The Red Dot 71R8450 Bulbless Block Type Expansion Valve is a high-capacity (2-ton) TXV designed for mobile HVAC systems that require increased refrigerant flow and service access. The integrated Schrader service port allows technicians to check pressures without disconnecting lines, improving serviceability while keeping the system sealed.
This valve is commonly used on Kenworth C500, T270–T470, and W900 applications. With female O-ring connections, an 8°F superheat rating, and a 53.5 psig pressure limit at 75°F, the 71R8450 delivers stable, quiet refrigerant control in demanding on-highway environments.
Use the specifications and interchange numbers below to confirm the correct match before ordering.
On-Road Applications
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Kenworth:
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C500
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T270–T470
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W900
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Product Specifications
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Part Type: A/C Expansion Valve
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Valve Style: Bulbless Block Type
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Special Feature: Integrated Schrader service port
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Rated Capacity: 2 Ton (Hi-Cap)
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Red Dot Part No.: 71R8450
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Red Dot Factory No.: RD-5-9935-0P
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Superheat Rating: 8°F
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Pressure Limit: 53.5 psig @ 75°F
Connections:
Hose Side
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Inlet: #6 (3/8 in.) Female O-Ring
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Outlet: #10 (5/8 in.) Female O-Ring
Evaporator Side
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Inlet: #8 (1/2 in.) Female O-Ring
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Outlet: #10 (5/8 in.) Female O-Ring
OEM & Interchange Numbers
OEM Numbers:
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Caterpillar: 232-8571
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Freightliner: RDH RD5 9935 0
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Mack: 4379-RD99350P
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Volvo: RDHRD599350P
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Western Star: RDH RD5 9935 0
Aftermarket / Interchange:
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Texas Truck AC: 450-6504, 450-6504A
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AirSource / MEI: 1627
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Alliance: ABP N83 308251
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Bergstrom: 540446
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Climatech: EA1500
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CoolStar / MEI: 520-1055
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Omega: 31-30981
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Primatech: PTAC1627
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Truck Air / MEI: 12-1605A
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TruckAC+: T3507
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TTA/C: 16-7005
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Red Dot Aftermarket: 71R8450
Additional Interchange References:
1627, 232-8571, 4379-RD599350, 4379-RD599350P, 4379-RD99350P, EV01055, RDHRD599350P, RDT71R8450
(Always verify Schrader port requirement, tonnage, and O-ring sizes prior to installation.)
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