Water treatment valve
The valve is the control part in the fluid conveying system, which has the functions of cutting off, adjusting, diverting, preventing the reverse flow, stabilizing the pressure, diverting or releasing the pressure.
There are many kinds of valves, according to the purpose can be divided into: 1, cut-off valve: mainly used to cut off or connect the media flow.Including gate valve, globe valve, diaphragm valve, plug valve, ball valve, butterfly valve and so on.2, regulating valves: mainly used to regulate the flow of media, pressure, etc.Including regulating valve, throttle valve, reducing valve and so on.3, check valve type: used to prevent the reverse flow of media.Includes check valves of various configurations.4, shunt valves: used for distribution, separation or mixing media.Including various structure of the distribution valve and trap, etc.5. Safety valve: used for overpressure safety protection.Various types of relief valves are included.
Valve body material:
1, non-metallic material valve such as ceramic valve, glass fiber reinforced plastic valve, plastic valve, such as PVC, ASB material valve.
2, metal material valve such as copper alloy valve, aluminum alloy valve, lead alloy valve, titanium alloy valve iron valve, carbon steel valve, low alloy steel valve, high alloy steel valve, cast steel valve.Cast steel and above valves are often used in areas with high frost resistance.3, metal body lining valve such as lead lined valve, lined plastic valve, lined enamel valve, lined tetrafluorin valve.It is commonly used in corrosive sewage works.
Gate valve is used as a cut-off medium, in full open the whole flow through, at this time the medium operating pressure loss is minimal.Gate valves are usually used when the gate is not open or closed frequently and when the gate is kept fully open or fully closed.Not suitable for use as adjustment or throttling.For high-speed flowing media, gate may cause gate vibration when partially opened, which may damage the sealing surface of gate and seat, and throttling may cause gate to be eroded by medium.Gate valve can be used for low temperature pressure can also be used for high temperature and high pressure, but generally not used to transport mud and other media in the pipeline.
check valve is also known as reverse flow valve, reverse check valve, back pressure valve and one-way valve.These valves are automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, belonging to an automatic valve.Check valves are used in piping systems and their primary function is to allow the medium to flow in only one direction and to prevent flow in that direction.Normally the valve operates automatically and the disc opens under the pressure of the fluid flowing in one direction;When the fluid flows in the opposite direction, the pressure of the fluid and the disc self-coincidence disc act on the seat to cut off the flow.Include swing check valve (according to the center of gravity rotation) and lift check valve (along the axis of movement).Check valves are often used in piping to prevent backflow.
Butterfly valve disc installed in the pipe diameter direction.In the butterfly valve body cylindrical channel, disc shaped disc around the axis of rotation, rotation Angle is 0°~90° between, rotation to 90°, the valve is fully open.Butterfly valve structure is simple, small volume, light weight, only a few parts.And only need to rotate 90° to quickly open and close, easy to operate.Butterfly valve in the fully open position, butterfly plate thickness is the only resistance when the medium flow through the valve body, so the resistance generated by the valve is very small, it has a better flow control characteristics, can be used for regulation.One of the most used valves in sewage treatment works.According to the opening mode can be divided into handle butterfly valve and worm wheel butterfly valve.Butterfly valve has two types of elastic seal and metal seal.Resilient sealing valve, sealing ring can be embedded in the body or attached to the disc around.The use of metal sealing valve is generally longer than the elastic sealing valve life, but it is difficult to achieve complete sealing, metal sealing can adapt to higher working temperature, elastic sealing has the disadvantage of temperature limitation.
Ball valves evolved from plug valves.It has the same motion of rotating 90 degrees, except that the body of the cock is a sphere with a circular through hole or passage through its axis.When the ball rotates 90 degrees, it should be a sphere at the inlet and outlet to cut off the flow.Often used is PVC ball valve, stainless steel ball valve, cast steel ball valve.Ball valves can be closed with only 90 degree rotation and a small torque.Fully equal body cavity for the medium to provide little resistance, through the flow channel.Ball valve is most suitable for direct open and close use, but can also be used for throttling and flow control.The main characteristics of the ball valve is itself compact structure, easy to operate and maintenance, suitable for water, solvents, acids and natural gas and other general working medium, but also suitable for harsh working conditions of the medium, such as oxygen, hydrogen peroxide, methane, ethylene, resin, etc.The ball valve body may be integral or modular.