1. Selection of gate valves
In general, gate valves should be preferred. In addition to steam, oil and other media, gate valves are also suitable for media containing granular solids and high viscosity, and are suitable for venting and low vacuum system valves. For media with solid particles, the gate valve body should be equipped with one or two purge holes. For low-temperature medium, low-temperature special gate valve should be selected.
2. Globe valve selection instructions
The globe valve is suitable for pipelines with low requirements for fluid resistance, that is, pipelines or devices with little consideration of pressure loss, as well as high-temperature and high-pressure mediums, and is suitable for steam and other medium pipelines with DN<200mm; Small valves can choose globe valves, such as needle valves, instrument valves, sampling valves, pressure gauge valves, etc.; The globe valve has flow adjustment or pressure regulation, but the adjustment accuracy is not high, and the pipeline diameter is relatively small, so it is advisable to choose the globe valve or throttle valve; For highly toxic media, it is advisable to choose a bellows sealed globe valve; However, the globe valve should not be used for media with high viscosity and media containing particles that are easy to precipitate, nor should it be used as a venting valve and a valve for low vacuum systems.
3. Instructions for the selection of ball valves
Ball valves are suitable for low-temperature, high-pressure, high-viscosity media. Most ball valves can be used in media with suspended solids, but also in powdery and granular media, depending on the material requirements of the seal; The full-channel ball valve is not suitable for flow regulation, but is suitable for occasions that require rapid opening and closing, which is convenient for emergency shut-off in an accident; Ball valves are usually recommended in pipelines with strict sealing performance, wear, necking channels, rapid opening and closing actions, high pressure cut-off (large pressure difference), low noise, gasification, small operating torque, and low fluid resistance; Ball valves are suitable for light structure, low pressure shut-off, corrosive media; The ball valve is also the ideal valve for low-temperature and cryogenic medium, and the low-temperature ball valve with valve cover should be selected on the pipeline system and device of low-temperature medium; When the floating ball valve is selected, the seat material should bear the load of the ball and the working medium, the large-diameter ball valve needs a large force during operation, and the DN≥200mm ball valve should be used in the form of worm gear transmission; Fixed ball valve is suitable for larger diameter and high pressure occasions; In addition, the ball valve used for the process of highly toxic materials and combustible medium pipelines should have a fireproof and anti-static structure.
4. Throttle valve selection instructions
The throttle valve is suitable for the occasion of low temperature and high pressure of the medium, and is suitable for the parts that need to adjust the flow and pressure, and is not suitable for the medium with high viscosity and solid particles, and should not be used as a partition valve.
5. Plug valve selection instructions
The plug valve is suitable for occasions that require rapid opening and closing, and is generally not suitable for steam and high temperature media, for low temperature and high viscosity media, and also for medium with suspended particles.
6. Butterfly valve selection instructions
Butterfly valves are suitable for large diameters (such as DN>600mm) and short structural length requirements, as well as the need for flow adjustment and fast opening and closing requirements, generally used for water, oil and compressed air with a temperature of ≤80°C and a pressure ≤of 1.0MPa; Because the pressure loss of butterfly valve is relatively large compared with gate valve and ball valve, butterfly valve is suitable for pipeline systems with low pressure loss requirements.
7. Check valve selection instructions
Check valves are generally suitable for cleaning media, and should not be used for media containing solid particles and high viscosity. When DN≤40mm, it is advisable to use a lifting check valve (only allowed to be installed on the horizontal pipeline); When DN=50-400mm, it is advisable to use swing-type lifting check valve (it can be installed on both horizontal and vertical pipelines, if installed on vertical pipelines, the flow direction of the medium should be from bottom to top); When DN≥450mm, it is advisable to use a buffer check valve; When DN=100-400mm, the clamp-on check valve can also be selected; The swing check valve can be made to a very high working pressure, PN can reach 42MPa, according to the material of the housing and seals, it can be applied to any working medium and any working temperature range. The medium is water, steam, gas, corrosive medium, oil, medicine, etc. The operating temperature range of the medium is -196-800°C.
8. Diaphragm valve selection instructions
The diaphragm valve is suitable for oil, water, acidic medium and medium containing suspended solids with a working temperature of less than 200°C and a pressure of less than 1.0MPa, and is not suitable for organic solvents and strong oxidant media; For grinding granular media, it is advisable to choose a weir diaphragm valve, and the weir diaphragm valve should refer to its flow characteristics table; Viscous fluids, cement slurries and precipitating media should be straight-through diaphragm valves; Except for specific requirements, diaphragm valves should not be used in vacuum lines and on vacuum equipment.
Valve applications, operating frequencies and services are ever-changing, and it is necessary to control or eliminate even the slightest leakage, and the most important and critical equipment is the number of valves. Learning to choose the right valve is crucial.
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