Bellows Stem Seals, Control Valve

Bellows stem seals eliminate fugitive emissions by surrounding the valve stem with a pressure-tight barrier, isolating the stem from the process fluid and preventing leakage to the atmosphere. For an extra measure of protection, the bellows stem seal option provides a back-up seal of Teflon, braided or Graphite/Grafoil packing.

  • Pilot plant installations
  • Test stands
  • R & D facilities
  • Processing plants
  • Hazardous service
  • Fugitive emissions


  • Aviation & aerospace
  • Chemical, refining & petrochemical
  • Oil & gas
  • Process or industrial
  • Test equipment & services
Features & Benefits
  • Barstock, not cast, construction to avoid potential  porosity issues
  • Available in Kynar, PVC and CPVC
  • Full compliance with most stringent requirements of the Clean Air Act
  • Secondary packing chamber with a bellows leak monitoring port for additional security
  • Two-piece stem allows stem adjustment without breaking the bellows bonnet extension seal

Seat Type: Globe or Angle – Class III, IV or VI

Sizes: 1/2″ – 1-1/4″ (DN15 – DN32)

End Connections: NPT, BSPT, Raised-face Flanges (ANSI, DIN, JIS), Ring Type Joint Flanges, Socket Weld, Bolt-thru Flanged

Body Materials: Carbon Steel, Stainless Steel, Brass, Monel, Hastelloy B & C, Alloy 20, Kynar, PVC

Cv (Kv): 0.05 to 7.1 (0,04 to 6,2)

Ranges: 3-15 or 6-30 psi; split ranges are available with optional positioner


CRN Number

Get A Quote

Related Products

8000 Series

Heavy Duty Control Valve

8000CR Series

Cryogenic, Control Valve

8000T Series

Three Way Control Valve

Quick Quote

Know what you need and want a quote quickly? We can help! Fill out this form and we will get back to you shortly.