MIL-DTL-3155 Valve, Temperature-Regulating Ventilation Heater, Steam Control, Naval Shipboard UseThis specification covers thermostatic-controlled steam valves for temperature regulation of shipboard ventilation heaters. These valves are of the self-operated type, requiring no separate power source such as electricity or compressed air.

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MIL-DTL-3155D(SH)

3.7 Onboard repair parts. When specified (see 6.2), onboard repair parts shall be furnished in accordance with

TABLE V. Onboard repair parts.

Quantity

Repair parts

Total number of identical parts installed per ship

1-10

11-20

21-30

31-40

41-50

Over 50

Thermostats

Seats and poppets

Manual shut-off elements and

operating wrenches, if required

3.8 Identification and marking.

3.8.1 Identification plate. Each valve shall be provided with a metal identification plate, attached to an exposed

position that normally will not be covered by insulation. The identification plate shall contain the following

information:

Item name (thermostat type)

Valve size and number

Federal stock number

Component identification plate

Manufacturer s name

Manufacturer s address

3.8.2 Body marking. The valve size, manufacturer s name, and the direction of flow indicated by an arrow or

similar means shall be cast or otherwise permanently marked on the valve body.

3.9 Workmanship. Temperature-regulating valves shall be free from defects that affect their appearance or

their operation. Castings shall be clean, sound, and free from blow holes, hard spots, porosity, cracks, and other

injurious defects. They shall be smooth and well-cleaned, both inside and outside, and all fins and roughness shall

be removed.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:

Qualification inspection (see 4.2).

Conformance inspection (see 4.3).

4.2 Qualification inspection. Qualification inspection shall be performed on each model temperature-regulating

valve at a laboratory acceptable to the Naval Sea Systems Command (NAVSEA). This inspection shall include the

examination of 4.4 and tests of 4.5, as specified in table VI.

4.3 Conformance inspection. Conformance inspection shall include the examination of 4.4 and the tests of

4.5.3 through 4.5.5, as specified in table VI.

4.3.1 Sampling for conformance inspection.

4.3.1.1 Lot. All temperature-regulating valves of the same size and model and with the same type of

thermostat(s) offered for delivery at one time shall be considered a lot.