The flow control and pressure control valve has three functions: it can regulate the flow, the second is to adjust the pressure, and the third is to shut off the medium. The valve integrating the three functions replaces the spool valve and butterfly valve, saving construction costs and installation space.
It is mainly used in hydroelectric power plants, power plants, water diversion projects and other pipe network systems where the medium is water, and it plays a role in regulating the flow rate and the condition of the pipeline medium and regulates the Pressure of the pipe network.
The peculiarity of the flow control and pressure control valve
lies in its constructive design and choice of materials, so it is not afraid of clogging of the sewage slideway and is not afraid of pollution. Not easy to jam. The drives are significantly smaller.
The Ventil can automatically adjust the preset parameter value of the pipeline medium to keep it constant within a certain accuracy, and the accuracy range can also be adjusted.
The valve has good cavitation resistance. The ribs on the inner wall of the valve also work as a rectifier plate, which can disperse the water flow and prevent cavitation.
At the same time, valve noise and piston vibration are also reduced. The valve control system can use an integrated electronic circuit, which is small, reliable, highly sensitive, and easy to install and debug. The fully closed leakage is zero and can be used as a shut-off valve.
It is not necessary to set up additional shut-off valves. If the requirements for the degree of control and accuracy are not very high, the control of the valve mbe done annually or normally electrically. It can be installed horizontally or vertically.
This series of upgraded flow control valves is not only suitable for clear water, but also has good tolerance for natural rivers and lakes and light sewage.
Due to the design structure and material selection, the problems that the flow control valve is easily scaled, blocked and the driving device is too large have been solved for many years.
It is a new type of multi-function valve, applicable to municipal water supply, industrial water supply, mine water, power plant and water diversion engineering and other pipe network systems. It replaces shut-off valve, pressure control valve and flow control valve (one valve replaces multiple valves), playing the role of flow regulation, energy dissipation and evacuation, decompression and pressure regulationetc., and has excellent regulation for high pressure and large pressure difference conditions, and control function with the characteristics of energy dissipation, noise reduction, vibration reduction and anti-cavitation. It can effectively improve the safety and reliability of the system and meet the needs of the system automatic control.
Working principle and structure
Piston-type structure, the adjustment mechanism of the piston-type control valve should be a crank-spool mechanism, and the spool of the closing part should be a cylinder or cone-piston . In the cylinder inside the valve body, it can be guided by guide rails to move axially along the center of the pipeline, thereby changing the area of the flow channel to realize the functions of flow control and pressure reduction.
The form of connection with the pipeline is a flange connection, and the flange joint size and structure length meet the requirements of the relevant GB.
The electric flow control and pressure control valve consists of valve body, piston, crank, connecting rod, energy dissipation device, valve stem, bushing, valve seat, sealing ring, etc. The main parts are assembled.
The valve body of the electric flow control and pressure control valve is a streamlined axisymmetric flow channel, and the liquid in the valve body can be guided well without turbulence, which can greatly reduce the noise and vibration of the valve.
Ensure that the valve has good anti-cavitation properties under high pressure difference and its allowable cavitation coefficient should not be greater than 0.4.
The electric flow control and pressure control valve has excellent linear control performance, so the control system overrides the valveIt can regulate the outlet pressure transmitter feedback signal to keep the outlet water pressure constant.
The electric flow and pressure control valve has reliable sealing performance, and when the control valve is fully closed, there is guaranteed no leakage.
Under normal operating conditions, the electric flow control and pressure control valve does not show any blockages and harmful vibration phenomena, thus ensuring safe and reliable operation of the system. The service life is at least 30 years.
Piston control valves have good resistance to clogging. It is suitable for liquids with sediment and small particle contamination.
The piston control valve can ensure the safety and reliability of the whole anti-thrust and no harmful vibration under the working conditions of working pressure difference and dynamic opening and closingensure water is eaten.
The driving method of electric flow control and pressure control valve is motor driven. The motor drive device should have good waterproof performance, flexible, safe and reliable, and the manual operating torque should meet the national standard.
The electric device of the spool control valve includes a motor, a reduction worm gear, a mechanical limit value adjustment mechanism, a torque control mechanism, a lift control mechanism, an opening indication mechanism, and a manual electric conversion device.
The electric device of the spool control valve adopts the design of electromechanical integration and is equipped with a control box for local operation.