Compared with other valve driver installation, electric drive installed with power supply common, character of rapid operation, lunch, and easy to satisfy all kinds of control request. So the driver installation, the valve electric installed dominant position. electric installation according to the input mode is divided into many back transformation ( Z) And partial back transformation ( Q) Two kinds, the former is used for lifting lever type valves, include gate valve, cut-off valve, throttle valve, estrangement valve, etc. ; The latter used for rotary screw type valves, including ball valves, plug valves, butterfly valves, etc. , usually in 90 degrees within the scope of opening and closing. electric installation by protective type divided into two types: regular and special protection. The use of ordinary electric installation environment is as follows: the environment temperature: - 25 ~ 40 ℃ environment relative humidity is 90% or less ( 25 ℃) At an altitude of 1000 m or less work environment request does not contain corrosive, inflammable, explosive medium such as Industrial Valves working environment conditions beyond the ordinary electric installation has to, to the use of special protection type products, this kind of product according to the working environment and has a variety of types. Special protection type electric installation of the main technical characteristics of the type of main features 1, outdoor environment temperature: - 40 ~ 40 ℃, the maximum rainfall 2:50 mm / 10 min3, maximum intensity of solar radiation: 1. 4 j/cm2 min4, sand, snow and frost, dew temperature type highest temperature can reach 80 ℃ low temperature type low temperature to - 55 ℃ anti-corrosion type has one or more than one with a certain concentration of chemical corrosive medium environment type high speed turn the valve stem top speed 70 r/min explosion-proof type should be able to work in the environment of explosive medium ship type is suitable for the existence of sea water or salt spray on the ship of the refractory in the environment should be able to fire in the attack ( Such as the temperature of 1300 ℃) Environment, in a certain time ( Like 15 min) Range is normally open or closed type double speed double speed range up to 60:1 diving type water resistant Ⅰ type suitable for short-term immersion working environment ( 10mm、72h） ; Water resistant Ⅱ type is suitable for long-term immersion of working environment, the depth of the water can be more than 10 m anti radiant places with special request is suitable for the nuclear power plant valve electric installation protected code code protection type explosion-proof type R heat-resistant type B BWF outdoor, anti-corrosion, explosion-proof type
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