We are a leading manufacturer of non return / screw tip valves; utilizing the most advanced technology in both the design and manufacturing process, combined with years of experience
to produce top quality Screw Tip Sets .
• High quality materials
• Coating and treatments
• Unsurpassed workmanship
• Attention to detail
• Providing a product of unsurpassed
value to our customers.
Sanity International manufactures a wide range of valves to meet the needs of today’s injection moulders.
The screw tip valve is one of the key components in the molding process. The ever-widening range of both materials and processes faced by injection moulders, along with the need for increased quality and productivity, makes screw tip valve function Even more of a critical concern.
The feed screw rotation moves and melts material that must then flow through the screw tip valve building up forward pressure that forces the screw the key element in a screw tip valve is the flow volume through the valve. Higher flow volumes are generally referred to as Free Flow Designs; many ball check and some hybrid 3 and 4-piece construction designs offer very limited flow areas. Flow volumes are both a function of mechanical limitations and functionality needs.
Common designs generally have flow volumes that range from 35 to 75% of the cross section of the feed screws exit or meter area. The flow volume of a screw tip valve is determined by the smallest area of volume available in the unit. On standard ring type valves, this back. The accumulated plastic in front of the valve is then injected into the mold, keeping material from escaping back onto the feed screw, which is the function of the screw tip or non-return valve.Poor valve function results in inconsistencies and inefficiency in the molding process. There are many design and process considerations for proper valve function that should be considered.