RA-20 Paint/Solvent/Dump Valve

Transcription

1 Instruction Sheet P/N 74B0 RA-0 Paint/Solvent/Dump Valve Description The paint/solvent valve is a normally closed valve used to trigger coating material. The valve may be used alone to actuate paint or solvent within the rotary atomizer, or may be coupled with a dump valve for paint actuation and dump. Figure Paint/Solvent/Dump Valve. Fluid Inlet. Air Inlet Removal Refer to the Repair section in the RA-0 Rotary Atomizer manual for a detailed description of removing the valve from the rotary atomizer. Installation Based on the system they are used with, the paint/solvent/dump valves can be installed in several possible configurations. Single-, dual-, and three-valve installations allow the valves to function in a variety of ways. Figures and show all four possible installations which may be used to actuate paint from within the rotary atomizer. The dual-valve can be installed as a paint/dump (installation B), or a paint/solvent valve configuration (installation C). The three-valve installation (installation D), can be used as a paint/solvent/dump valve configuration. For part numbers of reference items, refer to the parts list at the end of this document.

2 RA-0 Paint/Solvent/Dump Valve Single-Valve Installation See Figure, Installation A. The single-valve installation is where the valve is used as a paint valve. To install a single-valve, perform the following steps:cover the O-ring with O-ring lube.insert valve () into the interface plate.tighten set screw.install pneumatic line to air inlet ().Connect fluid tubing to fluid inlet (). Dual-Valve Installation See Figures and. Installations B and C show two alternate dual-valve installations, a paint/dump valve configuration and a paint/solvent valve configuration. Paint/Dump Installation See Figure. Installation B. The dual-valve installation shown is typical in RA-0 rotary atomizers, where the two valves are used for paint and dump. To install the two valves, perform the following steps:. Loosen the two cap screws (6) in the dual-port manifold (5).. Make sure the v-notch on the manifold is facing down.. Insert the paint valve () into the left-hand port of the manifold. 4. Place the O-ring (8) between the valves. 5. Use the two screws (4) to connect the dump valve (7) to the underside of the paint valve (), as shown. 6. Tighten the screws. 7. Insert the dummy valve plug (9) into the right port of the manifold. 8. Make sure the side of the dump valve fits tightly against the v-notch on the manifold. The curved groove of the manifold should be facing up. 9. Tighten the cap screws (6) on the manifold to secure the valves during operation. 0. Refer to the RA-0 Rotary Atomizer manual for procedures to reinstall the manifold into the rotary atomizer.

3 RA-0 Paint/Solvent/Dump Valve Paint/Solvent Installation See Figure, Installation C. The dual-valve installation shown is typical in RA-0 rotary atomizers where the two valves are used for paint and solvent. To install the two valves, perform the following steps:. Loosen the two cap screws () in the dual-port manifold ().. Make sure the v-notch on the manifold is facing down.. Insert the paint valve () into the left port of the manifold. Make sure the fluid inlet on the valve is facing down. 4. Insert the solvent valve (4) into the right port of the manifold. Make sure the solvent inlet is facing up. 5. Tighten both cap screws on the manifold to secure the valves into the ports. 6. Refer to the RA-0 Rotary Atomizer manual for procedures to reinstall the manifold into the rotary atomizer. Three-Valve Installation See Figure, Installation D. The three-valve installation is used when a paint/solvent/dump configuration is desired. To install the three valves, perform the following steps:. Loosen the two cap screws () on the dual-port manifold ().. Make sure the v-notch on the manifold is facing down. The curved groove on the manifold should face up.. Insert the paint valve () into the port on the left-hand side of the manifold. Make sure the fluid inlet is facing down. 4. Place the O-ring (7) between the two valves. Use the two screws (5) to attach the dump valve (6) to the underside of the paint valve () as shown. 5. Tighten the two screws (5). 6. Make sure that the side of the dump valve (6) fits tightly against the v-notch on the manifold. The curved groove of the manifold should face up. 7. Insert the solvent valve (4) into the right port on the manifold with the solvent inlet facing up. 8. Tighten the two cap screws on the manifold to secure the valves during operation. 9. Refer to the RA-0 Rotary Atomizer manual for procedures to reinstall the manifold into the rotary atomizer.

