The B Side, in general, is less likely to cause contamination in the screens. As a result, B Side screens are often neglected.
One possible cause of B Side pressure loss is the collection of paint chips over time. Spray foam drums are recyclable and during the recycling process, some of the drums are repainted inside. Over time, the B component can soften the paint in the drum, causing it to flake off and collect in the Y-filter assembly – restricting flow to the machine. Making the Y-filter assembly a priority to clean can help prevent the collection of paint chips.
The Pump Lube Check Valve is often overlooked when performing maintenance. The check valve can be maintenanced by releasing one pound of air into the valve to ensure it is in working condition.
The equipment used today for spraying plural component urethane foam and coatings provide the means to preheat the A and R chemicals, pressurize the chemical to the manufacturer’s recommended PSI and deliver that conditioned and heated chemical to the gun via a heated hose. Most units today utilize a system which provides automatic hose heat. The proportioners are equipped with a controller which receives a signal from a temperature sensing unit. The signal indicates the temperature of the chemical in the hose from a remote distance from the proportioner and ideally just before the gun.
Generally, when you check equipment for moisture buildup – you’re bleeding your pressure system and tanks. However, over time, moisture sometimes builds up in your spray foam hose air line. Periodic maintenance of the air line is required.
