Graco Inc.

Graco Fluid Automation 633 

Air-powered, proportional control for two-component liquid silicone rubber (LSR)

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The double-acting plungers of Model 633, driven by a common cylinder, ensure that material is delivered consistently at a 1:1 ratio. Its larger shot size capacity and ability to feed material to multiple locations make Model 633 an excellent solution for high-productivity medical, consumable and electronics manufacturing environments.


Programmable feed pressure makes it possible to utilize a common tandem feed station for one or more locations. Use the third stream option simultaneously feed different mixes.


A reduced number of components and fewer valves than most designs lowers the cost of cleaning and maintenance.

Consistent refills, less waste

The pneumatic proportional air-driven cylinders keep material refilling at a consistent rate.


With ratio tied to the A and B transducers, and an audible and visible refill alarm, the possibility of drawing a vacuum and wasting material is very low.

Time-saving operation

A quick refill time of only three seconds at 3000 psi pump pressure keeps manufacturing running at a quick pace.

Wider variability in mold sizes

With a maximum shot size of 150 cc, Model 633 is capable of handling a wide range of manufacturing jobs.

Hoses, mixer and manifold are standard.


Technical Specifications

Feed stations 657, 657-4 and 659
Ratio 1:1, fixed
Shot size Up to 150 cc (75 cc per cylinder)
Feed pressure 3000 psi maximum
Additives Third stream option
Controls PLC