|product||GOST Gas flat gate valve|
|product 2||GOST natural gas flat gate valve
GOST lpg flat gate valve
GOST Gas flat gate valve
GOST natural gas flat gate valve
GOST lpg flat gate valve
|The main material||WCB|
|Flange hole size||GOST 12820|
|Nominal diameter (MM)||DN50-DN800|
|Nominal pressure (MPA)||1.6|
|Spool / ball||16MN|
|Flange sealing surface||（RF)/ （FF) /
（FM) / （M)
|Product Introduction||Product Introduction
KZ43WF 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 application, it can be divided into flat gate valves with diversion holes, flat gate valves without diversion holes, oilfield flat gate valves, pipeline flat gate valves and gas flat gate valves.
Features of Product
The product adopts a new floating sealing structure, which is suitable for oil and natural gas pipelines whose pressure is not more than 15.0MPa and temperature is -29～121℃. As a control device to open & close and adjustment the medium, the product has a novel structure design, appropriate material selection, strict testing, light and convenient operation, strong corrosion resistance, wear resistance, and erosion resistance. It is an ideal new equipment in the petroleum industry.
Product Selection Principle
Adopt floating valve seat, reliable two-way sealing, flexible opening and closing.
The gate has a guide bar for precise guidance, and the sealing surfaces are spray-welded with hard alloy, which is resistant to erosion.
The valve body has a high load-bearing capacity, and the channel is straight through. When It is fully opened, it is similar to a straight pipe through the gate orifice, and the flow resistance is small. The valve stem uses composite packing and multiple seals, making the seal reliable and low friction.
When closing the valve, turn the handwheel clockwise to move the gate down to the bottom. Due to the pressure of the medium, the inlet end seal seat is pushed toward the gate to form a larger seal specific pressure, thus forming the first seal . At the same time, the gate is pressed against the seal seat at the outlet end to form the second seal.
Due to the double seal, the parts can be repaired or replaced when the pipe system is working. This is an important feature that our products have priority over others in China and abroad.
When opening the gate, turn the handwheel counter clockwise to move the gate, and the diversion hole and the passage hole are connected. With the gate rises, the through hole gradually increases. When it reaches the limit position, the diversion hole and the channel hole overlap, and then it is fully opened.
Structure of Product
The valve seat adopts an O-ring seal and a floating seat structure that applies pre-tightening force, which makes the inlet and outlet of the flat gate valve two-way sealed; and the opening and closing torque of this structure is only half of that of ordinary valves, which can easily open and close the valve .
When the valve is fully opened, the passage is smooth and straight, the flow resistance coefficient is extremely small, and there is no pressure loss. The pipeline can be cleaned by the hair ball.
The valve adopts a packing structure with self-sealing capability, without frequent adjustments. It is extremely easy to open and close. The gasket has reliable sealing performance. The stuffing box is equipped with an auxiliary sealing grease injection structure. The sealing performance is absolutely reliable and no leakage, which solves the general problem that the most prone to leakage of valve packing.
When the flat gate valve is closed, the high pressure in the inner cavity can be automatically removed to ensure safety.
Fully enclosed structure, good protection performance, it is suitable for all-weather requirements.
The sealing structure of the valve seat is elastic and pre-tightened, and the upstream and downstream sealing seats are sealed at the same time. The valve seat and the seal are always face-to-face sealing.
The valve seat has a self-cleaning function and is not directly washed by air flow during the opening or closing of the valve. The valve seat is made of lubricating, non-wearing materials.
Other parts of the valve can maintain normal operation if the actuator fails. It also can be repaired and replaced without disassemble the valve.
Yoke sleeve: The aluminum bronze yoke sleeve is equipped with needle-shaped thrust bearings to reduce the operating torque.
Stem: thread length up to the bracket, and pin and spot welding, which is stable.
Pressure seal: Simple structure, it is equipped with segmented buckle and silver-plated low carbon steel gasket, which helps to disassemble and achieve the best bonnet seal.
Seat ring: Welded seat ring is perpendicular to the channel, which is easy to maintain.
Actuator: This valve can be equipped with electric, hydraulic or pneumatic actuators. If the diameter is below DN300mm, the valve will be equipped with a manual handwheel; If it is above DN350, then it will be a helical gear operating mechanisms.
Yoke: it is a fully assembled yoke, which has passed the seismic test and is easy to maintain and install the actuator.
Gland: Two-piece r type,it is a self-adjustable gland to avoid being ejected.
Overall rear seat: hard surface, durable.
Disc: The spring-loaded disc can be adjusted by itself, reducing the torque of the actuator.
Integral stop: integrally cast bracket stop device to position the assembled bracket disc, making the valve seat more stable and reliable.
The valve body has two structures: casting and welding
For metal-to-metal sealed valves, there is a grease injection structure on the outside of the valve body. The grease enters the valve sealing surface through the grease injector and valve seat, to keep no leakage.
The valve seat adopts the sealing surface inlaid with PTFE, which has a double seal of PTFE to metal and metal to metal. The PTFE sealing surface can also remove the dirt on the gate.
The gate and valve seat are treated with special technology, spray-welded hard alloy, wear-resistant PTFE, to realize double sealing. It can also be greased to assist the double protection of the seal, the seal is more reliable, and the service life is longer.
The gate of the valve with diversion hole, whether it is fully open or fully closed, is always consistent with the sealing surface, and the sealing surface is protected from direct erosion by the medium, thereby prolonging the service life.\
The gate of the valve with diversion hole, whether it is fully open or fully closed, is always consistent with the sealing surface, and the sealing surface is protected from direct erosion by the medium, thereby prolonging the service life.
The valve is equipped with an indicator rod or observation window to show the opening and closing of the valve.