Product Announcement from Nor-Cal Products, Inc.


Poppet Valves-Image

Nor-Cal's poppet valves are fully opening for high conductance and to prevent bellows and poppet contamination in semiconductor applications. Bodies are die-formed from 304 stainless steel to eliminate sharp inside corners and improve conductance. The valves are electropolished for faster pumpdown, lower outgassing and better corrosion resistance. The welded bellows are made from AM-350 stainless steel to provide corrosion resistance and excellent flexibility. They are designed with additional segments to provide extended life. Nor-Cal valves can be operated in any position and actuators can be removed quickly for routine inspection without disassembling the system.

Nor-Cal's poppet valves are available in most port configurations from .38 to 4.0 inch ODs with CF, NW, ISO or ASA flanges. Angle, Angle-In-Line, In-Line, Tee and Straight- Through valves through 3 inch OD's are all available with manual or pneumatic actuators and Viton® or copper seal bonnets. Sizes 4.0 inches and larger are available with pneumatic actuators only.

Poppet Valve General Specifications

  • Electropolished 304 stainless steel die-formed body
  • 15 micron filter on air cylinder exhaust
  • Full opening
  • Viton® poppet O-ring, standard
  • .38 to 4.0 inch port ODs
  • Helium leak rate 10-9 std. cc./sec. or less
  • Viton® Seal Bonnet:
    • 10-9 Torr vacuum rating,
    • Bakeable to 204°C intermittent
    • CF, NW, ISO and ASA flanges
  • Copper Seal Bonnet:
    • 10-10 Torr vacuum rating, CF flanges
    • Bakeable to 204°C intermittent
  • Pneumatically Operated: Normally closed, 60 to 80 psig operating air pressure
  • Maximum differential pressure 20 psi across valve seat
  • External differential pressures greater than 5 psi on the bellows may result in premature bellows failure
 
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