A-A-52502 Valve Assembly, Poppet, Hull Drain-Vehicular, 3 InchThis CID covers requirements for a 3 inch (in.) hull drain poppet valve assembly, which is used to drain water out of vehicles. The valve assembly consists of a valve, seat, spring, and knob.

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A-A-52502B

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Former MS

�part number

AA52502-4

MS51349-1

Former MS

�part number

AA52502-5

MS51350-1

SPRING SPECIFICATION

DIAMETER OF WIRE	0.095
DIAMETER OF COIL (INSIDE)	0.91 � 0.03
FREE LENGTH	2.360 � 0.020
ACTIVE COILS	6.25
TOTAL COILS	7.50
DIRECTION OF HELIX	OPTIONAL
LOAD AT COMPRESSED LENGTH OF 1.03	16 � 1.5 POUNDS (LB)
SPRING RATE	12 LB/IN
SOLID LENGTH	0.81 MAX
TYPE OF ENDS	CLOSED ENDS GROUND
SQUARENESS OF ENDS IN FREE POSITION WITHIN 3�

NOTES:

1. Dimensions are in inches. Unless otherwise specified, tolerances are:

a. Knob tolerances are: on 2 decimals � 0.015, on 3 decimals � 0.005, angles � 030�.

b. Spring tolerances are: on 2 decimals � 0.031, on 3 decimals � 0.020.

2. All knob machined surfaces shall be 125 microinches. All burrs and sharp edges shall be removed.

FIGURE 4. Knob and spring.