4 4 RA-0 Paint/Solvent/Dump Valve Rotary Atomizer Installations Diagram A. Single Valve B. Valve (RA-0, typical) Figure Rotary Atomizer Installations A and B. Air inlet 4. Screws. Paint valve 5. Dual-port manifold. Fluid inlet 6. Cap screws 7. Dump valve 8. O-ring 9. Dummy valve plug

5 RA-0 Paint/Solvent/Dump Valve C. Valve (RA-0) D. Valve (RA-0) Figure Rotary Atomizer Installations C and D. Paint valve 4. Solvent valve. Dual-port manifold 5. Screws. Cap screws 6. Dump valve 7. O-ring

6 6 RA-0 Paint/Solvent/Dump Valve Operation Single-Valve Dual-Valve The following information describes how paint/solvent/dump valves operate in single-, dual-, and three-valve installations. All valve installations require a minimum air pressure of.75 bar (40 psi). When air pressure is applied at the air inlet, the valve opens to dispense coating material. Because of its spring-return closure, the valve closes when air is removed. See Figures 4 and 5. These figures show a dual-valve installation as it dispenses coating material or solvent. See Figure 4. In this figure, coating material or solvent from a low pressure feed system enters at the fluid inlet (). Since the lower valve is closed, the coating material is dead-ended. When air is applied at the air inlet (), the valve opens and coating material or solvent flow through the fluid outlet () to the rotary atomizer cup. Figure 4 Dual-Valve Operation. Fluid Inlet. Fluid Outlet. Air Inlet See Figure 5. If air is removed from the air inlet port of the upper valve, the upper valve closes and blocks the coating material or solvent. When new coating material or solvent flows through the fluid inlet (), the material passes into the second valve. When air is applied to the air inlet port of the second valve (), the lower valve opens and dumps material from the dump port () into a waste container.

7 RA-0 Paint/Solvent/Dump Valve 7 Figure 5 Dual Valve Operation. Fluid Inlet. Dump Port. Air Inlet Port of Secondary Valve Three-Valve Three-valve installations are typically used in applications that require the use of paint, solvent, and dump valves, such as quick color-change applications. Each one of the three valves functions as a paint, solvent, or dump valve. One valve is used as a paint valve to trigger paint. The second valve is used as a solvent valve for cup flush. The third valve is used as a dump valve for color-changing.

8 8 RA-0 Paint/Solvent/Dump Valve Repair See Figure 6. If a visual inspection shows fluid in the weep hole or the valve does not close, disassemble and rebuild as necessary. Disassembly To disassemble the valve, follow the procedures below.. When possible, flush the valve with a compatible cleaning solution before removing the valve from the system.. Turn off both fluid and air pressure to the valve.. Remove the screws (), lock washers (), and air cylinder () from the valve body (, 4). 4. Remove and discard the O-ring () from the valve body (, 4). 5. Using the Nordson wrenches provided, remove the lock nut (5) from the piston lock nut assembly (6). 6. Remove the screws () that attach the valve seat (, ) to the valve body (, 4). a. remove retaining ring (7) b. push out seat (8) from bottom at valve seat (, ) c. discard O-ring (6) 7. Remove the retaining ring (7). 8. Remove the packing cartridge (9) with ball tip (0) attached by pushing at the seat end. NOTE: The cartridge seat is reversible. If the valve has been leaking, reinstall the cartridge seat with the end that had been seated opposite the ball tip. 9. Check the ball tip (0) for wear or scoring. Replace if necessary. 0. Check the packing cartridge (9) and discard its O-ring (). Replace the packing cartridge, if necessary.

9 RA-0 Paint/Solvent/Dump Valve 9 Assembly To reassemble the valve, follow these procedures.. Coat the packing cartridge (9) and new O-rings () with a small amount of non-detergent grease.. Install the O-rings into the valve body (, 4).. Install the packing cartridge (9) into the valve body. 4. Insert retaining ring (8). 5. Install the valve seat (, ) by tightening the screws () evenly to compress the packing cartridge spring (4). 6. Insert the lock nut (5) and new O-ring (6) into the piston locknut assembly (6). 7. Screw the piston locknut assembly into the packing cartridge clockwise until it comes to rest against the valve body. Turn the piston locknut assembly counterclockwise - / turns. 8. Hold the piston locknut assembly (6) and lock it in place with the locknut (5) and thread locking compound. 9. Install the air cylinder (), lock washers (), and screws () into the valve body. 0. Install the air inlet elbow to the port of the valve, as shown.

