ST-4 Series

• round handle manual
• pressure rating: 3500 psig
• flow coefficient: cv =.26
• seat orifice size: .125 diameter
• standard seat material: pctfe
• temperature limits PCTFE seat: -65f to 150f
• temperature limits optional polyimide seat: -65f to 250f
• max allowable seat leakage: 2 x 10-8 atm cc/sec he
• max inboard leakage: 2 x 10-8 atm cc/sec he
• wetted diaphragm: 316l sst
• standard bottom mount: 2 x #10-32 tapped holes on a 1” bolt circle

• spring type design
• standard forged body pipe threaded designs (available with pm option)
• standard bar stock body for non-pipe threaded designs (bottom mount standard, available with pm option)
• positive shut-off
• cleaned for oxygen service
• 100% helium leak tested

• electropolished id surface available on request
• custom materials and configurations available on request

Seat Material:

• pctfe
• polymide

End Connections:

• 1/4” male and 1/4” female pipe thread
• 1/4“ compression
• 1/4 male and 1/4 female face seal
• 1/4” and 3/8” orbital tube weld
• custom connections

• brass
• nickel plated brass
• 316l stainless steel