Valve drive by the movement can be divided into straight and angular travel two. Straight-stroke drive device that is multi-rotary valve drive device, mainly applicable to all types of gate valve, globe valve and throttle, etc .; angular travel device that is only 90 ° corner rotation part of the rotary drive, Valve Control Actuators mainly for all types Of the ball valve, butterfly valve and so on.
The valve drive can be divided into manual (handle hand wheel type, spring lever type), electric (electromagnetic type, electric type), pneumatic (diaphragm type, cylinder type, leaf type, air engine type, film and ratchet combination type ), Hydraulic (hydraulic cylinder, hydraulic motor), Valve Control Actuators linkage (electro-hydraulic linkage, gas-liquid linkage) and other forms.
In all types of valve drive, the electric device is dominant, it is mainly used in closed-circuit valve.
Pneumatic devices have been widely used in explosion-proof applications, including thin-film pneumatic devices are mainly used in the control valve. Valve Control Actuators The hydrodynamic device is widely used on natural emergency shut-off valves and wellhead ejectors on long-haul pipelines.
Manual handwheels, most of which are mounted on low, medium pressure shutoff valves and gate valves;
Handle is used for high pressure and high pressure cut-off valve, ball valve and cock and other valves.
Gas-liquid linkage device, Valve Control Actuators used for gas pipeline, no power of the field, its power source that is the gas pipeline.
The purpose of the valve drive:
VA-3000, VA-7000 Series Valve Driver Overview
VA-3000, VA-7000 series valve driver for the straight runner
Widely used in heating and ventilation, air conditioning series.
VB-3000 and two-way or three-way VB-3000 series DN25-DN50 regulating valve, supporting the use.
VA-7000 and two-way or three-way VB --- 7000 series DNB5 ---- DN200 regulating valve supporting the use of.
VA ---- 3000 and VA --- 7000 have two basic models;
VA-7100 (VA-3100) reversible electric operation provides incremental control.
VA-7012 (VA-3102) accepts input from 0-10V or 4-20mA DC control signals, providing proportional control with output feedback of 0-10V or 4-20mA.
VA-3000 for 12m, 19m, 22m travel.
VA ---- 7000 for 24m, 38m, 44m of the trip, double proportional control type of travel by a jumper to choose.