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Graco MD2 [2/30] Contents
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MD2 Valve Models
2 312185T
Contents
MD2 Valve Models ..........................2
Warnings .................................3
Component Identification ....................5
Features ..................................6
Installation ................................7
Setup .....................................8
Operation ................................10
Maintenance ..............................11
Troubleshooting ...........................12
Repair ...................................13
Parts ....................................16
Accessories ..............................23
Technical Data ............................29
Dimensions ...............................29
Graco Standard Warranty ...................30
Graco Information .........................30
MD2 Valve Models
Model Selection
The following table provides a summary of the MD2 dispense valves that are described in this manual.
MD2 Valves
Part No.
Maximum Working Pressure
psi (MPa, bar) Description
255179
3000 psi (20.7 MPa, 207 bar
1:1 Soft seat, adjustable snuff-back
255180 1:1 Hard seat, non-adjustable snuff-back
255181 Wide ratio, soft seat, adjustable snuff-back
255182 Wide ratio, hard seat, non-adjustable snuff-back
255183 2000 psi (13.8 MPa, 138 bar) Cold spray/joint fill valve
MD2 Valve Handles
255206 120 psig (0.84 MPa, 8.4 bar) Air trigger
255208 3A @ 28 VDC Electric air actuated
255249 0.5 @ 28 VDC Electric actuated lever
Type Description
Hand held valves with
inter nal air trigger
The internal air trigger controls the air piston that operates the MD2 valve. A pilot port
can be used to control a pump motor.
Hand held valve with
electric switch
The switch signals the customer’s controller to open and close the ports on the MD2
valve using a remote 4-way air control valve which is not included.
Wide ratio valves The wide ratio MD2 valve has a center injection tip. This feature is helpful with wider
ratio applications, specifically when the low volume material is a much lower viscosity
than the high volume material. Frequent cleaning intervals may be required to maintain
the tip.
Hard seats Carbide seats and hardened needles are good for abrasive materials and stall against
pressure applications.
Soft seats UHMWPE seals are good for precise snuff-back control.
Содержание
- For use with disposable mixers to dispense a variety of sealants and adhesives for professional use only 1
- Instructions parts 1
- Md2 valve 1
- Contents 2
- Md2 valve models 2
- Model selection 2
- Warning 3
- Warnings 3
- Warning 4
- Component identification 5
- Features 6
- Grounding 7
- How to use the valve trigger safety 7
- Installation 7
- 16 straight thread o ring boss fluid inlets 8
- 8 npt f air inlets 8
- Balancing the system 8
- Fluid and air connections 8
- Inlet check valves 8
- Selecting hoses 8
- Mixer selection 9
- Setting the amount of snuff back 9
- System start up 9
- Lever actuated valve and electric switch hand held valve 10
- Machine mount valve 10
- Operation 10
- Pneumatic hand held valve 10
- Pressure relief procedure 10
- Ratio checking 10
- Daily shutdown 11
- Maintenance 11
- Preventive maintenance 11
- Troubleshooting 12
- Disassembly 13
- Repair 13
- Electric switch handle if equipped 14
- Pneumatic handle if equipped 14
- Air cylinder section 15
- Electric switch handle if equipped 15
- Fluid section 15
- Pneumatic handle if equipped 15
- Reassembly 15
- And 255181 16
- Md2 valve 17
- 255182 and 255183 18
- Md2 valve 19
- Electric switch handle 255208 20
- Pneumatic handle 255206 21
- Actuated lever 255249 22
- Accessories 23
- Catalyst injectors 23
- Inlet check valves 3000 psi working pressure 23
- Plastic tube fittings to connect air signals 23
- Mixers and shroud 24
- Nose piece accessories 24
- Plastic tubing for air signal lines 24
- Orifice kits 25
- E505 orifice block kit 26
- Conversion kits 27
- Valve accessories 27
- Angled adapter kits 28
- Front valve repair kits 28
- G 1 2 outlet kit 28
- W045 25 angle 24w046 15 angle 24w047 5 angle 28
- Dimensions 29
- Technical data 29
- For patent information see www graco com patents 30
- For the latest information about graco products visit www graco com 30
- Graco headquarters minneapolis international offices belgium china japan korea 30
- Graco inc and subsidiaries p o box 1441 minneapolis mn 55440 1441 usa copyright 2001 graco inc all graco manufacturing locations are registered to iso 9001 www graco com revision t march 2016 30
- Graco information 30
- Graco standard warranty 30
- To place an order contact your graco distributor or call to identify the nearest distributor phone 612 623 6921 or toll free 1 800 328 0211 fax 612 378 3505 30
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