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Precisely Metering Inlet and Outlet Pressure

This proportional pneumatic control valve provided precise turbocharger wastegate control with reduced hysteresis and turbo lag.


Customer Problem

An automotive system manufacturer was trying to resolve an issue they were having with achieving more precise control over the position of a turbocharger wastegate. Their current solution was a single valve to control both inlet and outlet pressure, which did not offer enough precision and produced too much hysteresis and turbo lag. The new solution needed to be airtight and small enough to fit in a confined space.

The TLX Solution

TLX worked with the customer to develop a two-valve solution using pneumatic valves with proportional control. One valve proportionally metered the inlet pressure, and one valve metered the outlet pressure. Two valves were chosen because a single multiport valve that provided both inlet and outlet pressure would result in some leakage and less precise control. The valve was small and airtight, provided precise proportional control over the wastegate position, and reduced hysteresis and turbo lag.

Proportional Pneumatic Control Valve

Proportional Pneumatic Control Valve

Supply voltage
24 Vdc nominal
Coil resistance at 20°C
131 Ω
Operating temperate range
-40°C to 65°C (-40°F to 150°F)
Operating pressure range
-3 to 124 kPa
Flow rate
24 l/min @ 80 kPa
Leak rate
< 1 cc/min
Response time
< 3 ms
PWM pressure control
10-90% duty cycle
PWM vacuum control
10-90% duty cycle

All TLX components are customized to fit system requirements, meaning technical specifications are unique to each customer and design. Examples given on our website are for illustration purposes only.

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