User manual EFD 752V MAINTENANCE GUIDE

[. . . ] 752V Series Diaphragm Valve MAINTENANCE & PARTS GUIDE Electronic pdf files of EFD® manuals are also available at www. efd-inc. com/manuals. html. IMPORTANT!Save this Sheet. Forward to Maintenance or Tool Crib Supervisors A NORDSON COMPANY For EFD sales and service in over 30 countries, contact EFD or go to www. efd-inc. com/contact EFD, Inc. East Providence, RI USA 800-556-3484; +1-401-434-1680 (outside the USA) info@efd-inc. com www. efd-inc. com EFD International Inc. [. . . ] Remove stroke control knob and spring by turning counter-clockwise. Remove the piston retainer ring and anti-torque washer. Lubricate O-ring, piston shaft and air cylinder wall with Nye Lubricant #865. Reinstall components in reverse order of disassembly. Tools required: 7/64" hex wrench 1/8" flat-tip screwdriver 6" adjustable wrench 6" needle-nose pliers snap-ring pliers Replacement Parts for Specific Valve Models Model 752V & 752V-UH & 752V-UHSS 752V-DVD UHMW* n/a 752V-SS 7521F 7521DVD-UH Fluid Body Acetal Stainless 7521E n/a n/a 7521E-SS 7521E-SS 7521DVD-SS Fluid Inlet Fitting 7543BP (1/4" OD Tube) 7543BP (1/4" OD Tube) 7543BP (1/4" OD Tube) Tip Adapter 7536BP 7536NP 7536BP Diaphragm 7510 7510 7510-DVD * Ultra High Molecular Weight optional 3 Anti-torque washer #7533 10 Stroke control knob #750SR-KIT (stroke reference, aluminum) #750SSR-KIT (stroke reference, stainless steel) Tamper-resist stroke control 752V-DVD (stainless steel) #7545SS 13 12 16 Piston retainer ring #7526 Piston spring #7525 Stroke control knob O-ring #7517 www. efd-inc. com info@efd-inc. com USA 800-556-3484 Europe +44 (0) 1582 666334 Asia +86 (21) 5854 2345 Sales and service of EFD dispensing systems are available worldwide. Troubleshooting Guide No fluid flow · If valve operating air pressure is too low, the valve will not open. Increase air pressure to 70 psi (4. 8 bar) minimum. The reservoir air pressure may not be high enough. · Fluid leaks out between fluid body and diaphragm · Fluid leakage between the fluid body and diaphragm indicates the annular sealing ridge on the fluid body is damaged or the fluid body is distorted due to excessive torque on the retaining screws. In either case, replace the fluid body. · · · · Fluid flows out of the drain hole Fluid flowing out of the drain hole indicates a ruptured diaphragm. Replace in accordance with the maintenance instructions. Fluid drools after the valve closes, eventually stopping · This is caused when air is trapped in the outlet section of the fluid chamber or the fluid has entrapped air. The air will expand after the valve closes, causing extrusion until the air reaches atmospheric pressure. Purge the valve by dispensing at a steady flow until clear. If a small tip is used, it may be necessary to remove the tip while purging to obtain sufficient flow to carry the air down through the tip adapter. · If the fluid has entrapped air, the material must be degassed before dispensing. Valve responds slowly when opening and closing · Valve response is related to control air hose length and size. The valve is supplied with 5-feet of 3/32" ID tubing attached. [. . . ] Check the stroke adjustment knob to be sure it is less than two turns out. A steady drip also indicates failure of the diaphragm to close fully due to particle build-up or wear. In either case, replace the sealing head in accordance with the maintenance instructions. · · A NORDSON COMPANY · USA: 800-556-3484 or +1-401-434-1680 Europe: 0800 585733 or +44 (0) 1582 666334 Asia: +86 (21) 5854 2345 technical@efd-inc. com www. efd-inc. com ©2006 Nordson Corporation 752V-MAINT-01 v062606 [. . . ]