• The YFL district heating & city gas fully welded ball valve has fully welded body in materials of pipe materials such as ST37.8, P265GH, P235GH etc.
• The YFL large size district heating & city gas fully welded ball valve has full bore and reduced bore design;
• Floating and spring loaded seat;
• Reliable sealing under low pressure;
• Double piston effect and bidirectional seal;
• Bubble tight excellent sealing with PTFE+C seats;
• O-type ring and PTFE+20%C or Flexible graphite as stem seal;
• Floating ball for DN 15-DN 200;
• Trunnion ball for DN 200 and above;
• Low torque value and easy operation;
• Body materials same as pipe materials;
• Underground installation with gas exhaust;
• Fire safe, anti-static and anti-blowout stem design;
• Maintenance-free, no adjustment or lubrication with no running cost.

Product range:

• Size: DN15～DN1400
• Pressure rating: PN10 PN16 PN25 PN40
• End connection: RF RTJ BW
• Ball materials: F304 F316 etc.
• Body materials: ST37.8  P235GH  P265GH etc.
• Seat materials: PTFE+20%C Nylon Peek etc.
• Operation: Bare stem Wrench gear electric pneumatic etc.
• Medium: District heating hot water natural gas coal gas liquefied gas steam etc.

Technical standards:

• Design: API6D
• Face to Face: DIN3202
• BW ends:  EN12627
• Flanged ends: EN1092-1
• Fireproof test: API 607 API 6FA
• Test and inspection: API 598 API 6D
• Pressure and temperature rating: ASME B16.34