The pressure regulating valve is a kind of flow control valve composed of a check valve and a throttle valve in parallel. According to the direction of the one-way valve opening, it can be divided into two types: exhaust throttle and intake throttle.

Exhaust throttling: It is easy to adjust the flow speed of the cylinder, and runs the cylinder piston  stably, which is a common circuit component;

Air intake throttling: Although it can also control flow changes, it is difficult to control the speed stability. It is generally controlled the speed of single-acting cylinders, compact cylinders, and low-friction cylinders.

After understanding the difference between exhaust throttling and intake throttling, let's study the movement principle of them.

Exhaust throttle

When the air flows into the cylinder through the speed control valve, the airflow flows freely through the one-way valve, and the throttle valve does not work, and the flow cannot be adjusted; on the contrary, when the cylinder gas is discharged outward, the change of the valve stem position (that is, It is the flow control in the figure) to change the throttle opening to achieve the flow rate change.

Intake throttle

When the gas flows into the cylinder through the speed control valve, the throttle opening is changed through the change of the valve stem position (that is, the flow control in the figure), to realize the flow rate change; on the contrary, when the gas in the cylinder is discharged outward, The airflow flows freely through the one-way valve, the throttle valve does not work, and the flow cannot be adjusted.