Our MVP Metering System
28 May 2024

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 MVP has a variety of pumps in a wide range of configurations.  Most of the pumping systems are based on a “double acting piston pump”.  Double acting piston pumps are a two ball style pump which delivers material on both the up and down stroke.  They are driven by an air motor of which there are a variety of sizes.  There are three basic resin pump sizes;  Gel coat – lower output systems, gel coat application, Chopper / Standard – mid range output, most commonly used for chopper and wet out systems and High Volume – high volume chopper systems and special or automatic equipment.​

Each of these pumps has a corresponding catalyst pump which is attached by a drive linkage.  The catalyst pumps work on the same principles as the resin pump but are driven through a linkage attached to the resin pump.  The catalyst pump and resin pump have a fixed ratio to each other, in that they move together pumping a given amount of resin. This leads us to one of the major principles, since the catalyst pump is attached to and driven by the resin pump, you can never get more of one component just less of the other.  The catalyst pump can not run on its own and pump more catalyst; you can only have a problem with the resin pump and deliver less resin. The same is true for the catalyst.

Note: With the UPS (Ultra Proportioning System) when the resin pump is in the up position the catalyst pump is in the down position, which means when the resin pump is going up the catalyst pump is going down.


UP STROKE: The piston cups seal on the cylinder wall, the piston body ball seals in its seat; everything above the piston body is pushed out.  A vacuum is created below the piston body and new material is drawn in.

1. Piston body ball seals forcing all the materialabove the piston out of the pump.

2. Inlet body ball lifts from its seat and new material is drawn into the pump cylinder.


DOWN STROKE: The down stroke is the displacement stroke, meaning the material in the cylinder is displaced by the piston rod and forced out the pump. The inlet body ball seats sealing the cylinder which force the material up and out the pump. The piston body ball lifts off its seat and allows material to flow through the piston body and out the pump.

1. Piston body ball lifts off its seat allowing material to flow out the pump.

2. Inlet body ball seats sealing off the pump cylinder forcing material thru the piston body and out the pump.