PVA MR2 User manual

MR2
Owner’s Manual
Revision B
WHERE
PRECISION
DRIVES
PRODUCTION

MR2 Manual
Revision B /June 2021
Page 2 of 34
This document is based on information available at the time of its publication. While efforts
have been made to ensure the contents of this manual are accurate, the information
contained herein does not purport to cover all specific details or variations in hardware, or
to provide for every possible contingency in connection with installation, operation, or
maintenance. Features may be described herein which are not present in all hardware and
software systems. Precision Valve and Automation, Inc. assumes no obligation of notice to
holders of this document with respect to changes subsequently made.
Precision Valve and 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 of
Precision Valve and Automation, Inc. and is 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 and Automation, Inc.
Copyright © 2019
Precision Valve and Automation, Inc.
All Rights Reserved.

MR2 Manual
Revision B /June 2021
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Table of Contents
Introduction..................................................................................................................................4
PVA Contact Information.........................................................................................................................................4
Document History .....................................................................................................................................................4
Safety...........................................................................................................................................................................5
Theory of Operation .................................................................................................................................................. 7
Personal Protective Equipment ............................................................................................................................. 7
Waste Disposal ........................................................................................................................................................... 7
Necessary Tools......................................................................................................................................................... 7
Spare Parts Kit ........................................................................................................................................................... 7
Setup .............................................................................................................................................8
Overview......................................................................................................................................................................8
Operation.......................................................................................................................................9
Bleed the Pump .........................................................................................................................................................9
Shutdown....................................................................................................................................................................9
Disassembly................................................................................................................................................................9
Assembly Instructions............................................................................................................................................ 15
Bottom Fluid Section .................................................................................................................................... 15
Metering Piston Assembly ...........................................................................................................................18
Metering Sleeve ............................................................................................................................................. 19
Fill the Fluid Distribution Block .................................................................................................................. 25
Install the MR2............................................................................................................................................... 26
Maintenance ...............................................................................................................................27
Spare Parts .................................................................................................................................27
Technical Specifications .......................................................................................................... 28
Troubleshooting ........................................................................................................................ 28
Damaged Valve Gasket ......................................................................................................................................... 29
Worn O-Ring ............................................................................................................................................................ 30
Calling Technical Support..................................................................................................................................... 30
Notes............................................................................................................................................ 31
Warranty..................................................................................................................................... 32
Table of Figures ......................................................................................................................... 33

MR2 Manual
Revision B /June 2021
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Introduction
Before you operate this system, read the operation and setup manual. This will help you to
become familiar with the product and ensure successful operation.
If any questions or problems arise, contact PVA’s Technical Support department.
PVA Contact Information
Main Office PVA
One Mustang Drive
Cohoes, NY 12047
Tel [phone]
Fax [phone]
Website: http://www.pva.net
Email: [email protected]
Technical Support
Tel [phone]
Email: [email protected]t
Document History
Revision
Revision Date
Reason for Changes
REV B
June 2021
Spare Parts Kit
REV A
January 2020
Initial Release
Note: All photographs and CAD model representations in this document are a “general
representation” of the system and its components. The actual appearance of the
system and its components can differ based upon customer specific configuration.

MR2 Manual
Revision B /June 2021
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Safety
Certain warning symbols are affixed to the machine and correspond to notations in this
manual. Before operating the system, identify these warning labels and read the notices
described below. Not all labels may be used on any specific system.
Always wear approved safety glasses when you operate or work near the
workcell.
Before you operate the system, read and understand the manuals provided
with the unit.
Never put hands or tools in areas with this symbol when the machine is in
operation. A dangerous condition may exist.
Read and understand the manuals provided with the unit before any repairs
or maintenance is done. Only a qualified individual should do service.
Use caution when there are pressurized vessels. Find and repair any leaks
immediately. Always wear appropriate safety equipment when you work
with pressurized vessels or vessels that contain chemicals
Shear hazard from moving parts. Avoid contact.
Do not remove protective guarding.
In situations where inattention could cause either personal injury or damage
to equipment, a warning notice is used.

