GLT Check Valves are available in 2 types : Swing Check Valves and Wafer Check Valves available in a range of sizes and pressures. Check Valves are single-direction flow valves used to allow unlimited flow in one direction and to restrain flow in the opposite direction. Check Valves are normally designed for installation in horizontal lines but may also be used in vertical lines where the flow is upward under the disc.
   
  GLT Swing Check Valves
 
Application & Function
Swing check valves are straight through flow valves which work automaticallly. The disc swings from the seat upon exertion of fluid pressure on the upstream side. When the direction flow reserves, the reversal pressure and the weight of the disc close the disc against the seat, stopping backflow. This design allows the valves to remain closed even with no flow going through the valves.
 
 
     
 
Construction:
Cast steel swing check valve, bolted cover, horizontal or vertical lines, designed according to API-600.

Dimensions:
 General Design  API 6D
 Face to Face  ANSI B16.10
 Flange Type  ANSI B16.5
 Rating  Class 150, 300, 600  & 900
 Sizes  2" through 20"

Standard Materials:
 Body / Cap  A216-WCB
 Disc  A216-WCB + 13Cr
 Seat Ring  A105 + 13Cr
 Arm  A216-WCB

         
  GLT Wafer Check Valves
         
 
Application & Function
Wafer check valves or sometimes called dual plate check valves has the same applications as swing check valves but with added advantageous. The design is lighter and more compact and lighter than a swing check valves, making it easier to install and lead to lower cost overall.
         
 
Construction:
Cast steel wafer check valve, one piece body, independent dual plate action, designed according to API-594.

Dimensions:
 General Design  API 594
 Face to Face  ANSI B16.10
 Flange Type  ANSI B16.5
 Rating  Class 150, 300 & 600
 Sizes  2" through 16"

Standard Materials:
 Body / Cap  A216-WCB
 Disc Plate  13Cr
 Seat  Buna N
 Spring  A276-304
 Hinge & Stop Pin  A276-304
     
  GLT Valves produces a wide variety of types, classes and materials of check valves. Please visit our download catalogue page to download the latest GLT Valves product catalogue or please contact us if you require further information.