Introduction to the working principle of Japan CKD time delay valve

Two-position three-way pneumatic delay valve. When there is no confidence PL, the spool is in the return spring force and air pressure

With the next reset, the P port is closed, and A and R are connected. When there is a signal pressure PL, the gas closes the one-way valve on the one hand, and inflates the fixed air chamber through the adjustable flow valve on the other hand, and the pressure is continuously increased. When the air pressure acting on the piston is greater than the spring force, the piston pushes the push rod downward, firstly contacts the valve core to seal the R port, and then CKD pushes the valve core again to make P and A communicate. This realizes that the pressure at the A port is longer than the pressure at the PL port. When the signal pressure is removed, the pressure in the chamber is pushed open and the exhaust valve is quickly exhausted from the EH. The pressure in the air chamber drops to a certain value, and the piston and the spool are reset. This valve achieves a normally-off delay state. The time from the start of the signal pressure to the output pressure of port A, CKD is called the delay time of the delay valve. It is related to the opening of the throttle valve and the magnitude of the signal pressure, see Figure 11-147. When the inlet pressure and the signal pressure are both rated values, the delay interval obtained by changing the throttle opening CKD is called the delay time range. At any set point within the delay range, if the change in signal pressure is within ±10% of the rated value, the ratio of the maximum deviation of the delay time to the delay time at the rated signal pressure is called the delay valve. Delay accuracy. The time from the output signal to the disappearance of the output signal is called the recovery time. It is related to the effective sectional area of the exhaust runner (ie, the effective cross-sectional area of the valve and the pipe diameter and length of the exhaust pipe) and the signal pressure and inlet pressure.