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
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
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Bottle
WATER CUP IS USUALLY A CONTAINER FOR PEOPLE
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