MS21430 Valve, Check, Fuel And Air, Poppet Type, Zero, Leak

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MS21430B

REQUIREMENTS

Intended use. These low pressure check valves are suitable for use with hydrocarbon fuels, fuel vapors, and air.

Materials. Materials shall comply to requirements listed in the procurement specification, MIL-V-7899. Finish. Finish shall comply to requirements listed in the procurement specification, MIL-V-7899. Qualification. Check valves furnished under this specification shall be products which are qualified for

listing on qualified products list QPL-7899.

Locking of parts. Threaded parts shall be locked or safe-tied in accordance with National Aerospace Standard NASM 33540, "General Practices for Safety Wiring, Safety Cabling, and Cotter Pinning". Safety cable is allowed as an alternate to safety wire. Self-locking nuts shall not be used where loosening or disengagement could result in the nut or other parts entering the fuel system. The use of lockwashers or staking is prohibited.

Marking. The valve assembly shall be marked in accordance with MIL-STD-130, "Identification Marking of U.S. Military Property". The information should contain at least the following:

(1) Valve, Check.

(2) MS part number .

(3) Manufacturer's part number.

(4) Manufacturer's name or trade mark. Valve characteristic: See figure 1.

Valve classification: See table I.

Part or Identifying Number (PIN). The PIN is as follows:

MS21430 A 1 - 24

Dash number Style number Class letter Specification

Note: MIL-V-7899, "Valve, Check, Aircraft Fuel System", is the procurement specification. Reference documents. This document references the following:

MIL-V-7899, "Valve, Check, Aircraft Fuel System".

MIL-STD-130, "Identification Marking of U.S. Military Property".

NASM 33540, "Safety Wiring, Safety Cabling, for Cotter Pinning, General Practices for". SAE AS4395, "Fitting End, Flared, Tube Connection, Design Standard".

SAE AS4396, "Fitting End, Bulkhead, Flared, Tube Connection, Design Standard".

Changes from previous issue: Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.