cycle of the system, or may have to be initiated from a remote purge panel. Purge the dispensing gun until material flows freely from the nozzle and all air is relieved from the material circuit.

28 4-2 Operation

29 Section 5 Maintenance

30 5-0 Maintenance

31 Maintenance 5-1 Section 5 Maintenance 1. General The Two Component System metering valve is designed to provide efficient operation when you follow a preventive maintenance schedule. The following schedule must be performed at the specified intervals to prevent inefficient system operation and unnecessary downtime. WARNING: Do not loosen any hydraulic or pneumatic fitting or connection without first relieving system pressure. Otherwise, personal injury could result. WARNING: Wear protective clothing, safety glasses, and safety gloves, to prevent injury from material under pressure. System Component Valve Mounting Check for loose valve and tighten if necessary. Material Shelf Life Check for expired material. Cable Condition Check for loose connectors and damage. Bonnet Condition Check for leaking bonnet. Pressure Transducer Remove and clean the transducer. Pneumatic Filter/Regulator Clean and drain filter. Pneumatic Filter/Regulator Change filter (if necessary). Pneumatic Filter/Regulator Check regulator setting and adjust, if necessary. Air Supply Check tubing and connectors. Frequency of Maintenance Daily Weekly Monthly Quarterly X X X X X X X X

32 5-2 Maintenance

33 Section 6 Troubleshooting

34 6-0 Troubleshooting

35 Troubleshooting 6-1 Section 6 Troubleshooting 1. Introduction This section contains procedures and diagrams for troubleshooting the two component system metering valve. Many faults may have an electrical, pneumatic, hydraulic, or mechanical reason for occurring, so check all possible causes for any given fault. Before troubleshooting, refer to the Section 1, Safety. Read and follow all safety precautions before starting work. WARNING: Disconnect power, shut down each material supply pump, and relieve air pressure and fluid pressure before performing any troubleshooting procedures. Troubleshooting procedures must be performed by qualified personnel observing standard safety practices. Problem Possible Cause Corrective Action Refer to 1. Gun does not dispense material. No material pressure to gun Blockage at dispensing gun nozzle. Controller may indicate FULL CLOSED and/or OVERPRESSURE. Ensure pump air motor is ON. Increase air motor pneumatic pressure as required. Perform the following steps: a. Shut off air pressure to each material supply pump. Page 4-1 b. Purge the system to remove material pressure from the gun. c. Shut off all power to the system. d. Remove the dispensing gun nozzle. e. Purge the dispensing gun. Wipe any excess material from the gun. Page 4-1 f. Install a new nozzle insert. Purge the gun before production use Nordson Corporation

36 6-2 Troubleshooting 1. Introduction (contd.) Problem Possible Cause Corrective Action Refer to 1. Gun does not dispense material. (contd.) Blockage at the trimset valve seat. Gun goes FULL OPEN and no OVERPRESSURE noted by the controller. If the gun is FULL OPEN and controller does not indicate OVERPRESSURE: a. Shut off air pressure to material supply pump. Refer to pump manual if required. Manual 24-2 or Manual 24-4 b. Carefully bleed off pressure, using the pump bleed valve. c. Shut off all power to the system. CAUTION: Do not use solvent on the bonnet. Solvents can damage seals. d. Remove the metering valve. Page 7-1 e. Remove the trimset valve and remove bonnet. Clean the valve, stem, and seat with solvent. f. Assemble the valve, install the valve on the metering unit, and turn on the system. Check system operation Page 7-5 Page 7-9 WARNING: Shut down the system and bleed off material pressure before disconnecting hoses. Serious injury could result from disconnecting a pressurized hose. Blockage upstream from gun Servo actuator malfunction, or valve stem binding (Valve does not open.) Starting at the pump and working toward the gun, disconnect the material supply hoses. Turn ON the pump and check for flow. Make sure to shut off pump and relieve pressure between checks. Turn OFF material supply. Leave the servo actuator air supply ON. Try to actuate the valve to relieve pressure. If the stem is binding at the bonnet, replace the bonnet. If there is no binding, replace the actuator body. If the valve stem is binding, check for a bent actuator frame. Replace the actuator if necessary. Page 7-5 Page Nordson Corporation

