Chinese
The desktop manual hydraulic pressure source is a manually operated device that uses a liquid medium to generate pressure. It is used for calibrating and testing liquid pressure instruments. This manual provides detailed instructions on equipment operation, medium handling, pressure control, maintenance, and other key aspects, ensuring the accuracy and safety of pressure calibration tasks.
**I. System Configuration and Preparation**
The equipment should be installed on a dedicated workbench with a surface levelness of 0.1 mm/m and a load-bearing capacity of at least 100 kg. The operating environment should have a temperature of 20±5°C and a humidity level of 30-70%. A drainage system must be in place. As for the medium to be used, distilled or deionized water is recommended, with a conductivity of less than 5 μS/cm and a pH value between 6.5-7.5. The dissolved gas content in the water should be less than 2 mg/L; degassing may be necessary if required. For filtration, use a two-stage system: the first stage has a filtration precision of 10 μm, while the second stage achieves 1 μm precision. Filter elements should be replaced monthly or when the pressure drop exceeds 0.1 MPa.
**System Air Release:** Open all air release valves and slowly introduce the medium until air continues to flow from the valves. Repeat this process 3-5 times to ensure no air remains in the system. **Pipe Connection:** Use stainless steel or pressure-resistant hoses with an inner diameter of 8-10 mm. The hose’s pressure resistance should be at least twice the maximum pressure handled by the equipment. Use cone-shaped seals with uniform pre-tightening force. After connection, perform a pressure test at 1.5 times the working pressure and hold it for 10 minutes without any leaks.
**II. Pressure Operation Techniques**
**Pressure Increase:** Turn the handwheel clockwise at a rate of 5-10 revolutions per minute. Monitor the pressure rise curve and reduce the speed as you approach the desired pressure. **Fine Tuning:** Use a precise tuning mechanism to adjust the pressure with a sensitivity of 0.01% of the full scale. Move the handwheel smoothly to avoid shocks. **Pressure Holding:** Once the target pressure is reached, lock the handwheel and check the stability of the pressure. At the rated pressure, the pressure should not drop by more than 0.1% of the full scale within 5 minutes.
**Pressure Decrease:** Slowly open the pressure relief valve, reducing the pressure at a rate of 3-5% per minute. Wait for 1 minute when the pressure approaches zero to ensure complete release. **Cycle Testing:** Perform 3 complete cycles of increasing and decreasing pressure to verify consistency. The pressure points during these cycles should be 0%, 20%, 40%, 60%, 80%, and 100% of the full scale. **Temperature Control:** Maintain a stable system temperature before each pressure increase, with a temperature difference of no more than 1°C. Record the medium’s temperature and adjust it accordingly using the liquid’s compressibility coefficient.
If you’re interested in purchasing a desktop hydraulic pressure source, consider our KT100/KT105/KT106 models.