MIL-PRF-12125H
3.2.1.2 Recycled, recovered, or environmentally preferable materials. Recycled,
recovered, or environmentally preferable materials shall be used to the maximum extent possible
provided that the material meets or exceeds the operational and maintenance requirements, and
promotes economically advantageous life cycle costs (see 4.4.1 and 4.4.2).
3.3 Design and construction. Unless otherwise specified herein, the valve shall conform
to the manufacturer s design and construction (see 4.4.1 and 4.4.2). As a minimum the following
overall requirements shall be incorporated:
a. Quick opening.
b. Sliding-spindle gate with:
1. Solid wedge.
2. Single or double disk; Actuated by a lever mechanism.
3. Lever mechanism shall lock the valve open in any desired position.
c. Area of flow through the valve shall not be less than the area of the nominal pipe size
of the valve.
d. Exception to c; for valves with seat rings having lugs for insertion and removal of
rings, the area shall not be reduced by more than 30 percent (%).
e. The disk shall not jam and internal parts shall not be damaged by rapid and/or
forceful lever operation.
3.3.1 Valve body and bonnet. The valve body and bonnet shall be cast iron conforming
to ASTM A126, class B or C. The joint between the body and bonnet shall be flanged, gasketed,
and bolted. Saddle-type U-bolts shall not be used to secure the bonnet. Yokes shall be cast
integrally with the bonnet or flange connected to the bonnet. Disk guides shall be cast integrally
with the body and formed to support disks in all positions (see 4.4.1 and 4.4.2).
3.3.2 External working parts. External working parts shall be malleable iron conforming
to ASTM A47/A47M, ductile iron conforming to ASTM A536, grade 65-45-12, or cupola
malleable iron conforming to ASTM A197/A197M (see 4.4.1 and 4.4.2).
3.3.3 Seat rings. Seat rings shall be bronze conforming to either ASTM B61 or
ASTM B62. The seat rings shall be secured in the body by threaded connections to permit
removal and replacement of the rings (see 4.4.1 and 4.4.2).
3.3.4 Disks. Disks shall be bronze conforming to either ASTM B61 or ASTM B62, or
shall consist of a cast-iron disk, faced with bronze disk rings. The disk rings shall be bronze
conforming to ASTM B61 or ASTM B62, and shall be permanently secured to the disk by
rolling into accurately machined, dovetailed slots, or by equivalent means. Disks shall be
equipped with integral guides to mate with guides cast in the body (see 4.4.1 and 4.4.2).
3.3.5 Stems. Stems shall be any copper alloy listed in table IV (see 4.4.1 and 4.4.2):
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