Product Description

Sany Crane Multiway Valve Switching Valve Pilot Solenoid Valve 59621-2HUSCO Multiway Valve 7000CC-D29

13023927 Suitable for Sany mobile cranes STC500 use

Function:

The functions of the crane telescopic switching valve are mainly as follows:

1. **Control of the telescopic movement**
- **To realize the boom telescoping**: the telescoping switching valve is the key component of the hydraulic system of the crane telescoping mechanism, which controls the flow of hydraulic oil by switching different oil channels to realize the outstretching and retracting action of the boom. When it is necessary to extend the boom, the switching valve directs the hydraulic oil to the cylinder where the boom is extended; when it is necessary to retract the boom, the switching valve changes the oil circuit, so that the hydraulic oil returns from the cylinder where the boom is retracted, and completes the telescopic action of the boom.
- **Precise control of telescopic speed**: According to the operation demand, the opening size or throttling degree of the switching valve can be adjusted to control the flow of hydraulic oil, so as to accurately control the telescopic speed of the boom and meet the requirements of the telescopic speed of the boom under different working scenarios, such as when lifting precision equipment or carrying out delicate work, a slower telescopic speed is needed to ensure safety and accuracy.

2. **Guarantee system stability**
- **Balance pressure and flow**: During boom extension and retraction, the telescopic switching valve can automatically adjust the pressure and flow of the hydraulic system to ensure that the system is always in a stable working condition. When the boom extends, with the change of load and the change of boom attitude, the system pressure will change accordingly, and the switching valve can adjust the oil circuit in time to keep the pressure stable and prevent the hydraulic system from being damaged due to too high or too low pressure.
- **Avoid shock and vibration**: By reasonably controlling the flow of hydraulic oil, the telescopic switching valve can reduce the shock and vibration of the boom in the process of telescoping. When the boom is close to the full extension or full retraction position, the switching valve can gradually reduce the flow of hydraulic oil, so that the boom stops smoothly at the target position, avoiding shocks and vibrations due to sudden stopping, and protecting the crane's mechanical structure and connecting parts.

3. **Adaptation to different working conditions
- **Adapt to different working conditions**: Different lifting operations have different requirements on the telescopic range and attitude of the boom, and the telescopic switching valve can flexibly adjust the telescopic state of the boom according to the specific operation tasks. For example, when carrying out low-altitude work, the boom needs to be shortened and kept in a lower position; while when carrying out high-altitude work or long-distance lifting, the boom needs to be fully extended and reach a suitable angle, the switching valve can meet the needs of these different working conditions.
- **Compensates for load changes**: In practice, the load of the crane may change, which will affect the telescopic performance and stability of the boom. The telescopic switching valve can automatically adjust the working parameters of the hydraulic system according to the change of load to compensate for the influence caused by the change of load and ensure that the boom can work normally under different loads.

4. **Safety protection function**
- **Overload protection**: when the load of the crane exceeds the rated value, the telescopic switching valve can monitor the abnormal rise of the system pressure and prevent the boom from continuing to extend and retract by restricting the flow of hydraulic oil or cutting off the oil circuit, etc., to avoid damage to the crane due to overload, which plays a role in protecting the safety of the crane.
- **Failure alarm**: some telescopic switching valves are also equipped with failure alarm device, when the hydraulic system malfunction or abnormal situation, it can send out the alarm signal in time, reminding the operator to carry on the inspection and maintenance, in order to find and remove the trouble in time, and ensure the safe operation of the crane.