The PMC PH-2 dual-acting piston displacement pump line eliminates pressure drops by moving material to the manifold on both strokes. Unlike traditional single-acting pumps that only move fluid in one direction, this system uses alternating ball checks to deliver seamless flow. By locking in continuous pressure during both the fill and discharge strokes, the PH-2 (and PHX-2) ensure the smooth, on-ratio performance that spray foam and polyurea contractors need to maximize job site uptime.
Why Dual-Acting Performance Matters
Traditional pumps only pressurize material during half of their cycle. This structural gap creates a brief hesitation in flow, resulting in fluctuating pressure at the spray gun.
The Polyurethane Machinery Corporation’s (PMC’s) PH-2 pump line solves this issue. As a dual-acting displacement system, it provides continuous mechanical power whether the piston is moving forward or backward.
- Zero Hesitation: Constant material delivery to the fluid manifold.
- Consistent Pressure: Prevents pressure drops that cause off-ratio foam.
- Smoother Spray Patterns: Enhances the mix for a better yield and cleaner finish.
The Core Engineering: Alternating Ball Checks
The secret behind the PH-2’s continuous pressure lies in its internal valve design. The pump line features a smart system of alternating ball checks located in both the piston head and the inlet body.
As shown in our breakdown images, these components work in perfect harmony:
1. The Fill Stroke
- The piston retracts to draw new chemical into the inlet body.
- The inlet ball check opens to allow fresh material into flood inlet body.
- Simultaneously, the piston head ball check seats.
- This seals off backflow, and sends the pump body fluid to the manifold.
2. The Discharge Stroke
- The piston reverses direction to push the inlet body fluid toward the manifold.
- The inlet ball check instantly seats, preventing material from escaping back into the supply drum.
- The internal piston head ball check opens to allow passage for newly pressurized inlet body material to move to the manifold.
This continuous internal handoff takes a reciprocating mechanical movement and converts it into a steady, uninterrupted flow of ISO and Resin, sending both materials to the manifold on both strokes.
PMC PH-2 Technical Specifications
The engineering behind the dual-acting pump translates directly into reliable, high-tier field performance. The following factory specs detail what the system delivers under real-world operating conditions:
| Specification | Rating / Measurement |
| Max Working Pressure | 2,000 psi (138 bar) |
| Max Output | 28 lbs/min (12.70 kg/min) |
| Max Hose Length | Up to 410 ft (121.9 m) with 120V Transformer |
| Max Fluid Temperature | 190°F (87.7°C) |
| Heater Wattage Options | 7,500W / 9,000W / 10,500W / 14,000W Total |
| Weight | 415 lbs (188 kg) |
| Standard Features | Pressure Balance Control (PBC), Inlet Monitoring Kit, Count Down Shutoff |
Built for the Demands of Professional Contractors
When you are spraying residential insulation or high-pressure coatings, your profit is directly tied to machine reliability. The PH-2 proportioner is engineered strictly for high-yield productivity. By stabilizing fluid transition points internally, it delivers uncompromising performance with minimal overall maintenance.
Watch the full video demo above to see the internal animation of the PH-2 pump line in action!
Ready to Add the PH-2 to Your Rig?
Don’t let pressure drops and off-ratio errors eat into your project margins. Take control of your spray pattern with hydraulic reliability built right here in the USA.
This is an affordable and durable proportioner, often considered a workhorse in the industry. It offers the contractor a high-value return on investment. Learn more about the PH-2 by downloading the brochure here.
If you think the PH-2 is right for you, take the next step. Contact your local authorized PMC distributor today to get a quote, check inventory, and learn more about the PMC PH-2 series proportioner.