Diaphragm Valves

Diaphragm Valves
DV86 Series


• Suitable for ultra high purity applications

• Both manual and pneumatic actuation are available

• End connections: Face seal fittings (FSR) and butt welded

• Internal spring-less design and metal-to-metal seal minimizes particle generation and ensures "purity integrity" in the flow passages

• Cleaned and degreased for oxygen service according to CGA G-4.1 and ASTM G93 Class C, respectively 

• Long service life

• 100% Helium leak tested


* Standard Material

** Vespal® seat is recommended for Nitrous Oxide (N2O) service but is not available for low pressure pneumatic actuation.



Body MaterialModelActuationWorking PressureInlet/OutletValve SeatOptionsOption
SL: 316LDV86M: ManualH: 3500 psiVM4, VM8K: PCTFENone: 15 µinIS: Electronic indicator (for 3500 psi pneumatic only)
  P: PneumaticL: 300 psiVSM4, VSM8V: Vespel®E: 7 µin (EP)NO: Normally open (for 300 psi pneumatic only)
  (Normally closed) VSF4, VSF8   
    TW4, TW6, TW8   

Inlet & Outlet Connections


4 = 1/4"

6 = 3/8"

8 = 1/2"

VM: Face seal male (FSR fittings)4, 8
VSM: Face seal swivel male (FSR fittings)4, 8
VSF: Face seal swivel female (FSR fittings)4, 8
TW: Butt welded4, 6, 8


• Maximum operating pressure: 300 psi (20 bar), 3500 psi (240 bar)

• Temperature range: -40˚F~150˚F (-40˚C~ 65˚C)

•  Cv: 0.3


• Body: 316L stainless steel

• Seat: PCTFE*, Vespel®**

• Diaphragm: Elgiloy®


• Standard Ra: 15 µin (BA); Optional: 7 µin (EP)