1. Flexible action, reliable function, small impact and vibration, small noise, long service life.
2 The fluid passes the hydraulic valve, the pressure loss is small; when the valve orifice closes, the sealing performance is good, the inside leakage is small, no outside leakage.
3 The control of the parameters (pressure or flow) stability, by external interference with small changes.
4 compact structure, installation, commissioning, use, maintenance convenience, good versatility.