SUCTION RELIEF VALVE ASSY (P/N 691-21a) - New Surplus
P/N: 691-21a
Category: Valves & Actuators
This product requires a custom quote. Please contact our sales team for pricing information or submit an RFQ (Request for Quote).
Available Inventory
| Condition | Stock |
|---|---|
| New Surplus | 1 Available |
Product Description
The 691-21a is a suction relief valve assembly for aircraft vacuum systems. This spring-loaded component admits air into the system to limit suction pressure to a preset value, protecting vacuum pumps and gyro instruments from over-pressure damage. Installed in the suction manifold, it maintains consistent regulator setpoint during normal operation.
Installation and adjustment must follow the aircraft maintenance manual specifications. Verify compatibility with your aircraft's Illustrated Parts Catalog before installation.
Please note: Product descriptions are provided for informational purposes. Always refer to your aircraft's Illustrated Parts Catalog (IPC) to verify part compatibility and specifications.
Frequently Asked Questions
What is the SUCTION RELIEF VALVE ASSY (P/N 691-21a)?
The 691-21a is a suction relief valve assembly for aircraft vacuum systems. This spring-loaded component admits air into the system to limit suction pressure to a preset value, protecting vacuum pumps and gyro instruments from over-pressure damage.
What hydraulic fluid type is the 691-21a compatible with?
Hydraulic component compatibility depends on the aircraft system design. Common aviation hydraulic fluids include MIL-PRF-5606 (mineral-based), MIL-PRF-83282 (synthetic), and Skydrol (phosphate ester). Verify the SUCTION RELIEF VALVE ASSY against your aircraft maintenance manual for fluid compatibility.
Does the 691-21a come pressure-tested and certified?
Overhauled and repaired hydraulic components are pressure-tested per manufacturer specifications and include 8130-3 documentation. The SUCTION RELIEF VALVE ASSY is available in: New Surplus. Contact us for test documentation on your selected condition.
What is the turnaround time for hydraulic component orders?
In-stock hydraulic components ship same business day before 3 PM EST. We provide 24/7 AOG support at (904) 998-9101 for urgent hydraulic system needs. RFQ submissions are typically quoted within 24 hours.
Related Valves & Actuators
- VALVE – P/N 50930
- VALVE – P/N 945V100
- VALVE ASSY,SHUTTLE – P/N d74326-401
- VALVE – P/N 100-43927M1
- VALVE RELF – P/N 0870069-20
- TRIM ACTUATOR – P/N 45as61014-1
- ACTUATOR ASSEM – P/N 96-526014-15
- FLOW DIVIDER & DUMP VALVE – P/N 3118512-01
- SEAT VALVE – P/N LW16475
- SEAT VALVE – P/N lw10077
- VALVE – P/N vrm20213-1e
- VALVE FUEL – P/N 9851067-4