Dual Valve (DFV)
Free Flow Valve (DFFV)
Slimline Free flow Valve(DSFFV)
Dashley Double Ball Check Valve (DDV)
Double Non Return Valve (DDNRV)
Slurry Air Release Valve (DSARV)
Rotary Disc Valve (DRDV)
Slurry Knife Gate Valve (DSKG)
Wafer Slurry Knife Gate Valve (DWSKG)
Pump Protection Valve (DPPV)
Flo-Stop High Pressure Mine Dewatering Check Valve(DFSV)
High pressure slurry knife gate valve (DHPSKG)
Urethane lined slurry knife gate valve (DULSKG)
Compact flanged ported gate valve (DCFPG)
Dual slide gate valve (DSGV)
Straight Through Pinch Valve (DSTPV)
Pinch Valve Enclosed Body Type (DPVE)

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Slimline Free flow Valve(DSFFV)

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DUAL‘s Slimline Valve’s heart is a reinforced urethane or rubber ball. The unique design of the valve allows free movement of the ball. The ball lifts completely out of the flow when the pump starts and allows free flow of liquid without any interference. As the pump stops, the ball falls and positively locates in the seat due to its own weight and back pressure of the liquid. This results in dropless sealing.


  • Perfect sealing.
  • Low head losses.
  • Non clogging, self cleaning ball.
  • Minimum back pressure for tightness: 0.3 to 0.5bar
  • Removable bonnet for cleaning or replacing of ball.
  • Maintenance free.
  • Full bore.
  • Silent, non-slam, reduces pipe hammer.
  • Fabricated valves face-to-face can be altered to suit different types of valve face-to-face dimensions.
  • Simple construction - one moving part.

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