Stainless steel flat gate valve
Overview
The flat gate valve is a sliding valve whose closing part is a parallel gate. The closing member can be a single gate or a double gate with a spreading mechanism in between. The pressing force of the gate to the valve seat is controlled by the medium pressure acting on the floating gate or floating valve seat. If it is a double gate flat gate valve, the expansion mechanism of the two gates can supplement this pressing force.
Specifications
Product features
1. The valve seat adopts an O-ring seal and a floating valve seat structure that applies preload force, so that the inlet and outlet of the flat gate valve are sealed in both directions; and the opening and closing torque of this structure is only 1/2 of that of ordinary valves, making it easy to open and close. close valve
2. When fully open, the channel is smooth and straight, the flow resistance coefficient is extremely small, and there is no pressure loss. The pipeline can be cleaned through the hair ball.
3. It adopts a packing structure with self-sealing ability, which does not require frequent adjustment. It is extremely light to open and close, and the sealing performance is reliable. The stuffing box is equipped with an auxiliary sealing grease injection structure, and the sealing performance is absolutely reliable, truly achieving zero leakage; solving the universal problem. The most common disadvantage of valve packing is leakage
4. When the flat gate valve is closed, it can automatically remove the high pressure in the inner cavity to ensure safe use.
5. Fully enclosed structure, good protective performance, adaptable to all-weather requirements
6. The sealing structure of the valve seat should be elastic and pre-tightened, with the upstream and downstream sealing seats sealed at the same time. There is always a face-to-face seal between the valve seat and the seal.
7. The valve seat has a self-cleaning function and is not directly washed by air flow during the opening or closing process of the valve. The valve seat should be made of lubricated, non-abrasive material.
8. Failure of the valve actuator will not affect other parts of the valve, and repair and replacement work can be performed without dismantling the valve.
9. Yoke bushing – The aluminum bronze yoke bushing is equipped with a needle thrust bearing to minimize operating torque.
10. Stem – thread length to bracket; pins and spot welds; for stability.
11. Pressure seal – Simple structure, equipped with segmented retaining rings and silver-plated mild steel gaskets to facilitate disassembly and achieve the best bonnet seal.
12. Seat ring – The welded seat ring is perpendicular to the flow channel and is easy to maintain.
13. Actuator – These valves can be equipped with electric, hydraulic or pneumatic actuators. Below DN300, it is equipped with a standard manual handwheel, and above DN350, it is equipped with a helical gear operating mechanism. 14. Yoke – The fully assembled yoke has passed seismic tests and is easy to maintain and install the actuator.
15. Gland – two-piece, self-adjusting gland to avoid being ejected.
16. Integral rear seat – hard surface, longest service life.
17. Disc – The spring-loaded disc is self-adjusting, reducing torque requirements on the actuator.
18. Integral stop – The integral cast bracket stop device positions the assembled bracket valve disc, making the valve seat more stable and reliable.
19. The valve body has two structures: casting and welding.
20. The valve seat adopts an O-ring seal and a floating valve seat structure that applies preload force to make the valve inlet and outlet sealed in both directions; and the opening and closing torque of this structure is only 1/2 of that of ordinary valves, making it easy to open and close. valve.
21. Metal-to-metal sealing valves have a grease injection structure on the outside of the valve body. The grease enters the valve sealing surface through the grease injector and the valve seat, making the valve achieve zero leakage.
22. The valve seat is inlaid with PTFE on the sealing surface, which has double sealing of PTFE to metal and metal to metal. The PTFE sealing surface can also remove dirt from the gate plate.
23. The gate plate and valve seat are treated with special technology, spray-welded with carbide and wear-resistant PTFE to achieve double sealing. It can also be filled with grease to assist sealing for double protection, making the sealing more reliable and the service life longer.
24. The gate plate of the valve with a diversion hole always matches the sealing surface whether it is fully open or fully closed. The sealing surface is protected from direct erosion by the medium, thereby extending the service life.
25. When the valve is fully open, the channel is smooth and straight, the flow resistance coefficient is extremely small, there is no pressure loss, and the pipeline can be cleaned through the hair ball.
26. This valve adopts a packing structure with self-sealing ability, which does not require frequent adjustment. It is extremely light to open and close, and the sealing performance is reliable. The stuffing box is equipped with an auxiliary sealing grease injection structure, and the sealing performance is absolutely reliable, truly achieving zero leakage; Solution This eliminates the problem that the general valve packing is most prone to leakage.
27. When the valve is closed, it can automatically remove the high pressure in the inner cavity to ensure safe use.
28. Fully enclosed structure, good protective performance, adaptable to all-weather requirements.
29. The valve is equipped with an indicator rod or observation window to indicate the opening and closing of the valve. Nominal diameter: DN25~1000mm
Product advantages
Flat gate valves can be divided into manual flat gate valves, pneumatic flat gate valves and electric flat gate valves according to the driving mode. According to the purpose and usage occasion, it can be divided into flat gate valves with diversion holes, flat gate valves without diversion holes, oil field flat gate valves, pipeline flat gate valves and gas flat gate valves, etc. When the medium pressure is low, the sealing force of the metal sealing surface is not enough to achieve a satisfactory seal. On the contrary, when the medium pressure is high, if the sealing surface is not lubricated by system medium or external medium, frequent opening and closing may cause excessive wear of the sealing surface. Another shortcoming is that the circular gate that moves laterally on the circular flow path is only more sensitive to flow control when it is at 50% of the valve's closed position. Moreover, the gate will produce severe vibration when cutting off the high-speed and high-density medium flow. If the valve seat is made into a V-shaped port and guided closely with the gate, it can also be used as a throttling valve.
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