Large area double-guide from the bushing and the seat completely counteracts the torsion damages to components caused by the lateral force, resulting in stable and reliable operation.

Good sealing performance and reliability. Porous cylinder core structure makes the throttling surface separated from the sealing face, preventing the wash by high velocity flow.

Porous structure operates with the bushing, preventing flash distillations or cavitations and reducing noises. This results in stable control process.

The use of high performance composite sealing ring results in good sealing performance.