MIL-DTL-52649C
f.
The primary action shall open the chamber in the volume specified by the
applicable size.
g.
The secondary action of the metering valve shall allow the container
valve to close to prevent continued flow, and at the same time, the
chamber outlet valve open, allowing the accumulated gas to propel the
charge of primer fuel through flexible copper or nylon tubing to the
atomizer.
3.5.6.1 Type III safety accessories. When specified (see 6.2), thermal controls to protect an engine
against ether injection after warm-up, and cranking controls to protect against hydraulic block by
excessive ether injection prior to cranking shall be furnished.
3.5.6.1.1 Temperature and pressure control combination. When applicable, safety controls shall be
furnished separately or in combination. For combination use, utilizing the pressure-sensitive valve (see
3.5.3.2), the thermal valve (see 3.5.3.3) shall be placed in the primer line between the metering device
and the oil-pressure sensor plug. This combination will inhibit injection of primer fuel when the oil
pressure of the engine is below 3 psi and when the block temperature of the engine rises above 50 °F (10
°C).
3.5.6.1.2 Cranking control. The cranking control shall be a pressure-sensitive valve. The valve shall
be normally closed, inhibiting the flow of primer fuel between the metering equipment and the air
induction system. The valve shall open at an oil pressure of 5 psi (34.5 kPa) and above, and will close
when oil pressure falls below 3 psi (20.7 kPa). The control design shall be such that primer fuel can only
be injected into the manifold when oil pressure due to cranking reaches 5 psi and above. The pressure
sensor shall have 1/8-inch pipe threads in accordance with FED-STD-H28.
3.5.6.1.3 Temperature control. When a thermal control is specified, either of the following types may
be furnished.
3.5.6.1.4 Engine coolant temperature control. The temperature control device shall receive thermal
energy from the cooling system. The device shall prevent the flow of ether when the coolant temperature
rises above the 100 °F (37.7 °C). Upon cooling, the device shall open to allow ether flow at 50 °F (10 °C)
or below engine coolant temperature.
3.5.6.1.5 Engine manifold temperature control. The temperature control device shall receive thermal
energy from the exhaust manifold. The device shall prevent the flow of ether when the exhaust manifold
temperature rises above the 140 °F (60 °C). Upon cooling, the device shall open to allow ether flow at 50
°F (10 °C) or below exhaust manifold temperature.
5
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