500 Series Standard, Soft Seat Needle Valves

100% helium leak tested to 1 x 10-4 ml/s for guaranteed performance and reliability
6,000 psi pressure rating @ 200 ?F
Replaceable Delrin? seat and straight through porting for bidirectional, high capacity flow and easy roddable cleaning
Blow-out proof stem provides a secondary stem seal in the full open position
FKM o-ring seal and PTFE back-up ring below the stem threads to protect from corrosion and galling; PTFE packing optional (certain NPT sizes only)
All stems are 316 Stainless Steel
All stem threads are rolled for strength and ease of operation
One-piece bonnet with a metal-to-metal seal to the valve body below the bonnet threads
Slotted spring pin to prevent accidental loosening
Vinyl dust cap for bonnet and stem (non-packing)