使用液控单向阀的安全装置，保证安全；
Use security device of hydraulic control valve to ensure the safety.
单向阀在油气工业中广泛地用作控制装置或安全装置。
Check valves are used in a wide variety of oil and gas industry applications as control or safety devices.
安全开关保护装置，当马达过载或单向运转时，安全开关会自动切断电源。
C. safety switch protection device, when the motor is overloaded or when one-way operation, the safety switch will automatically cut off the power supply.
安全开关保护装置，当马达过载或单向运转时，安全开关会自动切断电源。
C. safety switch protection device, when the motor is overloaded or when one-way operation, the safety switch will automatically cut off the power supply.
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