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PVA MV250-LL Operation Manual Download Page 8

8 

 

Setting Dispense Volume 

 

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Once all air is eliminated from the metering chamber, the micrometer adjustment (10) can be used 
to set a specific shot volume to be dispensed each cycle. 

•

 

Turning the micrometer adjustment (10) clockwise will decrease the volume of material in each 
shot, and turning it counter-clockwise will increase the volume of material in each shot.  

Note: If the micrometer adjustment is turned all the way down it will not allow fluid to be dispensed.  

•

 

Once the micrometer adjustment (10) setting is determined, the collar (E) can be turned clockwise 
to lock the setting in place. 

Note: Refer to Troubleshooting section for any problems. 

 

 

Periodic Maintenance 

 

Refer to the MV250-LL cross sectional view for location of parts referenced in the following procedures. 
 

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Lubricate the packing (4) and o-ring (24) on the MV250-LL valve every ~200 hrs by placing a 
few drops of mineral oil or other light oil inside the packing nut (3).  

Note: PVA offers a 2.5cc mineral oil lubrication kit; Part#: B62-0752

. 

•

 

The packing nut (3) may require occasional tightening, as wear occurs in order to prevent leaks 
around the packing. 

 
 

Routine Cleaning and Disassembly 

 

Cleaning and rebuilding the valve will be required from time to time.  
A spare parts kit, part # MV250-LL-SP is available with all the normal wear parts included.   
 

•

 

Begin disassembly by removing air and fluid pressure from the valve. 

•

 

Remove all pneumatic tubing and fluid delivery fittings, hoses, etc. from the valve. 

•

 

Using the tip of a 3/32" Hex key, loosen the packing nut (3). 

•

 

Using the same 3/32" Hex key, evenly remove the two machine screws (15) that thread into the 
fluid body standoffs (7).  

Note: During removal that there is a spring (10) forcing the air section away from the fluid section. 

•

 

Pull the air section (red anodized portion) away from the fluid section (stainless steel portion).   

•

 

Clean off the tip of the stainless steel needle (1). 

•

 

From the fluid section of the valve, unthread and remove the packing nut (3), followed by the 
packing (4) and o-ring (24). 

•

 

Using an adjustable wrench, unthread and remove the luer adapter (22) from the outlet check valve 
housing (6) followed by the washer (18). 

•

 

Using the same adjustable wrench, unthread and remove the outlet check valve housing (6) from 
the fluid section (7). 

Summary of Contents for MV250-LL

Page 1: ...i MV250 LL POSITIVE DISPLACEMENT VALVE Version 112 5825 Operation Manual Revision A Date March 2014 ...

Page 2: ...nges subsequently made Precision Valve Automation Inc makes no representation or warranty expressed implied or statutory with respect to and assumes no responsibility for the accuracy completeness sufficiency or usefulness of the information contained herein No warranties of merchantability or fitness for purpose shall apply This document including the information contained herein is the property ...

Page 3: ...stions or problems arise do not hesitate to contact PVA s Valve Service Department for support This department can be reached at PVA headquarters via telephone or e mail Again thank you for your purchase and we look forward to assisting you in the future as you continue to improve your dispensing processes PVA Contact Information Main Office Technical Support Sales Support PVA Six Corporate Drive ...

Page 4: ...ing and Disassembly 8 Assembly Instructions 10 General 10 Air Section 10 Fluid Section 10 Assemble Sections 11 Setting Micrometer to Zero 11 Micrometer Adjustment Breakdown 12 Spare Parts 13 Bill of Materials for MV250 LL 166 Troubleshooting 177 PVA Warranty Policy 188 Table of Figures Figure 1 Solenoid Valve 6 Figure 2 Tool Kit Contents 6 Figure 3 Micrometer Adjustment Breakdown 12 Figure 4 Micro...

Page 5: ...wo integral check valves to make up the metering chamber The metering chamber fills as the needle retracts away from the seat then dispenses as the needle moves back toward the seat Such fluids may include but are not limited to solvents epoxies UV adhesives silicones RTV grease etc Wetted parts on the MV250 LL include 303 304 stainless steel Teflon Kalrez Safety Due to material contents being und...

Page 6: ... Kit Contents Qty Part Number Description 2 0266244 8 Adjustable Wrench 2 26563 3 32 Hex Key 1 26561 5 64 Hex Key 1 26559 1 16 Allen Key 1 5516A18 Tweezers 1 B62 0752 Mineral Oil Lubrication Kit 2 5cc 1 B62 2048 Silicone Lubricant for O ring 2 5cc 1 9570K71 Hook and Pick Set 1 0266255 Pliers 2 53085A61 Soft Plastic Covers for Pliers 1 PB135 2 Screw Driver for Micrometer 1 PT17184 Micrometer Adjust...

Page 7: ... section 7 and tighten with an adjustable wrench Pressurize the material to be dispensed between 10 20 psi To bleed the fluid section use a 3 32 Hex key to loosen the set screw 17 of the bleed port located on the fluid section 7 being careful not to fully remove the screw Note If fluid does not flow out of the bleed port slowly increase material pressure until fluid and air bubbles are seen or wig...

