Back Pressure Regulating Valve for Free Extrusion

These valves offer a wide range of pressure options to match specific extrusion requirements, from ultra-low 0–3 inches of water up to 0–5 psi. Intermediate configurations include 0–5", 0–10", 0–15", and 0–30" water column, as well as a 0–3 psi option, giving manufacturers the flexibility to dial in the exact pressure needed for their process.

Accuracy is ±0.1% of full scale for pressures below 60 inches of water and ±0.3% for higher pressure ranges. Repeatability is ±0.2% for low-pressure ranges and ±0.3% for 3–5 psi units. This level of precision ensures consistent tubing diameter and wall thickness across long production runs.

Response time depends on the model series. The MicroAir IV series delivers high-speed response of less than 0.1 second—typically around 20 milliseconds—for 50% full-scale changes, making it ideal for bump and taper tubing applications. Standard MicroAir I and II models respond in approximately 2 minutes from zero to full scale, suitable for steady-state diameter control.

Yes. Multi-channel models are available in 2-, 3-, and 4-channel configurations specifically designed for multi-lumen tubing applications. Each channel independently controls the air pressure for a separate lumen, with its own display and pressure range configuration, enabling precise simultaneous control across all lumens in a single unit.

Multiple control modes are supported depending on the model. Options include 0–10 volt analog input for PLC or other device integration, Air Up/Air Down contact closure inputs from diameter gauges or external controllers, and manual 30-turn precision adjustment knobs. Some models support all three operational modes, providing maximum flexibility for both automated and manual extrusion lines.

MicroAir systems are built for long-term reliability, with a proven lifespan of 10 to 20+ years and minimal maintenance requirements. Every product is backed by a 3-year warranty on parts and labor, and all customers receive unlimited phone support from the engineering team, ensuring low total cost of ownership and minimal downtime.

Back pressure regulating valves are available in single-channel, dual-channel, 3-channel, and 4-channel configurations. Single-channel units are suited for standard single-lumen tubing extrusion, while dual, 3-channel, and 4-channel models are designed for multi-lumen tubing where each lumen requires independent pressure control. The right choice depends on the number of lumens in your tubing and whether you need simultaneous independent pressure management for each.