Description
Product introduction:
Model: 8212
Name: electric-pneumatic valve positioner
Manufacturer: Shanghai Automation Instrumentation Co., Ltd.
Application: 8212 electric-pneumatic valve positioner is a pneumatic control valve commonly supporting instruments, it outputs a certain signal control pressure regulating valve is formed to accept 4 ~ 20mA DC signal and the feedback system allows the stroke changes in proportion to the signal, so as to ensure valve positioned correctly.
Electric - gas valve positioner according to electrical safety regulations explosion hazard place, according to GB3836 "explosive gas atmospheres with explosion-proof electrical equipment" standard, designed as intrinsically safe (proof mark Exia II CT6) and proof (proof mark Exd II BT4) two forms.
Pneumatic control valve with electric - gas valve positioner after the stem can overcome the friction and eliminate unbalanced force affecting control valve, can increase the operating speed, precision displacement valve, to achieve sub-process control and operation of non-standard pneumatic signal film executive body, etc., so electric - gas valve positioner with pneumatic control valve package was widely used in petroleum, chemical, metallurgical, power plants, and textile and other industrial sectors of the automatic control system.
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Positioner type |
Explosion-proof type |
Feedback type |
Temperature range |
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Electric-pneumatic positioner |
0.flameproof(positive action) 1.flameproof(reaction) 2.intrinsically safe(positive action) 3. intrinsically safe(reaction) |
0.leveraged(straight trip) 2.cam(50 degree angle) 3.cam(75 degree angle) 7.cam(36 degree angle) |
None: standard (-30~+70C) L: low temperature (-50~+60c) H:high temperature (0-100C) |
structure
8100 pneumatic valve positioner mainly housing, torque motors, zero body, nozzle flapper, amplifiers, feedback lever gone, junction boxes and other components.
8100 pneumatic valve positioner design and work according to the principle of torque balance
1) leveraged locator works:
When the torque motor coil accept input current signal to the reed as a fulcrum for the armature rotates clockwise, then baffle near the nozzle, pressure nozzle back pressure chamber rises, the diaphragm assembly to promote pilot valves, air pressure, that is an output pressure into the actuator chamber, the push rod displacement, and transmitted to the lever, feedback and adjustment board member, and then produced by the feedback spring force on the armature. When the feedback spring torque and torque generated by the motor torque generated by the balance, putting the actuator that is held in a certain position, and thus the input current signal and the valve stroke corresponding contrast between form.
2) Cam locator works:
When the torque motor coil accept input current signal to the reed as a fulcrum for the armature rotates clockwise, then baffle near the nozzle, pressure nozzle back pressure chamber rises, the diaphragm assembly to promote pilot valves, air pressure, that is an output pressure into the actuator chamber, the push rod displacement, and transmitted to the lever, cam, push rod, and the adjustment member, and through the feedback spring generates a force acting on the armature. When the feedback spring torque and the torque generated by the torque generated by the motor balance, i.e., the push rod actuator is maintained at a predetermined position, thus the input current signal formed with the valve (stem angle) is formed corresponding to the proportional relationship.
Technical Parameters
The product standard code : Q / YXBM931
The main technical parameters
Input signal : 4 ~ 20mA.DC; split-range signal : 4 ~ 12,12 ~ 20mA.DC
Gas supply : 0.14 ~ 0.6MPa
Air consumption : ≤450L / h ( under standard conditions air pressure is 0.14MPa)
Impedance : 250 ± 25Ω
The basic error : ≤ ± 1% ( leveraged ); ≤ ± 2.5% ( Cam )
Hysteresis : ≤1% ( leveraged ); ≤2.5% ( Cam )
Dead : ≤0.4 ( leveraged )
Air Connection : M10 × 1
Electrical wiring excuse : M20 × 1.5, NPT1 / 2
Forming range equipped with actuators :
Straight stroke: 10 to 60 mm (with 6 mm , 100 mm stroke when ordering) ;
Rotary : 0 ~ 90 °
Insulation resistance : ≥20MΩ
Protection in the form of : common type ;
Explosion-proof : Exd II BT4 ( explosion proof ); Exia II CT6 ( intrinsically safe)
Shell protection: IP55
Ambient temperature : -25 ℃ ~ + 55 ℃
Relative humidity: 5 % to 100%
Dimensions : 293 × 93 × 188
Weight: 2.1KG
Shanghai Automation Instrumentation Co., Ltd.NO. 11 AUTOMATION INSTRUMENTATION FACTORY
Shanghai Yi Electric Actuator
SHANGYI ELECTRIC ACTUATOR
SHANGYI BRAND
