Excavator relief valve noise causes
Relief valve easy to produce high-frequency noise, mainly due to unstable pilot valve performance, that is, the pilot valve pre-cavity pressure caused by high-frequency vibration air vibration noise. The main reasons are:
(1) Air is mixed with air and cavitation occurs in the pilot chamber leading to high frequency noise. At this point, the air should be drained in time to prevent the outside air from re-entering.
(2) When the needle valve is worn frequently due to frequent opening during use, the conical surface of the needle valve can not be in close contact with the valve seat, leading to instable pilot flow and pressure fluctuations resulting in noise. At this time, the valve should be repaired or replaced promptly.
(3) The pilot valve due to spring fatigue deformation caused by its unstable voltage regulating function, making the pressure fluctuations caused by noise, this time should be replaced by spring.
Material Selection:
1. Frame: 2MM thicknesses cold-roll Stainless steel.
2. Motor: Germany SEW brake motor (outer), power 0.75KW, power supply 220V.
3. Control system: Imported Japan Mitsubishi converter and PLC to control of electric box (150%1HZ)
4. Opening & closing speed: 0.6-1.5m/s (adjustable).
5. Safety Device: Korea Photocell Sensor, emergency stopping reaction when sensing obstacles.
6. Curtain: France high-density polyester fiber and the surface coating processing, thickness 0.8MM, variety colors can be chose: Red, yellow, blue, green, orange, gray, white, transparent, etc. Tensile strength: 4000/3500N/5cm, tear strength 600/600N. Fire-proofing level: German standard DIN75200 Usage temperature: -30 ° C +70 ° C.
7. Wind resistant: The Aluminium alloy Reinforce Girder to increase wind resistant effect.
8. Curtain replacement function: Aluminium alloy Reinforce Girder is loaded between 2 pieces Curtain, can be replaced easily if any curtain broken, save your cost.
9. Transparent window: 1.2MM thickness transparent PVC window, size and location is up to your request, more safer.
10. Seal: Seal brush are Installed inside the guides, and the special bottom design, to fit any uneven ground.
11. Cotrolling way: Push button + radar sensor, very convenient.
12. Limiting Switch: Mechanical limiting switch, easily and exactly.
13. Emergency STOP: With emergency stop button on control panel, can stop easily by
Hand once disconnect or accident
14 Fault recovery function: All Hongfa's production is with fault recovery function, system will self-recovery after power cut off.
15. Delivery time: About 7 business days with contract and deposit confirmed.
16. Pyament item: 50% before production, and the other 50% before shipment.
17. Warranty Details: We provide 12 months warranty for all doors and accessories (except man-made disasters, Irresistible natural disasters, ect^).
We have many professional engineers with rich experience, qualified products, perfect service system, and good cooperation relationship with many famous companies.
PVC high speed door,plastic roll up doors,high speed fabric roll up doors,high speed rolling doors, pvc roll up doors
SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfarrs.com