Fisher R622 LP-Gas Second-Stage Pressure Regulator Valve 1/2" FNPT
The Fisher R622 Pressure Regulator Valve is a high-precision, second-stage pressure-reducing regulator engineered for domestic, commercial, and light industrial liquefied petroleum gas (LP-Gas) installations.
- 10 psig (0.69 bar) Maximum Allowable Inlet Pressure
- Up to 1,400,000 BTU/hr (LPG vapor) Flow Capacity
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- 1 YearWarranty
Product Overview
The Fisher R622 Pressure Regulator Valve is a high-precision, second-stage pressure-reducing regulator engineered for domestic, commercial, and light industrial liquefied petroleum gas (LP-Gas) installations. Manufactured by Emerson under the Fisher LP-Gas Equipment brand, this regulator is designed to reduce inlet pressure from a first-stage regulator down to appliance working pressure, typically 11 inches water column (28 mbar). Its sensitive molded diaphragm and precision internal lever mechanism maintain stable downstream delivery pressure across varying inlet pressures and varying demand loads.
Equipped with an integrated internal relief valve and a large, high-capacity 3/4-inch NPT screened vent, the Fisher R622 ensures superior overpressure protection by venting excess gas safely to the atmosphere in the event of downstream overpressure. Its rugged fabric-reinforced diaphragm, corrosion-resistant internal components, and durable painted body provide long service life and reliable freeze resistance. The regulator is widely installed in residential propane systems, commercial kitchens, agricultural heating setups, and gas distribution manifolds.
Technical Specifications
| Specification | Value |
| Product Name | LP-Gas Second-Stage Pressure Regulator |
| Manufacturer / Brand | Fisher / Emerson |
| Model Number | R622 (R622-DFF standard configuration) |
| Regulator Type | Second-Stage Pressure-Reducing Regulator |
| Inlet Connection | 1/2 Inch FNPT |
| Outlet Connection | 1/2 Inch FNPT |
| Vent Connection | 3/4 Inch FNPT Screened Vent |
| Maximum Allowable Inlet Pressure | 10 psig (0.69 bar) |
| Standard Outlet Pressure Setting | 11 Inches Water Column (28 mbar) |
| Outlet Pressure Adjustment Range | 9 to 13 Inches Water Column (22 to 32 mbar) |
| Flow Capacity | Up to 1,400,000 BTU/hr (LPG vapor) |
| Internal Relief Valve | Integrated High-Capacity Internal Relief Device |
| Pressure Registration | Internal Sensing |
| Diaphragm Material | Fabric-Reinforced Nitrile Rubber (NBR) |
| Body and Bonnet Material | Cast Aluminium / Precision Machined Alloys |
| Seat Material | Resilient Nitrile Rubber (NBR) Disk |
| Operating Temperature Range | -29°C to +71°C (-20°F to +160°F) |
| Certifications and Listings | UL Listed (Underwriters Laboratories) |
| Approximate Net Weight | 0.82 kg (1.8 lb) |
| Operating Medium | LP-Gas (Propane Vapor), Natural Gas |
| Condition | New |
| Warranty | 1 Year |
Key Features
Precise second-stage pressure reduction from 10 psig down to 11 inches water column appliance pressure
Integrated high-capacity internal relief valve ensures reliable downstream overpressure protection
Large 3/4-inch FNPT screened vent prevents foreign debris and insects from entering the bonnet cavity
Molded fabric-reinforced nitrile diaphragm guarantees sensitive pressure control and fast response
Durable corrosion-resistant construction suitable for demanding outdoor propane installations
Standard 1/2-inch FNPT in-line inlet and outlet connections for convenient pipeline assembly
UL listed construction conforming to rigorous safety standards for LP-gas handling equipment
Internal pressure registration eliminates the requirement for external control sensing lines
Compact profile allows versatile mounting in tight gas service enclosures and tank hoods
Typical Applications
Residential propane heating and domestic gas distribution systems
Commercial cooking appliances, food service ranges, and restaurant equipment
Agricultural crop dryers, poultry brooders, and greenhouse heating systems
Light industrial gas furnaces and LP-gas burner regulation skids
Second-stage pressure control downstream of primary bulk tank regulators
Dual-cylinder manifold installations for propane supply systems
Utility gas distribution and vaporized propane pressure reduction networks
Shipping & Support
Fast dispatch: Australia & Worldwide Shipping
Technical assistance available
1-year warranty
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