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71 Underground Full Welded Ball Valve

Underground Full Welded Ball Valve

Design and manufacturing: GB/T 12237
The structural length:GB/T 12221
Connection forms:JB / T 79.1
Inspection and test:GB / T 26480
Caliber: 1/2″ ~ 48″ (DN15 ~ DN1200)
Pressure temporature level:GB / T 9131
Drive mode:Worm Gear
Pressure: PN1.6 MPa ~ PN42.0 MPa Class 150 ~ Class 2500

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Product Overview

Full welded ball valve is a fully sealed, maintenance-free valve designed for long-term, leak-proof isolation in pipelines. With a welded body construction, it eliminates flange and gasket leakage, making it ideal for gas transmission, district heating, oil & gas, and buried installations where safety, durability, and zero external leakage are critical.

Product Features

  • Fully welded body design ensures zero external leakage for underground service
  • Maintenance-free structure ideal for buried and hard-to-access installations
  • High-pressure and temperature resistance for long-term pipeline operation
  • Excellent sealing performance with resilient or metal seats
  • Compact, robust construction withstands soil load and external stress
  • Low operating torque enables smooth manual or actuator operation
  • Corrosion-resistant coatings suitable for direct burial environments

Specification Parameters

Material for Main Part:

No.NameMaterialNo.NameMaterial
1CapASTM A10521Thrust bearingsPTFE
2BodyASTM A10522Slide bearings304 + PTFE
3SphereASTM A105 + ENP23Support seatASTM A105
4Anti-static springAssembly24O-ringVITON
5Thrust bearingsPTFE25O-ringVITON
6Slide bearings304 + PTFE26Y-ringVITON
7Lower stemASTM A10527Fire padSS304 + Graphite
8Bottom coverASTM A10528FillerGraphite
9Drain valveASTM A105 + ENP29Socket head cap screwsASTM A193 B7
10O-ringVITON30Socket head cap screwsASTM A193 B7
11Fire padSS304 + Graphite31Valve stemASTM A182 F6a
12Socket head cap screwsASTM A193 B732Cylindrical pin35
13FootstepsA333StudsASTM A193 B7
14SeatPPL34NutASTM A194 2H
15Seat fire padSS304 + Graphite35Spring washer65Mn
16Spring support seatASTM A10536LandASTM A105
17Spring17-7PH37Flat key45
18O-ringVITON38TurbineASTM A105-HZn
19Seat support ringASTM A105 + ENP39Vent valveASTM A105-HZn
20Slide bearings304

Underground Full Welded Ball Valve Diagram

Main Overall Dimension: (mm)

DNL (RF)L (WE)D1D2H1H2W
150403457219273246193280
200502521273351285238320
250568560325426323278320
300648635377508365315400
350762762426580410370400
400838838480675457425450
450914914530740495465450
500991991630805540495500
60011431143735975640580500
700134613468301130715660500
800152415249301270785730500
9001727172710361425860820800
10001900184012361625970920800

Specification Applications

  • Underground natural gas pipelines for safe, leak-free isolation
  • Direct-buried district heating systems with zero external maintenance
  • Oil & gas transmission and distribution lines in harsh soil conditions
  • Municipal water supply networks requiring long service life
  • Urban utility corridors where space and access are limited
  • Remote pipeline installations demanding fully sealed, high-reliability valves
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