37 Troubleshooting Introduction (contd.) Problem Possible Cause Corrective Action Refer to 1. Gun does not dispense material. (contd.) No air supply to manifold (Valve will not open.) Check air line. If o.k., turn OFF the air and disconnect the air line. Turn on the air and check for flow. If no air flows from line, check the air supply. Repair as necessary. No air supply to manifold (Valve will not open.) Check air line. If o.k., turn OFF the air and disconnect the air line. Turn on the air and check for flow. If no air flows from line, check the air supply. Repair as necessary. Contaminated air or plugged filter, regulator, or muffler Perform the following checks: a. Check the filter and regulator for restrictions. Replace the filter or regulator, if necessary. b. Check that air exhausts from the air manifold muffler on the side of the valve. Replace the muffler if necessary. 2. Gun does not control bead or change bead size in response to signals. Gun goes FULL OPEN. Cordset damage or malfunction Perform the following checks: a. Check cordset connections and connections at the digital controller gun board. Pro-Flo Digital Controller Manual b. Disconnect connector of the pressure transducer cordset. Perform continuity test on the cordset. Repair or replace the cordset if necessary. Figure 6-1 Figure 7-5 Damage to control cable Contact Nordson for information on the cable(s) continuity testing. Pressure transducer malfunction If transducer connector is secure, check feedback (when gun is not actuated) as follows: At the digital controller, check TP5 of the gun controller board for +0.8 to +1.0 volts. If voltage is not o.k., replace transducer. Pro-Flo Digital Controller Manual 1994 Nordson Corporation

38 6-4 Troubleshooting 1. Introduction (contd.) Problem Possible Cause Corrective Action Refer to 3. Gun continues to dispense material after dispensing cycle is over. Controller indicates gun is FULL CLOSED. Valve stem not fully seated PURGE gun to remove foreign material between the valve stem and the seat. Page 4-1 Insufficient pneumatic pressure to fully seat the stem Increase the metering valve and gun air supply to the recommended 80- to 100-psi (5.52- to 6.90-bar) range. Valve stem and seat are worn or damaged Replace the trimset valve. Page Bead deposition wiggles. Nozzle-to-work piece distance or signal lag problem Set dispensing gun height above workpiece and adjust signal lag. Troubleshooting section of Pro-Flo Digital Controller Manual Material velocity through nozzle is higher than gun s linear velocity. Reduce bead size. Check gun performance. Pro-Flo Digital Controller 5. Unplanned change in bead size Material temp., shelf life, or batch problems Correct material problems. Troubleshooting section of Pro-Flo Digital Controller Manual Partial blockage of valve PURGE the gun to clear the blockage. If blockage is not cleared, remove valve and clean thoroughly with acceptable solvent. (Refer to Section 1, Safety Summary.) Page 4-1 Page Bead deposition starts late. Delayed or incorrect gun signal from robot controller Check your robot programming for the proper GUN ON signal and adjust the node point as necessary. Refer to the robot controller manual for procedures Nordson Corporation

39 Troubleshooting Introduction (contd.) Problem Possible Cause Corrective Action Refer to 7. Material leaks from bonnet. Worn bonnet seals Replace the bonnet. Page Insufficient material pressure at valve for application requirements. Controller indicates gun FULL OPEN. Insufficient pneumatic pressure to operate pump, or pump output insufficient. Increase system hydraulic pressure until it reaches the maximum rating of the component with the lowest pressure rating. If this does not correct the problem, contact Nordson for additional help. RED Notch (Socket End) BLACK GUN CONNECTOR END PIN K TRANSDUCER END PIN 45 CCW FROM NOTCH WIRE COLOR RED M 135 CCW FROM NOTCH BLUE L 135 CW FROM NOTCH GREY BLUE GRAY J 45 CW FROM NOTCH BLACK Figure 6-1 Cordset connectors A 1994 Nordson Corporation

