We study opening transient responses of a self-sustainable poppet valve, which is usually
used for the main oxidizer shut-off valve of liquid rocket engines. In order to perform
numerical analysis, a pneumatic supply system was simulated as an orifice with a diameter
of 3.2 mm and the equations of motion of valve moving part were derived. For the validation
of the study, a comparison of numerical predictions and experimental results has been done.
As one of the practical applications of this study, the employment of an orifice in a high …

Opening characteristics of a main oxidizer shut-off valve at different valve inlet pressures
have been experimentally investigated. The pilot pressure at the moment of the valve
opening increases linearly with increasing the valve inlet pressure and the increased pilot
pressure reduces the valve travel time. As the pilot pressure increases at the moment of
valve opening, the time to start opening the valve is delayed resulting in increasing the valve
opening time. With the increment of the valve inlet pressure, the valve opening time is mainly …