MR2 Manual
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Do not smoke near the PVA UV cure machine. Always have a fire
extinguisher available for emergency use.
Before performing any repairs or maintenance to the system, turn off power
and lock out the power disconnect switch.
Warning notices are used to emphasize that hazardous voltages, current,
temperatures, or other conditions that could cause personal injury exist in
this equipment or may be associated with its use. Only qualified personnel
should enter areas designated with this symbol.
Laser light source present. Do not stare directly into the beam. Do not use in
the presence of highly reflective surfaces
Pinch hazard from moving parts. Avoid contact.
Hot surface. Avoid contact.
Warning, Ultraviolet (UV) light hazard. Do not look directly at the UV light
source.

MR2 Manual
Revision B /June 2021
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Theory of Operation
The MR2 has a dual piston system and can process 2K materials with mix ratios up to 15:1.
For 1K chemistries, the MR2 alternates metering chambers to reduce refill time and increase
throughput. Each metering chamber is controlled independently so the mix ratio and flow
rate can be changed at the application point.
Personal Protective Equipment
Operators must use eye protection because material contents are under pressure. Always
wear gloves when handling materials and solvents. Refer to MSDS sheets on the material
being dispensed for other precautions.
Waste Disposal
Dispose of all used parts and materials in accordance with local laws and regulations.
Necessary Tools
PVA offers tools and cleaning accessories to maintain the MR2.
Part Number
Description
02506
Hook and Pick Set
Soft-jaw Pliers and/or Vice
Lubrication Fluid
Silicone Grease
2.5mm and 3mm T-handle or Hex Key
90° Snap Ring Pliers
Figure 1: MR2 Tool Kit
Spare Parts Kit
Part Number
Description
612-12675-1
Soft Seals (Does not include diaphragm)
614-12157-1
Diaphragm
Figure 2: Spare Parts Kit

MR2 Manual
Revision B /June 2021
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Setup
Before you operate the MR2 Metered Piston Dispenser, read and understand this manual.
This information is for safety and correct operation of the valve. This manual provides the
information needed to operate, repair, and troubleshoot.
Overview
The MR2 Metered Piston Dispenser is constructed from three main components.
•The upper section of the valve is called the metering body; it houses the carbide
cylinders and pistons.
•On the front of the metering body is the oil window and fluid distribution block which
are used to ensure the pistons function smoothly.
•The lower section of the valve is called the metering sleeve which is covered by the
air body that controls the flow of dispensed material.
Figure 3: MR2 Overview

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Operation
Note: Use only compatible solvents and materials or the seals and O-rings will be
damaged.
Bleed the Pump
1. To bleed the MR2, dispense all the way until the rods reach their full travel.
2. Repeat this five times to get all air out of the system.
Shutdown
Refer to the workcell manual for information on how to shut down the workcell.
1. Move the valve over a purge cup and reduce the pressure in the system to zero.
2. Bleed the pressure out of the valve and install the nightcap. Make sure to wipe off any
excess material before screwing on nightcap. If there are two materials, do not mix
them or they will cure.
Disassembly
1. Before you remove the MR2 from the material supply system, purge the material or
manually empty and do not refill. Make sure the pistons are all the way down.
2. Engage the workcell Emergency Stop button.
3. Turn the material and air pressure to 0 psi.
4. Remove the MR2 from the material supply and dispense systems.
5. Use a 2.5 mm hex key to remove the eight M4x12 button head screws in the oil
window.
Figure 4: Remove Oil Window Screws

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6. Remove any lubrication fluid in the fluid distribution block.
7. Examine the oil window gasket for any signs of wear or damage. Replace the gasket
if there are signs of wear.
8. Use a 3 mm hex key to remove the six M4x16 bolts on the front of the air body.
Figure 5: Remove the Air Body Bolts
9. Remove the air body.
10. If necessary, remove the valve stop.
Figure 6: Remove the Valve Stop
11. Remove the inlet and outlet pistons from the air body.
Figure 7: Remove and Clean the Pistons
12. Clean the air body and the pistons.
13. Examine the piston O-rings for wear. If they are worn, replace them.