How to achieve flow and pressure regulation function of piston type electric flow and pressure regulating valve in use

The piston type electric flow and pressure regulating valve is guided by a guide vane. The water flows in from outside the guide vane, passes through the jet holes on the guide vane to form multiple streams of water, and collides in the cavity of the valve body to achieve the effect of energy dissipation; Throttling occurs between the edge of the piston and the orifice of the guide vane. Due to the high water flow velocity inside the orifice, the material used for the guide vane is highly wear-resistant and corrosion-resistant; At the same time, due to the collision occurring in the valve body flow channel, the impact of cavitation and erosion on the valve body is effectively reduced, and the service life of the valve is improved. The main sealing ring is located at the front end of the guide vane, and the piston is guided throughout the full stroke. When pushed through the main sealing ring to the fully closed position, the differential pressure before and after the valve forces the main sealing ring to tightly adhere to the outer wall of the sleeve to achieve truncation. The piston moves forward and backward in the guide vane through the guidance of the connecting rod, and the valve stem is driven by the crank and connecting rod. When the actuator drives the valve stem to rotate clockwise, the piston moves backward and opens the valve; When the actuator drives the valve stem to rotate counterclockwise, the piston moves forward and closes the valve.

characteristic

1. The advantage of this valve over traditional flow control valves lies in its structural design and material selection, which makes it not afraid of sewage blocking the slide, scaling, and easy to get stuck. The driving device has significantly decreased.

2. This valve can automatically adjust the pre-set pipeline medium parameter values to maintain a constant accuracy within a certain range, and the accuracy range can also be adjusted.

3. This valve has good resistance to cavitation, and the rib plate on the inner wall of the valve body also serves as a rectifier plate, which can disperse water flow and prevent cavitation. At the same time, it also reduces the noise of the valve and the vibration of the piston.

4. The fully closed leakage is zero and can be used as a shut-off valve. No need to install other shut-off valves.

5. The control degree and accuracy requirements are not very high, and the control of this valve can be done manually or in ordinary electric form.

6. The installation method can be horizontal or vertical.

7. The water flow cross-section at any position inside the valve body is a circular structure.

working principle

Piston type structure, the regulating mechanism of the piston type control valve should be a crank slider mechanism, and the closing slider should be a cylindrical or conical piston. It can move axially along the pipeline guided by guide rails inside the cylinder of the valve body, thus changing the flow area to achieve flow regulation and pressure reduction functions. The connection form with the pipeline is flange connection, and the flange connection size and structural length meet the requirements of the corresponding GB.

The electric flow and pressure regulating valve is composed of main components such as valve body, piston, crank, connecting rod, energy dissipation device, valve stem, shaft sleeve, valve seat, sealing ring, etc.

The valve body of the electric flow and pressure regulating valve is a streamlined axisymmetric flow channel, and the fluid can be well guided without turbulence in the valve body, which can reduce the noise and vibration of the valve. Ensure that the valve also has good anti cavitation characteristics under high pressure difference, and its allowable cavitation coefficient should not exceed 0.4.

Electric flow and pressure regulating valves have excellent linear regulation performance, which enables the control system to regulate the valve through the feedback signal of the outlet pressure transmitter and maintain a constant outlet pressure.

Electric flow and pressure regulating valves have reliable sealing performance, ensuring no leakage when the regulating valve is fully closed.

The electric flow and pressure regulating valve operates normally without any jamming or harmful vibration, ensuring the safe and reliable operation of the equipment. The service life shall not be less than 30 years. Piston control valves have good anti blocking ability. Suitable for fluids with sediment and small particle impurities. The piston type control valve ensures overall thrust resistance safety and reliability under high working pressure difference and dynamic water opening and closing operating conditions, without harmful vibration.

The driving mode of the electric current and pressure regulating valve is motor-driven. The motor drive device should have good waterproof performance, flexible and safe operation, and manual operation torque should meet national standards. The electric device of the piston control valve includes a motor, a reduction worm gear, a mechanical limit adjustment mechanism, a torque control mechanism, a stroke control mechanism, an opening indication mechanism, and a manual electric conversion device. The electromechanical design of the electric device for the piston control valve is equipped with a local operation control box.