600 Series - Block & Bleed, Hard Seat Needle Valves Brochure

Block & bleed design allows pressure to be bled off without disturbing the permanent piping installation, allowing quick and easy removal or replacement of instruments. 100% helium leak tested to 1 x 10-4 ml/s for guaranteed performance and reliability. 10,000 psi pressure rating @ 200 °F. 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 or Grafoil® packing optional. 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). 0.090` bleed hole located on the bottom is controlled by a 1/4`-20 UNF-2A bleed screw.