40 6-6 Troubleshooting

41 Section 7 Repair

42 7-0 Repair

43 Repair 7-1 Section 7 Repair 1. Introduction The repair procedures described in this section are limited to replacing the actuator body, trimset valve, trimset valve bonnet, cordset, and pressure transducer. NOTE: The trimset valve seat cannot be removed from the trimset valve. The valve stem (needle) and seat are a matched set and cannot be replaced separately. Take care not to damage the stem and seat when cleaning or repairing the trimset valve. 2. Removing Metering Valve from Metering Unit WARNING: To prevent injury to personnel and/or damage to equipment, ensure all power to the robot and Pro-Flo controller has been shut off and locked out, and that all pneumatic and material pressures have been bled off. 1. Shut off the material supply pump and purge the gun to relieve pressure in the material supply hoses and dispensing gun. Contact Nordson Corporation for purge instructions. 2. Shut down and lock out the controls for the Programmable Logic Controller (PLC) and digital controller. 3. Disconnect the air supply tube from the air manifold. 4. Disconnect the gun control cable from the actuator. 5. Remove the four #10-32 x 2.5 cap screws securing the metering valve assembly to the metering unit. 6. Remove the two O-rings held between the metering unit and the trimset valve. Discard the old O-rings. 3. Metering Valve Repair Procedures Perform the following procedures to replace the metering valve components, as required. Additional repair information may be available from your Nordson Service Representative.

44 7-2 Repair Replacing the Pressure Transducer 1. See Figure 7-1. Remove the pressure transducer cover (1) from the trimset valve (2). 2. Unscrew the cordset plug (3) from the pressure transducer (4). 3. Place a wrench on the flats of the pressure transducer (4) and remove it from the trimset valve (2) Perform these steps to install the pressure transducer (4): a. Place a thin coating of grease on the O-ring (5) b. Install the O-ring (5) on the pressure transducer (4). Install and tighten the pressure transducer (4). c. Connect the keyed cordset plug (3) on the pressure transducer (4) and tighten the cordset plug (3). d. Install the pressure transducer cover (1) on the trimset valve (2) A Figure 7-1 Pressure transducer replacement 1. Pressure transducer cover 2. Trimset valve 3. Cordset plug 4. Pressure transducer 5. O-ring Replacing the Trimset Valve 1. Disconnect and remove the metering valve from the metering unit as previously described on page. 2. See Figure 7-2. Loosen the lower two M3 x 8 coupling cap screws (1). 3. Remove the pressure transducer cover (2), and disconnect the cordset plug (3) from the pressure transducer (4). 4. Support the trimset valve (5) and remove the two M5 x 20 socket head cap screws (6) that secure the trimset valve (5) to the actuator body (7). Carefully remove the trimset valve (5) from the actuator body (7). Remove the old stem (8) from the coupling (9) Nordson Corporation

45 Repair 7-3 Replacing the Trimset Valve (contd.) 5. Perform the following steps to install a new trimset valve: a. Remove the new stem (8) from the new trimset (5). Apply a thin coating of grease to the new stem (8). Install the new stem (8) in the coupling (9) until fully seated against the actuator plunger (inside coupling (9)). b. Remove the two loosened M3 x 8 coupling cap screws (1) from the coupling and place a small drop of threadlock adhesive on the threads of each screw. Install each coupling cap screw (1) in the coupling (9). Tighten each coupling cap screw (1) to 10 lb-in. (1.13 N m). c. Install the new trimset valve (5) on the actuator body (7). Tighten the two socket head cap screws (6) to lb-in. ( N m). d. Remove the pressure transducer (4) and O-ring (10) from the old trimset valve (5). e. Using a clean, lint-free cloth, wipe off all components. f. Place a thin coating of grease on the O-ring (10). Install the pressure transducer (4) and O-ring (10) in the new trimset valve (5). g. Install the cordset plug (3) on the pressure transducer (4). Install pressure transducer cover (2) and tighten to 75 lb-in. (8.47 N m). h. Install the metering valve on the metering unit as described at the end of this section.

46 7-4 Repair Replacing the Trimset Valve (contd.) Figure 7-2 Trimset replacement 1. Coupling cap screws 2. Pressure transducer cover 3. Cordset plug 4. Pressure transducer 5. Trimset valve 6. Socket head cap screws 7. Actuator body 8. Stem 4 9. Coupling 10. O-ring A

