The Hallite 661 has been designed to cushion the stroke of the piston in pneumatic cylinders by acting as a non-return valve.
Near the end of the cylinder stroke the cushion spear contacts the seal and pushes it against the radial housing wall thereby trapping air and decelerating the piston. When pressure is applied to the system to return the piston, specially designed venting grooves allow pressure to pass over the Hallite 661 to the piston.
The type 661 seal is manufactured in Hallite’s Hythane 181 high specification polyurethane compound to provide a hard wearing material which is easily installed in the groove.
• Non-return valve action
• Easy installation
• Hard wearing
• Excellent temperature range