Advanced Specialty Gas Equipment

Brass Two-Stage Regulator Model TSD
Model TSD

General Purpose, Two-Stage Regulators

General purpose two-stage regulators are designed for use with noncorrosive gases or gas mixtures. They are recommended for general laboratory use where high purity is not a consideration, and where constant delivery pressure is desired.


Standard FeaturesBrass Two-Stage Regulator Model TSD with Flowmeter
  • Two-Stage Regulator Design ensures constant delivery pressure over varying inlet pressures.
  • Filter in Each Seat Assembly traps foreign matter, extends regulator life
    and reduces maintenance.
  • Neoprene Diaphragm in Second Stage permits accurate delivery
    pressure settings.
  • Outlet metering valve provides flow control.
Optional Features
  • Relief Valve protects regulator components from the effects of overpressurization.
Maximum Inlet Pressure: 3000 psig

Inlet Pressure Gauge (dual scale):
  0–4000 psig/0–275 bar

Delivery Pressure Range

Delivery Pressure Gauge

Gauge Size: 2" Dial

Operating Temperature Range:
  Regulators with Flowmeters:
     32°F to 165°F
  Regulators without Flowmeters:
     -40°F to 165°F

Flow Coefficient:
  Regulator: Cv = 0.15
  Outlet Valve: Cv = 0.4

Inlet Connection: CGA 296, 320, 326, 346,
350, 540, 580, 590 or 660 as ordered

Outlet Connection:
  1/4" NPT male (on outlet valve)
  1/8" NPT female (on flowmeter)

Optional Relief Valve Vent Connection:
  1/4" NPT male

Supply Pressure Effect: 0.04 psi per 100 psi

Approximate Weight: 5 lbs

Materials of Construction
Body: Brass Forging
Outlet Valve and Gauges: Brass
Bonnet: Painted Zinc
Other Metal Parts Exposed to Gas:
  Brass and Stainless Steel
Seat and Seals: PTFE
Diaphragm: Neoprene
Flowmeter: Series 50 Flowmeter, Model FM4350

Optional Equipment

Equipment Part No.
Relief Valves:  
for TSD-15 RV5572-25i
for TSD-50 and TSD-750 Series RV5572-60i
for TSD-125 RV5572-140i
for TSD-250 RV5572-300i

Table I, Regulators with Metering Valves

  Delivery Pressure
Part No
Model SSD
(dual scale)
TSD-15-(CGA) 2–15 0–30 0–2
TSD-50-(CGA) 4–50 0–60 0–4
TSD-125-(CGA) 10–125 0–150 0–10
TSD-250-(CGA) 20–250 0–400 0–27

Table II, Regulators with Flowmeters

All regulators with flowmeters have a delivery pressure range of 4–50 psig and are
equipped with 0–100 psig pressure gauge on the delivery side.

Part No.
Model SSD
Flowmeter Range,
Air at 70°F and 14.7 psia
TSD-750-(CGA) 8–50 sccm
TSD-751-(CGA) 5–85 sccm
TSD-752-(CGA) 40–440 sccm
TSD-753-(CGA) 100–950 sccm
TSD-754-(CGA) 0.2–1.8 slpm
TSD-755-(CGA) 0.4–3.6 slpm
TSD-756-(CGA) 0.5–7.0 slpm
TSD-757-(CGA) 1–13 slpm
TSD-758-(CGA) 6–24 slpm
TSD-759-(CGA) 4–44 slpm
Where “(CGA)” is indicated in Tables I and II, insert appropriate Compressed Gas Association connection
number to complete the part number. Example: TSD-15-580 or TSD-750-580. Order by complete number.