Overflow throttle works

The overflow throttle valve is also a type of pressure-compensated flow control valve, designed to maintain a stable flow rate despite changes in load. It consists of a relief valve (valve 3) and a throttle valve (valve 2) connected in parallel. High-pressure oil from the pump (p1) is split into two paths: part of it flows through the throttle valve to the actuator, where it experiences a pressure drop to p2, while the remaining portion is directed through the relief valve back to the tank. The lower end of the relief valve is connected to both the inlet pressure (p1) and the outlet pressure (p2) of the throttle valve. When the outlet pressure (p2) increases due to a higher load, the spool inside the relief valve moves downward, partially closing the overflow port. This increases the resistance to the overflow, which in turn causes the inlet pressure (p1) to rise slightly. As a result, the pressure difference across the throttle valve (p1 - p2) remains relatively constant, ensuring that the flow through the throttle is largely unaffected by the load variations. Unlike speed control valves, the relief valve in an overflow throttle system must be connected to the inlet side of the actuator. This configuration allows the pump outlet pressure (which is also the inlet pressure of the throttle valve) to adjust dynamically with the load pressure (p2). This makes the system function as a kind of pressure transformer, improving energy efficiency and reducing heat generation within the hydraulic system. The pressure compensation mechanism ensures smooth and stable operation, making the overflow throttle valve a reliable choice for applications requiring consistent flow control under varying load conditions.

Vacuum Feeder

The ZKS vacuum feeder uses a vacuum pump to pump air, so that the inlet of the suction nozzle and the whole system are in a certain vacuum state. The powder and particles are sucked into the nozzle along with the outside air to form a material air flow, and then reach the hopper through the suction pipe. Separation of gas and material in the middle. The separated material enters the receiving equipment. Conveying and discharging are accomplished through the continuous opening and closing of the pneumatic three-way valve, and the opening and closing of the pneumatic three-way valve is controlled by the control center.

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