Advanced Specialty Gas Equipment

Model CRH
Type 316 Stainless Steel, Positive Seal, (Tied Seat), High Flow Regulators

Corrosive, High-Flow Regulator Model CRHThe special internal design makes these corrosive-resistant regulators extremely reliable for use with so-called "dirty gases such as Hydrogen Chloride, Sulfur Dioxide or Chlorine. It features a large seat and attached poppet (tied seat) design which reduces its susceptibility to clogging from particulate matter. In the unlikely event that a seat leak occurs from contamination or other sources, the regulator provides for positive shut-off by pulling the poppet tighter against the seat as pressure rises. The large Cv factor on this regulator also makes it an excellent choice for corrosive gas applications requiring high flow rates.

Standard Features
  • Type 316 Stainless Steel Bar Stock Construction provides maximum corrosion resistance.
  • High Purity Design assures maximum diffusion resistance and permits vacuum purging of regulator.
  • Tied Seat (tied diaphragm) ensures positive shutoff if particulate matter should lodge in the seat, a common problem with corrosive gases.
  • Diaphragm Seal Outlet Valve maintains gas purity.
  • Unique Regulator Design allows regulator to be used at very low inlet pressures.
  • 21?2" Stainless Steel Gauges read easily for more precise settings.
  • Threaded Holes in Rear of Regulator permit front panel mounting.
Optional Features
  • Bonnet Vent Connector provides a 1?8" NPT female port allowing bonnet to be connected to a vent line or disposal system as a precaution in the unlikely event of a diaphragm failure.
  • Packed 316 SS Needle Valve in place of standard diaphragm seal valve, provides flow control at an economical price.
  • Internal (Inboard) Helium Leak Test and Test Report determines inboard leak rate; test report certifies leak rate of less than 2 x 10-8 sccsair equivalent.
  • External (Outboard) Helium Leak Test and Test Report determines leak rate of gas from regulator to atmosphere; test report certifies leak rate of less than 5 x 10-8 sccs air equivalent.
Maximum Inlet Pressure

Inlet Pressure Gauge

Delivery Pressure Range

Delivery Pressure Gauge

Gauge Size: 21?2" Dial

Flow Coefficient:
  Regulator: Cv = 0.624
  Outlet Valve: Cv = 0.17

Inlet Connection: CGA 290, 330, 350,
510, 660 or 705 as ordered

Outlet Connection:   1?4" NPT female

Supply Pressure Effect:
  1 psi per 100 psi(approximate)

Approximate Weight: 7 lbs

Materials of Construction
Body: Type 316 Stainless Steel Bar Stock
Outlet Valve and Gauges:
   Type 316 Stainless Steel
Bonnet: Nickel-Chrome Plated Brass
Other Metal Parts Exposed to Gas:
   Type 316 Stainless Steel
Seats (Regulator and Outlet Valve): PCTFE
Diaphragm: Type 316 Stainless Steel
Seals: PTFE

Optional Equipment

Equipment Part No.
Bonnet Vent Connector* SG5647V
Inboard Helium Leak Test and Test Report HT1000
Outboard Helium Leak Test and Test Report HT1001
Outlet Fittings* (male connectors)  
  1?4" NPT male x 1?8" compression SG6713
  1?4" NPT male x 1?4" compression SG6714
Check Valves*  
Safety Mounting Brackets*  
Packed Needle Valve  
Purge Assemblies* (cross purge assemblies are recommended)
* If selected, these items are not installed on the regulator. They are shipped as separate items.

Table I

Part No. Inlet Pressure (psig)   Delivery Pressure (psig)
Maximum Gauge   Range Gauge
CRH-3-75-(CGA) 3000 0-4000   3-75 0-100
CRH-3-150-(CGA) 3000 0-4000   10-150 0-200
CRH-2-75-(CGA) 800 0-1000   3-75 0-100
CRH-2-150-(CGA) 800 0-1000   10-150 0-200
CRH-1-75-(CGA) 300 0-400   3-75 0-100
CRH-1-150-(CGA) 300 0-400   10-150 0-200
Where "(CGA)" is indicated above, insert appropriate Compressed Gas Association connection number to complete the part number. Example: CRH-3-75-330. Order by complete part number.
To order regulator with optional packed needle valve, suffix regulator part number with PV. Example CRH-3-75-330-PV.
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