can the receivers be used as transmiters? I only need transmitters.

No, the receivers are marked with R and transmitters with T. You could experiment and see. If you don't want to experiment, assume they are not the same and you must use R for receiver and T for a transmitter.

Do these do their own tone generation/demodulation? Or are they effectively high-frequency speakers/mics and an external circuit does the processing?

They are effectively a high frequency speaker/mic

Can you use this to measure flow rate in a pressurized water pipe? How about gas?

Most likely for water. For gas, it would depend on the gas density, and the sensitivity of your circuit. I was able to get some pretty precise nodes in my setup for other things, so provided you know the math needed to calibrate the system, it should get job done. Are you trying to measure the speed using flight time or doppler?

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🔍 Unleash the Power of Sound Detection!

COMPLETE SET - Includes 10 transmitters and 10 receivers for comprehensive ultrasonic solutions.
COMPACT DESIGN - Lightweight at just 18g, perfect for versatile applications without bulk.
HIGH SENSITIVITY - Receive signals with a sensitivity of ≥-75dB, ensuring no detail is missed.
POWERFUL EMISSION - Emit sound pressure levels of ≥110dB for superior range and clarity.
PRECISION PERFORMANCE - Experience ultra-reliable detection with a nominal frequency of 40KHz.

The HiLetgo 20pcs TCT40-16R/T Ultrasonic Sensor Set includes 10 transmitters and 10 receivers, designed for high-performance ultrasonic applications. With a nominal frequency of 40KHz, it boasts an emission sound pressure of ≥110dB and a receiver sensitivity of ≥-75dB, all packed in a compact and lightweight design.