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Valves, filters and couplings

Check, relief, solenoid and ball valves, hydraulic and fuel filters, and quick disconnect couplings.

4in-depth pages
24specifications cited
35primary sources linked
8kwords of reference

What we source

Check, relief, solenoid and ball valves, hydraulic and fuel filters, and quick disconnect couplings. Bought to the specification and revision on your drawing, from the manufacturer or authorized distribution, with lot traceability.

What to send

  • Part numbers exactly as on the drawing or parts list
  • Specification revision where one applies
  • Quantity, need date and ship-to
  • Approved manufacturers or alternates you accept

Paperwork we flow down

  • Certificate of conformance
  • Manufacturer certs and lot or date codes
  • Material certs and DFARS specialty metals where they apply
  • Cure or shelf-life dates on age-sensitive items

Send a parts list

Valves, filters and couplings 4

Fluid components

Check Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems

Buying check, relief and regulating valves for hydraulic, fuel and propellant systems: MIL-DTL-5523, NASA-STD-8719.17 retests, ASME UV marking and cleaning.

NASA-STD-8719.17MIL-DTL-5523AN6279MIL-V-5523D
Updated October 13, 2026Read
Fluid components

Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement

Buying hydraulic, fuel and gas filters: ISO 16889 beta ratios, ISO 4406 and AS4059 cleanliness codes, MIL-DTL-8815 elements, delta P indicators and swaps.

AS4059ISO 16889ISO 4406MIL-DTL-8815
Updated October 13, 2026Read
Fluid components

Self-Sealing Quick Disconnect Couplings: Specs, Flight and GSE Halves, Spillage and Testing

Buying self-sealing quick disconnects: MIL-DTL-25427 and AS25427, ISO 16028 flush face, spillage, flight versus GSE halves, dust caps and leak tests.

MIL-DTL-25427ISO 16028MIL-C-25427AS25427
Updated October 13, 2026Read
Fluid components

Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing

Buying solenoid and ball valves for GSE and test stands: PTFE, PCTFE and Vespel seats, ASTM G88, G94 and G63 oxygen guides, cryogenic service, helium leaks.

ASME B31.3NASA-STD-8719.17ASTM E499ASTM G88
Updated October 13, 2026Read
Quick reference

Specifications cited in this section

Each specification links to the page that explains what it governs and how to call it out. Always confirm the current revision on ASSIST or SAE before ordering.

SpecificationExplained on
ASTM G88Check Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems · Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement · Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing
ASTM G93Check Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems · Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement · Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing
NASA-STD-8719.17Check Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems · Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing
AN6279Check Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems
AS25427Self-Sealing Quick Disconnect Couplings: Specs, Flight and GSE Halves, Spillage and Testing
AS4059Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement
AS5440Self-Sealing Quick Disconnect Couplings: Specs, Flight and GSE Halves, Spillage and Testing
ASME B31.3Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing
ASTM E499Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing
ASTM G63Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing
ASTM G94Solenoid Valves and Ball Valves: Seats, Oxygen Compatibility, Cryogenic Service and Leak Testing
ISO 16028Self-Sealing Quick Disconnect Couplings: Specs, Flight and GSE Halves, Spillage and Testing
ISO 16889Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement
ISO 4406Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement
ISO 4572Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement
MIL-C-25427Self-Sealing Quick Disconnect Couplings: Specs, Flight and GSE Halves, Spillage and Testing
MIL-C-27487Self-Sealing Quick Disconnect Couplings: Specs, Flight and GSE Halves, Spillage and Testing
MIL-DTL-25427Self-Sealing Quick Disconnect Couplings: Specs, Flight and GSE Halves, Spillage and Testing
MIL-DTL-5523Check Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems
MIL-DTL-8815Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement
MIL-F-8815Hydraulic, Fuel and Gas Filters: Ratings, Cleanliness Classes and Element Replacement
MIL-V-5027Check Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems
MIL-V-5523DCheck Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems
MIL-V-5527ACheck Valves, Relief Valves and Pressure Regulators for Aerospace and Ground Systems
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