The Snuff Back valve is a single acting pneumatic valve designed to dispense medium to high viscosity material. The working principal of this valve is that the retraction of the piston generates "Negative Pressure" that allows the “Pull Back” of material to achieve a quick cut off and or prevent dripping of material. A snuff-back effect is created as the piston rod retract, this effect causing the material in the dispensing needle to be sucked back into the valve body. The snuff-back effect helps to prevent material from dripping when the valve is not dispensing.
The Snuff Back Valve is suitable for dispensing applications such as gasketing that need to have a clean cut-offs and faster shut-off control. This valve is also suitable for large volume dispensing for high viscous material in dispensing applications such as potting, filling or encapsulation. The unique balance spool design allows the valve to operate with very high material pressure conditions without any problem.