47 Repair 7-5 Replacing the Trimset Valve Bonnet 1. Shut off the system and relieve the material supply pressure at the pump. Remove the metering valve from the metering unit as previously described on page See Figure 7-3. Remove the pressure transducer cover (1) and disconnect the cordset plug (2) from the pressure transducer (3) Support the trimset valve (4) and remove the two M5 x 20 socket head cap screws (5) that secure the trimset valve (4) to the actuator body (6) Carefully remove the trimset valve (4) from the actuator body (6). (The stem (7) will remain in the coupling (8).) Figure 7-3 Bonnet replacement 1. Pressure transducer cover 2. Cordset plug 3. Pressure transducer 4. Trimset valve 5. Socket head cap screws 6. Actuator body 7. Stem 8. Coupling 9. Bonnet A 5. Clean the stem (7) and lightly coat it with grease. 6. Remove the old bonnet (9) from the trimset valve (4). 7. Place a thin coating of grease on the internal and external O-rings of the bonnet (9). Install the bonnet (9) in the trimset valve (4) until it is fully seated. 8. Install the trimset valve (4) on the actuator body (6). Tighten the two M5 x 20 socket head cap screws (5) to 75 lb-in. (8.47 N m). 9. Install the cordset plug (2) on the pressure transducer (3). Install the pressure transducer cover (1) and tighten the two M5 x 16 socket head cap screws to 75 lb-in. (8.47 N m). Replacing the Actuator Body 1. Shut off the system and relieve material supply pressure at pump. Remove metering valve from the metering unit. 2. Remove the gun control cable from the actuator. 3. See Figure 7-4. Remove pressure transducer cover (1), and disconnect the cordset plug (2) from the pressure transducer (3) Nordson Corporation

48 7-6 Repair Replacing the Actuator Body (contd.) 4. Remove the two M5 x 16 cap screws (4) and remove the spring cover (5). 5. Locate the four cordset wires (6) that are connected to the terminal block (7). Note wire color and relative position in the terminal block (7). Loosen the set screws that secure these wires in the block, remove these wires, and tighten the set screws. 6. Remove the M5 x 16 cap screw (8), tube clamp (9) and cordset (10). 7. Loosen the two upper M3 x 8 coupling cap screws (11). 8. Support the trimset valve (13). Remove the two M5 x 20 cap screws (12), trimset valve (13), and coupling (14) from the actuator body (15). 9. Unpack the new actuator body (15) and make sure the spring and guide (16) are in position on the top of the body. 10. Install the coupling (14) (with stem still attached) on the shaft (17) so that the stem is fully seated against the shaft. 11. Remove the two loosened M3 x 8 cap screws (11) from the coupling and place a small drop of threadlock adhesive on the threads of each screw. Install the cap screws (11) in the coupling (14) and tighten to 10 lb-in. (1.13 N m). 12. Position the trimset (13) against the new actuator body (15). Install the two M5 x 20 cap screws (12) and tighten to 75 lb-in. (8.47 N m). 13. Loosely install the cordset (10), tube clamp (9), and cap screw (8) to the side of the actuator body (15). 14. One at a time, place each cordset wire (6) in its proper slot of the terminal block (7) and loosen the set screw. Make sure all wires are fully inserted in their proper slots before you tighten the set screws. (Refer to Figure 7-5 for the wiring diagram, if necessary.) 15. Position the spring cover (5) on the top of the actuator body (15) and loosely install the two M5 x 16 cap screws (4). 16. Install the cordset plug (2) on the pressure transducer (3) and install the pressure transducer cover (1). Tighten the two M5 x 16 cap screws (18) to 75 lb-in. (8.47 N m).

49 Repair 7-7 Replacing the Actuator Body (contd.) 17. Adjust the cordset (10) and tighten the cap screws (4) and tube clamp cap screw (8) to 75 lb-in. (8.47 N m). 18. Remove the manifold (19), O-rings (20), and cap screws (21) from the side of the old actuator body (15). Install these items on the new actuator body and tighten to 75 lb-in. (8.47 N m). 19. Install the metering valve assembly on the metering unit as described at the end of this section.

50 7-8 Repair Replacing the Actuator Body (contd.) A Figure 7-4 Installing new actuator body 1. Pressure transducer cover 2. Cordset plug 3. Pressure transducer 4. Cap screws 5. Spring cover 6. Cordset wires 7. Terminal block 8. Cap screw 9. Tube clamp 10. Cordset 11. Coupling cap screws 12. Cap screws 13. Trimset valve 14. Coupling 15. Actuator body 16. Spring and guide 17. Shaft 18. Cap screws 19. Manifold 20. O-rings 21. Cap screws

