英国STAR伺服阀的馈线杆是由比一般钻石更坚固的蓝宝石制作，使用中不会磨损或破裂，从而预防了无效变速和漂移，其终端口也有蓝宝石制作，防止阀的进口磨损和污染，从而大大延长了阀的使用寿命，提升了阀的稳定性和可靠性。STAR阀、STAR伺服阀、STAR液压阀
STAR伺服阀主要用在电气液压伺服系统中作为执行元件(见液压伺服系统)。在伺服系统中，液压执行机构同电气中，液压执行机构同电气及气动执行机构相比，具有快速性好、单位重量输出功率大、传动平稳，抗干扰能力强等特点。

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.