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Pair of brass reverse flow check valves for torch mounting, 9/16-18 connections, CGA 022 and 023 inlets, UL listed

Miller-Smith Equipment

Miller-Smith Equipment H697 Reverse Flow Check Valve Set, Welding

SKU CH-62F4-VMRQV

Prevents reverse gas flow on welding torches with 9/16-18 connections, UL-listed brass body

  • TypeWelding Parts & Supplies
  • UL Listed safety standard protects operators
  • Brass body resists corrosion for long service life
  • Torch-mount design places valves at the point of use
  • Dual CGA 022 and CGA 023 inlets accept both oxygen and fuel gases
  • 9/16 in.-18 hose fittings connect directly to standard B-size hoses

Torch-Mounted Check Valve Set

The Miller-Smith Equipment H697 set installs directly on the torch to prevent reverse gas flow during welding and cutting. It accepts both fuel and oxygen supplies through standard B-size hose fittings. The brass body resists corrosion in shop environments. This set suits fabricators who need torch-end flashback protection.

Connection Limits And Gas Compatibility

Inlet and outlet ports share a 9/16-18 thread size with opposing hand directions for fuel and oxygen. Fuel gas connects via CGA 023 while oxygen uses CGA 022, so hoses cannot be cross-connected. The valves are rated for fuel and oxygen only; other gases are not supported. Installers must match thread direction to the gas service.

Brass Construction And Daily Handling

The brass body withstands repeated torch changes and exposure to heat, spatter and cleaning solvents. UL listing confirms the set meets recognised safety requirements for this component class. Left-hand and right-hand threads provide a tactile safeguard against accidental reversal during setup. The compact valve housing adds minimal bulk to the torch handle.

Highlights

  • UL Listed safety standard protects operators
  • Brass body resists corrosion for long service life
  • Torch-mount design places valves at the point of use
  • Dual CGA 022 and CGA 023 inlets accept both oxygen and fuel gases
  • 9/16 in.-18 hose fittings connect directly to standard B-size hoses

Specifications

BrandSMITH EQUIPMENT
TypeWelding Parts & Supplies

Questions about this item

Which connection size fits my torch hose?

Both inlet and outlet use 9/16 in. -18 fittings, matching B-size hose connections for fuel and oxygen lines.

What does the UL listing mean for daily welding use?

The set meets UL safety requirements for reverse-flow protection, helping prevent dangerous gas mixing at the torch.

How do the CGA 022 and CGA 023 inlets work with my regulators?

CGA 022 connects to oxygen regulators with right-hand threads, while CGA 023 connects to fuel regulators with left-hand threads.

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