SEALANTS & ADHESIVES - CH Reed Inc.

4
200
GRACO SEALANTS AND ADHESIVES EQUIPMENT ❚ 2K EQUIPMENT
Variable Ratio Hydra-Cat
Mechanical Proportioner
FIGURE A
VARIABLE RATIO HYDRA-CAT IN
MINIMUM RATIO POSITION
• Air motor is connected directly to primary fluid pump
• Each full stroke of air motor creates full stroke in
primary fluid pump
• Air motor is also connected to secondary fluid pump by
lever arm, which is supported at fulcrum like a teetertotter.
• In the Min-Set position, the stroke of the primary fluid
pump (1) is equal to the stroke of the secondary fluid
pump (2).
Figure A
1 = Primary Stroke 4 in. (102 mm)
2 = Secondary Stroke in
Minimum Ratio Position
Air
Motor
1 2
Primary
Fluid Pump
Fulcrum
Motor
Lever Arm
Secondary
Fluid Pump
If setting is at Min-Set:
• Mix ratio will be at a minimum
• Pressure ratio will be at a minimum
• Flow Rate will be at a maximum
FIGURE B
VARIABLE RATIO HYDRA-CAT IN
MAXIMUM RATIO POSITION
• Secondary fluid pump was moved closer to the fulcrum
• In the Max-Set position, air motor and primary fluid
pump still make full stroke (1), but secondary fluid pump
now makes shorter stroke (3) which is less than 25% of
original stroke length.
• By moving the secondary fluid pump closer to or farther
from the fulcrum, any ratio in the basic range can be
obtained.
Air
Motor
1
Primary
Fluid Pump
Fulcrum
Motor
Lever Arm
Secondary
Fluid Pump
If setting is at Max-Set:
• Mix ratio will be at a maximum
• Pressure ratio will be at a maximum
• Flow Rate will be at a minimum
Figure B
1 = Primary Stroke
4 in. (102 mm)
3 = Secondary Stroke
in Maximum
Ratio Position