TM 55-4920-428-13
(2) The valve is a four-way two-position spool type with an electrical receptacle on the solenoid.
The solenoid piston directly operates the valve spool. The valve cannot be energized open until the
manual button is pulled up, actuating a switch. Manually pressing the button electrically deenergizes
the solenoid, closing the valve.
h. Filter. (71, Fig. 6-5.)
(1) The filter is a 5-micron assembly with a visual contamination indicator. The filter is mounted
below the panel, near the right side of the test unit. The filter includes a contamination indicator,
which can be reset, and a bypass. The indicator and filter mounting screws are accessible from the top
of the panel.
(2) The filter is 6.299 in. wide port to port, 6.102 in. deep and 11.89 in. high.
(3) The filter head is ductile iron with threaded connections. The bowl is a forged steel screw-in
type. The element is a corrosion-resistant metal-fiber assembly that can withstand a differential
pressure of 4500 psi. Element nominal flow rate is 7.7 gpm.
i. HIGH PRESS SHUTOFF Valve.
(See fig. 1-3.)
(1) The shutoff valve is near the HIGH PRESS gage. The valve control knob is above the panel.
The body is accessible from below the panel.
(2) The valve is a needle type which has a slotted spindle for accurate flow control. The control
knob includes a 0 to 9 scale on the lower side to indicate fractions of a turn and a full turns indicator on
the top of the knob. A set screw in the side of the knob can be used to lock the shutoff valve.
(3) The valve mounting is an inline type. Port openings are ¼ in. with standard machine thread.
The valve body is steel. Seals have a pressure rating of 5000 psi.
j. CASE VENT LINE PRESS Valve.
(See fig. 1-3.)
(1) The CASE VENT LINE PRESS shutoff valve is near the LOW PRESS gage. The valve control
knob is above the panel. The body is accessible from below the panel.
(2) The valve has a round spindle for accurate flow control. The control knob includes a 0 to 9
scale on the lower side to indicate fractions of a turn and a full turns indicator on the top of the knob. A
set screw in the side of the knob can be used to lock the shutoff valve.
(3) The valve mounting is an inline type. Port openings are ¼ in. with standard machine thread.
The valve body is steel. Seals have a pressure rating of 5000 psi.
k. RETURN BACK PRESS Valve.
(See fig. 1-3.)
(1) The RETURN BACK PRESS valve is near the LOW PRESS gage. The control knob is above
the panel. The valve body is accessible from below the panel.
(2) The valve is a needle type which has a slotted spindle for accurate flow control. The control
knob includes a 0 to 9 scale on the lower side to indicate fractions of a turn and a full turns indicator on
the top of the knob. A set screw in the side of the knob can be used to lock the shutoff valve.
(3) The valve mounting is an inline type. Port openings are ¼ in. with standard machine thread.
The valve body is steel. Seals have a pressure rating of 5000 psi.
l. RETURN SHUTOFF VALVE. (See fig. 1-3.)
(1) The shutoff valve is near the ILCA manifold. The control knob is above the panel. The valve
body is accessible from below the panel.
(2) The valve has a round spindle for accurate flow control. The control knob includes a 0 to 9
scale on the lower side to indicate fractions of a turn and a full turns indicator on the top of the knob. A
set screw in the side of the knob can be used to lock the shutoff valve.
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