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Introduction valve coefficient

1, the valve coefficient introduced
Determination of the valve is usually the valve coefficient, the valve coefficient, also known as valve flow coefficient. When the valve selection for special working conditions, the use of valve technology to determine the valve size, the valve can be stable under the control of process fluid can flow through the need. Valve manufacturers often publish data on all types of valves, he is approximate value, and the pipeline structure or the seat in accordance with changes in manufacturing and up 10%.
If a valve can not be calculated correctly, usually weaken one of the two valves are failing performance: If the technology needed to run too small, then the valve itself or the spool valve size is not enough, will process system is not enough traffic. In addition, because the closure of the valve upstream pressure increased back to live and lead in the valve upstream of the pump or other upstream equipment damage arising prior to the high back pressure. Size will produce enough of the higher valve pressure drop, he will lead to the phenomenon or the flash hole.
If the calculated value of the system needs more high, usually use a size larger than the valve. Clearly, a large size valve fraud, size and weight are major disadvantages. In addition, if the valve is a closure operation, the control issues are clearly occur. Normally closed device, such as the cock or valve plate, is located outside the valve seat, he may have high pressure drop and the faster flow rate caused by cavitation and flashing, or wear parts spool. In addition, if the closure device in the valve seat on closing and the operation he has control over the position, he will be sucked to the seat. This phenomenon is called locking effect of melting tank.
2, c definition
1 is defined as a U.S. gallon (3.78 kg) of water in 60 ℉ (16 ℃) when passing through an opening (such as valves), in a minute to produce a psi (0.1bar) pressure drop. By the American Instrument Society (ANSI / ISA) Standard S75.01 provides a simplified formula is:
C = logistics × m

Related Category: Valve Technology

Related Keywords: Large Solenoid Valve  Water Solenoid Valves  Solenoid Valves