Balance weight set free fall emergency braking device, which can realize auto control load loss protection, when the wellhead end accidental loss of load, balance weight free fall.
平衡重设置自由落体紧急制动装置，可实现井口端意外失载后平衡重自由落体坠落不能人控，却能自控失载保护的万无一失。
This device USES a force balance system to control the movement of the supply and exhaust valves.
本设备使用的力量平衡系统，以控制供应和排气门的运动。
The DPC is a proportional control device and can realize dynamic balance of variable flow heat-supply system.
探讨了采用板式换热器作为热力站换热设备的变流量供热系统的调节方式。
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