Related Manuals for PVA MV250-LL
Summary of Contents for PVA MV250-LL
- Page 1 MV250-LL POSITIVE DISPLACEMENT VALVE Version: 112-5825 Operation Manual Revision: A Date: March 2014...
- Page 2 This document is based on information available at the time of its publication. While efforts have been made to be accurate, the information contained herein does not purport to cover all details or variations in hardware or software, nor to provide for every possible contingency in connection with installation, operation, or maintenance.
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Page 3: Preface
Thank you for purchasing the MV250-LL dispensing valve from PVA. Before attempting to operate the MV250-LL, we recommend that you take a few minutes and read the following operation and setup manual. This will assist in familiarizing you with the product and ensure a successful installation. -
Page 4: Table Of Contents
Table of Contents ............................4 Table of Figures .............................. 4 Theory of Operation ............................5 Air Section ..............................5 Fluid Section ............................... 5 Wetted parts on the MV250-LL include: ....................5 Safety ................................5 Setup ................................5 Tool Kit ................................6 Operation ................................ 7 Air Section .............................. -
Page 5: Theory Of Operation
Quick connect air fittings are typically supplied with the MV250-LL to fit 5/32"od tubing. Note that the valve should be normally in the filled and ready to dispense position. Fluid is supplied to the MV250-LL through the 1/8"npt port located on the stainless steel fluid section of the valve. -
Page 6: Tool Kit
Figure 1: Solenoid Valve Tool Kit PVA offers standard tool kits for all dispensing valves. The tool kit for the MV250-LL is part number B12-1986, which includes all necessary tools and lubricating grease to perform maintenance on this dispense valve. -
Page 7: Operation
Operation Refer to assembly drawings 112-5825_2 for part reference numbers. Air Section • Plumb up the valve as outlined above in the Setup procedure. • Regulate the air pressure operating the valve between 60-100psi. • Making sure that the valve is not aimed toward anyone, cycle the valve several times. Note: When the valve is cycling, the piston should be heard hitting the micrometer adjustment (10), and the needle (1) should be seen going up and down in the center. -
Page 8: Setting Dispense Volume
Refer to the MV250-LL cross sectional view for location of parts referenced in the following procedures. • 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). - Page 9 • ® Use pliers to pull the seat (8) out of the fluid section (7) and remove the 006 Kalrez O-ring (25) from the seat. Note: If stuck, the seat can be pushed through from the opposite side of the fluid section. •...
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Page 10: Assembly Instructions
• All O-rings must be lubricated with a small amount of silicone grease. Note: PVA offers a 2.5cc silicon o-ring lubrication kit; Part#: B62-2048. • A small amount of removable thread locker should be applied to the set screw (16). -
Page 11: Assemble Sections
• Thread the outlet check valve housing (6) onto the bottom of the fluid section (7) and tighten with an adjustable wrench. • ® Place the 007 Kalrez O-ring (27) into the groove of the inlet check valve housing (5). •... -
Page 12: Micrometer Adjustment Breakdown
Micrometer Adjustment Breakdown Figure 3: Micrometer Adjustment Breakdown Reference Section Description Letter Micrometer Wrench Top Screw Dial Micrometer Midsection Collar Micrometer End Figure 4: Micrometer Section Key... -
Page 13: Spare Parts
Spare Parts PVA offers standard spare parts kits for all dispensing valves. These kits are stocked for immediate shipment and allow replacement of all wearable parts of the valve. The spare parts kit for this valve, product number MV25-LL-SP, includes the following components:... -
Page 16: Bill Of Materials For Mv250-Ll
Bill of Materials for MV250-LL: Version: 112-5825 Figure 7: Bill of Materials for Figure 6 Item Part Number Description Quantity V411 Needle Adapter 114-5625 Seat 114-5247 Needle 114-2345 Fluid Section V305 Packing V306 Packing Nut V075 Standoff V200 End Cap... -
Page 17: Troubleshooting
Troubleshooting Problem Possible Cause Corrective Action Valve does not Air pressure to air section too low Increase air pressure to 60-100 psi cycle Packing nut is too tight Loosen packing nut until valve just begins to cycle, retighten Back out micrometer adjustment by turning it Micrometer adjustment is bottomed out counter-clockwise Disassemble and clean valve... -
Page 18: Pva Warranty Policy
The warranty does not extend to components damaged due to misuse, negligence, or installation and operation that are not in accordance with the recommended factory instructions. Unauthorized repair or modification of the enclosed product, and/or the use of spare parts not directly obtained from PVA (or from factory authorized dealers) will void all warranties.
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