原文：
一种调整回液压力方便、调定压力恒定， 又不易发生堵塞的微型聚氨酯混合装置中的微量回液节流阀，它包括阀体、阀芯、阀座、调节锁定装置，其阀芯与阀座设置为倒锥配合结构，即阀芯顶端部为锥体大头，该倒锥体与阀座上锥形喇叭口锥角相对，阀座上锥形喇叭口朝阀体内空腔即出料腔侧，阀芯端部倒锥体大端位于阀体内进液口内，阀芯上倒锥体与喇叭底孔相对位置形成同轴圆环状节流口，由于阀芯锥体母线与阀座锥体母线夹角为两锥角之和，这样具有一定粘度的料液在通过环形节流口之后，压力降稳定，通流迅速、顺畅， 彻底解决了堵塞问题；液流产生的自定心作用，不但使节流口前后压差恒定、调整也异常方便。

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译文：
Back to the fluid pressure to facilitate an adjustment, it is set constant pressure, but also difficult to clogging of micro-polyurethane mixture liquid unit trace back the throttle, which includes the valve, valve, valve seat, adjust lock device, the spool and inverted cone with the seat set the structure of the Department of pyramidal bulk spool to the top of the inverted cone and cone-shaped bell seat on the relative angle, seat on the conical bell towards the valve body cavity that is the material cavity side of the inverted cone large end end spool valve body into the liquid in the mouth, the valve on the inverted cone and the relative position of bottom speaker coaxial annular orifice formed, due to bus and seat valve cone cone angle for the bus and the two cone angle, such material has a viscosity of liquid through an annular orifice, the pressure drop and stability, flow quickly, smoothly and completely solved the congestion problem; flow generated from the set cardiac effects, not only around the throttle pressure constant, but very easy to adjust.