Metal Seat Expanding Gate Valve

Vatac Metal Seat Expanding Gate Valves are designed and manufactured API 6D, the gate is under closing status, and the seat surface Metal Sealing Ring forms an initial sealing, when the gate valve is on/off every time, the seat ring can clean the both sides of gate. Enforcing all line pressure onto the through conduit gate valve, the pressure acted onto the gate, forcing it against Seat Ring of Outlet Seat. Compressing it until the gate is stopped onto the steel seat to form a double sealing: the first sealing is PTFE to Metal, the second sealing is metal to metal, meanwhile, the seat is also firmly forced into its recess. The O-ring prevents any downstream flow at this point. Inlet sealing is formed after the cavity pressure is released; pipeline pressure is acted onto the inlet seat making it move toward to the gate which forms the Metal sealing. 

Vatac Metal Seat Expanding Gate Valves are with main Features as below:

» Size Ranges: 2” through 48” 

» Pressure Ratings: ANSI #150 to 2500

» Standards compliance: API 6D, API 6A or equivalents

» Materials: Cast Carbon Steel, Cast Stainless Steel, Cast Duplex or Other Specials 

» Ends Connections: Flanged(FF, RF, RTJ) to international standards 

» OS&Y, Outside Stem and Yoke

» Metal-sealed( 13Cr, STL, 316, 304 and etc.)

» Optional Locking Device or Stem Extension

» Optional Direct Mounting to ISO 5211

» Full Port