Description
KN34070-G – TRACTOR PROTECTION VALVE
PART NUMBER(S):
Fleet Products: KN34070-G
OE: KN34070, KN34070X, N30300
Automann: FSKN34070X
DESCRIPTION:
Model: Tractor Protection Valve (Three-line, no quick release)
Vehicles: Compatible with post-FMVSS 121 tractors using PP-7 or MV-3 dash valves
• Valve Type: Three-line automatic (no quick release)
• Actuation Type: Pneumatic, automatic
• Function: Protects tractor air system during trailer breakaway, controls trailer air supply and service lines
• Tractor Control Port: 3/8" NPT
• Trailer Service Port: 1/2" NPT
• Trailer Emergency Port: 1/2" NPT
• Reservoir Port: 3/8" NPT
• Dash Valve Port: 1/4" NPT
• Operating Temperature: -40°F to +200°F (-40°C to +93°C)
• Opening Pressure (Service Line): ~45 PSI
• Shut-off Pressure: 20 ± 5 PSI
• Mounting: Behind cab or on chassis rail
• Material: Aluminum body with precision-cast internals
• System Integrity: Maintains tractor air protection and prevents loss due to trailer disconnection
• Unique Features:
• No quick-release feature
• Replaces Bendix TP-2, TP-3, TP-3DC, TP-5
• Used with dash-mounted supply valves
• Allows isolation of tractor and trailer air lines during fault condition
Applications:
Used in tractor air brake systems to isolate and protect the tractor’s air supply when the trailer is disconnected or an air line fails. Works in tandem with PP-7 or MV-3 dash valves. Commonly mounted behind the cab and integrated into trailer air supply/service control.
CROSS-REFERENCE(S):
KN34030, KN34070X, N30300, 481587, 77S812, 7B6186, 227661, 227662, 227672, 227801, 227932, 228276, 276160, 276161, 283090, G45431, 180217, 70180217, 18A2146, B9Q2951A, CTYCB18718A, TYCB22525A, XC332865, 10130260, MBW004249, KN34000, KN34040, KN34040A, KN34070N, N20952B, N30033D, N30033G, N30073GC, N30073GD, A15207, SV8047, 20QE19018, 20QE335, 20QE355, 176825R91, 176826R91, 184970, 206200, 211205H1, 218869R91, 3212393R91, 3213493R91, 355439C91, 355439C92, 360423C91, 360423C92, 408431C91, 445177R91, 445177R92, 479191C91, 680502R91, 681698R91, 788990C91, 865755R91, 865755R92, 866748R91, 866784R92, 874727R91, 87427R92, 875691R91, 875691R92, 875891R91, 997072R91, 997072R92, 10080G, 14109F, 14109FX, 7650G, 98005598, 36Z950D1, N30073DA, 138962, 53700, 1017506, 16090, 20014, 767653011486, 25E0645, 323780, 633354, 633418, Y633354, A24316, AC24912-001A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data. Some changes in air line plumbing may be required.
IMPORTANT INSTALLATION NOTES:
✔ Install behind cab on tractor chassis rail
✔ Ensure correct orientation of control and service/emergency ports
✔ Confirm compatibility with PP-7 or MV-3 dash valves
✔ Not to be used in systems requiring quick release
✔ Follow manufacturer plumbing diagram to ensure correct isolation and protection function
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