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What principles should be paid attention to in test items of scotch yoke pneumatic actuator
发布时间：2019-01-26 来源：艾德威尔•瑞拓
Before the Scotch Yoke Pneumatic Actuator is used formally, it should be tested for its full performance. Its test items include the deviation of starting point, end point and golden stroke. It also needs to observe the sensitivity and sealing of the scotch yoke pneumatic actuator. While ensuring safety in production, we should also consider saving investment, neatness and beauty. The following principles should be noted in installation.
(1) Regulating valves are best installed vertically in horizontal pipelines. When horizontal or inclined installation is required under special circumstances, support should be added in addition to small caliber regulating valves.
When the caliber of the control valve is different from that of the process pipe, the conical shaped pipe should be used to connect the control valve, and the threaded connection should be used for the small size control valve.
In order to prevent the ageing of the film of the actuator, it is necessary to keep away from high temperature, vibration, toxicity and serious corrosion.
The flow direction of the fluid should be the same as that of the arrow on the control valve.
_For pneumatic control valves without handwheel mechanism and occasions where handwheel mechanism is an important control system, bypass must be adopted, and cut-off valves and bypass valves must be installed. The purpose is to facilitate switching or manual operation and to repair pneumatic control valves without shutdown.
Scotch yoke pneumatic actuator in the test project, but also pay attention to the above principles, the above points, for reference only.
(1) Regulating valves are best installed vertically in horizontal pipelines. When horizontal or inclined installation is required under special circumstances, support should be added in addition to small caliber regulating valves.
(2) When choosing the installation position of the control valve, we should strive for a straight pipe section with a diameter not less than 10D (D is the diameter of the pipeline) before and after the valve, so as to avoid the serious distortion of the valve's working characteristics.
When the caliber of the control valve is different from that of the process pipe, the conical shaped pipe should be used to connect the control valve, and the threaded connection should be used for the small size control valve.
In order to prevent the ageing of the film of the actuator, it is necessary to keep away from high temperature, vibration, toxicity and serious corrosion.
The flow direction of the fluid should be the same as that of the arrow on the control valve.
_For pneumatic control valves without handwheel mechanism and occasions where handwheel mechanism is an important control system, bypass must be adopted, and cut-off valves and bypass valves must be installed. The purpose is to facilitate switching or manual operation and to repair pneumatic control valves without shutdown.
Scotch yoke pneumatic actuator in the test project, but also pay attention to the above principles, the above points, for reference only.
