71R8310 Red Dot Bulbless Block Type Expansion Valve – Threaded Mounting Holes

The Red Dot 71R8310 Bulbless Block Type Expansion Valve is a compact, bulbless TXV designed for mobile HVAC systems that use a block-style mounting configuration. Bulbless expansion valves regulate refrigerant flow internally, eliminating the need for an external sensing bulb and allowing for a more rugged, simplified installation in demanding environments.

This model features threaded mounting holes and is specifically designed for Red Dot units R-9-800, R-9-800-0, R-9-800-0-24, and R-10004-0. It is also used in Caterpillar 325 excavator applications, where space constraints and vibration resistance are critical.

With a 5°F superheat rating and defined pressure limits, the 71R8310 provides stable evaporator performance in heavy-duty, off-highway, and on-highway HVAC systems.

Use the specifications and interchange numbers below to confirm the correct match before ordering.

Product Specifications

• Part Type: A/C Expansion Valve

• Valve Style: Bulbless Block Type

• Red Dot Part No.: 71R8310

• Red Dot Factory No.: RD-3-7822-0P

• Mounting Style: Block type with threaded mounting holes

• Superheat Rating: 5°F

• Pressure Limit: 80 psig @ 40°F

Connections:

Hose Side

• Inlet: #6 (3/8 in.) Female O-Ring

• Outlet: #10 (5/8 in.) Female O-Ring

Evaporator Side

• Inlet: #8 (1/2 in.) Female O-Ring

• Outlet: #8 (1/2 in.) Female O-Ring

• Application:

  • Red Dot units R-9-800, R-9-800-0, R-9-800-0-24, R-10004-0

  • Caterpillar 325 Excavator

OEM & Interchange Numbers

OEM / Factory References:

• Red Dot Factory: RD-3-7822-0P

• Freightliner: RDH RD3 7822 0

• Mack: 4379-RD378220

• PACCAR: RD3-7822-0

• Volvo: RDHRD378220P

Aftermarket / Interchange:

• Texas Truck AC: 450-6508

• Climatech: EA1305

• Truck Air / MEI: 12-3024A

• TruckAC+: T3510

• TTA/C: 16-7008

• Red Dot Aftermarket: 71R8310

Additional Interchange References:
1-9276, 12-2613A, 1555129, 232-8557, 38886, 38901, 432-2923, 4379-RD378220P, EA13050, RDHRD378220P, RDT71R8310

(Always verify block configuration, O-ring sizes, and mounting requirements prior to installation.)