Part Name Ordinary carbon steel series Stainless steel series Low temperature steel series Anti-sulfur series GB standard NACE standard Body, left body WCB CF8, CF8M, CF3, CF3M LCB, LCC WCB CF8M Sphere F6aWCB+HC r CF8, CF8M, CF3, CF3M LCB, LCC WCB+HCrF6a CF8M Seat PTFE; Sintered carbon fiber; Metal + rubber component; Metal surfacing hard alloy Stem F6a 304.31 6 F6a 31 8 316 Seat bearing ring A105 Zn 304.31 6 A105 Zn A105 Zn 316 Stem packing PTFE; carbon fiber, flexible graphite Stem bearings, thrust bearings Metal lined PTFE; Sintered carbon fiber Packing ring F6a 304.31 6 F6a F6a 316 spring 3Yc-7 Double stud A193-B7 A1 93-B8, B8M A320-L7 A193-B7 A193-B7 Nuts A1 94-2H A194-8 A194-4 A194-2H A194-2H Capping WCBA105 Magnetic Packaging Box,Magnetic Cardboard Box,Packaging Magnetic Box Guangzhou Xinqicai Printing Co., Ltd. , https://www.cnxqcprinting.com
Natural gas ball valve use and design principle
The use of ball valves in natural gas pipelines is usually a fixed-axis ball valve. Its valve seats usually have two designs, namely the self-vented design of the downstream valve seat and the design of the double-piston effect. Both designs have double-cut seals. The role.
When the valve is closed, the line pressure acts on the outer surface of the upstream seat ring, causing the seat ring to abut the ball. If media leaks into the valve chamber from the upstream seat, when the pressure in the valve chamber exceeds the pressure in the downstream line, the downstream seat will disengage the ball and the pressure in the valve chamber will be released downstream of the valve.
A natural gas ball valve with a double-piston design, under normal conditions, the pressure acts on the outside of the end of the seat ring seal. This force forces the seat ring seal toward the valve body so that it is between the seat ring and the valve body. Form a seal.
If the valve seat leaks, the pressure will directly enter the inside of the valve body. This pressure acts on the inner side of the sealing surface of the valve seat sealing ring and tightly presses the upper part of the valve seat sealing ring. At the same time, this force will force the seat ring seal against the valve body, creating an effective seal between the seat ring and the valve body.
Natural gas ball valves have been increasingly used in modern production and life.
Natural gas ball valve manufacturing specifications
Basic design standards: GB12237, JB/T7745, API 6D, BS5351, ASME B16.34.
Flange standards: ANSI B16.5, MSS-SP44, JB/T79-94, GB9112-9113-88, HG20592-20596.
Welding end standards: ANSI B16.25, GB12224-89 or user requirements.
Structure length standards: GB12221, GB12237, JB/T7745, ASME B16.10, BS5351.
Test pressure standard: API598, API 6D, JB/T13927.
Suitable media: water, steam, liquefied petroleum gas, natural gas and corrosive media, etc.
The pressure-temperature rating of the material is in accordance with GB 9131 or ANSI B 16.5a.
Drive mode: manual, pneumatic, electric, worm gear drive and so on. Natural gas ball valve
material
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