User manual EFD 740V

[. . . ] The 740V valves are used with VALVEMATETM controllers for precise, repeatable outputs from a fraction of a microliter up to continuous stripes of low to high viscosity fluids. It is an ideal valve for use on automatic assembly machines. Each valve comes equipped with a 5-ft actuating air hose and male quick-connect, adjustable stroke control and fluid inlet fitting. The dispensing tip adapter features a SafetyLokTM collar for secure dispensing tip attachment. [. . . ] For low viscosity fluids, start with a pressure of approximately 5 psi (0. 3 bar). For higher viscosity, use 20 to 40 psi (1. 4 to 2. 8 bar). Note: If solvents or other watery fluids are to be dispensed in very small amounts, specify 0 to 15 psi (0 to 1. 0 bar) precision regulator to control reservoir pressure. Set the valve control air pressure to 70 psi (4. 8 bar). Open the valve with an air pulse long enough to fill the valve and start fluid flow. Then test the dispensed amount with a nominal time setting. Increase or decrease reservoir pressure, needle stroke and valve open time to arrive at the desired deposit size. Set stroke adjustment two full turns out. Rotate fluid chamber to desired position. Figure 1 Note: Do not rotate fluid chamber more than one complete turn. 7 / Setup Instructions 740V Exploded View Items included in repair kit #740V-RK are underlined and listed in blue. Needle stroke control #780SR-KIT (aluminum) #780SSR-KIT (stainless steel) 5 0 20 Piston return spring #7802 Thrust washer #7809 Snap ring #7526 O-ring (Buna) #7519 Piston and needle assembly #7805-SS Air input hose #78518A Air cylinder body #7811-SS (stainless steel) #7811 (aluminum) Retaining washer #7807 O-ring (Buna) #7806 Packing spring #7808 Needle packing assembly #7810 Fluid inlet fitting #7543BP (installed) for 1/4" OD tubing #7610BP (supplied) for 3/8" OD tubing O-ring (Buna) #7517 Fluid chamber #7402-SS (stainless steel) #7402 (aluminum) O-ring (Viton) #5148RV SafetyLok collar #7403 Tip adapter/seat assembly #7401 Nye gel lubricant, 1 gram foil packet (not shown) #H-147-P 8 / Exploded View Maintenance Tools 6" adjustable wrench snap ring pliers packing extraction tool #7803 Maintenance and Cleaning Normal cleaning is accomplished by purging with appropriate solvent. The tip adapter/seat assembly can be removed (after the reservoir pressure has been bled off) for cleaning without demounting the valve. CAUTION: Always relieve the reservoir pressure and disconnect the power before performing any maintenance on the system. On all EFD tank reservoirs, there is a pressure relief valve that should be activated before opening the reservoir to ensure that all pressure is bled off. On all EFD cartridge reservoirs, the unique threaded design provides fail-safe air pressure release during cap removal. Packing extraction tool #7803 Fluid chamber To thoroughly clean valve chamber and replace needle packings: 1. Remove the needle stroke control and piston return spring to prevent damage to the needle and seat during reassembly. Remove the inlet fitting and tip adapter/seat assembly from the fluid chamber. Remove the fluid chamber from the cylinder body by turning counterclockwise until free. Then remove the O-ring from the fluid chamber. Remove the needle packings from the fluid chamber, using tool #7803 supplied with the valve. Insert through outlet end of the fluid chamber and gently push out the packings (see Figure 1). Do not use sharp instruments to scrape or clean these components. Remove any remaining packings and the packing spring from the needle. Continued on Next Page O-ring Needle packing assembly 2. 3. Figure 1 Pushing the needle packings from the fluid chamber. 4. 9 / Maintenance and Cleaning Note: The lower cylinder needle O-ring is held in place by a flat retaining washer that also serves as the packing spring seat. The washer may come out with the spring. [. . . ] EFD will repair or replace free of charge any part of the equipment thus found to be defective, on authorized return of the part prepaid to our factory during the warranty period. The only exceptions are those parts which normally wear and must be replaced routinely, such as but not limited to valve needle packings and needle assemblies. In no event shall any liability or obligation of EFD arising from this warranty exceed the purchase price of the equipment. This warranty is valid only when oilfree, clean, dry, filtered air is used. [. . . ]