The Y‑type tubular check‑throttle valve is a dedicated flow control component for railway brake air circuits.
It follows TB/T 2897‑2018 general technical specification for railway pneumatic valves.

Constructed with high‑strength alloy body, this in‑line throttle valve is installed directly inside pneumatic pipelines.
Adjustable screw with lock nut allows precise setting of throttling opening to control charging and exhausting speed.

It features one‑way function: airflow is throttled in forward direction for shock suppression, while reverse airflow passes through with full opening without restriction.
This design effectively prevents pressure surge and accidental brake action.

NBR nitrile rubber seals provide excellent low‑temperature performance.
The valve satisfies GB/T 21563 anti‑vibration standard, and operates steadily within ‑40℃ ~ +60℃ for locomotives, passenger and freight wagons.

Y‑type Tubular Check‑Throttle Valve For Railway