Fuel Cell Pressure Regulator

Key performance characteristics for fuel cell pressure control

The Equilibar® precision back pressure regulator (BPR) is the perfect fit for pressure control in fuel cell testing systems. In particular, fuel cell test stands benefit from

• The high sensitivity of the Equilibar BPR in the low to mid pressure ranges that is lacking in most competitive products.
• The unmatched 1000:1 flow turn-down ratio and control range of the Equilibar BPR
• The capacity of the Equilibar BPR to control multiphase fluids with extreme precision due to its unique multi orifice design.
• The dome-loaded control of the Equilibar BPR allowing it to pair with an electronic controller for superior automation.

Low Flow Control
Incredible 1000:1 Flow Rate Turn-down Ratio

Equilibar’s “GR” trim was specifically designed in response to the demanding flow rate requirements of the fuel cell testing industry. These GR trim regulators can provide stable stack pressures through ultra wide flow rate ranges required for rigorous test protocols. Gas flow rate control is possible down to below 1 ml/minute.

Equilibar BPRs control pressure on the outlet of the anode and cathode

Ease of Computer Automation

The Equilibar BPR operates using a pilot regulator on its dome to provide a setpoint. The dome loaded design is sensitive to changes in an Electro-Pneumatic Regulator (EPR) setpoint as small as 0.001 psig, giving a process computer unprecedented control of gas system pressures. While most fuel cell testing systems use closed-loop PID feedback on the stack outlet pressure sensor, the incredible precision of the Equilibar BPR allows for full system control using an EPR with open-loop control or simply using a manual pressure regulator as a pilot setpoint regulator.

Ability to Control Multi-phase Fluids

The unique multi-orifice design of Equilibar BPR allows for stable pressure control across a wide Cv range and can easily handle mixed phase (liquid-gas) flow or varying pressures on the outlet of the BPR. Multi-phase flow in fuel cell testing systems occurs when gas and condensation are mixed. Traditional valves and back pressure regulators may have a single annular valve seat, often very small. Slugs of liquid and gas mixture in the small throat of these valves may cause a disruption in the stability of the upstream process pressure. The Equilibar BPR with it multiple orifices handles the liquid/gas mixture smoothly.

Contact an Application Engineer to help select the perfect back pressure regulator for your fuel cell application.

Customer Case Study – Improving catalysts for automotive fuel cells

Researchers at Charles University in Prague, Czech Republic, have successfully used an Equilibar® Back Pressure Regulator combined with a QPV electronic pressure regulator to provide precise control of fuel cell anode and cathode pressure across a wide range of test conditions. The research is part of vital international efforts to develop improved environmental catalysts for automotive fuel cells. At Charles University, fuel cell research is working to develop improved catalysts with the goal of lowering noble metal content, which would directly lower the cost of the power supply while also using more environmentally friendly materials. Read a detailed account in the link to the right.

How Equilibar Back Pressure Regulator Works