Classification and the valve face many complex variety of operating conditions, installation of piping systems to choose the most suitable valve products, we must first understand the characteristics of the valve; should have followed the steps and the basis for selection valve; addition should follow Select the oil industry, chemical industry with the principle of the valve.
Choice of oil valves, chemical valves principle: for the straight-through flow valve, the fluid resistance is small, usually chosen as the cut-off valve and open media use; plug valves and ball valves are more applicable for use to the diversion; easy to adjust the flow control valve as a flow with; off pieces along the sealing surface of the slide valve with a wipe is ideal for the role of the media with suspended particles.FORGED VALVE,FORGED VALVES,FORGED STEEL VALVE,FORGED STEEL VALVES
First, the cut-off valve and open media use
For the straight-through flow valve, the fluid resistance is small, usually chosen as the cut-off valve and open with the media. Closed down valve (valve, plunger valve) due to its tortuous flow channel, high flow resistance than other valves, it is less used. Allow a higher flow resistance in the occasion, the choice of closed valves.
Second, for valves used to divert
According to the diversion of the need for such valves can have three or more channels. Cock and ball valve is more suitable for this purpose, therefore, most of the shunt valve to be used for plug and ball valves are selected in such a valve. However, in some cases, other types of valves, as long as two or more valves connected to each other properly, can also be used for changing the shunt.
Third, the control flow with the valve
Often choose easy-to-adjust flow control valve as the flow rate used. Closed down valve (eg valve) for this purpose, because it's seat and shut down parts of the stroke size is proportional to the relationship between. Rotary valves (plug valves, butterfly valves, ball valves) and valve body deflection (clamping valves, diaphragm) can also be used for throttle control, but usually only in a limited range of application of the valve diameter. Gate valve is a disc-shaped cross-section of the circular seat to do the mouth movements, it is only close to the closed position, in order to better control the flow, it is usually not used for flow control.
Fourth, the media with suspended particles with valve
When the medium with suspended particles, the most suitable for the use of its off pieces along the sealing surface of the slide valve with a wipe effect. If you turn off pieces of the seat back and forth movement is vertical, then it may be gripping grain, so the valve sealing surface material can be allowed unless the embedded particles, or only for basic cleaning of medium. Ball valve, plug valve, butterfly valve in the open and close during the course of the sealing surface are clean effect, it is suitable for use with suspended particles in the medium.
At present, both in the petroleum, chemical industry, or in other sectors of the piping system, valves application, operating frequency and the ever-changing services to even the low control or eliminate the leakage, the most important and most critical equipment or by the valve. The final control is the pipe valve, valve service in all industries and reliable performance is unique
