Piston type regulating valve is mainly composed of body, seat, piston, shaft, crank, connecting rod, driving pin, taper pin, bearing and operating mechanism and other parts. The piston regulating valve converts the rotation of the shaft into the axial movement of the piston along the guide rail through the crank connecting rod. During the forward and backward movement of the piston, the flow regulation and pressure control are realized by changing the flow area between the piston and the valve seat. Water flow enters the body from the axial arc. The passageway in the piston type regulating valve is axisymmetric. The flow will not produce turbulence. Regardless of the position of the piston, the flow section in the valve chamber at any position is annular and shrinks to the shaft center at the outlet, so as to achieve the best cavitation prevention and avoid possible cavitation damage to body and pipe due to throttling. 

1.Linear regulation: The valve opening and linear floe can achieve precise regulation. 

2.Lower maintenance cost. Long service life: Selection of reasonable flow passage and proper material can ensure long service life of the valve. 

3.Small driving force: Hydraulic balance design and the overlaid copper alloy for guidance can ensure more stable and reliable piston operation.  

4.Optional installation: Valves may be installed vertically, horizontally and suspended or at either side of the pipeline. 

5.Reliable sealing (common type): The special design structure of the elastomer valve makes the less possibility of jamming of the valve by the debris. The valve is equipped with a hand hole cover and a backwashing device to facilitate regular maintenance and repair.  The high-performance elastomeric silicone-connected metal seat provides a bubble-level seal and prevents valve seat scratches and prolongs the service life of the seat. 

6.Collision energy dissipation, anti-vibration (multi-hole type): Spiral holes are symmetrically and evenly distributed on the sleeve along the perimeter direction to make water column clashing to dissipate energy. After the collision, the energy completely disappears, effectively preventing the strenuous vibration caused by the energy dissipation under the high pressure difference. 

7.Tapered hole design, cavitation resistance (multi-hole type): Special tapered hole design accelerates the water flow passing through the sleeve and causes cavitation to occur in the center of the valve to effectively prevent damage of valve parts caused by cavitation under high pressure difference. 

8.It can be used for many purposes and can replace hydraulic diaphragm control valve and Y-type control valve function.