英國STAR伺服閥的饋線桿是由比一般鉆石更堅固的藍寶石制作，使用中不會磨損或破裂，從而預防了無效變速和漂移，其終端口也有藍寶石制作，防止閥的進口磨損和污染，從而大大延長了閥的使用壽命，提升了閥的穩定性和可靠性。STAR閥、STAR伺服閥、STAR液壓閥
STAR伺服(fu)(fu)(fu)閥(fa)主要用(yong)在(zai)電氣液(ye)(ye)壓(ya)伺服(fu)(fu)(fu)系統中作為(wei)執(zhi)行(xing)(xing)元件(jian)(見液(ye)(ye)壓(ya)伺服(fu)(fu)(fu)系統)。在(zai)伺服(fu)(fu)(fu)系統中，液(ye)(ye)壓(ya)執(zhi)行(xing)(xing)機構同電氣中，液(ye)(ye)壓(ya)執(zhi)行(xing)(xing)機構同電氣及氣動執(zhi)行(xing)(xing)機構相比，具有快速性好、單位(wei)重量輸出功率大、傳(chuan)動平穩，抗干(gan)擾能力(li)強等特(te)點。

STAR Hydraulics has released a new range of electro-hydraulic servo valves, including miniature units to suit underwater robots. They are available from Hylec Controls .
The industrial servo valves with integral electronics offer monitoring of spool position and improved static and dynamic characteristics. These features make them suited to industrial applications such as screw down systems.
Another recent addition is the new range of high-flow, mechanical feedback servo valves. They feature a high power pilot stage, providing performance previously available only with smaller flow valves. These two stage valves offer lower noise and threshold than conventional three stage servo valves. This makes them ideal for fatigue test rigs.