Details

Application of electric flow regulating and pressure regulating valve:

The valve is mainly used in water plant, power plant, water diversion project and other medium water pipe network system, and plays the role of regulating medium flow, flow pattern and pipe network pressure.

Characteristics of electric flow regulating and pressure regulating valve

1. The advantage of the valve over the traditional flow control valve lies in its structure design and material selection, which makes it not afraid of sewage blocking the slide way, scaling phenomenon and jamming. The driving device is obviously reduced.

2. The valve can automatically adjust the preset pipe medium parameter value to keep it constant within a certain accuracy, and the accuracy range can also be adjusted.

3. The valve has good cavitation resistance. The rib plate on the inner wall of the valve body has the function of rectifying 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 control system of the valve can be integrated electronic circuit, small size, good reliability, high sensitivity, easy installation and debugging.

5. It can be used as a stop valve. There is no need to set other stop valves.

6. If the control degree and accuracy requirements are not very high, the control of the valve can be in the form of manual or ordinary electric.

Product introduction:

The electric piston type multi-function control valve is of piston type structure, the regulating mechanism of the piston type control valve shall be crank slider mechanism, and the slider of the closing piece shall be cylinder or cone-shaped piston. The guide rail can guide the cylinder in the valve body to move axially along the center of the pipeline, so as to change the area of the flow passage, so as to realize the function of regulating the flow and reducing the pressure. The connection form with the pipeline is flange connection, and the flange connection size and structure length meet the requirements of corresponding GB.

The piston type control valve is composed of valve body, piston, crank, connecting rod, energy dissipation device, valve rod, shaft sleeve, valve seat, sealing ring and other main parts.

The valve body of piston type control valve is a streamline axisymmetric flow passage, and the fluid can be guided without turbulence in the valve body, which can significantly reduce the noise and vibration of the valve. Ensure that the valve also has good cavitation resistance under high pressure difference, and its allowable cavitation coefficient shall not be greater than 0.4.

The piston type control valve has excellent linear regulation performance, so that the control system can adjust and control the valve through the feedback signal of the outlet pressure transmitter to keep the outlet pressure constant.

The piston type control valve has reliable sealing performance. When the control valve is fully closed, no leakage is guaranteed.

The piston type control valve is free of jamming and harmful vibration under normal operation conditions, so as to ensure the safe and reliable operation of the equipment. The service life shall not be less than 30 years. The piston type control valve has good anti blocking ability. It can be applied to the fluid with sediment and small particle impurities. Under the condition of large working pressure difference and dynamic water opening and closing, the piston type control valve can ensure the whole thrust resistance safe and reliable without harmful vibration.

The driving mode of piston type control valve is motor driven. The motor driving device shall have good waterproof performance, flexible action, safety and reliability, and the manual operation torque shall meet the national standard. The electric device of piston control valve includes motor, reduction worm gear, mechanical limit adjustment mechanism, torque control mechanism, stroke control mechanism, opening indicator mechanism and manual electric conversion device. The electric device of the piston type control valve adopts the mechatronics design,

Configure local operation control box.

The driving device of piston type control valve has the following performance:

·Valve overload protection;

·Valve travel protection;

·Manual / electric switching device;

·Valve opening position indicator;

·The opening and closing contacts of the valve and the outgoing of the contact wiring shall meet the requirements of the local and remote control room.

1. Good linearity: due to the special structure design inside the valve body, it has a good linearity for the flow control characteristics of the fluid, even in the first 10% stroke, it still has a good flow control effect.

2. Anti cavitation and anti vibration: make full use of the principle of fluid dynamics to design the flow passage, eliminate the damage of cavitation and vibration to the pipe network, and greatly improve the service life of valves and pipes.

3. Reliable operation: reasonable design of flow channel and sealing type enables the valve to be suitable for the fluid containing small particle impurities such as sediment, without leakage or control failure due to improper closing caused by impurities.

4. High pressure energy dissipation: even in the case of high pressure difference, the valve can effectively eliminate high pressure energy, reduce high pressure to low pressure, and will not produce vibration and cavitation, effectively ensuring the service life of the valve.

5. Excellent material selection: the key parts of the valve, such as valve seat, block, guide rail and other parts are made of special non reinforced material, which is wear-resistant and cavitation resistant, and the hardness is three times that of ordinary non reinforced material.

6. Floating valve seat: the connection between the valve seat and the cone is made of special silica gel, with high viscosity and shear resistance. When the floating valve seat is sealed, it will produce self centering effect, making the seal more reliable.

7. Small fluid resistance: the advanced structure design of the valve, reasonable flow distribution, so that the pressure loss of the entire valve to reduce the impact of the whole network is conducive to saving power consumption.

8. Small operating torque: the opening and closing parts in the valve are cased, the movement direction is the same as the main flow direction, and the effective force area is small, so the operating torque required for opening and closing the valve is also small, and the cost of the driving device can be greatly reduced.

9. Long service life: the main seal of the valve is metal pair, reliable seal, strong fluid erosion resistance, not easy to be damaged by the inclusion of garbage. In addition, most parts are made of stainless steel, so the service life of the valve is greatly improved.