10 0 RA-0 Paint/Solvent/Dump Valve Parts Paint/Solvent/Dump Valve Item Part Part Description Quantity Note 04 VALVE, paint, solvent 05 VALVE, dump SCREW, fillister, 0- x.000 in., nylon WASHER, lock, E, spt, #0, stl, nickel CYLINDER, air, valve SPRING, comp,.000 x 0.70 OD x 0.08 in NUT, lock, #0-, upper A, B PISTON, locknut, assembly B O-RING, Viton, 0.08 ID x w, br B NS DISC, piston B NS SEAL, piston B NS NUT, seal lock B NS RETAINER, piston B RETAINING RING, internal, 56, basic C CARTRIDGE, packing BALL TIP C O-RING, hotpnt, 0.56 x x 0.06 in. C O-RING, hotpnt,.5 x.50 x 0.06 in. C BODY, valve, paint, solvent BODY, valve, dump ELBOW, male, / 4 in. tube x / 8 in. npt, ny O-RING, hotpnt, x 0.8 x 0.06 in. C RETAINING RING, internal, 45, basic C SEAT, cartridge C O-RING, PTFE, 0.50 x 0.75 x in O-RING, hotpnt, 0. x 0.48 x 0.06 in SEAT, valve, male O-ring seal SEAT, valve, male, tubing SCREW, skt, #0- x 0.50 in., nylon O-RING, Viton, 0.56 x x in. C NS COMPOUND, thread lock, vc- AR NS LUBRICANT, O-ring, Parker, 4 oz AR NOTE A: This part is also included in Air Piston Kit, part 06. B: Refer to Air Piston Kit. C: These parts are included in RA-0 Valve Repair Kit, part 959.

11 RA-0 Paint/Solvent/Dump Valve Figure 6 Paint/solvent/dump Valve, Exploded View

12 RA-0 Paint/Solvent/Dump Valve RA-0 Solvent Valve Kit Part Description Quantity KIT, RA-0, solvent valve 04 VALVE, RA-0, paint/solvent 989 SCREW, skt, / 4-0 x 0.75 in., zinc 958 MANIFOLD, valve mounting PLUG, pipe, sq, / 8, Delrin 94 O-RING, Viton, 0.56 x x in. 970 ELBOW, male, / 4 tube x / 4 NPT TUBING, polyurethane, / 4 OD, clr 4 RA-0 Dump Valve Kit Part Description Quantity KIT, RA-0, dump valve 05 VALVE, RA-0, dump 989 SCREW, skt, / 4-0 x 0.75 in., zinc 958 MANIFOLD, valve mounting PLUG, pipe, sq, / 8, Delrin 94 O-RING, Viton, 0.56 x x in TUBING, polyurethane, / 4 OD, clr O-RING, PTFE, 0.65 x x 0.06 in SCREW, skt, 0- x.000 in., zinc 955 PLUG, valve dummy RA-0 Dump Solvent Valves Kit Part Description Quantity 9540 KIT, RA-0, dump/solvent valves 04 VALVE, RA-0, paint/solvent 989 SCREW, skt, / 4-0 x 0.75 in., zinc 958 MANIFOLD, valve mounting PLUG, pipe, sq, / 8, Delrin 94 O-RING, Viton, 0.56 x x in. 970 ELBOW, male, / 4 tube x / 4 NPT TUBING, polyurethane, / 4 OD, clr O-RING, PTFE, 0.65 x x 0.06 in SCREW, skt, 0- x.000 in., zinc 9557 VALVE, RA-0, dump

13 RA-0 Paint/Solvent/Dump Valve RA-0 Valve Repair Kit Part Description Quantity 959 REPAIR kit, RA-0 valve O-RING, hotpnt, 0.56 x x 0.06 in O-RING, hotpnt, x 0.8 x 0.06 in BALL TIP O-RING, hotpnt,.5 x.50 x 0.06 in SEAT, cartridge 9864 RETAINING RING, int, 45, basic 9860 RETAINING RING, int, 56, basic 94 O-RING, Viton, 0.56 x x in. Air Piston Kit Item Part Description Quantity Note 6 06 PISTON, lockout, assembly NUT, lock, #0-, upper O-RING, Viton, 0.08 ID x w, br NS DISC, piston NS SEAL, piston NS NUT, seal lock NS RETAINER, piston NS: Not Shown Issued 9/07 Original copyright date 999. Nordson and the Nordson logo are registered trademarks of Nordson Corporation. Delrin and Viton are registered trademarks of E.I. DuPont de Nemours & Co.

14 4 RA-0 Paint/Solvent/Dump Valve