51 Repair 7-9 Replacing the Actuator Body (contd.) RED BLUE GRAY BLACK GREEN WHITE Terminal Block RED BLUE GRAY BLACK GREEN WHITE Servo Actuator Pressure Transducer Coil A Figure 7-5 Terminal block wiring diagram 4. Installing Metering Valve on Metering Unit 1. Apply a thin coating of grease to two new O-rings. Place the O-rings in the O-ring grooves of the trimset valve. 2. Install the metering valve assembly on the metering unit. Secure the metering valve assembly with the four #10-32 x 2.5 cap screws. 3. Connect the gun control cable to the servo actuator. 4. Connect the 1 / 4 -in. air supply tube to the air manifold fitting. 5. Turn on power to the system and check for hose and fitting leaks. 6. Purge the gun to remove trapped air from the metering unit, metering valve, hoses, and gun. (If necessary, contact Nordson Corporation for the proper purge procedure for your application.) 7. While purging the gun, check for leaks around the stem.

52 7-10 Repair

53 Section 8 Parts

54 8-0 Parts

55 Parts 8-1 Section 8 Parts 1. Introduction This section contains an illustrated parts list for the Two Component System Metering Valve. Use of the Illustrated Parts List The number in the Item column indicates the number assigned to the part in the illustration preceding the list. The code NS (Not Shown) is used for parts that are not included in the illustration. A dash ( ) is used when the part number applies to all the parts in the illustration. The six digit number in the Part column is the Nordson part number assigned to that part. A series of dashes in this column means that the part cannot be ordered separately; it must be obtained as part of the assembly or subassembly. The Description column gives the Nordson Corporation name of the part, together with its dimensions and other physical properties (where appropriate). The proper description must be used when ordering replacement parts. Indented parts are components of assemblies and/or subassemblies. For example: Item Part Description Quantity Note Top Level Assembly Assembly or Part 2 A Subassembly or Part 1 If you order the top level assembly, items 1 and 2 will be included. If you order item 1, item 2 will be included. If you order item 2, you will receive item 2 only. The number in the Quantity column is the quantity required per unit or assembly. When the quantity is not applicable, a dash will appear in the column. An AR in the column means that the quantity required per installation must be ordered. A letter in the Note column refers to a note below the parts list which gives additional information concerning that part. Special attention must be given to noted parts.

56 8-2 Parts ,4 19, , ,4 23 8, , , A Figure 8-1 Two component system metering valve assembly

57 Parts 8-3 Common Service Parts The following service parts are available for the repair of the metering valve: Item Part Description Quantity Note Cover, spring Screw, socket head cap, M5 x Actuator body assembly 1 D Lubricant, anti-seize, 1 oz Screw, socket head cap, M5 x Coupling assembly, shaft 1 7 Coupling, shaft Screw, socket head cap, M3 x Adhesive, thread lock, VC-3, 30 cc (1.014 fl oz) Screw, socket head cap, M5 x Clamp, tube Cordset, right-hand (RH) pressure transducer Manifold, air Grease,, 1.5 oz tube Transducer, pressure, 2000 psi O-ring, pressure transducer 1 B Cover, pressure transducer O-ring, in. x in. x in Screw, socket head cap, M5 x O-ring, in. x in. x in. 2 B Connector, 1 / 8 NPT x 1 / 4 OD air tube 1 A Muffler, air 1 / 8 NPT 1 A Trimset valve AR Bonnet, lip seal-type 1 C O-ring, Viton, x x B Screw, socket head cap, #10-32 x 2.5 in. 4 NOTE A: Coat the threads of these components with sealant paste (Nordson P/N or equivalent) prior to assembly. B: Coat this item with grease (Nordson P/N or equivalent) C: Coat O-rings of this assembly with grease (Nordson P/N or equivalent) D: Coat stem of this assembly with grease (Nordson P/N or equivalent) prior to assembly. AR: As Required

58 8-4 Parts

59 Section 9 Specifications

60 9-0 Specifications

61 Specifications 9-1 Section 9 Specifications Dimensions: Refer to Section 3, Figure 3-1 Weight: 2 lb 8 oz (1.13 kg) Air Pressure: Operating: 80 to 100 psi (5.52 to 6.90 bar) Maximum Airflow: 0.8 scfm (0.023 m 3 /min) Ambient Air Temperature: 40 to 160 F (4 to 71 C) Fluid Pressure Rating, Static: Maximum of 2000 psi ( bar) Operating Temperature of Material: 78 to 82 F (25.5 to 27.8 C) Material Viscosity Range: 10,000 to 3,000,000 cps Flow Range: 0 to 350 lb/hr (0 to 158 kg/hr)

62 9-2 Specifications