Description
131081 ST-4 SAFETY VALVE – 250 PSI, 1/2" NPT, CLOSED BODY
PART NUMBER(S):
Fleet Products: 131081 | OE: 131081, KN31526, N1178DF | Automann:
DESCRIPTION:
Model: ST-4 Safety Valve
Vehicles: Universal air brake systems on heavy-duty trucks and trailers
• Valve Type: ST-4 (Non-adjustable Safety Relief)
• Set Pressure: 250 PSI
• Thread Size: 1/2"-14 NPT
• Body Style: Closed, low profile with 2-hole mount
• Length: 1-3/8 in (3.51 cm)
• Weight: 0.15–0.4 lb (0.08–0.18 kg)
• Material: Brass and stainless steel – will not rust or corrode
• Function: Automatically vents excess air pressure above 250 PSI to protect air brake systems
Applications:
Used in truck and trailer air brake systems to prevent over-pressurization. Ideal for air lines where safety relief is required at 250 PSI. Durable construction ensures reliability in high-vibration, high-duty environments.
CROSS-REFERENCE(S):
131081, KN31526, N1178DF, 250PSI, WBW131081
A cross-reference listing means this part should be a suitable replacement for the part numbers listed. Please confirm all dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
✔ 1/2"-14 NPT thread; ensure proper torque and thread sealant use
✔ Mount using designated 2-hole pattern; avoid overtightening
✔ Designed for one-time calibration – do not attempt adjustment
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