The balance valve, also known as the speed limit lock, is an externally controlled internal discharge type one-way sequence valve. It is used by a one-way valve and a sequence valve. In the hydraulic circuit, the oil in the hydraulic cylinder or motor oil circuit can be blocked. The liquid makes the hydraulic cylinder or motor not fall due to the load's own weight, and at this time it acts as a lock.
When the hydraulic cylinder or the motor needs to move, the movement is achieved by passing the liquid to the other oil passage and simultaneously opening the circuit through the internal valve of the balance valve control sequence valve. Since the sequence valve itself is different from the structure of the two-way hydraulic lock, it is said that a certain back pressure is established in the working circuit during operation, so that the main work of the hydraulic cylinder or the motor generates a negative pressure due to the self-weight overspeed falling, so no Shock and vibration like a two-way hydraulic lock. Therefore, the balancing valve is generally applied to a circuit that has high speed and heavy load and has a certain speed stability requirement.