Flat gate valve​Use, maintenance, maintenance precautions

Flat gate valve use, maintenance, maintenance  precautions

1. The strength  sealing tests have been done before the valve leaves the factory,  all connections should be kept in the initial state during use.

2. The operating handwheel of this series of valves is marked with the sign of opening  closing rotation,  the upper part of the open rod type is equipped with an opening  closing height scale for adjustment instructions.

3. When the valve is welded with the pipeline, the valve should be opened,  the neck should be properly protected with damp material to minimize high temperature heat conduction to prevent damage to the sealing packing.

4. When closing the valve, it is strictly forbidden to use the booster rod. When the gate is closed to the top, the handwheel should be rotated 1/2 turn to make the gate in a floating state.

5. During the use of the valve, quantitative grease should be injected into the bonnet grease joint regularly.

6. If the valve leaks due to wearing parts during use, it should be replaced in time.

7. During the maintenance process of the valve, the inner cavity should be cleaned,  each transmission part should be greased during assembly.

8. During the period of valve storage  deactivation, the gate should be in the closed position. For long-term storage, it should be placed in a ventilated  dry place,  regular inspection  maintenance should be carried out.

internal structure

1. The valve seat adopts O-ring sealing  floating valve seat structure with pre-tightening force, so that the inlet  outlet of the flat gate valve are sealed in both directions;  the opening  closing torque of this structure is only 1/2 of the ordinary valve, which can achieve easy opening  closing. Close the valve

2. When fully open, the channel is smooth  straight, the flow resistance coefficient is small, there is no pressure loss,  the pipeline can be cleaned through the hair ball

3. The packing structure with self-sealing capability is adopted, which does  need to be adjusted frequently, is easy to open  close,  has reliable sealing performance. There is an auxiliary sealing grease injection structure at the stuffing box, which has reliable sealing performance  achieves zero leakage; it solves the problem of general valve packing. Disadvantages of easy leakage

4. When the flat gate valve is closed, the high pressure in the inner cavity can be automatically removed to ensure safe use

5. Fully enclosed structure, good protection performance, can adapt to requirements

6. The sealing structure of the valve seat should be elastic  preloaded,  the upstream  downstream sealing seats are sealed at the same time. There is always a face-to-face seal between the valve seat  the seal.

7. The valve seat has a self-cleaning function,  is  directly scoured by the airflow during the opening  closing of the valve. Seats should be made of lubricated, non-wearing material.

8. The failure of the valve actuator will  affect other parts of the valve,  maintenance  replacement work can be carried out without dismantling the valve.

9. Yoke Sleeves – Aluminum bronze yoke sleeves are configured with needle thrust bearings to reduce operating torque.

10. Stem – threaded length up to bracket; pinned  spot welded; for stability.

11. Pressure Seal – Simple structure with segmented retaining ring  silver plated mild steel gasket to facilitate disassembly  bonnet sealing.

12. Seat Rings – Welded seat rings are perpendicular to the flow passage for easy maintenance.

13. Actuators – These valves can be configured with electric, hydraulic  pneumatic actuators. Below DN300 is equipped with standard manual handwheel,  above DN350 is equipped with helical gear operating mechanism.

14. Yoke – Fully fabricated yoke is shock tested for easy maintenance  actuator installation.

15. Gland – Two-piece, self-adjusting gland to avoid being ejected.

16. Integral back seat – hard surface for long life.

17. Disc – Spring-loaded disc is self-adjusting, reducing torque requirements for the actuator.

18. Integral stop – The integral casting bracket stop device locates the assembled bracket valve disc, making the valve seat more stable  reliable.

19. The valve body has two structures of casting  welding.

20. The valve seat adopts O-ring sealing  floating valve seat structure with pre-tightening force, so that the inlet  outlet of the valve are sealed in both directions;  the opening  closing torque of this structure is only 1/2 of the ordinary valve, which can easily open  close valve.

21. For metal-to-metal sealing valves, there is a grease injection structure outside the valve body. The grease enters the valve sealing surface through the grease injector  the valve seat, so that the valve can achieve zero leakage.

22. The valve seat is inlaid with PTFE on the sealing surface, which has double sealing of PTFE to metal  metal to metal,  the PTFE sealing surface can remove the dirt of the gate at the same time.

23. The gate plate  valve seat are treated with special process, spray-welded hard alloy, wear-resistant PTFE,  realize double sealing. It can also be injected with grease to assist the double protection of the seal, which is more reliable  has a longer service life.

24. The gate of the valve with diversion hole, whether it is fully open  fully closed, is always in line with the sealing surface,  the sealing surface is protected  direct erosion by the medium, thereby prolonging the service life.

25. When the valve is fully opened, the channel is smooth  straight, the flow resistance coefficient is small, there is no pressure loss,  the pipeline can be cleaned through the hair ball.

27. When the valve is closed, the high pressure in the inner cavity can be automatically removed to ensure safe use.

28. The fully enclosed structure has good protection performance  can meet the basic requirements.

29. The valve is provided with an indicator rod  observation window to indicate the opening  closing of the valve.