Page 8: ... may require occasional tightening as wear occurs in order to prevent leaks around the packing Routine Cleaning and Disassembly Cleaning and rebuilding the valve will be required from time to time A spare parts kit part MV250 LL SP is available with all the normal wear parts included Begin disassembly by removing air and fluid pressure from the valve Remove all pneumatic tubing and fluid delivery ...

Page 9: ...e the upper air body 2 from the lower air body 20 to remove the spring 9 then slide the end cap 19 off of the needle 1 Holding the lower air body 20 in one hand grab the needle 1 then push the needle and piston 21 assembly out of the lower air body Remove the 004 Buna O ring 23 from the lower air body 20 Hold the piston 21 with an adjustable wrench then use a 5 64 Hex key to unthread and remove th...

Page 10: ...w 16 using an adjustable wrench and 5 64 Hex key to tighten Mount the other 014 Buna O ring 28 onto the piston 21 Apply a small amount of silicone grease to the inside of the lower air body 20 then drop in the piston and needle assembly Mount the 004 Buna O ring 23 on the end of the needle 1 and slide it down into the groove in the end of the lower air body 20 Slide the end cap 19 onto the needle ...

Page 11: ...ip of a 3 32 Hex key tighten the packing nut 3 Setting Micrometer to Zero When assembling the valve it will be necessary to re calibrate the micrometer adjust back to the zero position Using the wrench A insert the inside tip of the small end into the orifice of the midsection D and rotate it clockwise until the numbered centerline is on a side that can most easily be viewed by the operator Note V...

Page 12: ...justment Breakdown Figure 3 Micrometer Adjustment Breakdown Reference Letter Section Description A Micrometer Wrench B Top Screw C Dial D Micrometer Midsection E Collar F Micrometer End Figure 4 Micrometer Section Key ...

Page 13: ...or this valve product number MV25 LL SP includes the following components Figure 5 Spare Parts Kit Contents Qty Part Number Description 1 114 4750 Needle 1 214 3441 Packing Teflon 1 214 6507 Seat 1 V125 Washer 1 VLV 004B 004 Buna O ring 1 VLV 004K 004 Kalrez O ring 1 VLV 006K 006 Kalrez O ring 1 VLV 007B 007 Buna O ring 1 VLV 007K 007 Kalrez O ring 2 VLV 014B 014 Buna O ring Figure 6 Drawing 112 5...

Page 14: ...s considered confidential and proprietary information It is delivered on the express condition that it not be used disclosed or reproduced in whole or in part for any reason without prior written consent of PRECISION VALVE AUTOMATION Inc DESIGN DATE DRN BY REVISION DESCRIPTION REV RJB 09OCT12 RJB ORIGINAL DESIGN A JA 12 19 14 DER REMOVED SIDE PLUG B C D E F UNLESS OTHERWISE SPECIFIED DIMENSIONS AR...

Page 15: ...302 SS 2 114 6556 UPPER AIR BODY 1 6061 ALUM 3 114 9206 PACKING NUT 1 303 SS 4 214 3441 PACKING 1 VIRGIN PTFE 5 214 6176 CHECK VALVE BODY INLET 1 303 SS 6 214 6177 CHECK VALVE BODY OUTLET 1 303 SS 7 214 6180 FLUID BODY 1 303 SS 8 214 6507 SEAT MV250 1 303 SS 9 01344 SPRING 1 SS 10 01423 MICROMETER HEAD 1 11 01469 SETSCREW 5 40 x 3 16 1 18 8 SS 12 02367 CHECK VALVE 1 SS 13 02368 CHECK VALVE 1 SS 14...

Page 16: ... Lower Air Body 1 10 VLV 014B 014 Buna O ring 2 11 V202 Piston 1 12 114 4595 Upper Air Body 1 13 VLV 007B 007 Buna O ring 2 14 SH5 40x2 0 Socket Head Cap Screw 2 15 SH5 40x2 25 Socket Head Cap Screw 2 16 VLV 006K 006 Kalrez O ring 1 17 VLV 004B 004 Buna O ring 1 18 01344 Spring 1 19 V001 Set Screw 1 20 V300 Luer Adapter 1 21 V125 Washer 1 22 01423 Micrometer Adjustment 1 23 V007 Bleeder Plug 1 24 ...

Page 17: ...sen set screw on fluid body to bleed air Valve leaks from mid section Packing nut is loose Packing is worn Tighten packing nut until snug Replace packing Valve does not dispense anything Air trapped in fluid body needle adapter or dispense needle Valve is not cycling Fluid pressure is too low Material cured in fluid section Micrometer adjustment set too low Flip valve upside down and cycle until a...

Page 18: ...ties extend only to the original purchaser Third party warranty claims will not be honored at any time Prior to returning a product for a warranty claim a return authorization must be obtained from PVA s customer service department Authorization will be issued either via the telephone facsimile or in writing upon your request To qualify as a valid warranty claim the defective product must be retur...

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