Underground full welded ball valve can be directly deep underground ,to avoid hidden danger exists because of setting up the underground valve control room.
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Underground full welded ball valve specification
Pressure class: Class150-300lb，PN 16~50
Diameter range: DN15 ~ DN750 (1/2" ~ 30") 
temperature: -29 ~ 200 degree celsius
Connecting type: welded
applicable medium : gas( LNG/LPG )
Driving means: manual, electric, gear, etc.
Available Material:SS, CS, A105, A216, CF8, CF8M, LCB, LCC  
                ( Selected at request )
Underground Full welded ball valve features
1. Designed for use with gas(LNG/LPG) pipeline network application.
2. One-piece welded body & end-piece connection pipe. (Available end connection dimension to ASTM, KS/JIS, )
3. Maintenance-free, no adjustment or lubrication with low running cost.
4. Pre-loaded seat springs ensure leak-tight at low pressure and reduce valve operational torque.
5. Bubble tight excellent sealing with carbon-reinforced PTFE (Teflon) seats.
6. Double O-rings ensure the stem sealing and can be replaced.
7. Anti blow-out stem according to international standards.