Flow regulating valve knowledge introduction

Because of its high regulation precision, cavitation, noise and vibration small, good energy dissipation effect, ideal flow-opening curve, easy to realize automatic control, in many large water transfer projects have been widely used.

Running on electricity, the average daily power consumption is usually around a few degrees. Generally through the sensor on the upper and lower water level (water pressure) monitoring, control system depends on water level or water pressure to control the actuator, and then control the valve opening degree, to accurately control the flow through the valve, the theoretical error will not exceed 5% of the design flow, the actual operation error is generally in 1-2%. Complex calibration of equipment is not required on site. Can accurately maintain a constant flow rate.

The equipment can be controlled on site or by remote control system as required. The clogging control system can automatically identify if the ES-regulating valve is blocked. When the valve is blocked, the control system will step open the ES-control valve to remove the blockage.

The products are widely used in various flow control, water works, sewage treatment plants and drainage pipe management. It is a new flow control equipment of energy saving and environmental protection.

Flow regulating valve application

1. Operation principle

The basic principle of pipeline dispatching operation is "regulating flow, controlling water level and observing pressure". During the operation of water transmission, the opening of each flow regulating valve is adjusted according to the scheduling needs, so that the flow rate of the valve is matched with that of the pumping station, so that the whole system is maintained in a stable state and the water flow state in the pipeline is stable. Set the fluctuation area of the control water level in each regulating pool, and maintain the water level in the fluctuation area by controlling the flow of the regulating valve. The influence of the control water level on the pressure of the upstream and downstream pipelines should be fully considered in the setting of the control water level. At the same time, as the time for the full opening or closing of the regulating valve is about 25min, the adjustment allowance should be reserved for emergency treatment. During operation, it is necessary to observe the changes of pressure values at various pressure observation points in real time, so as to judge whether the water in the pipeline is in a relatively stable operation state.

2. Operation effect

In summary, the main role of regulating valve in energy dissipation, regulating and emergency treatment of three aspects. One is energy dissipation. In the process of operation, the water flow through the regulating valve, at the exit of the collision energy dissipation, water kinetic energy reduced to zero, so that the downstream pipeline water flow more stable, more stable operation. No basins for engineering, such as regulating facilities, high water of the pool will be under the influence of gravity, nearly 70 kilometers along the pipeline, tunnel free flow to star Shi Bo pool before pumping stations, high pool with the stars Shi Bo pumping station forebay nearly 80 m elevation difference, the center line of the pipeline between two pool height fluctuation, section water flow disorder, serious when there will be a "gas" "empty" and so on. The flow regulating and pressure regulating facilities reduce the excess pressure of water in the pipeline, keep the flow state stable, and ensure the stable operation. The second is the effect of flow regulation. The flow regulating valve is easy to operate, with the help of the opening-flow linear change relationship, by adjusting the valve opening can quickly achieve flow regulation, in the case of complete monitoring facilities, can realize automatic control and regulation. The adjustment accuracy of the flow can reach the thousandths, so that the water flow in the pipeline and the pumping station water, operating conditions match. In the process of operation, through monitoring the pressure, water level and flow rate of the pipeline and the regulating pool, the opening of each regulating valve is adjusted in time, so that the water level of each control point is maintained in a relatively stable and reasonable range, and the continuous operation of the full pipe water body is guaranteed. It can realize smooth transition of flow adjustment and water diversion process of pipeline operation and avoid the occurrence of adverse working conditions in flow regulation process. Third, it facilitates timely handling of emergencies. In case of emergency events such as pump station accidents and power outages during operation, each regulating valve shall be successively closed in a short period of time according to the command of the dispatching center, so as to ensure the stability of water level of each regulating pool and the basic constant pressure of pipe section, avoid the occurrence of water hammer and negative pressure damage of pipe, and lay the foundation for restoring the pipeline operation as soon as possible.