Regulator is usually by electric actuators or pneumatic actuators and valve body two parts together, straight travel mainly through single seater and direct two-seater type two kinds, the latter has a large flow capacity, the unbalanced force is small and the characteristics of stable operation, so often especially suitable for large flow, high pressure drop and leakage big occasions, angular travel mainly include: V electric regulating valves, electric butterfly valve, ventilation control valve, eccentric butterfly valve, etc.,
The first generation product:
Since the beginning of the 20th century the nearly hundred years, regulating valve is still in the level of the first generation product, the regulating valve is characterized by:
(1) by the sixties and seventies of the 20th century level single-seat valves, two-seat valves, sleeve valve for the leading product;
(2) the generation of product function is not complete, have to depend on the expansion of product variety, variant to adapt to a variety of different occasions, the variety specification is various, used for adjusting, calculation, selection, adjustment, maintenance, spare parts and other special demanding;
(3) poor reliability, when using the problems;
(4) is very heavy,
Nowadays, more prevalent CV3000, fine small valve 30% compared with the traditional old product has more than three: weight by 30%; A 30% drop in height; Flow coefficient is increased by 30%, but they didn't bring a qualitative breakthrough, just on the traditional product improved,
The second generation product:
From the second generation product reliability, functionality, weight should be qualitative breakthrough, the regulating valve is characterized by:
(1) the ultralight regulator instead of the function of many poor reliability, the function is not complete, and very heavy product, instead of the first generation of leading products single-seat valves, two-seat valves, sleeve valve, will become the second generation of leading products;
(2) electronic fully functional ultra light valve gradually replace the traditional reliability due to the original actuators is poor, to adopt the "pneumatic valve + electric valve positioner, air supply" combination way,
Look from the exterior, the second generation product should have light-duty, miniaturization, the characteristics of the instrumentation,
The third generation product:
Its striking feature is intelligent, and meet the requirements of field bus, on the application of the characteristic is:
(1) and the computer interface;
(2) the diagnosis of further improve the reliability, failure rate decline further;
(3) improve the valve characteristic curve, and transform the control quality of the valve;
(4) the regulator of varieties, and the use of regulating valve requirements further simplification;
(5) on indicators, satisfies the requirement of modern industry reached a new level of performance, such as some industrial sector launch of the new process and system of some stringent requirements put forward by the regulator,
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