A-A-52429A(AT)
2.1.3 Metals. Metals shall be corrosion resistant or suitably treated to prevent corrosion. The
use of dissimilar metals, especially brass, copper, or steel in intimate metal to metal contact, shall
be avoided.
2.2 Design and construction. The solenoid valve shall be a direct acting, poppet style shutoff
valve, normally closed. The solenoid must be energized for the valve to remain open and allow
flow of fluid. The solenoid valve shall conform to Drawing 12265543 and other applicable
drawings, specifications and standards (see 5.2).
2.2.1 Operating fluid. The valve shall operate satisfactorily with hydraulic fluid (see 2.1.1).
2.3 Performance.
2.3.1 Proof pressure. With outlet port plugged, a pressure to the inlet port at a rate of
25,000 pounds per square inch (psi) per minute is applied until a pressure of 4,500 psi is
obtained. The valve shall withstand this pressure for a period of 2 minutes without permanent
deformation, rupture, or measurable external leakage.
2.3.2 Burst pressure. With outlet port plugged, a pressure to the inlet port at a rate of 25,000 psi
per minute is applied until a pressure of 7,500 psi is obtained. The valve shall withstand this
burst pressure for a period of 2 minutes without rupture of internal or external parts. Solenoid
valves subjected to this test shall be indelibly marked as damaged and shall not be delivered as
acceptable units.
2.3.3 Pull-in voltage. With the inlet at a maximum operating pressure and with the discharge
restricted to maintain rated flow, the valve shall actuate at any voltage applied to the solenoid
within a range between 18 and 30 volts direct current (Vdc).
2.3.4 Hold-in voltage. When energized with greater than 24 Vdc at maximum operating
pressure and the discharge restricted to maintain flow, the valve shall not release at any voltage
to the solenoid greater than 16 Vdc.
2.3.5 Coil current. With solenoid activated, the actuating current shall not exceed 0.625 ampere
(A) dc at 30 Vdc and at 77 degrees Fahrenheit (F).
2.3.6 Insulation resistance. With 500 Vdc applied between the coil terminals connected together
and the case, there shall be at least 100 megohms of resistance.
2.3.7 Dielectric withstanding voltage. The solenoid valve shall be capable of initially
withstanding 500 V root mean square (rms), 60 Hertz (Hz) for 1 minute between terminals tied
together and the case.
2
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business