The main components are forged. Forged steel gate valves have three types of middle cavity seals: bolted bonnet, welded bonnet, and middle cavity pressure self-tightening seal structure.
A bolted bonnet means that the valve body and bonnet are connected with bolts and nuts and sealed with a wound gasket (made of stainless steel wire clips and flexible graphite). Metal ring connection can also be used when customers have special requirements.
Welded bonnet means that the valve body and bonnet are connected with threads and fully welded. The fully welded connection can also be used when customers have special requirements.
The middle cavity of 900LB, 1500LB, and 2500LB adopts a pressure self-tightening seal structure. The sealing performance increases with the increase of internal pressure and has high reliability.
The channel is smooth, and the flow coefficient is small. The sealing surface is less eroded and eroded by the medium.
The sealing surface is made of alloy steel or hard alloy, which has good wear resistance and abrasion resistance.
Flexible graphite filler is used, the sealing is reliable, and the operation is light and flexible.
The flow direction of the medium is not restricted; there is no disturbance, and the pressure is not reduced.
The packing replacement and maintenance can be carried out in the state of online shutdown, which is convenient and fast without affecting the operation of the system.
The shape is simple, the structure length is short, the manufacturing process is good, and the application range is wide.
Main material: carbon steel, stainless steel, Taiwan gold steel
Nominal diameter: NPS1/4″~NPS3″ DN6~DN80
Pressure range: CL150 ~ CL2500 PN10~ PN420
Working temperature: -196°C~ +600°C
Operator: Manual
Application range: tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electricity, metallurgy, energy system, etc.
◎ Design Standard: API 602、BS5352
◎ Pressure Temperature Rate: ASME B16.34,GB/T12224
◎ Face to Face: ASME B16.10,GB/T12221
The length of the riveted structure at the threaded end of the socket-welding connection shall comply with the factory standards.
◎ Connection standards：ASME B16.11、ASME B1.20.1、ASME B16.5、ASME B16.25
◎ Fire Safe: API6D
◎ Pressure test: API 602，API 598，BS5146
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