Skip to content
Home Products Specialty Gas Equipment Regulators WA 721

WA 721

High Purity - Brass Barstock Regulator

Model WA721 is a single stage cylinder regulator available in brass (WA721) or chrome plated brass (WA721C) barstock for pressure control of non corrosive gases when pressure rise is not critical. The WA721 is suitable for:

  • High purity gas applications
  • Research sample systems gases
  • Process analyzer gases
  • Gas chromatography
  • EPA protocol gases
  • Laser gas systems
  • Emission monitoring systems

Recommended for gas purity levels of Grade 5.0 (99.999) and higher.

Materials

Body/Bonnet Brass Barstock
Diaphragm 316L Stainless Steel
Nozzle Brass
Seat PTFE Teflon
Seals PTFE Teflon
Filter Nickel-Plated Sintered Bronze - 10 Micron
Seat Return Spring PH17-7 Stainless Steel
Adjusting Knob ABS Plastic

Features

  • 1-11/16″ 316L stainless steel diaphragm eliminates contamination from diffusion or outgassing
  • One piece encapsulated seat design includes a sintered filter to protect the seat from particulate contamination
  • 2″ dual scale brass gauges (psi/bar)
  • Designed to 1 x 10-9 cc/sec. inboard helium leak rate to maintain gas purity levels
  • Front and rear panel mountable
  • Maximum inlet 3000 PSIG except for models with CGA 300 and 510 equipped with 400 PSIG inlet gauge
  • External relief valve standard

WA 721 Ordering Information

WA 771
Model No.
  • WA 771
  • WA 771C (chrome plated)
XXX
Delivery Pressure
Delivery (Outlet Gauge)
  • 0-15 PSIG (30” Hg Vac-30 psi/2 bar)
  • 0-15 PSIG (30” Hg Vac-30 psi/2 bar)
  • 0-125 PSIG (30” Hg Vac-200 psi/14 bar)
  • 0-250 PSIG (400 psi/28 bar)
  • 0-500 PSIG (1000 psi/70 bar)
XXX
CGA / Inlet Fitting
  • 000 (1/4” FNPT) 350
  • 001 (1/4” MNPT) 510
  • 300 540
  • 320 580
  • 326 590
  • 346
XXXX
Accessories
  • A) 1/4" MNPT Needle Valve
  • B) 1/4" FNPT Diaph. Valve
  • C) 1/4" MNPT Nipple
  • D) 1/4" FNPT Port
  • E) 1/4" Tube Fitting
  • F) 1/8" Tube Fitting
  • G) Single Regulator Alarm
  • R) SG 910 EZ BR Regulator Mounting Station
XXXX
Options
  • 1. Without Relief Valve
  • 2. He Leak Cert. (Inboard)
  • 3. No Gauges
  • 5. He Leak Cert. (Outboard)
  • 6. 400 PSI Inlet Gauge

Flow Data

Specifications

  • Cv: .08
  • Pressure Regulation: 1.8 PSIG/100PSIG
  • PSIG
  • Weight: 2.92 lbs.

Dimensions

GET STARTED

Let's get to work.

Complete the form and one of WestAir’s gas experts will reach out to you to discuss your specific regulator needs.