Instrumentation Valves Drive Device Classification
Instrumentation Valves drive device has the following:
The manpower-driven reduction gear is used to reduce the force required to manually operate the Instrumentation Valves, usually with multiple revolutions and partial rotary. It is characterized by simple structure, easy to operate. It is often used to drive Instrumentation Valves with a nominal diameter less than 300 mm.
The gear transmission is a mechanical transmission that utilizes the gears of the two gears to engage power and movement with each other. Gear transmission features: gear transmission is smooth, accurate transmission, reliable, high efficiency, long life, the use of power, speed and size range.
Pneumatic devices, hydraulic devices
Mostly composed of compressed gas or hydraulic pressure cylinder), a small number of pneumatic motors or hydraulic motors driven by the reducer. The former is widely used as part of the rotary and linear reciprocating drive; the latter can be used as multi-turn rotary drive, and some can be used with the electric device. They have a compact structure, fast opening and closing characteristics, suitable for indoor or corrosive, flammable and explosive environment; its drawback is more complex piping, not suitable for long-distance control. Pneumatic device pressure is generally (4 ~ 6) × 105 Pa, the output is small. The hydraulic device uses a higher pressure, the output is greater.
A device that drives a meter valve with a motor driven by a reduction mechanism. Some by the electromagnetic force to drive the Instrumentation Valves (see solenoid valve). Instrumentation Valves electric device has multi-rotary and partial rotary two types. It is characterized by convenient power supply, easy to adjust, output, suitable for remote control and automatic control needs, the use of a more extensive. But in the design and manufacture need to consider outdoor, flammable and explosive and other environmental conditions on the impact of electric devices, and the structure is more complex.
Gas - liquid linkage and electro - hydraulic linkage
By the compressed gas or power as a power source of the hydraulic mechanism. Common for some of the rotary, which is characterized by rapid action, large output, can drive large-caliber Instrumentation Valves. This device is often used in oil and natural gas long-distance transmission pipe cut-off valve or emergency automatic shut-off valve.