(1) metal material valves: valve body and other parts made of metallic material. Such as cast iron valves, cast steel valves, valve steel, copper alloy valve, aluminum valve, lead alloy valves, titanium valves, Monel valve.
(2) non-metallic materials valves: valve body and other parts are made of non-metallic materials. Such as plastic valves, ceramic valves, ceramic valves, glass steel valves.
The following is some stainless steel valve material parameters and specific application
(1) Rotary include ball valves, butterfly valves, plug valves, etc. and
(2) straight trip includes a gate valve, angle seat valve.
This classification not only by theory, the role of the structure divided, is the world, the most commonly used classification methods. General points valve, globe valve, throttle, instrument valves, piston valves, diaphragm valves, plug valves, ball valves, butterfly valves, check valves, pressure reducing valve, steam trap, control valve, foot valve, filter, blowdown valve.
As the valve use is widespread, so it’s role is great. For example: In a power plant valve to control the boiler and turbine operation; in petroleum, chemical production, valve control also plays a normal operation of all production equipment and processes. In other sectors as well. Nevertheless, valves comparison with other products is often overlooked. For example: When installing the equipment, people tend to focus on the main machinery equipment, but ignored the valve. This will make the whole production efficiency is reduced or discontinued, or causing all sorts of other accidents. Therefore, the valve selection, installation, use and so must be serious and responsible work.
Electric drive valve is a valve commonly driven approach, often call this form of drive means driving means for the valve actuators, valve actuators characteristics are as follows: 1) open and close rapidly, can greatly reduce the time required to open and close the valve; 2) can greatly reduce labor intensity, especially suitable for high pressure, large diameter valve; 3) suitable for installation in can not be manually operated or inaccessible location, easy to implement remote manipulation, and mounting height unrestricted; 4 ) in favor of the automation of the entire system; 5) Power than air and liquid source readily available, its cable laying and maintenance is much simpler than compressed air and hydraulic lines.
Shortcoming valve actuators is to construct complex, the use in wet areas more difficult, when used in explosive medium, we need proof measures.
Valve actuators driven by valve types, Z and Q can be divided into two categories. Output shaft Z type valve electric device can turn out a lot of laps, suitable for driving valve, closing valves, diaphragm valves, etc; Q output shaft type rotary valve actuators only 90. Suitable for driving plug, ball and butterfly valves. According to their type of protection are common type, flameproof (expressed in B), heat-resistant (represented by R) and triple-type (ie outdoor, corrosion, explosion, represented as S).
Valve actuators in general by the drive mechanism (reducer), the motor, the stroke control mechanism, the torque limiting mechanism, manual – electric switching mechanism, opening indicator and other components.